Cutler-Hammer ATVISPE32000XSU User manual

I.B. ATS-SD02
Effective 5/98 Replaces I.B. ATS-SDO1 dated October, 1996
Cutler-Hammer
Instructions for Cutler-Hammer Drawout
Transfer Switch and Bypass Isolation Switch

I.B. ATS-SD02 Page iii
Effective 5/98
All possible contingencies which may arise during installation, operation or maintenance, and all details and
variations of this equipment do not purport to be covered by these instructions. If further information is
desired by purchaser regarding his particular installation, operation or maintenance of particular equipment,
contact a Cutler-Hammer representative.
READ AND UNDERSTAND THE INSTRUCTIONS
CONTAINED HEREINAFTER BEFORE ATTEMPTING
TO UNPACK, ASSEMBLE, OPERATE OR MAINTAIN
THIS EQUIPMENT.
HAZARDOUS VOLTAGES ARE PRESENT INSIDE
TRANSFER SWITCH ENCLOSURES THAT CAN
CAUSE DEATH OR SEVERE PERSONAL INJURY.
FOLLOW PROPER INSTALLATION, OPERATION
AND MAINTENANCE PROCEDURES TO AVOID
THESE VOLTAGES.
!
WARNING TRANSFER SWITCH EQUIPMENT COVERED BY
THIS INSTRUCTION BOOK IS DESIGNED AND TEST-
ED TO OPERATE WITHIN ITS NAMEPLATE RAT-
INGS. OPERATION OUTSIDE OF THESE RATINGS
MAY CAUSE THE EQUIPMENT TO FAIL RESULTING
IN DEATH, SERIOUS BODILY INJURY AND/OR
PROPERTY DAMAGE. ALL RESPONSIBLE PERSON-
NEL SHOULD LOCATE THE DOOR MOUNTED
EQUIPMENT NAMEPLATE AND BE FAMILIAR WITH
THE INFORMATION PROVIDED ON THE NAME-
PLATE. A TYPICAL EQUIPMENT NAMEPLATE IS
SHOWN IN FIGURE 1.
Figure 1 Typical Automatic Transfer Switch Equipment Nameplate
Cutler-Hammer
AutomaticTransfer Switch
ECat No: ATVISPE32000XSU 1/98
GO No: 1 of 1
Item: 1
Poles: 3 Amps: 2000 Volt: 480
Phase: 3 Hertz: 60 Wire: 4

I.B. ATS-SD02
Page iv
Effective 5/98
TABLE OF CONTENTS
PAGE
SECTION 1: INTRODUCTION
1.1 Preliminary Comments and Safety Precautions..................................................................................................1
1.1.1 Warranty and Liability Information..........................................................................................................1
1.1.2 Safety Precautions .................................................................................................................................1
1.2 General Information.............................................................................................................................................1
1.2.1 Transfer Switch Types............................................................................................................................2
1.2.2 Design Configuration..............................................................................................................................2
1.3 Transfer Switch Catalog Number Identification...................................................................................................4
SECTION 2: RECEIVING, HANDLING AND STORAGE
2.1 Receiving.............................................................................................................................................................6
2.2 Handling..............................................................................................................................................................6
2.3 Storage ...............................................................................................................................................................6
SECTION 3: EQUIPMENT DESCRIPTION
3.1 General ...............................................................................................................................................................7
3.2 Power Panel........................................................................................................................................................7
3.2.1 Main Contacts ........................................................................................................................................7
3.2.2 Switch Interlocks ....................................................................................................................................8
3.2.3 Drawout Interlocks..................................................................................................................................8
3.2.4 Transfer Mechanism...............................................................................................................................9
3.2.5 Drawout Mechanism...............................................................................................................................9
3.3 Voltage Selection Panel......................................................................................................................................9
3.4 Logic Panel........................................................................................................................................................10
3.5 Neutrals.............................................................................................................................................................10
3.6 Options (Non-Logic Panel)................................................................................................................................10
3.7 Enclosure .........................................................................................................................................................12
3.8 Standards..........................................................................................................................................................12
SECTION 4: INSTALLATION AND WIRING
4.1 General .............................................................................................................................................................14
4.2 Mounting Location.............................................................................................................................................14
4.3 Mounting Procedure..........................................................................................................................................14
4.4 Power Cable Connections.................................................................................................................................17
4.5 Voltage Selection Adjustment ..........................................................................................................................18
4.6 Mounting Switching Device in the Drawout Mechanism....................................................................................18
4.7 Wiring .............................................................................................................................................................20
4.7.1 Engine Start Connection ......................................................................................................................20
SECTION 5: OPERATION
5.1 General .............................................................................................................................................................21
5.2 Automatic Transfer Switch ................................................................................................................................21

