Siemens WL Series Instruction Manual

Low Voltage Circuit Breaker
Selection and application guide
Answers for industry.
WL Circuit Breakers
BCS Switchgear Inc.
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Safety Guidelines
This manual may contain notices which you should observe
to ensure your own personal safety, as well as to protect the
product and connected equipment. These notices are highlighted
in the manual by a warning triangle and are marked as follows
according to the level of danger.
This equipment contains hazardous voltages. Death, serious
personal injury, or property damage can result if safety
instructions are not followed. Only qualified personnel should
work on or around this equipment after becoming thoroughly
familiar with all warnings, safety notices, and maintenance
procedures contained herein. The successful and safe operation
of this equipment is dependent upon proper handling,
installation, operation and maintenance.
Danger
For the purpose of this manual and product labels, DANGER
indicates an imminently hazardous situation which, if not
avoided, will result in death or serious injury.
Warning
For the purpose of this manual and product labels, WARNING
indicates a potentially hazardous situation which, if not avoided,
could result in death or serious injury.
Caution
For the purpose of this manual and product labels, CAUTION
indicates a potentially hazardous situation which, if not avoided,
may result in minor or moderate injury.
Attention
Draws your attention to important information on the
product, handling the product, or to a particular part of
the documentation.
Qualified Personnel
For the purpose of this manual and product labels, a qualified
person is one who is familiar with the installation, construction
and operation of the equipment, and the hazards involved.
In addition, he or she has the following qualifications:
(a) Is trained and authorized to energize, de-energize, clear,
ground and tag circuits and equipment in accordance with
established safety practices.
(b) Is trained in the proper care and use of protective equipment,
such as rubber gloves, hard hat, safety glasses or face shield, flash
clothing, etc., in accordance with established safety practices.
(c) Is trained in rendering first aid.
Warning
This device and its components may only be used for the
applications described in the catalog or the technical descriptions,
and only in connection with devices or components from other
manufacturers which have been approved or recommended
by Siemens.
This product can only function correctly and safely if it is
transported, stored, set up, and installed correctly, and
operated and maintained as recommended.
Registered Trademarks
WinPM.Net is a registered trademark of Siemens Industry, Inc.
MODBUS® is a registered trademark of Schneider Automation,
Inc. Some other designations used in these documents are also
brands; the owner’s rights may be violated if they are used by
third parties for their own purposes. Excel and Internet Explorer
are registered trademarks of Microsoft Corporation. Java is a
registered trademark of Sun Microsystems. Netscape is a
registered trademark of AOL LLC.
Low Voltage Circuit Breaker
Guidelines
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Need Help? 888.599.0486

Features and benefits .......................................................... 2
Breaker assembly view ......................................................... 3
Draw-out cradle assembly view............................................. 4
Electronic trip units.......................................................5- 11
ETU Models and features ................................................. 6
ETU communication ........................................................ 7
ETU metering function..................................................... 8
Alarm parameters............................................................ 9
Extended relaying............................................................ 9
Function overview of the ETU...................................10 - 11
Breaker accessories and options ................................12 - 13
Ground fault module ......................................................12
Key lock-out ...................................................................12
Operation counter ..........................................................12
Auxiliary contacts...........................................................12
Breaker status sensor (BSS) .............................................12
Bell alarm contact and reset coil......................................13
Racking handle key lock ..................................................13
Breaker push-button lock-outs.........................................13
Close coil .......................................................................13
Spring charging handle lock............................................14
Rating plugs...................................................................14
Ready-to-close contact....................................................14
Shunt trip ......................................................................14
Shunt trip (continuous duty)...........................................14
Status contact ................................................................15
Spring charging motor....................................................15
Undervoltage release......................................................15
Cradle mounted options.............................................16 - 17
Secondary disconnect.....................................................16
Isolation shutters............................................................16
PROFIBUS or MODBUS communication.............................16
Dual key breaker locking .................................................16
Arc chute cover ..............................................................17
TOC (truck operated contacts).........................................17
MOC (mechanism operated contacts) ..............................17
Accessories ................................................................18 - 22
Communication and metering power supply ....................18
Handheld test device ......................................................18
Breaker display adapter (BDA) .........................................18
Mechanical breaker interlocks .........................................18
Metering current transformer – 3-phase window..............19
Metering current transformer – neutral phase..................19
Neutral current sensor – 4-wire residual ..........................20
Breaker door cover .........................................................20
Neutral current sensor ....................................................20
Door sealing frame .........................................................20
Breaker lifting device ......................................................21
CubicleBus modules........................................................21
Digital input module.......................................................21
ZSI module.....................................................................21
Analog output module....................................................22
Pre-assembled CubicleBus communication cables.............22
Fixed-mounted breaker front bus connectors ...................22
Primary lug connector kits ..............................................22
UL 489 Ratings ...........................................................23 - 24
Ratings for UL 489 ..............................................................23
Ratings for UL 489 (non-automatic) .....................................24
UL 489 assembled breaker catalog number................25 - 29
Interrupting rating, frame size, breaker type,
and frame rating ............................................................25
Rating plug ....................................................................26
Bell alarm, ready-to-close contacts ..................................27
Shunt trip ......................................................................27
Undervoltage release......................................................28
Charging motor, motor switch, operations counter...........28
Close coil, power metering and communications..............29
Breaker locks..................................................................29
Miscellaneous options ....................................................29
UL 489 assembled breaker catalog number
(non-automatic) .........................................................30 - 33
Breaker capacity, frame size, switch type
and frame rating ............................................................30
Ready-to-close auxiliary contacts.....................................30
Shunt trip ......................................................................31
Undervoltage release......................................................31
Charging motor, motor switch, operation counter ............32
Close coil, communications.............................................32
Switch locks ...................................................................33
Miscellaneous options ....................................................33
UL 489 accessories .....................................................34 - 35
External breaker accessories............................................34
Interrupting rating, frame size and frame rating...............35
UL 489 cradle catalog numbers .........................................36
UL 489 cradle accessories..................................................37
UL 1066 ratings ..........................................................38 - 39
Ratings for UL 1066 ............................................................38
Ratings for UL 1066 (non-automatic) ...................................39
UL 1066 assembled breaker catalog number..............40 - 44
Interrupting rating, frame size, breaker type and
frame rating...................................................................40
Rating plug ....................................................................41
Electronic trip units (ETU) ...............................................41
Bell alarm, auxiliary contacts...........................................42
Shunt trip ......................................................................42
Undervoltage release......................................................43
Charging motor, motor switch, operations counter...........43
Close coil power metering and communications...............44
Breaker locks..................................................................44
Miscellaneous options ....................................................44
UL 1066 non-automatic assembled breaker
catalog numbers ........................................................45 - 48
Breaker capacity, frame size, switch type, frame rating .....45
Auxiliary contacts...........................................................46
Shunt trip ......................................................................46
Undervoltage release......................................................46
Charging motor, motor switch, operations counter...........47
Close coil, communications.............................................47
Switch locks ...................................................................48
Miscellaneous options ....................................................48
UL 1066 breaker external accessories ...............................48
UL 1066 cradle catalog numbers .......................................49
UL 1066 accessories ..........................................................50
General wiring schematic ..........................................51 - 52
Ground fault setting..........................................................53
Metering voltage details ...................................................54
Fixed breaker dimensions ..........................................55 - 66
Frame size 1............................................................55 - 60
Frame size 2...................................................................61
Frame size 3............................................................62 - 66
Draw-out breaker dimensions ....................................67 - 78
Frame size 1............................................................67 - 71
Frame size 2............................................................72 - 75
Frame size 3............................................................76 - 78
Low Voltage Circuit Breaker
Table of contents
BCS Switchgear Inc.
Switchgear | Circuit Breakers | Parts | Tech Support
bcsswitchgear.com | 888.599.0486
Need Help? 888.599.0486

