ASCO POWER TECHNOLOGIES 425 User manual

Surge Protective Devices Installation & Operation Manual
Model 425

© 2020 ASCO Power Technologies
All Rights Reserved
Model 425 Surge Protective Device (SPD)
Table of Contents
IO-70060
2
Precautions
Introduction
Unpacking and Preliminary Inspection
Storage
Identication Nameplate
SPD Location Considerations
Environment
Audible Noise
Mounting
Service Clearance
Equipment Performance
Electrical
Voltage Rating
Branch Circuit Overcurrent Protection and Disconnect Means
Location of Surge Protective Device (SPD)
System Grounding
Parts List
Wiring
ASCO 425 Wiring Diagrams
Surface Mount Installation
Operation
LED Status Indicators
Dry Contacts
Connecting Form C Dry Contact & Audible Alarm
Remote Monitor Option
Preventive Maintenance
4
5
6
6
6
6
6
6
6
6
6
7
7
8
8
9
10
10
12
13
14
14
15
16
17
18

© 2020 ASCO Power Technologies. All Rights Reserved 3
IO-70060
05/2020
For access to self-service tools and chat support visit se.com/us/en/work/support or call 1-888-778-2733 for technical assistance
Safety Information
Important Information
Read these instructions carefully and look at the equipment to become
familiar with the device before trying to install, operate, service or maintain it.
The following special messages may appear throughout thisbulletin or on the
equipment to warn of potential hazards or to call attention to information that
clarifies or simplifies a procedure.
The addition of either symbol to a “Danger”or “Warning” safety label
indicates that an electrical hazard exists which will result inpersonal
injury if the instructions are not followed.
This is the safety alert symbol. It is used to alert you to potential
personal injury hazards. Obey all safety messagesthat follow this
symbol to avoid possible injury or death.
DANGER
DANGER indicates a hazardous situation which, if not avoided,
will result in death or serious injury.
WARNING
WARNING indicates a hazardous situation which, if not avoided,
could result in death or serious injury.
CAUTION
CAUTION indicates a hazardous situation which, if not avoided,
could result in minor or moderateinjury.
NOTICE
NOTICE is used to address practices not related to physical injury. The safety
alert symbol shall not be used with this signal word.
Please Note
Electrical equipment should be installed, operated, serviced, and maintained only
by qualified personnel. No responsibility is assumed by ASCO Power Technologies
for any consequences arising out of the use of this material.
A qualified person is one who has skills and knowledge related to the
construction, installation, and operation of electrical equipment andhas received
safety training to recognize and avoid the hazards involved.

© 2020 ASCO Power Technologies. All Rights Reserved
4
IO-70060
05/2020
For access to self-service tools and chat support visit se.com/us/en/work/support or call 1-888-778-2733 for technical assistance
ASCO 425 Surge Protective Device (SPD)
Precautions
Precautions
HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH
• Apply appropriate personal protective equipment (PPE) and follow safe
electrical work practices. See NFPA 70E, NOM-029-STPS or CSA Z462.
• This equipment must only be installed and serviced by qualied electri-
cal personnel.
• Turn o󰀨 all power supplying this equipment before working on or inside
equipment.
• Always use a properly rated voltage sensing device to conrm power is o󰀨.
• Replace all devices, doors and covers before turning on power to this
equipment.
• This equipment must be e󰀨ectively grounded per all applicable codes.
Use an equipment-grounding conductor to connect this equipment to the
power system ground.
Failure to follow these instructions will result in death or serious injury.
WARNING: This product can expose you to chemicals including
DINP, which is known to the State of California to cause cancer, and
DIDP which is known to the State of California to cause birth defects
or other reproductive harm. For more information go to: www.
P65Warnings.ca.gov.
NOTICE
LOSS OF BRANCH CIRCUIT POWER / LOSS OF SURGE
SUPPRESSION
• Perform periodic inspection of the surge protective device status
indicator lights as part of the preventative maintenance schedule.
• Promptly replace the surge protective device when an alarm state
exists.
• Use dry contacts to signal an alarm state to the central supervisory
system for unmanned, inaccessible, or critical installations.
• Use multiple surge protective devices to achieve redundancy for critical
applications.
Failure to follow these instructions can result in equipment damage.
At end-of-life conditions, Surge Protective Devices (SPDs) can lose their
ability to suppress power system transient voltage spikes and attempt to
draw excessive current from the line. This SPD is equipped with overcurrent
and overtemperature components that will automatically disconnect the
surge suppression elements from the mains should the surge suppression
elements reach end of life. Tripping of the branch circuit breaker or fuse
feeding the SPD can occur. Mitigate the tripping of the branch circuit breaker
or fuse feeding the SPD by coordinating the surge suppression elements
with the branch circuits.
DANGER