I.B. ATS-SD02 Page v
Effective 5/98
PAGE
SECTION 6: DRAWOUT MECHANISM
6.1 Drawout Interlock ..............................................................................................................................................23
6.2 Switch Position..................................................................................................................................................23
6.3 Rotation on the Drawout....................................................................................................................................23
6.4 Operational Check for Drawout Mechanism......................................................................................................24
SECTION 7: OPERATION OF BYPASS ISOLATION TRANSFER SWITCH
7.1 Operator Panel..................................................................................................................................................25
7.2 Automatic Operation..........................................................................................................................................25
7.3 Bypassing the Transfer Switch..........................................................................................................................26
7.3.1 Normal to Normal Bypass ....................................................................................................................26
7.3.2 Emergency to Emergency Bypass.......................................................................................................26
7.3.3 Normal to Emergency Bypass..............................................................................................................29
7.3.4 Emergency to Normal Bypass..............................................................................................................29
7.4 Manual Operation when in Bypass Mode..........................................................................................................30
7.4.1 Normal Bypass to Emergency Bypass.................................................................................................30
7.4.2 Emergency Bypass to Normal Bypass.................................................................................................30
SECTION 8: TESTING AND PROBLEM SOLVING
8.1 Testing .............................................................................................................................................................31
8.2 Problem Solving................................................................................................................................................31
8.2.1 Transfer Switch Appears Inoperative...................................................................................................31
8.2.2 Transfer Switch will not Automatically Transfer to Normal...................................................................32
8.2.3 Transfer Switch will not Automatically Transfer to Emergency ............................................................32
8.2.4 Transfer Switch will not Automatically Recharge Switches..................................................................32
SECTION 9: MAINTENANCE
9.1 Introduction........................................................................................................................................................33
9.2 Procedures........................................................................................................................................................33

I.B. ATS-SD02
Page vi
Effective 5/98
LIST OF FIGURES
Figure Title Page
1-1 Typical Load Transfer Switch (circuit breaker type) Schematic.................................................................2
1-2 Typical Bypass Isolation Switch.................................................................................................................3
1-3 Typical Bypass Isolation Switch Schematic...............................................................................................3
1-4 Typical Drawout Transfer Switch with Deadfront Attached........................................................................4
3-1 Typical Power Panel..................................................................................................................................7
3-2 Insulated Case Circuit Breaker..................................................................................................................7
3-3 Side View and Rear View of Power Panel.................................................................................................8
3-4 Drawout Mechanism..................................................................................................................................9
3-5 Voltage Selection Panel ............................................................................................................................9
3-6 IQ Transfer...............................................................................................................................................10
3-7 Typical Solid State Logic .........................................................................................................................10
3-8 Neutral Connection..................................................................................................................................11
3-9 Charger Mounting Dimensions in Inches (mm) .......................................................................................12
3-10 Typical Switch Enclosure.........................................................................................................................13
4-1 Enclosed Drawout Transfer Switch (NEMA 1 Enclosure)........................................................................15
4-2 Enclosed Bypass Isolation Transfer Switch (NEMA 1 Enclosure)...........................................................16
4-3 Side View and Rear View of Power Panel...............................................................................................18
4-4 Drawout Stationary..................................................................................................................................20
4-5 Seismic Tested and Approved Product Mounting Instructions................................................................19
4-6 Secondary Control Block Contact Opening.............................................................................................20
4-7 Correct Placement...................................................................................................................................20
5-1 Pumping Handle Charges Stored Energy Mechanism............................................................................21
5-2 Close Switch by Pushing Close Button....................................................................................................21
6-1 Drawout with Socket Wrench...................................................................................................................23
6-2 Drawout Rotated Out for Inspection ........................................................................................................23
6-3 Drawout Returned to Upright Position.....................................................................................................24
7-1 Bypass Isolation Switch...........................................................................................................................25
7-2a Transfer from Normal Switching Device to Normal Bypass Switching Device, Steps 1-4.......................27
7-2b Transfer from Normal Switching Device to Normal Bypass Switching Device, Steps 5-8.......................28
LIST OF TABLES
Table Title Page
1.1 Withstand Ratings......................................................................................................................................3
1.2 Transfer Switch Catalog Number Explanation...........................................................................................5
3.1 Transfer Switch Equipment Enclosures...................................................................................................13
4.1 Wire Size for Power Cable Connections..................................................................................................18
9.1 Periodic Maintenance Procedures...........................................................................................................34