Businesses are becoming increasingly more intelligent about
the way they consume energy. Industrial and Commercial energy
consumers are continuously looking for practical and efficient
methods of measuring their energy usage while simultaneously
ensuring any possible downtime is minimized. At Siemens we
understand those needs and we have developed products and
solutions to help energy consumers achieve their goals.
One of our solutions begins with our world-class WL Circuit
Breakers. The WL line-up of breakers developed by Siemens
combines decades of patented circuit breaker protection
experience with the latest technology in circuit breaker
performance and communication.
A good example of our innovative technology is, Dynamic
Arc-Flash Sentry® (DAS). DAS is an option that allows users
the ability to automatically lower the down-stream available
fault current when facility personnel are nearby the electrical
equipment. Helping our customers provide a safer work-place
environment is an important part to our overall solutions.
Other valuable aspects that complement our solutions are the
WL circuit breaker’s ability to gather energy and environmental
data and send it to a central or remote monitoring network
system. You’ll find these capabilities and more when you take
a closer look at WL circuit breakers features within this guide.
WL Circuit Breaker Features and Benefits
• 3 frame sizes: Three frame sizes that cover a wide range of
continuous current ratings allow for flexible exchange of
breakers to other compartments and reducing the footprint
of the breaker enclosures
• Ready-to-close indication: Built-in check points of the
breakers mechanical operator provide an additional layer of
safety and external controls by inhibiting the breaker from
closing until certain conditions are satisfied
• 100% rating: All model breakers are designed for continuous
operation at their maximum current ratings without de-rating
the frame or use of forced air
• High-efficiency: Low loss of energy flowing through the
breaker reduces the operating costs
• Bi-directional feed: Top or bottom supply feed without any
hardware configuration changes.
• Rogowski coil sensing: Full range sensing without tap
terminals or exchanging sensors to match load change
requirements.
• Modular trip unit: Upgrading to a higher current rating,
adding ground fault, power monitoring or communication
is cost effective and expandable using separately
available modules.
• Common accessories: Interchangeable accessories makes up
grading easy and readily available
Practical solution
Applications
The WL line of power breakers are protecting electrical
distribution applications like waste water treatment, industrial
plants, hospitals, transportation systems and data centers just
to name a few. Yes, mission critical applications trust the Siemens
WL circuit breakers to operate safe and reliably. The compact
modular design provides higher power density in a section or
line-up of distribution gear. Components like spring-charging
motor, shunt trips, and trip units are common across the entire
line of breakers. That allows users the ability to stock fewer
spare parts or exchange options if necessary. Common options
and accessories also make learning how to order, maintain
and operate the WL much easier than most breakers on the
market today.
WL circuit breakers are manufactured and performance tested to
comply with UL489 and UL1066 standards for listed products.
UL489 classification type WL breakers are generally intended to
provide service entrance, feeder, and branch circuit protection in
accordance with UL489 Molded Case Circuit Breaker Standard
for Safety. Usage and installation of these breakers are normally
related to UL891 Switchboard or UL508 Industrial Equipment
Listed apparatus. Certain options and maintenance capability
may be limited to or not available as in the UL1066 Listed
breakers. For listing details refer to UL File# E231263
UL1066 classification type WL breakers are generally intended
to provide main and feeder circuit protection in accordance with
UL1066 Low-Voltage Power Circuit Breaker Standard for Safety.
These breakers were also performance tested to comply with
ANSI/IEEE C37.13, C37.16, C37.17, and C37.50. Throughout this
document any reference to UL1066 will also mean ANSI Certified.
Usage and installation of these class breakers are normally related
but not limited to UL1558 Switchgear (switchboards) listed
apparatus. Certain options and ratings may be limited to or not
available as in the UL489 Listed breakers. For listing details refer
to UL File #240124 and 240232.
Low Voltage Circuit Breaker
Introduction
2WL Circuit Breaker selection and application guide

3
WL Circuit Breaker selection and application guide
Low Voltage Circuit Breaker
1
2
3
4
6
Exterior breaker features
1. Sliding secondary control contacts
2. Padlock capable spring charging handle
3. Centralized operator panel
4. Integral racking handle with position indicator
5. Trip unit with full metering grade LCD
6. Low profile arc chutes
1
2
3
4
5
6
13
12
11
10
9
8
7
5
Interior breaker features
1. Remote closing coil
2. Dual shunt trip or UV release
3. Auxiliary switch
4. Automatic charging motor
5. Operation counter
6. Riveted breaker operating mechanism
7. Electronic trip unit (ETU)
8. Optional ground fault module with alarm
and trip functions
9. Interchangeable current rating plug
10. Breaker status sensor (BSS)
11. Bell alarm contact with remote reset
12. Shunt trip coil
13. Ready-to-close-contact