© 2020 ASCO Power Technologies. All Rights Reserved 5
IO-70060
05/2020
For access to self-service tools and chat support visit se.com/us/en/work/support or call 1-888-778-2733 for technical assistance
ASCO 425 Surge Protective Device (SPD)
Introduction
HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH
• Do not energize the surge protective device until the electrical system is
completely installed, inspected and tested.
• Ensure all conductors are connected and functional.
• Verify the voltage rating of the device and system prior to energizing.
• Perform high-potential insulation testing, or any other tests where surge
protective device components will be subjected to voltages higher than
their rated turn-on voltage, with the neutral and surge protective device
disconnected from the power source
Failure to follow these instructions will result in death or serious injury.
HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH
• Apply appropriate personal protective equipment (PPE) and follow safe
electrical work practices. See NFPA 70E, NOM-029-STPS or CSA Z462.
• This equipment must only be installed and serviced by qualied
electrical personnel.
• Turn o󰀨 all power supplying this equipment before working on or inside
equipment.
• Always use a properly rated voltage sensing device to conrm power is
o󰀨.
• Replace all devices, doors and covers before turning on power to this
equipment.
• This equipment must be e󰀨ectively grounded per all applicable codes.
Use an equipment-grounding conductor to connect this equipment to the
power system ground.
Failure to follow these instructions will result in death or serious injury.
Proper installation is imperative to maximize the ASCO 425 SPDs
e󰀨ectiveness and performance. Follow the steps outlined in this instruction
bulletin to ensure proper installation. Read the entire instruction bulletin
before beginning the installation. These instructions are not intended to
replace national or local electrical codes. Check all applicable electrical
codes to verify compliance. Installation of ASCO 425 surge suppressors
must only be performed by qualied electrical personnel.
DANGER
DANGER
Introduction
Note: For access to self-service
tools and chat support visit
se.com/us/en/work/support or
call 1-888-778-2733 for technical
assistance

© 2020 ASCO Power Technologies. All Rights Reserved
6
IO-70060
05/2020
For access to self-service tools and chat support visit se.com/us/en/work/support or call 1-888-778-2733 for technical assistance
ASCO 425 Surge Protective Device (SPD)
Unpacking and Preliminary Inspection
Unpacking and Preliminary
Inspection
Storage
Identication Nameplate
SPD Location
Considerations
Environment
Audible Noise
Mounting
Service Clearance
Equipment Performance
Inspect the entire shipping container for damage or signs of mishandling be-
fore unpacking the device. Remove the packing material and further inspect
the device for any obvious shipping damage. If any damage is found and is
a result of shipping or handling, immediately le a claim with the shipping
company.
The device should be stored in a clean, dry environment. Storage tempera-
ture is -67 °F to +149 °F (-55°C to +65°C). All of the packaging materials
should be left intact until the device is ready for installation.
The identication nameplate is located on the side of the unit.
The device is designed to operate in an ambient temperature range of
-13° F to +140° F (-25° C to +60° C) with a relative humidity of 0 to 95%
non-condensing. This device has a Type 4X housing.
The device background noise is negligible and does not restrict the location
of the installation.
The device has been designed to be surface mounted. An additional ush
mount kit is also available if required (XMFMKIT).
The service clearance should meet all applicable code requirements.
To obtain optimum surge suppression, locate the SPD as close as possible
to the circuitry being surge-limited to minimize the wire length. Minimizing
the wire length reduces the impedance between the circuitry and the SPD.
Refer to the Voltage Protection Rating (VPR) values on the SPD nameplate.
These VPR values were obtained by testing the SPD with six-inch long
leads (per UL1449). For every additional foot of wire beyond six inches, the
e󰀨ective VPR increases by approximately 160 volts.
ASCO POWER TECHNOLOGIES, LP
CAT# 425_____________
PART# __XCS__________
VOLTAGE: ____________V 50-60Hz
MAX RATED AMBIENT AIR TEMP: ________
MFG DATE: _________
Suitable for use on a circuit capable of delivering not more
than _________ rms symmetrical amperes
ENC TYPE: XXXX
In: 20 kA
____V
VOLTAGE
PROTECTION RATING
CW
UL 1449-4
SPD TYPE __
MCOV: ____ / _____
L-N
L-G
N-G
L-L
____
____
____
____
UL
Hologram