I.B. ATS-SD02 Page 1
Effective 5/98
SECTION 1: INTRODUCTION
1.1 PRELIMINARY COMMENTS AND SAFETY
PRECAUTIONS
This technical document is intended to cover most
aspects associated with the installation, application,
operation and maintenance of transfer switch equipment
with ratings from 600 through 4000 amperes, except for
the specific logic used to control the equipment. It is pro-
vided as a guide for authorized and qualified personnel
only. Please refer to the specific WARNING and CAU-
TION in Section 1.1.2 before proceeding. If further infor-
mation is required by the purchaser regarding a particu-
lar installation, application or maintenance activity, a
Cutler-Hammer representative should be contacted. For
information associated with the control, refer to the sep-
arate instruction book pertaining to the logic package
installed in the switch.
1.1.1 WARRANTY AND LIABILITY INFORMATION
No warranties, expressed or implied, including war-
ranties of fitness for a particular purpose of merchant-
ability, or warranties arising from course of dealing or
usage of trade, are made regarding the information, rec-
ommendations and descriptions contained herein. In no
event will Cutler-Hammer be responsible to the purchas-
er or user in contract, in tort (including negligence), strict
liability or otherwise for any special, indirect, incidental
or consequential damage or loss whatsoever, including
but not limited to damage or loss of use of equipment,
plant or power system, cost of capital, loss of power,
additional expenses in the use of existing power facili-
ties, or claims against the purchaser or user by its cus-
tomers resulting from the use of the information and
descriptions contained herein.
1.1.2 SAFETY PRECAUTIONS
All safety codes, safety standards and/or regulations
must be strictly observed in the installation, operation
and maintenance of this device.
THE WARNINGS AND CAUTIONS INCLUDED AS
PART OF THE PROCEDURAL STEPS IN THIS DOCU-
MENT ARE FOR PERSONNEL SAFETY AND PRO-
TECTION OF EQUIPMENT FROM DAMAGE. AN
EXAMPLE OF A TYPICAL WARNING LABEL HEAD-
ING IS SHOWN ABOVE TO FAMILIARIZE PERSON-
NEL WITH THE STYLE OF PRESENTATION. THIS
WILL HELP TO INSURE THAT PERSONNEL ARE
ALERT TO WARNINGS, WHICH APPEAR THROUGH-
OUT THE DOCUMENT. IN ADDITION, CAUTIONS
ARE ALL UPPER CASE AND BOLDFACE.
COMPLETELY READ AND UNDERSTAND THE MATE-
RIAL PRESENTED IN THIS DOCUMENT BEFORE
ATTEMPTING INSTALLATION, OPERATION OR
APPLICATION OF THE EQUIPMENT. IN ADDITION,
ONLY QUALIFIED PERSONS SHOULD BE PERMIT-
TED TO PERFORM ANY WORK ASSOCIATED WITH
THE EQUIPMENT. ANY WIRING INSTRUCTIONS PRE-
SENTED IN THIS DOCUMENT MUST BE FOLLOWED
PRECISELY. FAILURE TO DO SO COULD CAUSE
PERMANENT EQUIPMENT DAMAGE.
1.2 GENERAL INFORMATION
Transfer switches are used to protect critical electrical
loads against loss of power. The load’s normal power
source is backed up by a secondary (emergency) power
source. A transfer switch is connected to both the nor-
mal and emergency power sources and supplies the
load with power from one of these two sources. In the
event that power is lost from the normal power source,
the transfer switch transfers the load to the secondary
(emergency) power source. Transfer can be automatic
or manual, depending upon the type of transfer switch
equipment being used. Once normal power is restored,
the load is automatically or manually transferred back to
the normal power source, again depending upon the
type of transfer equipment being used (Figure 1-1).
In automatic transfer switch equipment, the switch’s
intelligence system initiates the transfer when normal
power fails or falls below a preset voltage. If the emer-
gency power source is a standby generator, the transfer
switch initiates generator starting and transfers to the
emergency power source when sufficient generator volt-
age is available. When normal power is restored, the
transfer switch automatically transfers back and initiates
engine shutdown. In the event the normal power source
fails and the emergency power source does not appear,
the automatic transfer switch remains connected to the
normal power source until the emergency power source
does appear. Conversely, if connected to the emer-
gency power source and the emergency power source
fails while the normal power source is still unavailable,
the automatic transfer switch remains connected to the
emergency power source.
!
WARNING
!
CAUTION