4WL Circuit Breaker selection and application guide
Low Voltage Circuit Breaker
Draw-out cradle assembly view
Cradle accessories
1. Mechanical interlock (not shown)
2. Isolation shutters
3. Auxiliary contact switches (MOC)
4. Dual key-lock location
5. Breaker position swiches (TOC)
6. Communication or secondary terminals
7. Optional arc chute cover (not shown)
Standard cradle
1. Stationary secondary disconnect
2. Primary disconnects
3. Cradle frame assembly for draw-out breakers
1
32
1
7
6
5
4
2
1
3

5
WL Circuit Breaker selection and application guide
Low Voltage Circuit Breaker
Electronic trip units
Electronic trip units (ETUs)
Power system protection is necessary to treat common types of
abnormal occurrences, such as overloads or faults that can lead
to electrical power system failure.
The methods for detecting and clearing such abnormalities
and restore to normal operation is an engineered technique.
Adequate protection requires constant measurements of certain
system quantities, such as voltages and currents, comparing
those system quantities, or some combination of the quantities,
to a threshold setting computed by a systems engineer and
set into an electronic trip unit like those available on the WL
breakers. It’s equally important for power system protection
to perform under normal operating conditions. If the above
thresholds are set too low the power may be interrupted
unnecessarily causing loss of productivity or safety provisions.
The WL circuit breaker offers a practical means of setting
power system protection through vast selectivity available in
its Electronic Trip Unit (ETU). WL ETUs have a wide range of
protective settings for implementing simple or complex
coordination schemes and configuring reliable system protection.
ETU enhanced features
• Extended Instantaneous Protection (EIP): Provides full
withstand capability and coordination up to the short-time
withstand rating regardless of the Instantaneous functional
setting. Without this feature de-rating of breakers could
reduce your system interrupt capacity by 20% or require
higher interrupt rated breakers.
• Dynamic Arc-Flash Sentry: Provides selective current reduction
settings to limit the amount of available energy downstream
from the WL breaker.
• Selectable I4t: ETU745 and 776 make it possible to
switchover from an I2t to an I4t inverse-time function for
overload protection. This selectivity increases optimization
of coordinated overload protection when overload fuse
protection is also required.
ETU basic functions
Long-time trip
The long-time delay adjustment is used to set the tripping delay
of the circuit breaker based on the magnitude of the overcurrent
condition (6 times lr). For example if the rating plug is 2000
amps and the long-time delay is set to 10 seconds, a fault current
of 12,000 amps (6 x 2000) will cause the breaker to trip after
10 seconds. Long-time is an inverse of I2t ramp function. This
means the higher the current, the shorter the time the circuit
breaker will remain closed. An Alarm LED indicator will flash
during the delay period and a separate “Trip L” indicator will turn
on if the breaker trips on long-time function.
Short-time trip
The short-time pickup adjustment is used to set the level of
high current the breaker will carry for a short period of time
without tripping. This adjustment is set in multiples of the
value of the rating plug (Ir). Together with the short-time delay,
this adjustment allows downstream breakers time to clear short
circuit faults without tripping upstream breakers. Short-time
delay is used to set the time interval the breaker will wait before
responding to the current value selected by short-time pickup.
There are two modes of operation: fixed and I2t. The I2t delay
has the characteristic of being inversely proportional to the
square of the magnitude of the current. This means higher
overcurrent conditions have shorter delays. An Alarm LED
indicator will flash during the delay period and a separate
“Trip S” indicator will turn on if the breaker trips on short-
time function.
Instantaneous trip
The instantaneous pickup adjustment is used to set the current
level at which the breaker will trip without an intentional time
delay. Non-delayed tripping as a result of severe overcurrent
minimizes potential damage to the electrical system and
equipment. This adjustment is set in multiples of Ir.
An instantaneous override (OFF) function is available. It is
normally set at the short-time rating of the respective breaker
frame size. This allows the breaker to ride through high fault
currents up to the breakers short-time withstand capability,
however, it is self protecting above the short-time withstand
value. An Alarm LED indicator will flash during the delay period
and a separate “Trip I” indicator will turn on if the breaker trips
on instantaneous function.
Ground fault
The ground fault pickup adjustment is used to set the level of
ground current at which circuit interruption will be initiated.
Together with ground fault delay, this adjustment allows
selective tripping between main and feeder or downstream
breakers.
The ground fault delay adjustment is used to set the time interval
(in seconds) the breaker will wait before responding once the
ground fault pickup level has been reached. The available ground
fault delay settings available are: inverse time (I2t) and/or fixed
delay. An optional alarm LED indicator will flash during the delay
period and a separate “Trip G” indicator will turn on if the breaker
trips on ground fault function.

6WL Circuit Breaker selection and application guide
Low Voltage Circuit Breaker
Electronic trip units (ETU)
ETU models and features
Features and characteristics ETU745 ETU748 ETU776
Long-time overcurrent protection (L) X X X
Short-time delayed overcurrent protection (S) X X X
Instantaneous overcurrent protection (I) X X
Neutral conductor protection (N) X X X
Ground fault protection (G) O O O
Selectable neutral protection X X X
Defeatable short-time protection X X
Defeatable instantaneous protection X X
Selectable thermal memory X X X
Zone selective interlocking X X X
Selectable I2t or fixed short-time delay X X X
Adjustable instantaneous pick-up X X X
Selectable I2t or I4t long-time delay X X X
Adjustable short-time delay and pick-up X X X
Selectable and adjustable neutral protection X X X
Dual protective setting capability X
Dynamic arc-flash sentry (DAS) X
Extended instantaneous protection (EIP) X X X
Parameterization by rotary switches X X
Parameterization by communication (absolute values) X
Parameterization by menu/keypad (absolute values) X
Remote parameterization of the alarm functions X
Remote parameterization of the relay functions X
Alphanumeric display O O X
Graphical display X
Power metering function O O O
Communication via PROFIBUS-DP O O O
Communication via the MODBUS O O O
Communication via the Ethernet (BDA) O O O
(X) = standard feature, (O) = optional feature