© 2020 ASCO Power Technologies. All Rights Reserved 7
IO-70060
05/2020
For access to self-service tools and chat support visit se.com/us/en/work/support or call 1-888-778-2733 for technical assistance
ASCO 425 Surge Protective Device (SPD)
Electrical
HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH
Conrm the surge protective device voltage rating on the module or
nameplate label is not less than the operating voltage.
Failure to follow these instructions will result in death or serious injury.
Prior to mounting the SPD, verify that the device has the same voltage
rating as the power distribution system in which it is installed. Compare the
nameplate voltage or model number on the SPD with the nameplate of the
electrical distribution equipment.
The specier or user of the device should be familiar with the conguration
and arrangement of the power distribution system in which the SPD is to be
installed. The system conguration of any power distribution system is based
strictly on how the secondary windings of the transformer supplying the ser-
vice entrance main or load are congured. This includes whether or not the
transformer windings are referenced to earth via a grounding conductor. The
system conguration is not based on how any specic load or equipment
is connected to a particular power distribution system. See Table 1 for the
service voltage of each SPD.
Electrical
Voltage Rating
Table 1: Model 425 Service Voltages

Voltage Codes
P 10 W A JA
Per Phase
kA Rating
System
Modes of
Protection
(Default)
Connection
Type
Monitoring
Options
Enclosure

UL 1449
Type1/Type 2

Accessory/
Option(s)
kA Rating
Per Phase
425
Model 425
Product Line
J = NEMA 4X Non-Metallic
(Polycarbonate)
Size - 8.3” x 3.6” x 3.0”
W = Wire Leads
A = LEDs/Audible Alarm/Relay
1 = UL 1449 Type 1
2 = UL 1449 Type 2,
0 = No Trailing Accessory/Option
X = Yes Trailing Accessory/Option
10 = 100kA
DANGER
Common Systems
120S = 120/240V Split Phase - 1Ø, 3W+Ground
120Y = 208Y/120V Wye - 3Ø 4W+Ground
230Y = 400Y/230V Wye - 3Ø 4W+Ground
240H = 240/120V High Leg Delta (B High)
240D = 240V Delta - 3Ø 3W+Ground
277Y = 480Y/277V Wye - 3Ø 4W+Ground
347Y = 600Y/347V Wye - 3Ø 4W+Ground
480D = 480V Delta - 3Ø 3W+Ground & HRG Wye
600D = 600V Delta - 3Ø 3W+Ground & HRG Wye
Other Systems - Confirmation Encouraged
127S = 127/254V Split Phase - 1Ø 3W+Ground
127Y = 220Y/127V Wye - 3Ø 4W+Ground
220Y = 380Y/220V Wye - 3Ø 4W+Ground
240S = 240/480V Split Phase, or Two legs of Wye
240Y = 415Y/240V Wye - 3Ø 4W+Ground
240C = 240V B Corner Ground Delta, 3Ø 3W+Ground
254Y = 440Y/250V Wye - 3Ø 4W+Ground
277S = 240/480V Split Phase, or Two legs of Wye
300Y = 520Y/300V Wye - 3Ø 4W+Ground
480C = 480V B Corner Ground Delta, 3Ø 3W+Ground
600C = 600V B Corner Ground Delta, 3Ø 3W+Ground