I.B. ATS-SD02
Page 2
Effective 5/98
1.2.1 TRANSFER SWITCH TYPES
In general, there are four types of basic transfer switch
equipment:
Automatic Transfer Switch
Automatic transfer switches automatically perform the
transfer function. They consist of three basic elements:
(1) Main contacts to connect and disconnect the load
to and from the source of power.
(2) Intelligence/supervisory circuits to constantly moni-
tor the condition of the power sources and thus pro-
vide the intelligence necessary for the switch and
related circuit operation.
(3) A transfer mechanism to effect the transfer of the
main contacts from source to source.
Basic Transfer Switch
The basic transfer switch is designed for use with cus-
tomer furnished logic. It is similar in design to the auto-
matic version except the intelligence circuit (logic panel)
and voltage selection panel are omitted. All automatic
sensing devices, relays or solid state devices are the
customer’s responsibility.
Non-Automatic Transfer Switch (Manually Operated)
Non-Automatic transfer switches provide the main con-
tacts and the transfer mechanism to effect the transfer
of the main contacts from source to source. Transfer of
power, however, is accomplished by true hand opera-
tion (not power assisted) of the transfer switch. This
switch is similar to the basic switch in that an intelli-
gence circuit and a motor driven mechanism are not
part of the design.
Non-Automatic Transfer Switch (Electrically
Operated)
This transfer switch is similar to the Non-Automatic
Transfer Switch (Manually Operated) just described
except that an electrical operation feature is added. The
switch electrically transfers power when an appropriate
pushbutton on the front of the enclosure is pushed. If
necessary, the switch can also be operated manually.
In addition to the four basic switch types just discussed,
there is a specialized design called the Bypass
Isolation Transfer Switch.
Bypass Isolation Transfer Switch
The bypass isolation switch is designed for applications
where maintenance, inspection and testing must be per-
formed while maintaining continuous power to the load
(Figures 1-2 and 1-3). This is typically required in criti-
cal life support systems and standby power situations
calling for safe system maintenance with no power dis-
ruptions. Such a design allows for the quick removal of
the different switching devices for inspection, mainte-
nance or replacement.
The automatic transfer switch, non-automatic transfer
switch (electrically operated) and bypass isolation trans-
fer switch are the available types for the configuration
described in this manual.
Operation of the automatic transfer switch and the
bypass isolation switch are only discussed in this manu-
al (Sections 5 and 7 respectively).
1.2.2 DESIGN CONFIGURATION
The Cutler-Hammer transfer switch is a rugged, compact
design utilizing insulated case switches or insulated case
circuit breakers to transfer essential loads from one
power source to another (Figures 1-2 and 1-4). Switching
devices are interlocked to prevent both switching devices
from being closed at the same time. The versatile design,
in addition to standard transfer functions, offers an option-
al integral thermal and short circuit protection in either or
both switching devices.
Figure 1-1 Typical Load Transfer Switch (circuit break-
er type) Schematic
Normal
Source
Emergency
Source
Load

I.B. ATS-SD02 Page 3
Effective 5/98
Figure 1-3 Typical Bypass Isolation Switch Schematic
Figure 1-2 Typical Bypass Isolation Switch
Rating When Used with Upstream Circuit Breker Rating When Used with Upstream Fuse
Transfer Switch 240V 480V 600V Maximum Fuse 600V max.
Amp Rating (kA) (kA) (kA) Fuse Rating Type (kA)
800 100 100 85 2000 L 200
1000 100 100 85 2000 L 200
1200 100 100 85 2000 L 200
1600 100 100 85 3000 L 200
2000 100 100 85 3000 L 200
2500 100 100 85 4000 L 200
3000 100 100 85 4000 L 200
4000➀100 100 85 5000 L 200
Tested in accordance with UL1008.
Cutler-Hammer Drawout SPB Transfer Switch will coordinate with a power circuit breaker short time rating.
Contact factory for details
➀4000A rated switches not available in bypass isolation versions.
Table 1.1 Withstand Ratings

I.B. ATS-SD02
Page 4
Effective 5/98
Figure 1-4 Typical Drawout Transfer Switch with
Deadfront Attached
The switching devices are in a compact vertical arrange-
ment. The logic can be easily disconnected from the
switching device without disturbing critical connections.
The enclosure is free standing, and, by using the spe-
cially supplied cleats, the switch is seismic approved
(Option 42). The terminals are mounted in the rear of the
switch, permitting rear, top, bottom, or side cable or bus bar
entrance.
The switching devices have a high withstand
rating (Table 1.1). The high-speed, stored-energy switch-
ing mechanism guarantees a transfer time of
less than 5 cycles.
1.3 TRANSFER SWITCH CATALOG NUMBER
IDENTIFICATION
Transfer switch equipment catalog numbers provide a
significant amount of relevant information that pertains
to a particular piece of equipment. The catalog number
identification table (Table 1.2) provides the required
interpretation information. An example is offered to ini-
tially simplify the process.
Example: Catalog number (circled numbers correspond
to position headings in Table 1.2):
The catalog number ATVISPE31000XSU describes an
automatic transfer switch with the switching devices
mounted vertically in the enclosure. The intelligence
represented by the IQ Transfer is a microprocessor-
based logic package. The System Power Breaker (SPB)
is used as the switching device and is a 3-pole insulated
case switch for each source. The continuous current rat-
ing of this equipment is 1000 amperes and applicable at
480 VAC, 60Hz. The transfer switch equipment is
enclosed in a NEMA 1 enclosure and is UL listed.
➀to ➁➂ ➃➄
to ➅➆ ➇ ➈ to ➉
AT V I SP E 3 1000 X S U
12 13 14 15