7
WL Circuit Breaker selection and application guide
ETU communication
The ETU uses a Siemens proprietary communication network
called CubicleBus. The CubicleBus network ensures all Siemens
devices are able to transmit data reliably and efficiently. The ETU
can not be connected directly any other network so the use of
converters are necessary to allow communication between the
ETU and the outside world. The WL has three types of converters
to allow communication between the ETU and computer type
equipment. The three converts are:
• PROFIBUS (COM15)
• ModBus (COM16)
• HTML or TCP/IP (BDA)
The WL PROFIBUS converter is model ‘COM15.’ The COM15 device
acts as an interface between the WL breaker and the information
environment. A joint device master file (GSD) can be used for
integrating WL circuit breakers in a PROFIBUS-DP network. The
advantage of this joint communication profile is that the
same software can be used for automation, monitoring and
control systems.
The WL ModBus converter is model ‘COM16’. The COM16 device
enables the WL breaker to be connected to any ModBus master
network. Universal ModBus mapping can be used to allow custom
monitoring and controls with a centralized monitoring system.
The Modbus port is configured for RS485 connectivity and
can easily be daisy-chained to several WL breakers to create a
serial-network suitable for connecting to a LAN or WAN network.
The WL HTML or TCP/IP converter is called ‘BDA.’ The BDA
is a microcomputer with an embedded Linux operating
system running a web server application. The HTML pages
and JAVA codes are stored internal to the BDA and can be
accessed with an external PC web browser. All of the viewable
web pages are stored in the BDA. The BDA communicates to the
ETU through a front connected ribbon-cable. The PC accesses
the BDA through an integral DB-9 serial port or an RJ45
Ethernet port.
All three converters require a 24VDC Class 2 power supply.
See External Accessories for more information on available
power supplies.
Low Voltage Circuit Breaker
Electronic trip unit (ETU)

8WL Circuit Breaker selection and application guide
Low Voltage Circuit Breaker
Electronic trip unit (ETU)
Power metering function
In addition to excellent protection capabilities, the WL ETU has
unparalleled power metering functionality. True RMS current
sensing for metering is obtained from the same current sensors
used for overload protection. ETU power metering can measure
the following:
Potential transformers (PTs) are required to step down the
supply voltage to a level that is suitable for local input
connection to the breaker. PTs must be wired to the secondary
connections of the breaker and configured for three-phase,
three-wire or three-phase, four-wire supply system. The
measured values can be sent to a central database for
future power analysis or consumption reports.
Event log
The event log is very extensive. Information regarding the
list of events can be found in the WL operation manual or
communication guide. Some of the event log categories are:
• Warnings
• Trip Logs
• Set-points
• Maintenance Detail
• CubicleBus Conditions
• Waveform Displays
Measured value Value range Accuracy
Currents Ia, Ib, Ic, In 30 ... 8000A ± 1%
Ground-fault current Ig (measure with external Gnd transformer) 100 ... 1200A ± 5%
Line-to-line voltages Vab, Vbc, Vca 80 ... 120% Vn ± 1%
Line-to-neutral voltages Van, Vbn, Vcn 80 ... 120% Vn ± 1%
Average value of phase-to-phase voltages V L-L AVG 80 ... 120% Vn ± 1%
Apparent power kVA per phase 13 ... 8000kVA ± 2%
Total apparent power KVA 13 ... 24000kVA ± 2%
Active power kW per phase -8000 ... 8000kW ± 3% (power factor > 0.6)
Total active power kWtotal -24000 ... 24000kVA ± 3% (power factor > 0.6)
Reactive power kvar -6400 ... 6400kvar ± 4% (power factor > 0.6)
Total reactive power kvar -20000 ... 20000kvar ± 4% (power factor > 0.6)
Power factor per phase -0.6 ... 1 ... 0.6 ± 0.04
Power factor total -0.6 ... 1 ... 0.6 ± 0.04
Demand of currents Ia, Ib, Ic 30 ... 8000A ± 1%
Average demand of 3-phase current 30 ... 8000A ± 1%
Demand kWD per phase 13 ... 8000kW ± 3% (power factor > 0.6)
kW demand 3-phase active power kWD total 13 ... 8000kW ± 3% (power factor > 0.6)
kVA demand kVA total 13 ... 8000kVA ± 2%
kVAR demand kVAR per phase 13 ... 8000kVA ± 2%
kVAR demand total -24000 ... 24000kvar ± 4% (power factor > 0.6)
kWhr imported 1 ... 10000MWh ± 2%
kWhr exported 1 ... 10000MWh ± 2%
kVARh imported 1 ... 10000Mvarh ± 4%
kVARh exported 1 ... 10000Mvarh ± 4%
Frequency 15 ... 440 Hz ± 0.1 Hz
Total harmonic distortions for current and voltage 2 ... 100% ± 3% from the meas. range up to the 29th harmonic
Phase unbalance for current and voltage 2 ... 150% ± 1%