© 2020 ASCO Power Technologies. All Rights Reserved
8
IO-70060
05/2020
For access to self-service tools and chat support visit se.com/us/en/work/support or call 1-888-778-2733 for technical assistance
ASCO 425 Surge Protective Device (SPD)
Electrical
Branch Circuit Overcurrent
Protection and Disconnect Means
Location of Surge Protective
Device (SPD)
HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH
• Use conductors rated for the Overcurrent Protection Device (OCPD) per
applicable codes.
• Use conductors rated for the application per applicable codes.
Failure to follow these instructions will result in death or serious injury.
A branch circuit Overcurrent Protection Device (OCPD) either in the form of
a circuit breaker or fuse must be provided for the ASCO 425 Type 2 device.
The branch circuit OCPD should either provide or include a disconnecting
means.
Since the current drawn by the ASCO 425 device during normal operation is
negligible, the ASCO 425 device can be connected to a dedicated, separate
branch circuit or connected to a suitable existing branch circuit.
When connected to a separate, dedicated branch circuit, the OCPD setting
must be selected to protect the conductors feeding the ASCO 425 device
per applicable state and local building codes.
UL 1449 Type 1 SPDs have been designed and approved for line side appli-
cations prior to the main service disconnect without supplemental overcur-
rent protection. Type 2 SPDs must be installed on the load side of the main
Overcurrent Protective Device (OCPD). All installations should either provide
or include a disconnecting means.
Type 1 SPDs can also be used in Type 2 applications (load side of OCPD).
When either Type 1 or Type 2 SPDs are used on the load side, they must be
installed per local codes.
Locate the SPD as close as possible to the circuit mains being surge-limited
to minimize the wire length and optimize SPD performance. Avoid long wire
runs so that the device will perform as intended. To reduce the impedance
that the wire displays to surge currents, the phase, neutral, and ground
conductors (wye and high-leg delta congurations), or phase and ground
conductors (delta congurations), must be routed within the same conduit
and tightly bundled or twisted together to optimize device performance.
Avoid sharp bends in the conductors. See Figures 2 and 3.
Figure 2: SPD Wiring for Wye and High-Leg Delta Congurations
DANGER
To load(s)
Phases
Neutral
Ground
Ground bus
Neutral bus
SPD
Phase A
Phase B
Phase C
Neutral
Ground
Panel
Interconnect wiring
– Minimize length
– Avoid sharp bends

© 2020 ASCO Power Technologies. All Rights Reserved 9
IO-70060
05/2020
For access to self-service tools and chat support visit se.com/us/en/work/support or call 1-888-778-2733 for technical assistance
ASCO 425 Surge Protective Device (SPD)
System Grounding
Figure 3: SPD Wiring for Delta Congurations
To load(s)
Phases
Ground
Phase A
Phase B
Phase C
Ground
SPD
Interconnect wiring
– Minimize length
– Avoid sharp bends
HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH
• Ungrounded power systems are inherently unstable and can produce
excessively high line-to-ground voltages during certain electrical
fault conditions. During these electrical fault conditions any electrical
equipment, including a surge protective device, may be subjected to
voltages which exceed their designed ratings.
• Make an informed decision before installing any electrical equipment on
an ungrounded power system.
Failure to follow these instructions will result in death or serious injury.
NOTICE
LOSS OF SURGE SUPPRESSION
• Verify that the service entrance equipment is bonded to ground in
accordance with all applicable codes.
Failure to follow these instructions can result in equipment damage.
The ASCO 425 has SPD elements connected from phase to ground. It is
critical that there be a robust and e󰀨ective connection to the building
grounding structure. The grounding connection must utilize an equipment
grounding conductor run with the phase and neutral connection of the power
system. Do not connect the SPD to a separate isolated ground.
For proper voltage suppression by the ASCO 425 SPD, use a single-point
ground system where the service entrance grounding electrode system is
connected to, and bonded to, all other available electrodes, building steel,
metal water pipes, driven rods, etc. (for reference, see NEC Art 250). The
ground impedance measurement of the electrical system must be as low as
possible and in compliance with all applicable codes for sensitive electronic
and computer systems.
System Grounding DANGER

