Mersen Surge-Trap STZ series User manual

MERSEN USA Newburyport-MA, LLC
374 MERRIMAC STREET — NEWBURYPORT, MA 01950
T 978 462 6662 — F 978 462 0181 — [e-mail]
ep.mersen.com INS-270386 Rev (-)
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STZ SERIES (ENGLISH)
Surge-Trap®STZ series Surge Protective Device (SPD)
•Only qualified licensed electricians should install or service SPDs
•Verify that all power circuits are de-energized before making connections. SPDs should never be installed or serviced
when energized or during electrical storms
•Follow safe electrical work practices and use appropriate safety precautions including Personal Protection Equipment
(PPE)
•Confirm XO N-G bonding at upstream transformer
•When used in outdoor applications, customer must seal the conduit nipple using watertight fittings (not included) to
ensure watertight connection
•Read this manual in its entirety prior to installation
•These installation instructions do not replace the national or local electrical codes
•Failure to follow these instructions can result in death, serious injury and/or equipment damage
•Caution – Ungrounded power systems are inherently unstable and can produce excessively high line-to-ground voltages
during certain fault conditions. During these fault conditions any electrical equipment, including an SPD, may be
subjected to voltages which exceed their designed ratings. This information is being provided to the user so that an
informed decision can be made before installing any electrical equipment on an ungrounded power system.
Danger – Hazard of Electrical Shock, Explosion or Arc Flash

MERSEN USA Newburyport-MA, LLC
374 MERRIMAC STREET — NEWBURYPORT, MA 01950
T 978 462 6662 — F 978 462 0181 — [e-mail]
ep.mersen.com INS-270386 Rev (-)
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NSTRUCTIONS
STZ SERIES (ENGLISH)
1. Introduction
Thank you for purchasing a Mersen Surge-Trap®surge
protective device (SPD). This SPD is listed and certified to
UL 1449 and CSA C22.2 (latest editions). This device is a
Type 1 Listed SPD intended for parallel connection,
installed adjacent, above or below existing electrical
equipment. Supplemental Overcurrent Protection is not
required to protect this unit.
Table of contents for this installation guide:
1. Introduction
2. Installation
3. Operation
4. Maintenance
5. Warranty
1.1 Safety Precautions
Check the facility grounding system. All grounding,
bonding, and earthing must meet the National Electric
Code®(NEC®), Canadian Electrical Code (CEC) and any
other national, state and local electrical codes.
A licensed/qualified electrician must complete all
instructions in this manual in accordance with the NEC,
CEC, state, and local codes, or other applicable country
codes. All applicable local electrical codes supersede
these instructions.
Prior to installing this SPD confirm that the system voltage
and configuration matches the nameplate of the SPD.
Installing a SPD that is improperly rated for the electrical
system voltage could create a potentially hazardous
condition, resulting in personnel injury and/or equipment
damage.
1.2 Service Guidelines
Service of this unit consists of replacing the internal surge
module, disconnect switch (including accessories) and/or
human-machine interface.
There are no user-serviceable parts inside the replaceable
surge module. Do not attempt to disassemble the surge
module for safety precautions and to maintain product
warranty.
1.3 Model Number Descriptions and Options
Each unit includes product labeling defining the model
series, system voltage and configuration, surge capacity,
short-circuit current rating (SCCR), maximum continuous
operating voltage (MCOV), voltage protection rating (VPR)
and product options. Check that the product nameplate
matches your intended application.
STZ 480Y 20 B 1 T
Model
Series
System
Voltage
and
Config
Surge
Capacity Feature Package Enclosure Disconnect Switch
Catalog number STZ480Y20B1T shown for example only
Note: For additional configurations or if you do not
see your configuration listed, please consult the
factory.
Model Series
•STZ = Surge-Trap Type 1 SPD
Voltage and System Configuration
•240S = 240/120V Split Phase
•208Y = 208Y/120V 3-Phase WYE
•480Y = 480Y/277V 3-Phase WYE
•240D = 240V 3-Phase DELTA
Surge Capacity per Phase
•10 = 100kA
•20 = 200kA
•30 = 300kA
Feature Package
•A = LED status indicators per phase including
service, phase loss detection
•B = LED status indicators per phase including
service, phase loss detection, audible alarm with
silence, Form C dry contacts, EMI/RFI filter (self-
certified, not UL evaluated), surge counter
Enclosure
•1 = NEMA 1/12/3R/4 painted steel
•X = NEMA 4X stainless steel
Disconnect Switch
•BLANK = None
•T = UL98 Listed disconnect switch with through
the door shaft and exterior operating handle