9
WL Circuit Breaker selection and application guide
Alarm parameters
The metering function includes the following alarm
set-point functions:
Extended relaying
Protective relays included with the metering function can
monitor the following criteria and initiate a trip if the values
are exceeded.
Protective relay function ANSI device number Setting range Possible delay
Current unbalance 46 5 ... 50% 1 ...15 s
Total harmonic distortion - current 81 THDC 0 ... 50% 5 ...15 s
Voltage unbalance 47 5 ... 50% 1 ...15 s
Undervoltage 27 100 ... 1100V 1 ...15 s
Overvoltage 59 200 ... 1200V 1 ...15 s
Total harmonic distortion - voltage 81 THDV 0 ... 50% 5 ...15 s
Direction of phase rotation 47N
Active power in normal direction 32 1 ... 10000kW 1 ...15 s
Active power in reverse direction 32R 1 ... 10000kW 1 ...15 s
Under frequency 81U 40 ... 70 Hz 1 ...15 s
Over frequency 81O 40 ... 70 Hz 1 ...15 s
Alarm function Setting range Possible delay
Overcurrent 3 ... 10000A 0 ... 255 s
Overcurrent – ground fault 3 ... 10000A 0 ... 255 s
Overcurrent – N-conductor 3 ... 10000A 0 ... 255 s
Phase unbalance – current 5 ... 50% 0 ... 255 s
Demand – current 3 ... 10000A 0 ... 255 s
Total harmonic distortion - current 0 ... 50% 5 ... 255 s
Undervoltage 100...1200V 0 ... 255 s
Overvoltage 200...1200V 0 ... 255 s
Phase unbalance - voltage 5 ... 50% 0 ... 255 s
Total harmonic distortion - voltage 0 ... 50% 5 ... 255 s
Crest factor 0.01 ... 25.5% 0 ... 255 s
Form factor 0.01 ... 25.5% 0 ... 255 s
Active power in normal direction 1 ... 10000kW 0 ... 255 s
Active power in reverse direction 1 ... 10000kW 0 ... 255 s
Leading power factor -0.999 ... 1 0 ... 255 s
Lagging power factor -0.999 ... 1 0 ... 255 s
Demand - active power 1 ... 10000kW 0 ... 255 s
Apparent power 1 ... 10000kVA 0 ... 255 s
Reactive power in normal direction 1 ... 10000kvar 0 ... 255 s
Reactive power in reverse direction 1 ... 10000kvar 0 ... 255 s
Demand - apparent power 1 ... 10000kVA 0 ... 255 s
Demand - reactive power 1 ... 10000kvar 0 ... 255 s
Underfrequency 40 ... 70 Hz 0 ... 255 s
Overfrequency 40 ... 70 Hz 0 ... 255 s
Low Voltage Circuit Breaker
Electronic trip unit (ETU)

10 WL Circuit Breaker selection and application guide
Low Voltage Circuit Breaker
ETU function overview
G
Basic functions ETU745
Long-time overcurrent protection 3
Function can be switched ON/OFF –
Setting range IR= Inx ... 0.4, 0.45, 0.5, 0.55, 0.6,
0.65, 0.7, 0.8, 0.9, 1
0.9, 1
Switch-selectable overload protection
(I2t or I4t dependent function) 3
Setting range of time delay class tRat I2t
(seconds) 2, 3.5, 5.5, 8, 10,
14, 17, 21, 25, 30
Setting range of time delay tRat I4t
(seconds) 1, 2, 3, 4, 5
Thermal memory 3(via slide switch)
Phase loss sensitivity at tsd =20 ms (M)
Neutral protection 3
Function can be switched ON/OFF 3(via slide switch)
N-conductor setting range IN= Inx ... 0.5 ... 1
Short-time delayed overcurrent protection 3
Function can be switched ON/OFF 3(via rotary switch)
Setting range Isd = Inx ... 1.25, 1.5, 2, 2.5,
3, 4, 6, 8, 10, 12
Setting range of time delay tsd, fixed
(seconds) 0.02 (M), 0.1, 0.2,
0.3, 0.4, OFF
Switch-selectable short-time delay
short-circuit protection
(I2t dependent function) 3(via rotary switch)
Setting range of time delay Isd at I2t
(seconds) 0.1, 0.2, 0.3, 0.4
Zone Selective Interlocking (ZSI) function per CubicleBUS module
Instantaneous overcurrent protection 3
Function can be switched ON/OFF,
Extended Instantaneous Protection
is enabled when OFF 3(via rotary switch)
Setting range Ii= Inx ... 1.5, 2.2, 3, 4, 6, 8, 10, 12
0.8 x Icw = Max,
OFF=Icw=EIP 1
Ground fault protection 2O (field installable module)
Trip and alarm function 3
Detection of the ground fault current
by residual summing method 3
Detection of the ground fault current
by direct sensing method 3
Setting range of the Igfor trip A, B, C, D, E
Setting range of the Igfor alarm A, B, C, D, E
Setting range of the time delay tg
(seconds) 0.1, 0.2, 0.3, 0.4, 0.5
Switch-selectable
ground fault protection
(I2t / fixed) 3
Setting range time delay tgat I2t 0.4, 0., 0.3, 0.4, 0.5
ZSI ground function per CubicleBUS module
1 Extended Instantaneous Protection (EIP) allows the WL breaker to be applied at the withstand rating 3available
of the breaker with minus 0% tolerance; that means no instantaneous override whatsoever. EIP further – not available
enables the circuit breaker to be applied up to the full instantaneous rating of the breaker on systems o optional
where the available fault current exceeds the withstand rating.
2 Ground Fault Module cannot be removed after installation.

11
Low Voltage Circuit Breaker
Electronic trip units (ETU)
1 Extended Instantaneous Protection (EIP) allows the WL breaker to be applied at the withstand rating 3available
of the breaker with minus 0% tolerance; that means no instantaneous override whatsoever. EIP further – not available
enables the circuit breaker to be applied up to the full instantaneous rating of the breaker on systems o optional
where the available fault current exceeds the withstand rating.
2 Ground Fault Module cannot be removed after installation.
Notes:
M = indicates phase loss sensitivity is enabled. LT pick-up reduced 80% when phase unbalance > 50%. ST = 20 ms
Communications -= Setting the parameters of the trip unit via the Breaker Data Adapter, MODBUS or PROFIBUS.
Key pad = Direct input at the trip unit.
G
Basic functions ETU748 ETU776
Long-time overcurrent protection 33
Function can be switched ON/OFF – –
Setting range IR= Inx ... 0.4, 0.45, 0.5, 0.55, 0.... 1 (step: 1A)
0.6, 0.65, 0.7, 0.8,
0.9, 1
Switch-selectable overload protection
(I2t or I4t dependent function) 33
Setting range of time delay class tRat I2t
(seconds) 2, 3.5, 5.5, 8, 10, 2...30 (step; 0.1s)
14, 17, 21, 25, 30
Setting range of time delay tRat I4t
(seconds) 1, 2, 3, 4, 5 1...5 (step; 0.1s)
Thermal memory 3(via slide switch) 3(on/off via keypad or communications)
Phase loss sensitivity at tsd =20 ms (M) 3(on/off via keypad or communications)
Neutral protection – 3
Function can be switched ON/OFF 3(via slide switch) 3(on/off via keypad or communications)
N-conductor setting range IN= Inx ... 0.5 ... 1 OFF 0.5 ... 2 OFF
Short-time delayed overcurrent protection 33
Function can be switched ON/OFF 3(via rotary switch) 3(on/off via keypad or communications)
Setting range Isd = Inx ... 1.25, 1.5, 2, 2.5, 1.25... 0.9 x Icw = max
3, 4, 6, 8, 10, 12 (step: 10A)
Setting range of time delay tsd, fixed
(seconds) M, 0.1, 0.2, 0.3, 0.4 M, 0.08... 04, OFF (step: 0.001s)
Switch-selectable short-time delay
short-circuit protection
(I2t dependent function) 3(via rotary switch) 3(via keypad or communications)
Setting range of time delay Isd at I2t
(seconds) 0.1, 0.2, 0.3, 0.4 0.1... 0.4 (step 0.001s)
Zone Selective Interlocking (ZSI) function per CubicleBUS module per CubicleBUS module
Instantaneous overcurrent protection 33
Function can be switched ON/OFF,
Extended Instantaneous Protection
is enabled when OFF – 3(via keypad or communications)
Setting range Ii= In x ... Ii= Icw = EIP 1.5 x In 0.8 x Ics = OFF = Icw = EIP
Ground fault protection 2O (field installable module) O (field installable module)
Trip and alarm function 33(via keypad or communications)
Detection of the ground fault current
by residual summing method 33
Detection of the ground fault current
by direct sensing method 33
Setting range of the Igfor trip A, B, C, D, E A... E (step: 1A)
Setting range of the Igfor alarm A, B, C, D, E A... E (step: 1A)
Setting range of the time delay tg
(seconds) 0.1, 0.2, 0.3, 0.4, 0.5 0.1...0.5 (step: 0.001s)
Switch-selectable
ground fault protection
(I2t / fixed) 33
Setting range time delay tgat I2t 0.1, 0.2, 0.3, 0.4, 0.5 0.1...0.5 (step: 0.001s)
ZSI ground function per CubicleBUS module per CubicleBUS module
WL Circuit Breaker selection and application guide