© 2020 ASCO Power Technologies. All Rights Reserved
10
IO-70060
05/2020
For access to self-service tools and chat support visit se.com/us/en/work/support or call 1-888-778-2733 for technical assistance
ASCO 425 Surge Protective Device (SPD)
Wiring
Wiring and Installation
Parts List
HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH
• Install an insulated grounding conductor inside a metallic raceway when
the raceway is used as an additional grounding conductor. Size the
conductor in accordance with all applicable codes.
• Maintain adequate electrical continuity at all raceway connections.
• Do not use isolating bushings to interrupt a metallic raceway run.
• Do not use a separate isolated ground for the surge protective device.
• Verify proper equipment connections to the grounding system.
• Verify ground grid continuity by inspections and testing as part of a
comprehensive electrical maintenance program.
Failure to follow these instructions will result in death or serious injury.
DANGER
1 - Model 425 suppressor including 3 feet (.91 M) conductors
1 - Data Sheet
HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH
• Apply appropriate personal protective equipment (PPE) and follow safe
electrical work practices. See NFPA 70E, NOM-029-STPS or CSA Z462.
• This equipment must only be installed and serviced by qualied electri-
cal personnel.
• Turn o󰀨 all power supplying this equipment before working on or inside
equipment.
• Always use a properly rated voltage sensing device to conrm power is
o󰀨.
• Replace all devices, doors and covers before turning on power to this
equipment.
• This equipment must be e󰀨ectively grounded per all applicable codes.
Use an equipment-grounding conductor to connect this equipment to the
power system ground.
• Conrm the surge protective device voltage rating on the module or
nameplate label is not less than the operating voltage.
Failure to follow these instructions will result in death or serious injury.
DANGER

© 2020 ASCO Power Technologies. All Rights Reserved 11
IO-70060
05/2020
For access to self-service tools and chat support visit se.com/us/en/work/support or call 1-888-778-2733 for technical assistance
ASCO 425 Surge Protective Device (SPD)
Wiring
Follow steps 1 through 7 to make wiring connections:
1. Turn o󰀨 all power supplying this equipment before working on or inside
any enclosure containing this equipment. If SPD has optional Dry
Contact, pre-plan its installation.
2. Conrm SPD is rated for your system by comparing voltage
measurements to the Line Voltage (L-L, L-N) on the product label.
3. Identify proper location for the SPD. Locate as close as possible to
the mains of the panel being surge-limited so the wires are as short as
possible. Mount unit securely. Note: The SPD must be installed in an
accessible location
4. Mount SPD. For weather resistant applications additional sealing, O-ring
is required. (not included) See gure 4
5. Install in accordance with national and local electrical codes and match
the branch circuit Overcurrent Protection Device (OCPD) to the wire
size. For all wires, twist conductors 1/2 turn or more for every twelve
inches of length.
6. Do not loop or coil wires. Be sure to maintain adequate wire bending
space per NEC. Trim excessive wire length. Use on solidly grounded
systems unless the SPD model is designed for installation on
ungrounded/HRG systems.
7. Energize and conrm proper operation of green LED indicator.
HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH
• On a high-leg delta installation, the high-leg of the power system must
be connected to the B phase lug of the SPD.
Failure to follow these instructions will result in death or serious injury.
DANGER
HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH
For outdoor installation use and appropriate weather sealing at the nipple
(o-ring, sealing conduit, etc).
Failure to follow these instructions will result in death or serious injury.
DANGER

© 2020 ASCO Power Technologies. All Rights Reserved
12
IO-70060
05/2020
For access to self-service tools and chat support visit se.com/us/en/work/support or call 1-888-778-2733 for technical assistance
ABC
G
N
BREAKER
ASCO 425 Surge Protective Device (SPD)
Wiring
Figure 4: Typical panel Installation
Figure 5: Parallel Wiring Diagram
▪Use closest breaker to
SPD
▪Locate SPD close to
intended breaker
▪
▪
▪Keep Leads Short as
Possible
▪Avoid Sharp Bends
▪Rotate Model 425 such
that LED indicator is
most visible
▪Outdoor installation
requires appropriate
weather sealing at nipple
(gasket, sealing conduit,
etc.)
▪To Protected Loads
▪(Type 1 or individual equipment
installations may vary)