MERSEN USA Newburyport-MA, LLC
374 MERRIMAC STREET — NEWBURYPORT, MA 01950
T 978 462 6662 — F 978 462 0181 — [e-mail]
ep.mersen.com INS-270386 Rev (-)
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STZ SERIES (ENGLISH)
2. Installation
Warning: Conducting dielectric, megger, or hi-potential
testing with the SPD installed will cause internal damage
to the SPD and will void the product warranty. If these
tests are desired, SPD must be disconnected from the
power distribution system.
2.1 Unpacking and Preliminary Inspection
Inspect the entire shipment container for damage or signs
of mishandling. Remove the packing materials and further
inspect the unit for any shipping damages.
If any damages were found and is a result of shipping and
handling, immediately file a claim with the shipping
company and forward a copy to Mersen.
2.2 Planning (including Lead Lengths and
Maximizing SPD Performance, Service
Clearance)
SPDs should be located as close as possible to the circuit
being protected in order to minimize voltage drop across
conductors, optimizing SPD performance. When planning
your installation, use the shortest (≥ 6 inches) and
straightest (avoid sharp bends) leads possible and ensure
the nearest circuit breaker positions are used. Additionally,
twist leads together or use tie-wraps to optimize SPD
performance.
Service Clearance is needed at the front of the unit. 36
inches minimum is the required distance in accordance
with the National Electrical Code.
For optimum protection and for critical applications, a
cascaded surge protection should be implemented at the
service entrance and downstream locations as
appropriate. Localized surge protection (individual
equipment) should also be considered for sensitive loads
and known areas of surge activity.
2.3 Mounting (including Outline Drawing and
Weights)
The STZ series NEMA enclosed devices are intended for
wall mount applications. Mechanical drawings, including
mounting hole locations and weights can be found at the
back of this manual.
2.4 Module Rotation Feature
Depending on desired cable entry location, the internal
SPD module can be rotated in increments of 90 degrees
to support top, bottom, left and right cable entry. To adjust
for desired cable entry, disconnect RJ-45 communication
cable from the SPD module. Remove RJ-45 cable from
cord clip. Remove the four mounting screws in each
corner of the backplane (SPD module does not need to be
removed from backplane). Rotate to desired position. Re-
install backplane using the four screws. Insert RJ-45
communication cable into appropriate RJ-45 cord clip. Re-
connect RJ-45 communication cable. Note: for
illustrations below, RJ-45 communication cable and
cord clips not shown in images below.
Desired orientation for bottom cable entry
Desired orientation for right cable entry
Desired orientation for top cable entry
Desired orientation for left cable entry