I.B. ATS-SD02 Page 5
Effective 5/98
Positions 1-2 Position 3 Position 4 Positions 5-6
Switching Device
Configuration Orientation Control Panel Switching Device
Automatic Transfer Switch AT Vertical VIQ Transfer ISPB Systems Power Breaker SP
Bypass Isolation Transfer BI
Switch
Non-Automatic Transfer Switch NT Vertical VSolid State S
(Electrically Operated)
Basic Transfer Switch PP Vertical VNo Logic X
(Power Panel Only)
Position 7 Position 8 Positions 9-12 Position 13 Position 14 Position 15
Switching Device Number Ampere Voltage/ Enclosure
Arrangement of Poles Rating Frequency Type Listing
Drawout Insulated Case ETwo 20600 120VAC/60Hz ANo Enclosure KUL Listed U
Switches both Sources Three 30800 208VAC/60Hz BType 1 S
Four 41000 600VAC/60Hz EType 3R R➀
Drawout Insulated Case F1200 220VAC/50 or 60Hz GType 4 L
Breakers both Sources 1600 380VAC/50Hz HType 4X D
2000 600VAC/50Hz KType 12 J
Drawout Insulated Case G2500 230VAC/50Hz M
Breaker Normal Source, 3000 401VAC/50Hz N
Insulated Switch 4000 415VAC/50Hz O
Emergency Source 240VAC/60Hz W
480VAC/60Hz X
Drawout Insulated Case H365VAC/50Hz Z
Switch Normal Source,
Insulated Breaker
Emergency Source
Table 1.2 Transfer Switch Catalog Number Explanation
➀ Not available in bypass isolation (BU) versions.

I.B. ATS-SD02
Page 6
Effective 5/98
SECTION 2: RECEIVING, HANDLING AND
STORAGE
2.1 RECEIVING
Every effort is made to insure that transfer switch equip-
ment arrives at its destination undamaged and ready for
installation. Crating and packing is designed to protect
internal components as well as the enclosure. Transfer
switch enclosures are skid mounted and suited for fork
lift movement. Care should be exercised, however, to
protect the equipment from impact at all times. Do not
remove protective packaging until the equipment is
ready for installation.
When transfer switch equipment reaches its destination,
the customer should inspect the shipping container for
any obvious signs of rough handling and/or external
damage incurred during the transportation phase.
Record any external and internal damage observed for
reporting to the transportation carrier and Cutler-
Hammer, once a thorough inspection is completed. All
claims should be as specific as possible and include
shop order and general order numbers.
A shipping label is affixed to the top of the shipping con-
tainer which includes a variety of equipment and cus-
tomer information, such as General Order Number
(GO#) and Catalog Number (Cat#). Make certain that
this information matches other shipping paper informa-
tion.
Each transfer switch enclosure is bolted to a rigid wood-
en pallet. The pallet is open at two ends for movement
by a fork lift. The shipment is secured and further pro-
tected with shrink wrap. Do not discard the packing
material until the equipment is ready for installation.
A plastic bag of documents will be found within the
enclosure, usually attached to the inside of the door.
Important documents, such as test reports, wiring dia-
grams, appropriate instruction leaflets and a warranty
registration card, are enclosed within the bag and
should be filed in a safe place.
2.2 HANDLING
As previously mentioned, transfer switch equipment is
packaged for fork lift movement. Protect the equipment
from impact at all times and do not double stack. Once
the equipment is in the installation location and ready to
be installed, packaging material can be removed. Once
the enclosure is unbolted from the wooden pallet, the
equipment can be installed using the lifting provision
located on the top of the structure. Be careful not to
damage the top or bottom enclosure mounting flanges.
Refer to Section 4 of this manual for specific installation
instructions.
2.3 STORAGE
Although well packaged, this equipment is not suitable
for storage outdoors. The equipment warranty will not
be applicable if there is evidence of outdoor storage. If
the equipment is to be stored indoors for any period of
time, it should be stored with its protective packaging
material in place. Protect the equipment at all times from
excessive moisture, construction dirt, corrosive condi-
tions and other contaminants. It is strongly suggested
that the package protected equipment be stored in a cli-
mate controlled environment of -20° to 85° with a rela-
tive humidity of 80% or less. Do not, under any circum-
stances, stack other equipment on top of a transfer
switch equipment enclosure, whether packaged or not.

I.B. ATS-SD02 Page 7
Effective 5/98
SECTION 3: EQUIPMENT DESCRIPTION
3.1 GENERAL
This Cutler-Hammer transfer switch equipment is avail-
able in three different configurations:
• Automatic Transfer Switch
• Non-Automatic Transfer Switch (Electrically Operated)
• Bypass Isolation Transfer Switch
Refer to Section 1 for a discussion of the four types.
Each transfer switch is usually supplied in an enclosure,
although unmounted sub-assemblies can be supplied for
mounting by the customer. Since the enclosed automatic
transfer switch encompasses all transfer switch equip-
ment possibilities, it is the only specific type that will be
discussed in this section.
The enclosed automatic transfer switch consists of three
basic panels interconnected through connector plugs
and mounted in an enclosure:
• Power Panel
• Voltage Selection Panel
• Logic Panel
- IQ Transfer
- Solid State
The components comprising the three panels are installed
in accordance with the specific requirements of the circuit
being controlled. Each transfer switch is, therefore, tailor-
made to a specific application.
3.2 POWER PANEL
The power panel consists of a means for making load,
power, and neutral connections. The main contacts and
the transfer mechanism are all on one steel frame
(Figures 3-1). The actual power connections are shown
in Figure 3-3.
3.2.1 MAIN CONTACTS
The main contacts connect and disconnect the load to
and from the different power sources. High withstand
insulated case switches are the main contacts for the
Normal and Emergency power sources in standard,
unmodified automatic transfer switches. Optional inte-
gral thermal and short circuit protection in either or both
switching devices is available (Figure 3-2 and Section
3.6). These continuous duty devices are rated for all
Figure 3-1 Typical Power Panel Figure 3-2 Insulated Case Circuit Breaker