© 2020 ASCO Power Technologies. All Rights Reserved 13
IO-70060
05/2020
For access to self-service tools and chat support visit se.com/us/en/work/support or call 1-888-778-2733 for technical assistance
Figure 6: Flush Mount Diagram
SPD
Hex Stando
(4 Provided)
Mounting Surface
Mounting Screws
(4 Places, Not Provided)
Flush Mount Kit Screws
(8 Provided)
Phase,Ground,
Neutral Wires
Flush Mount Plate
Removed Material
Figure 7: General Dimensions (in. / mm.)
ASCO 425 Surge Protective Device (SPD)
Wiring
Note: Mount the unit as close as possible to the protected panel.
1. Make perforations on the wall according to the screw holes located on
the enclosure. See Figure 7. (Rotate dimensions 90° as appropriate
depending on orientation).
2. Congure the electrical conductor and conduit connection consistent with
the installation instructions on page 12.
Surface Mount Installation
3.00
(76.20)
0.19
(4.83)
8.28
(210.31)
3.67
(93.22)
2.21
(56.13)
7.41
(188.21)
Weight: 3lbs (1.4kg)

© 2020 ASCO Power Technologies. All Rights Reserved
14
IO-70060
05/2020
For access to self-service tools and chat support visit se.com/us/en/work/support or call 1-888-778-2733 for technical assistance
ASCO 425 Surge Protective Device (SPD)
Wiring
Operation
HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH
• Apply appropriate personal protective equipment (PPE) and follow safe
electrical work practices. See NFPA 70E, NOM-029-STPS or CSA Z462.
• This equipment must only be installed and serviced by qualied electri-
cal personnel.
• Turn o󰀨 all power supplying this equipment before working on or inside
equipment.
• Always use a properly rated voltage sensing device to conrm power is
o󰀨.
• Replace all devices, doors and covers before turning on power to this
equipment.
• This equipment must be e󰀨ectively grounded per all applicable codes.
Use an equipment-grounding conductor to connect this equipment to the
power system ground.
Failure to follow these instructions will result in death or serious injury.
DANGER
LED Status Indicators
Figure 8: Diagnostic Operation
Diagnostic LEDs are located on the front of the ASCO 425 SPD device.
They operate as follows:
• Verify that all phase voltages are present. If the LED is not illuminated, the
device may not be installed correctly. Check the power supply and service
voltage. Upon energizing the SPD, check the LED status. If all of the LEDs
are illuminated, surge suppression is operating.
• If one or more LEDs are not illuminated, there is a loss of surge
suppression on that phase.
• If an inoperative condition occurs the device must be replaced by qualied
electrical personnel.
Indicator light ON = OK
Indicator light OFF =
loss of surge suppression
Individual phase monitoring
Audible alarm ON =
Loss of surge suppression

© 2020 ASCO Power Technologies. All Rights Reserved 15
IO-70060
05/2020
For access to self-service tools and chat support visit se.com/us/en/work/support or call 1-888-778-2733 for technical assistance
ASCO 425 Surge Protective Device (SPD)
Wiring
INADEQUATE DRY CONTACT USE
• Do not supply more than 24 Vdc / 24 Vac and no more than a current
of 2 A.
Failure to follow these instructions can result in injury and equipment
damage.
The ASCO 425 series SPD device is provided with dry contacts. These dry
contact leads can be used for remote indication of the SPD operating status
to a computer interface board or emergency management system. Also,
these dry contact leads are designed to work with the SPD remote monitor
option described in the following section.
The dry contacts are designed for a maximum voltage of 24 V dc / 24 V
ac and a maximum current of 2 A. Higher energy applications may require
additional relay implementation outside the SPD. Damage to the SPD’s
relay caused by use with energy levels in excess of those discussed in this
instruction bulletin is not covered by warranty. For application questions,
call the Surge Technical Assistance Group at [phone] or email
[e-mail]
CAUTION
Dry Contacts