MERSEN USA Newburyport-MA, LLC
374 MERRIMAC STREET — NEWBURYPORT, MA 01950
T 978 462 6662 — F 978 462 0181 — [e-mail]
ep.mersen.com INS-270386 Rev (-)
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Note: RJ-45 communication cable must be secured properly using
appropriate cord clip
Devices with the disconnect switch option “T” can only be
positioned for top or bottom cable entry. For these models
please plan accordingly to optimize device performance.
2.5 Conduit installation
Once pre-planning is completed and desired cable entry
location is defined, remove an appropriately sized
knockout from the electrical equipment to be protected.
Create an appropriately sized and located hole in the SPD
enclosure. Using approved wiring methods, determine the
correct conduit for phase, neutral and ground conductors
and install onto the SPD enclosure and electrical
equipment to be protected (including seals and fittings
appropriate for the enclosure rating). If using the Form C
contacts (included in feature package B), route Form C
conductors through a separate conduit.
2.6 Wiring Diagrams and System Configurations
Wiring diagrams per system configuration can be found at
the back of this manual. Prior to installing this SPD confirm
that the system voltage and configuration matches the
nameplate of the SPD.
2.7 Wire Terminals, Wire Size and Terminal Torque
Wire terminals for phase and neutral will accept 8 to 2
AWG stranded copper conductors. The wire terminal for
ground will accept 8 to 2/0 AWG stranded copper
conductors. Per the wiring diagram, insert phase, neutral
and ground conductors into designated terminal locations
and torque to the following specifications. If your device is
equipped with the disconnect switch option please
proceed to the next section.
Model Terminal
Designation Wire AWG Torque (lbs-in)
Min. Max.
STZ…1
STZ…X
Phases A, B, C
and Neutral as
applicable
3
2
50
6
4
45
8
8
40
Ground
3
2/0
50
6
4
45
8
8
40
2.8 Disconnect Switch Option
If ordered with disconnect switch option “T” device will
include UL98 Listed load-break disconnect switch. The
disconnect switch provides manual disconnection means
for the phase conductors and the neutral conductor.
Ground is not switched.
Wire terminals for phase and neutral will accept 8 to 1/0
AWG stranded copper conductors. The wire terminal for
ground will accept 8 to 2/0 AWG stranded copper
conductors. Per the wiring diagram, insert phase, neutral
and ground conductors into designated terminal locations
and torque to the following specifications.
Model Terminal
Designation Wire AWG Torque (lbs-in)
Min. Max.
STZ…1T
STZ…XT
Phases A, B, C
and Neutral as
applicable
8 1/0 55
Ground
3
2/0
50
6
4
45
8
8
40
2.9 Form C Dry Contact and Audible Alarm Option
This option is included in feature package “B” only. Dry
contacts will change state and audible alarm will sound
upon SPD module end-of-life or phase loss detection. The
audible alarm can be silenced by pressing the “Silence
Alarm” button on the device interface.
Terminal Block for Dry Contacts
Wire terminals for the remote status indicator will accept
30 to 12 AWG solid or stranded copper conductors.
Model Terminal
Designation Wire AWG Torque (lbs-in)
Min. Max. Min. Max.
STZ…B1
STZ…B1T
STZ…BX
STZ…BXT
Remote
Status 30 12 5 7
2.10 Power-up
Energize and confirm proper operation of indicators,
alarms and/or options/features. If Red service indicator is

MERSEN USA Newburyport-MA, LLC
374 MERRIMAC STREET — NEWBURYPORT, MA 01950
T 978 462 6662 — F 978 462 0181 — [e-mail]
ep.mersen.com INS-270386 Rev (-)
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illuminated or audible alarm and dry contacts cycle, de-
energize immediately and contact Mersen for assistance.
3. Operation
All visual indicators and controls are located on the
human-machine interface (HMI) (aka diagnostic display).
The HMI is located on the front of the SPD enclosure door.
Both STZ feature packages “A” and “B” include multi-
colored LED health status indicators for A, B, C phase and
neutral as well as a red LED service indicator. Package
“B” additionally features a surge counter with reset button
and an audible alarm with silence button.
Feature Package “A” HMI
Feature Package “B” HMI
3.1 LED Status Indicators
Every TPMOV suppression element within the SPD is
monitored. Green LEDs indicate correct operation. For
device health indication, the following colors apply:
•Green = 67 to 100% life remaining
•Amber = 34 to 66% life remaining
•Red = 0 to 33% life remaining
If the red service LED is illuminated this means the device
has reached end-of-life and the SPD module must be
replaced.
3.2 Surge Counter Option (Package “B”)
The surge counter LCD is a six-digit numeric display. The
counter will register the number of surge events on all
modes L-L, L-N, L-G and N-G since the last reset. Each
event will increment the counter by (+1). By pressing the
reset button, the device memory will be cleared and the
counter reset to (0). The counter is equipped with a
backup storage which will retain information indefinitely
even upon power loss.
3.3 Audible Alarm Option (Package “B”)
The audible alarm will sound upon SPD module end-of-life
or phase loss detection. The audible alarm can be
silenced by pressing the “Silence Alarm” button on the
device interface.
3.4 Dry Contact Option (Package “B”)
Dry contacts will change state upon SPD module end-of-
life or phase loss detection.
The green dry contact terminal block located on the SPD
module includes (1) set of Normally Open (NO) and
Normally Closed (NC) contacts.
Form C Dry Contact Ratings:
•125VAC, 1A Resistive
•30VDC, 2A General Purpose
4. Maintenance
Perform periodic inspection of the SPD status indicator
lights as part of the preventive maintenance schedule.
Promptly service the SPD when an alarm state exists.
Use dry contacts to signal an alarm state to the central
supervisory system for unmanned, inaccessible, or critical
installations.