12
Ground fault module
The ground fault module (GFM) is used to detect current
flowing through the grounding conductors which may present
a hazardous condition. The module can be field added to an
ETU745 or higher model as an upgrade but can’t be removed
once installed. Residual sensing by phase vector summation or
direct sensing can be selected on the module or via the setup
of the ETU776. Ground fault modules may be ordered as
alarm only or as alarm and trip. Alarm will provide a visual and
communication notification. Alarm and trip model will trip the
breaker in addition to alarm notification.
Key lock-out
To lock the WL breaker in the “Open” position an optional key-
lock can be installed on the breaker. The key cylinder and lock-out
assembly is mounted on the breaker and accessible via a knock-
out on the breaker front cover, after installation is complete. The
key is removable only when the breaker is locked open. Keys can
be ordered as keyed-alike for a Superior or Kirk key cylinder type.
If a custom key is required, order the key lock provision only.
Lock must be obtained by others.
Operation counter
For monitoring the number of breaker operations (open and
close) a numerical operations counter is available. This counter
is only suitable for breakers equipped with the spring-charging
motor option. The counter mounts to the motor assembly and
will register manual and electrical breaker operations. Counter
is non-resettable up to 100,000 operations. Counter ships with
available pre-service operations for field setting
to zero.
WL Circuit Breaker selection and application guide
Low Voltage Circuit Breaker
Breaker accessories and options
Auxiliary contacts
Auxiliary contacts can be used to provide interlocking control
or remote indication of the breakers main contact position (open
or closed breaker). The Normally Open (NO) contacts are open
when the breakers main contacts are open. The Normally Closed
(NC) contacts are closed when the breakers main contacts are
open. The contacts are wired individually to the secondary
disconnects for user connectivity. See breaker wiring diagram
for supply terminal locations.
Breaker status sensor (BSS)
BSS is an integrated circuit device that measures the internal
breaker temperature, monitors breaker main contact position
(open or closed), bell alarm status, shunt trip status, breaker
ready-to-close and closing spring charged status. All status
conditions and information is transmitted through the CubicleBus
network as real-time data. A Com16 (Modbus), COM15 (PROFIBUS)
or a BDA (breaker display adapter) accessory must be used to
export the BSS CubicleBus data to external computer or monitoring
equipment. Only one sensor per breaker is available. See breaker
wiring diagram for supply terminal locations.
Characteristics table
Available Contact Configurations 2NO and 2NC or 4NO and 4NC
AC Operation Voltage 240VAC 50/60Hz
Continuous Current 10A
Making Current 30A
Breaking Current 3A
DC Operation Voltage 24, 125, 250VDC
Continuous Current 5A
Making Current 1.1A @ 24 or 125VDC, .55A @250VDC
Breaking Current 1.1A @ 24 or 125VDC, .55A @250VDC
Characteristics table
Operating Voltage 24VDC
Peak Inrush Current 110mA
Max. Continuous Current 40mA
Ambient Operation Temperature -25 to 70C
Breaker mounted options

13
WL Circuit Breaker selection and application guide
Bell alarm contact and reset coil
The bell alarm contacts are mechanically activated by the trip
unit solenoid. If a breaker trip condition occurs, the bell alarm
form-C contacts will change state closing or opening a user circuit
wired to the secondary terminal block. The contacts can be locally
reset to their original position by manually resetting the trip unit
solenoid or through the use of a reset coil which can be energized
remotely. See breaker wiring diagram for supply terminal locations.
Non-automatic (manual) reset trip units can not be used with the
reset coil option.
Characteristics table
Low Voltage Circuit Breaker
Breaker accessories and options
Close coil
To remotely close the WL breaker, a close coil may be used with a
momentary electrical source. Only one close coil specific to the
supply voltage can be used per breaker. Charging springs must be
charged and breaker open prior to use of close coil. See breaker
wiring diagram for supply terminal location.
Breaker push button lock-outs
If conscious use of the breaker close or open push button is
required. A finger or hand tool shroud option can be added to
the breaker front cover. Shrouds may be used in combination
or like configuration.
If push button lock-out is required. Transparent padlock covers
for unauthorized or mechanical lockout can be installed in lieu
of the shroud option. Two padlocks may be used with a latch
diameter of 3/8 inch maximum (padlocks by others).
Racking handle key lock
A draw-out breaker can be key locked (optional) or padlocked
(standard not shown) in three racking positions; connect,
test or disconnect. Key lock cylinders are available in Kirk or
Superior types and uniquely keyed.
Characteristics table
120VAC Range 104 - 127VAC
Close Coil 240VAC Range 208 - 254
AC Operation Power Consumption 120W for 50ms (5% duty cycle)
min. closing time 50ms from point of signal
24VDC 14 - 28VDC
48VDC 28 - 56VDC
Close Coil 125VDC 70 - 140VDC
DC Operation 250VDC 140 - 280VDC
Power Consumption 120W for 50ms (5% duty cycle)
min. closing time 50ms from point of signal
Available Contact Configurations 1 Form-C Contact
Remote Voltage 240VAC 50/60Hz
Reset Coil Continuous Current 5A
AC Operation Making Current 8A
Breaking Current 5A
Remote Voltage 24, 48,125 or 250VDC
Reset Coil Continuous Current 5A
DC Operation Making Current .4A @ 24, 48,125VDC, .2A @250VDC
Breaking Current .4A @ 24, 48,125VDC, .2A @250VDC