I.B. ATS-SD02
Page 8
Effective 5/98
classes of loads. In addition, they have high dielectric
strength, heavy-duty switching and withstand capabili-
ties, and high interrupting capacity.
3.2.2 SWITCH INTERLOCKS
Cutler-Hammer transfer switches are mechanically and
electrically interlocked to prevent the two sets of main
contacts from being closed simultaneously.
3.2.3 DRAWOUT INTERLOCKS
All switching devices are mechanically interlocked to the
drawout mechanism to ensure that the switching device
is always open when connecting or disconnecting it from
the line and load stabs.
LIFTING THE PADLOCK LATCH WHILE ATTEMPT-
ING TO RACK THE SWITCH IN OR OUT WHEN THE
SWITCH CONTACTS ARE CLOSED WILL CAUSE
THE SWITCH TO OPEN.
The switching device will close only in the DISCON-
NECT, TEST, and CONNECT positions. The switching
device will not close in the WITHDRAW position.
Figure 3-3 Side View and Rear View of Power Panel
Normal
Power
Connectors
Load
Connections
Emergency
Power
Connections
!
CAUTION
Mechanical
Interlock
Cables

I.B. ATS-SD02 Page 9
Effective 5/98
3.2.4 TRANSFER MECHANISM
The transfer switch uses Cutler-Hammer SPB-type insu-
lated case circuit breakers and insulated case switches
with a stored-energy mechanism (Figure 3-2). An elec-
trical operator automatically recharges the mechanism
after the switching device has been closed, and an indi-
cator on the switch shows whether it is in the OPEN or
CLOSED position and the status of the stored energy
mechanism.
The switching device is closed by energizing a solenoid
that releases the spring mechanism. A shunt trip will
open the switching device if energized.
3.2.5. DRAWOUT MECHANISM
The drawout mechanism is described in detail in Section
6 (Figure 3-4).
3.3 VOLTAGE SELECTION PANEL
The voltage selection panel is a multi-tap-enclosed
transformer mounted in the enclosure (Figure 3-5).
Seven front-accessible voltage taps from 208 to 600
volts AC satisfy most required application voltages. A
quick change capability from one voltage to another is
provided by a small disconnect plug.
Figure 3-5 Voltage Selection Panel
Figure 3-4 Drawout Mechanism

I.B. ATS-SD02
Page 10
Effective 5/98
3.4 LOGIC PANEL
The logic panel provides the intelligence and superviso-
ry circuits which constantly monitor the condition of both
normal and emergency power sources thus providing
the required intelligence for transfer operations (Figures
3-6 and 3-7). Different possibilities are available with
detailed information presented in separate documents:
• IQ Transfer Instruction Book
• Solid State Instruction Leaflet
3.5 NEUTRALS
All 2-pole and 3-pole transfer switches are equipped
with 100-percent-rated neutral connections (Figure 3-8).
Different lug configurations are available, Option 21A.
3.6 OPTIONS (NON-LOGIC PANEL)
Switch options, which are not part of the logic scheme,
are available to meet a variety of other application
requirements. Options are numbered with an associat-
ed description. More detailed selections that must be
made within a specific option are lettered. For available
options associated with the logic scheme, refer to the
specific logic document associated with the type of logic
selected.
Options are Underwriters Laboratories, Inc. listed,
except as noted, when supplied on UL Listed
Switches. If an option is selected that is Not UL
Listed, the switch Will Not Have A UL Label.
Not all options are available for all transfer switch
configurations. If in doubt, check Price List 29-920
for the availability of options for a specific transfer
switch design. The option numbers used here corre-
spond to the numbers used in the price list.
14. Relay Auxiliary Contact
The Normal power source relay is energized only when
the switch is in the Normal position and Normal power is
present. The Emergency power source relay is ener-
gized whenever the Emergency power source is present.
Figure 3-7 Typical Solid State Logic (Red Engine Start
Contact Identified by Pointer)
Figure 3-6 IQ Transfer