© 2020 ASCO Power Technologies. All Rights Reserved
16
IO-70060
05/2020
For access to self-service tools and chat support visit se.com/us/en/work/support or call 1-888-778-2733 for technical assistance
ASCO 425 Surge Protective Device (SPD)
Wiring
Three 3 ft. (.91 m) 18 AWG wires are included through the nipple. See
Figure 9. Gray is Common, Blue is Normally Open and Red is Normally
Closed when energized in its expected installation. (When not energized, the
SPD is no longer in its ‘Normal’ state and contacts will be reversed.)
If the dry contacts are not utilized, insulate lead ends, coil and secure.
Audible Alarm will still function correctly.
Connecting Form C Dry
Contact & Audible Alarm
Figure 9: Leads
Dry Contact Leads
(18 AWG)
Blue
Grey
Red
• Normally Closed (suggested):
Use Gray and Red
• Normally Open:
Use Gray and Blue
Power Leads
(10 AWG)

© 2020 ASCO Power Technologies. All Rights Reserved 17
IO-70060
05/2020
For access to self-service tools and chat support visit se.com/us/en/work/support or call 1-888-778-2733 for technical assistance
ASCO 425 Surge Protective Device (SPD)
Wiring
Remote Monitor Option The remote monitor option has two LEDs, one red and one green, and an
audible alarm with an enable/disable switch. Normal status is a lit green
LED, and no audible alarm. To test the integrity of the remote monitor, press
the push-to-test switch. The green LED will turn o󰀨, the red LED will turn on,
and the alarm will sound, if the alarm is enabled. Releasing the switch will
complete the test; the red LED will turn o󰀨, the green LED will turn on and
the alarm will shut o󰀨.
If suppression on any phase is lost, the green LED will turn o󰀨, the red LED
will illuminate and an alarm will sound. The audible alarm can be silenced by
pushing the alarm enable/disable/test switch. The alarm will silence and the
green alarm LED will not be lit. The red LED will continue to be illuminated
until the inoperative condition has been cleared.
The remote monitor includes a 120 V ac to 12 V dc adapter with a six-foot
power cord. Connections are made to the ASCO 425 device via the dry con-
tact lead wires, connected directly into the remote monitor’s internal terminal
block. . To extend the remote monitor further (up to 1,000 ft. (305 m), use an
additional length of solid or stranded 22 to 14 AWG wire (not provided).

© 2020 ASCO Power Technologies. All Rights Reserved
18
IO-70060
05/2020
For access to self-service tools and chat support visit se.com/us/en/work/support or call 1-888-778-2733 for technical assistance
ASCO 425 Surge Protective Device (SPD)
Preventive Maintenance
Preventive Maintenance
HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH
• Apply appropriate personal protective equipment (PPE) and follow safe
electrical work practices. See NFPA 70E, NOM-029-STPS or CSA Z462.
• This equipment must only be installed and serviced by qualied electri-
cal personnel.
• Turn o󰀨 all power supplying this equipment before working on or inside
equipment.
• Always use a properly rated voltage sensing device to conrm power is
o󰀨.
• Replace all devices, doors and covers before turning on power to this
equipment.
• This equipment must be e󰀨ectively grounded per all applicable codes.
Use an equipment-grounding conductor to connect this equipment to the
power system ground.
Failure to follow these instructions will result in death or serious injury.
DANGER
Inspect the SPD periodically to maintain system performance and continued
transient voltage surge suppression. During this inspection, check the state
of the display LED status indicators.

© 2020 ASCO Power Technologies. All Rights Reserved 19
IO-70060
05/2020
For access to self-service tools and chat support visit se.com/us/en/work/support or call 1-888-778-2733 for technical assistance

IO-70060 RevH 05-20
While every precaution has been taken to ensure accuracy and
completeness in this literature, Schneider Electric assumes no
responsibility, and disclaims all liability for damages resulting from
use of this information or for any errors or omissions.
14550 58th Street North
Clearwater, Florida 33760
se.com/us/en/work/support
1-888-778-2733