14 WL Circuit Breaker selection and application guide
Spring charging handle lock
An optional padlock provision to prevent manual charging of the
closing springs can be installed on the breaker front cover. This
provision does not prevent electric charging of the closing springs
and the breaker can be mechanically closed if the closing spring
is charged prior to padlocking the charging handle. One padlock
may be used with a latch diameter of 3/8 inch maximum (padlock
by others).
Ready-to-close contact
In addition to the standard “ready-to-close” visual indicator on
the WL breaker, an optional contact can be added to remotely
monitor the ready-to-close conditions. Closing is ready if all of
the following conditions are true:
• closing spring-charged
• breaker main contacts are open
• mechanical lock-outs disabled
• racking handle seated in stored position
• electrical lock-outs disabled
Low Voltage Circuit Breaker
Breaker accessories and options
Characteristics table
Trip coil 120VAC range 104 - 127VAC
AC operation 240VAC range 208 - 254VAC
Power consumption 120W for 50ms (5% duty cycle)
Min. closing time 50ms from point of signal
Trip coil 24VDC range 14 - 28VDC
DC operation 48VDC range 28 - 56VDC
125VDC range 70 - 140VDC
250VDC range 140 - 280DVC
Power consumption 120W for 50ms (5% duty cycle)
Min. closing time 50ms from point of signal
Shunt trip (continuous duty)
The continuous duty shunt trip opens the circuit breaker instantly
when energized by a remote power source, similar to the shunt
trip. The continuous duty shunt trip is suitable for 100% duty cycle
and can hold the WL breaker open during an electrical or manual
“close breaker” attempt (i.e. lock-out). The continuous duty trip
may be used in conjunction with a standard shunt trip solenoid
for dual control. Not available for use with UL1066 Listed breakers.
Shunt trip 120 - 240 VAC range 85 - 110% of nominal
(interlock 24 - 250VDC range 70 - 126% or nominal
coil) Power consumption 15W / 15VA
Min. shunt trip actuation 60 ms
Opening time of breaker 80 ms
Smallest fuse protection rating 1A
Characteristics table
Ready-to- Voltage 125-240VAC, 125 -250VDC
close Continuous current 3A
contact Making current .4A @24-125VDC, 5A @120-240VAC
Breaking current .2A @24-125VDC, 3A @120-240VAC
Shunt trip
The shunt trip opens the circuit breaker instantly when energized
by a remote power source. An auxiliary contact is wired in series
with the shunt trip to limit the current after the trip (open)
condition exists. Two shunt trip coils may be installed in a breaker
if dual supply sources or control circuits are required. An optional
status contact may be selected with the shunt trip to provide a
signaling condition that the shunt trip has been activated. Status
contact not available with communication option. Status
condition is sent via communication instead of contact.
Rating plugs
The rating plug is selected as required to limit the downstream
load current (In). Use of a rating plug that exceeds the breaker
frame rating will result in a trip unit error and will trip the breaker
automatically. Rating plugs are field interchangeable.
Characteristics table

15
WL Circuit Breaker selection and application guide
Characteristics table
Spring-charging motor
The spring charging motor is used to automatically charge the
breakers closing spring so the breaker is suitable for closing on
command. Motor charging is typically used for remote breaker
operation or as an alternative to local manual charging. The
motor assembly can be easily installed in the field and includes
an automatic cut-off switch which disconnects the current upon
full charge of the closing spring mechanism.
Characteristics table
Spring- 120 - 240VAC range 85 -110% of nominal
charging 24 - 240VDC range 70 - 126% of nominal
motor Power consumption 110W
Max. charging time 10 seconds
Fuse protection rating 24-60V 6A, 120-240V 3A
(slow-blow)
Signaling Voltage 127 - 240VAX, 24 - 125VDC
contact Continuous current 3A
Making current 1A @24 - 125DVC, 5A @120 - 240VAC
Breaking current 1A @24 - 125DVC, 3A @120 - 240VAC
Characteristics table
Undervoltage Operating values 85 - 110% breaker can be closed,
release UVR 35 - 70% breaker will open
120 - 240VAC
Coil tolerance 85 - 110% of nominal
24 - 250VDC
Coil tolerance 85 - 126% of nominal
Supply voltage 120, 240VAC or 24, 48, 125, 250VDC
Power consumption 200VA inrush/ 5VA continuous
(same in Watts for DC)
Opening time
of breaker 200 ms
UVR w/o time delay
(dual setting) 80 ms or 200ms
UVR with time delay
(adjustable) for reset) 0.2 to 3.2 sec. (<101 ms
Undervoltage release
In the event of loss or low level control circuit voltage, an
undervoltage release may be used to automatically open
the circuit breaker. To prevent nuisance breaker openings
from temporary voltage dips, a separate adjustable time-
delay undervoltage release is also available.
Status contact
A status contact is a mechanical switch that is suitable for
monitoring an undervoltage trip or shut trip coil position.
The signal may be wired to the secondary contacts of the
breaker for customer connections or wired to the Breaker
Status Sensor (BSS) if communications is installed on the
breaker. Contact is 1NO configured.
Low Voltage Circuit Breaker
Breaker accessories and options