I.B. ATS-SD02 Page 11
Effective 5/98
C. Normal Power Source: Provides 2 NO and 2 NC
contacts
D. Emergency Power Source: Provides 2 NO and 2 NC
contacts
16. Power Switch with Integral Overcurrent
Protection
Use of this option can, in many cases, eliminate the need
for separate upstream overcurrent/short circuit protec-
tion, thus enabling code requirements to be met with a
device that takes up less space and requires less wiring.
B. Both Normal and Emergency Sides
E. Emergency side only
N. Normal side only
17C. High Withstand Rating
Increases withstand rating from 65 kA to 100 kA at 480
volts
18. IQ Metering
I. IQ Generator - Normal Only
J. IQ Generator - Emergency Only
K. IQ Generator - Both N&E (Selectable)
O. IQ Analyzer - Normal Only
P. IQ Analyzer - Emergency Only
Q. IQ Analyzer - Both N&E (Selectable)
R. DP-4000 - Normal Only
S. DP-4000 - Emergency Only
T. DP-4000 - Both N&E (Selectable)
20A. Rear Bus Connections
Solderless lugs are furnished as standard on all
enclosed and open units. Rear bus connections are only
available on open units.
21A. Non-Standard Terminals
(Refer to Cutler-Hammer)
24. Battery Charger
The trickle charge DC output is 12 or 24 volts. Units are
supplied in a separate wall mounted enclosure, and
have an automatic high-low charge rate.
C. 12 volt
D. 24 volt
When supplied, the battery charger is provided in a sep-
arate wall mounted enclosure (Figure 3-9). Separate
instructions and wiring information are provided with the
charger for installation purposes.
A separate 120 VAC control power supply is
required for the battery charger input. No connec-
tions between the transfer switch and battery charg-
er should be made.
NOTICE
Figure 3-8 Neutral Connection

I.B. ATS-SD02
Page 12
Effective 5/98
34. Extender Cable
An extender cable provides a means for extending the
distance between the power switching panel and the
logic panel. This allows for remote mounting of the logic
panel.
A. 48 inch (1.2 m)
B. 72 inch (1.8 m)
C. 96 inch (2.4 m)
D. 120 inch (3.0 m)
E. 144 inch (3.7 m)
Special lengths are available. Contact Cutler-Hammer.
37. Service Entrance
A. Provides transfer switch as suitable for service
equipment rating - A key operated selector switch
permits external, power operated service disconnec-
tion with external pilot light for disconnect indication,
also includes Option 16.
B. Same as A except includes ground fault protection.
41. Space Heater with Thermostat
A. 100 Watts
B. 200 Watts
C. 400 Watts
42. Seismic Withstand Capability
Provides transfer switch with seismic capability exceed-
ing the worst case Zone 4 required levels per both the
Uniform Building Code and the California Building
Code.
3.7 ENCLOSURE
The rugged steel switch enclosure is supplied with three
door hinges, regardless of enclosure size, to insure
proper support of the door and door mounted devices
(Figures 3-10, 4-1 and 4-2). The hinges have removable
hinge pins to facilitate door removal. The doors are sup-
plied as standard with a key lockable handle. Cable
entry holes are the customer’s responsibility.
The door is used to mount a variety of lights, switches
and pushbuttons, depending upon the options required
for a particular switch. All switch doors are supplied with
a heavy duty plastic accessory panel in place, whether
or not external devices are required. When lights, push-
buttons or switches are required, they are normally
mounted in the plastic door mounted panel. Models of
2500 amperes and higher have two doors (Figures 4-1
and 4-2).
Transfer switch enclosures and all internal steel mount-
ing plates, such as the power panel mounting plate, go
through a pre-treatment cleaning system prior to paint-
ing to insure a durable finish. Contact your local Cutler-
Hammer sales representative for touch-up paint infor-
mation.
The standard switch enclosure is NEMA Type 1 for gen-
eral indoor use (Table 3.1).
3.8 STANDARDS
Cutler-Hammer transfer switch equipment enclosed in a
NEMA 1 enclosure is listed for application by UL, and
are certified to meet Canadian Standards by
Underwriters Laboratories Inc. (CUL), except for Bypass
Isolation units. In addition, Cutler-Hammer Automatic
Transfer Switches are listed in File E38116 by
Underwriters Laboratories, Inc. under Standard UL
1008. This standard covers requirements for automatic
transfer switches intended for use in ordinary locations
to provide for lighting and power as follows:
a. In emergency systems, in accordance with articles
517 and 700 in the National Electrical Code,
ANSI/NFPA 70 and the National Fire Protection
Association No. 76A and/or
6.13 (156)
9.50 (241)
7.50 (191)
7.38 (187)
Figure 3-9 Charger Mounting Dimensions in Inches
(mm)