MERSEN USA Newburyport-MA, LLC
374 MERRIMAC STREET — NEWBURYPORT, MA 01950
T 978 462 6662 — F 978 462 0181 — [e-mail]
ep.mersen.com INS-270386 Rev (-)
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STZ SERIES (ENGLISH)
4.1 Troubleshooting and Service
Please contact Mersen technical services for any service
or product related issue.
•Phone: [phone] (USA)
•Email: [e-mail]
4.2 Module Replacement
When service indicator is illuminated, the SPD module has
reached end-of-life and must be replaced. (Note: if service
indicator is illuminated, the device is no longer protecting
your equipment. Make sure to service the unit as soon as
possible to avoid equipment damage due to surge events)
SPD Module (STZ…Q)
The following steps should be taken to remove the SPD
module: Disconnect all power sources feeding the SPD
(via breaker or disconnect switch). Loosen phase, neutral
and ground wire terminals so that the conductors are no
longer bound to the SPD module (for both disconnect
switch and non-disconnect switch options). Remove HMI
RJ-45 communication cable from face of the module and
cord clip. Remove green dry contact terminal form SPD
module by pulling on terminal block (option for feature
package B only). Remove the eight mounting screws
holding the SPD module to the backplane. Remove SPD
module and discard. Install new SPD module by repeating
the steps for removal in reverse order.
4.3 HMI (Human-Machine Interface) Replacement
When replacing the HMI, do not remove the HMI overlay
(exterior facing label). Only the HMI circuit board should
be replaced. The HMI circuit board is located on the inside
of the enclosure door to which the overlay is adhered to.
To remove the cover, first disconnect the RJ-45
communication cable and the overlay ribbon cable from
the HMI. Remove the four mounting nuts and washers in
each corner of the circuit board from the PEM studs.
Remove the HMI from the enclosure door. Do not remove
the spacers that are located between the HMI and the
enclosure door. Install the new HMI by aligning the four
mounting holes in the corner of the circuit board onto the
PEM studs of the enclosure door. Re-install mounting
washers and nuts onto each PEM stud, tighten securely.
Re-connect RJ-45 communication cable and overlay
ribbon cable to the HMI.
Note: HMI feature package must match original feature
package of SPD. Feature package “B” HMI will not work
with SPD feature package “A” and vice versa.
Replacement HMI catalog numbers (includes circuit board
only):
•STZAHMI (Feature Package A)
•STZBHMI (Feature Package B)
4.4 Disconnect Switch Replacement (option)
The disconnect switch is directly mounted to the enclosure
backplane. To remove, loosen the disconnect switch line
side wire terminals so that the conductors from the SPD
module are no longer bound to the switch; remove the two
mounting screws that are holding the switch to the
backplane; remove disconnect switch and discard.
Conductors from the SPD module to the switch do not
need to be removed. Install new disconnect switch by first
placing it in position, making sure the SPD module
conductors are re-inserted into switch line side terminals;
Re-install the two mounting screws; re-torque SPD module
conductors according to table.
5. Warranty
Mersen warrants Surge-Trap STZ Series for a period of 15
years from the date of delivery to the purchaser to be free
from defects in both workmanship and materials. To read
the entire warranty terms and conditions, please visit
ep.mersen.com

MERSEN USA Newburyport-MA, LLC
374 MERRIMAC STREET — NEWBURYPORT, MA 01950
T 978 462 6662 — F 978 462 0181 — [e-mail]
ep.mersen.com INS-270386 Rev (-)
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STZ SERIES (ENGLISH)
Split Phase, 3-Wire + Ground
STZ240S…1
3-Phase WYE, 4-Wire + Ground
STZ208Y…1 STZ480Y…1
3-Phase DELTA, 3-Wire + Ground
STZ240D…1
Split Phase, 3-Wire + Ground
STZ240S…1T
3-Phase WYE, 4-Wire + Ground
STZ208Y…1T STZ480Y…1T
3-Phase DELTA, 3-Wire + Ground
STZ240D…1
Wiring Diagrams

MERSEN USA Newburyport-MA, LLC
374 MERRIMAC STREET — NEWBURYPORT, MA 01950
T 978 462 6662 — F 978 462 0181 — [e-mail]
ep.mersen.com INS-270386 Rev (-)
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STZ…1
STZ…X
STZ…1T
STZ…XT
Mechanical Drawings
Maximum Weight = 27 lbs
Maximum Weight = 23 lbs
10.00