16 WL Circuit Breaker selection and application guide
Characteristics table
Wire connection type Number of wires and sizes
Secondary Screw compression 1 x 14AWG or 2 x 16AWG
disconnects Tension spring compression 2 x 14AWG
Ring lug terminal 2 x 14AWG or 2 x 16AWG
or 1 x 10AWG
PROFIBUS or MODBUS communication
PROFIBUS or MODBUS communication requires a COM15
or COM16 converter to retain WL data in temporary buffers
for transmission to external PCs or PLC monitoring systems.
External communication connection to either module is
through a DB-9F connector.
Characteristics table
Operating voltage 24VDC
Peak inrush current 280mA
Max. continuous current 125mA
Ambient temperature -25 to 70ºC
Low Voltage Circuit Breaker
Cradle accessories and options
Dual key breaker locking
For draw-out breakers, a cradle mounted breaker lockout device
can be used with single or dual key cylinders. One key cylinder
holds the key captive when the breaker is closed and releases the
key when the breaker is opened. The other key cylinder locks the
breaker from being removed from its breaker compartment. The
key is removable when racked into the disconnect position. Key
cylinders can be keyed alike or unique for interlocking with other
breakers in the distribution system. Superior or Kirk Key lock types
are available. Custom keys must be supplied by others.
The following items are available for WL cradles. Items are
described to highlight the functional characteristics of these
factory installed cradle options.
Secondary disconnects
Secondary disconnects are used to interconnect external breaker
control and signaling circuitry to the WL breakers factory wired
circuitry. Three types of external connection terminals are
available. 1. Screw compression for bare wire, 2. Tension spring
compression for bare wire and, 3. Captive screw connections for
Siemens type ring lugs (WL10RL).
Isolation shutters
When removing a draw-out breaker from its connected position
the primary contacts become exposed and more accessible to
personnel in the breaker compartment. Isolation shutters reduce
that accessibility to the primary terminals by automatically
closing the access ports to the primary terminals while the
breaker is in the test or disconnect positions. After removal
of the breaker from its compartment, the shutters may be
padlocked to inhibit manual shutter opening while breaker is
not in the compartment.

17
WL Circuit Breaker selection and application guide
Arc chute cover
The arc chute cover is available for isolating enclosure material
or parts located above the circuit breaker where heat and
exhaust gases may exit from the breakers arc chutes. Arc chute
covers are not available for fixed mounted breakers and limited
to select draw-out breaker types.
TOC (truck operated contacts)
For draw-out breaker applications a TOC device is available to
provide remote indication of the circuit breakers primary and
secondary contact connections (racking positions). When the
breaker is racked into a connected, test or disconnected
position, it activates TOC switches for external user circuits.
Low Voltage Circuit Breaker
Cradle accessories and options
MOC (mechanism operated contacts)
If additional auxiliary contacts are needed beyond what is
supplied on the breaker, a MOC switch may be used to obtain
an additional 4A and 4B set of contacts. Contacts can be
operated in the test and connect position or the connect
only position.
Characteristics table
MCC contact configurations 4NO and 4NC
AC operation Voltage 240VAC 50/60Hz
Continuous current 10A
Making current 30A
Breaking current 3A
DC operation Voltage 24, 125, 250VDC
Making current 1.1A @ 24 or 125VDC,
.55A @250VDC
Breaking current 1.1A @ 24 or 125VDC,
55A @250VDC
TOC Switch Breaker disconnected = primary Breaker in test = primary Breaker connected = primary
and secondary contacts contacts disconnected and and secondary contacts
are disconnected secondary contacts connected are connected
Switch Option 1 1 form C contacts 1 form C contacts 1 form C contacts
Switch Option 2 1 form C contacts 2 form C contacts 3 form C contacts
Switch Option 3 0 form C contacts 0 form C contacts 6 form C contacts
AC voltage 120, 240VAC
AC continuous current 10A
TOC Contact Ratings AC making/breaking current 6A@120V, 3A@240VAC
DC voltage 24, 48, 125, 250VDC
DC continuous current 6A, 1A, 1A
DC making/breaking current 6A, 0.22A, 0.11A

18 WL Circuit Breaker selection and application guide
Breaker display adapter (BDA)
The BDA can be used to read or modify the breaker ETU and
Cubiclebus parameters using a laptop, pocketPC or remote
desktop PC. All circuit breakers in a system can be parameterized
individually using one BDA with similar or different parameters.
No software is required as the embedded software interface
is through a PC browser. Connectivity to a PC or network can
be serial (RS232) or Ethernet (TCI/IP) addressed. A separate
120VAC in/ 24VDC out power supply is included. If the breaker
ETU is energized with 24VDC control power the BDA can be
powered through the interconnected ribbon cable. Order part
number WLBDAP
Low Voltage Circuit Breaker
Accessories
Handheld test device
To test the WL breakers ETU trip functions we offer a hand-held
tester that checks:
• Current Sensor Winding
• Long-time Function
• Short-time Function
• Instantaneous Function
• Neutral and Ground Fault Function
• General ETU system check
During a test the device will electrically trip the circuit breaker
simulating a full function test of the ETU and the trip actuator.
Cables for 120VAC power supply and ETU connection is included
with the tester. Order part number WLTS
Communication and metering power supply
For WL devices that require a 24VDC input we offer the Siemens
SITOP power supply. The SITOP power supply is a class 2 rated
devices suitable for supporting loads of 2.5 or 3.8 amps. DIN rail
mounting provision and compression wire connections included.
For loads of 2.5A maximum order part number WLSITOP25 or
WLSITOP1 for 3.8A maximum loads.
Mechanical breaker interlocks
A mutual mechanical interlocking option is available for fixed
or draw-out breakers. Interlocking is managed through cable
connections between two or three adjacent breakers 6 meters
apart or less. Lock kit includes 2.0 meter interlocking cable and
mechanism for mounting to a single breaker.
For fixed breaker frame size 1 order part number WLNTLKF1
For fixed breaker frame size 2 or 3,
order part number WLNTLKF23
For draw-out brearker frame size 1, 2, or 3,
order part number WLNTLK
For cable extensions, order part number
3.0 meter WLNTLWRE3
4.5 meter WLNTLWRE4
6.0 meter WLNTLWRE5