I.B. ATS-SD02 Page 13
Effective 5/98
b. In stand-by systems, in accordance with article 702
of the National Electrical Code and/or
c. In legally required stand-by systems in accordance
with article 701 of the National Electrical Code.
Cutler-Hammer Automatic Transfer Switches are avail-
able to meet NFPA 110 for emergency and stand-by
power systems, and NFPA 99 for health care facilities
when ordered with the appropriate options.
Since Cutler-Hammer Automatic Transfer Switches uti-
lize specially designed switches and/or circuit breakers
as the main power switching contacts, these devices
must also be listed under the additional UL Standards
489 and 1087. Underwriters Laboratories utilize two
basic types of listing programs: a) Label service b) Re-
examination. UL489 and UL1087 employ a label service
listing program which requires an extensive follow-up
testing program for listed devices. Standard UL1008 for
automatic transfer switches lists devices under the re-
examination program which only requires a continual
physical re-examination of the components used in the
product to insure consistency with the originally submit-
ted device. Follow-up testing is not required by UL1008.
Representative production samples of switches and cir-
cuit breakers used in Cutler-Hammer Automatic Transfer
Switches are subjected to a complete test program identi-
cal to the originally submitted devices on an ongoing peri-
odic basis per UL489 and UL1087. The frequency of such
a re-submittal can be as often as every quarter for a low
ampere device.
Figure 3-10 Typical Switch Enclosure
NEMA Design Protection
Type
1 Indoor Enclosed Equipment
3R Outdoor Rain, Ice Formation
4/4X Indoor/Outdoor Dust, Rain, Splashing, Water,
Corrosion Resistant
12 Indoor Dust, Dirt and Non-corrosive
Liquids
Table 3.1 Transfer Switch Equipment Enclosures

I.B. ATS-SD02
Page 14
Effective 5/98
SECTION 4: INSTALLATION ANDWIRING
4.1 GENERAL
Transfer switches are factory wired and tested.
Installation requires solidly mounting the enclosed unit
and connecting power cables and auxiliary pilot circuits.
Physical mounting procedures and power cable connec-
tions are covered in this section. All other required
wiring or electrical connection references are covered in
a separate Customer Wiring Diagrams packed with
the transfer switch. Locate the wiring booklet, review it,
and keep it readily available for reference purposes dur-
ing installation and testing. Once a transfer switch is
properly installed and wired, it should be mechanically
and electrically checked for proper installation and oper-
ation. The procedures for these initial mechanical and
electrical checks are outlined in Section 6 of this instruc-
tion manual.
BE CERTAIN THAT THE SOLID STEEL POWER
PANEL SHIELD IS PROPERLY INSTALLED BEFORE
TRANSFER SWITCH EQUIPMENT IS PUT INTO SER-
VICE. THE SHIELD PROVIDES PROTECTION FROM
DANGEROUS VOLTAGES AT THE LINE AND LOAD
TERMINALS WHEN THE EQUIPMENT IS IN OPERA-
TION. FAILURE TO DO SO COULD RESULT IN PER-
SONAL INJURY OR DEATH.
4.2 MOUNTING LOCATION
Choose a location that offers a flat, rigid mounting sur-
face capable of supporting the weight of the enclosed
transfer switch equipment (Figure 4-1 or 4-2). Avoid
locations that are moist, hot, or dusty. Enclosure
designs are, however, available for special environ-
ments. If there are any doubts as to location suitability,
discuss it with your Cutler-Hammer representative.
Check to make certain that there are no pipes, wires, or
other hazards in the immediate area that could create a
problem. The panels provide ample room for rear cable
entry from top, bottom, and sides. At no time should
cable be routed to retard the action of relays or cover
the logic in a way that restricts adjustments. Maintain
proper electrical clearances between live metal parts
and grounded metal.
For installation and maintenance purposes, the primary
and secondary sources must have an overcurrent pro-
tective device upstream of the transfer switch, unless
overcurrent protection is integral to the switch.
Dimensions of the transfer switch are an important con-
sideration in determining proper location selection
(Figure 4-1and 4-2).
4.3 MOUNTING PROCEDURE
SINCE THE ENCLOSED TRANSFER SWITCH MUST
BE LIFTED INTO PLACE FOR MOUNTING, BE CER-
TAIN THAT ADEQUATE RESOURCES ARE AVAIL-
ABLE FOR LIFTING TO AVOID PERSONNEL
INJURIES OR EQUIPMENT DAMAGE.
Cable entry holes are not part of the enclosure when
shipped from the factory and must be provided in the
field, either before or after mounting the enclosure.
Proceed with the following four steps:
Step 1: Carefully uncrate the transfer switch. If damage
is visible, please contact your local Cutler-
Hammer sales representative or the factory at
800-354-2070.
Step 2: Open the door and visually verify that there are
no broken or damaged components or evidence
of distorted metal or loose wires as a result of
rough handling.
Step 3: A label on the baseplate provides specifications
for your transfer switch. Verify that these specifi-
cations comply with your requirements.
Step 4: Remove any braces or packing used to protect
the transfer switch or internal components dur-
ing shipping.
EXTREME CARE SHOULD BE TAKEN TO PROTECT
THE TRANSFER SWITCH FROM DRILL CHIPS, FIL-
INGS, AND OTHER CONTAMINANTS WHEN MAK-
ING THE CABLE ENTRY HOLES AND MOUNTING
THE ENCLOSURE TO PREVENT COMPONENT DAM-
AGE OR A FUTURE MALFUNCTION.
With the enclosed transfer switch equipment unpacked
and ready for mounting, proceed with the following steps:
Step 1: The transfer switch enclosure door is hinge-
mounted with removable hinge pins. To simplify
the mounting procedure, carefully remove the
!
WARNING
!
CAUTION
!
CAUTION