EnerSys Alpha GMT 125 Series User manual

GMT 125 Series™/ KLM 125 Series™
1RU Fuse Panel For Telecom Broadband
Technical Manual
Effective: March 2021

2C048-742-30 R04, Rev. B (03/2021)
The following sections contain important safety information that must be followed during the installation and maintenance
of the equipment. Read all of the instructions before installing or operating the equipment, and save this manual for future
reference.
There may be multiple warnings associated with the call out. Example:
ATTENTION provides specic regulatory/code requirements that may a󰀨ect the placement of equipment and /or
installation procedures.
ATTENTION:
NOTICE provides additional information to help complete a specic task or procedure.
NOTICE:
ELECTRICAL HAZARD WARNING provides electrical safety information to PREVENT INJURY OR DEATH
to the technician or user.
WARNING! ELECTRICAL HAZARD
FUMES HAZARD WARNING provides fumes safety information to PREVENT INJURY OR DEATH to the
technician or user.
WARNING! FUMES HAZARD
FIRE HAZARD WARNING provides ammability safety information to PREVENT INJURY OR DEATH to the
technician or user.
WARNING! FIRE HAZARD
This WARNING provides safety information for both Electrical AND Fire Hazards
WARNING! ELECTRICAL & FIRE HAZARD
CAUTION provides safety information intended to PREVENT DAMAGE to material or equipment.
CAUTION!
GENERAL HAZARD WARNING provides safety information to PREVENT INJURY OR DEATH to the
technician or user.
WARNING! GENERAL HAZARD
Safety Notes
Alpha Technologies Services, Inc. considers customer safety and satisfaction its most important priority. To reduce the
risk of injury or death and to ensure continual safe operation of this product, certain information is presented di󰀨erently in
this manual. Alpha®tries to adhere to ANSI Z535 and encourages special attention and care to information presented in
the following manner:

3C048-742-30 R04, Rev. B (03/2021)
GMT 125 Series™/ KLM 125 Series™
1RU Fuse Panel For Telecom Broadband
Technical Manual
C048-742-30 R04, Rev. B
E󰀨ective: March 2021
©2021 by Alpha Technologies Services, Inc.
Disclaimer
Images contained in this manual are for illustrative purposes only. These images may not match your installation.
Operator is cautioned to review the drawings and illustrations contained in this manual before proceeding. If there are
questions regarding the safe operation of this powering system, please contact Alpha Technologies Services, Inc. or your
nearest Alpha representative.
Alpha® shall not be held liable for any damage or injury involving its enclosures, power supplies, generators, batteries or
other hardware if used or operated in any manner or subject to any condition not consistent with its intended purpose or is
installed or operated in an unapproved manner or improperly maintained.
Contact Information
Sales information and customer service in USA
(7AM to 5PM, Pacic Time): 1 800 322 5742
Complete Technical Support in USA
(7AM to 5PM, Pacic Time or 24/7 emergency support): 1 800 863 3364
Sales information and Technical Support in Canada: 1 888 462 7487
Website: www.alpha.com

4C048-742-30 R04, Rev. B (03/2021)
Table of Contents
1.0 Purpose and Applicability � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 5
1�1 Product Model � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 5
2.0 Theory of Operation � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 5
2�1 Introduction� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 5
2�1�1 GMT 125 Series� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 5
2�1�2 KLM 125 Series � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 5
2�2 Features � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 6
3.0 Unpacking and Inspection � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 6
3�1 Package Contents � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 6
4.0 Installation � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 7
4�1 Installation Preparation� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 7
4�1�1 Elevated Operating Ambient Temperature � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 7
4�1�2 Reduced Air Flow� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 7
4�1�3 Mechanical Loading� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 7
4�1�4 Circuit Overloading � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 7
4�1�5 Reliable Earthing � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 7
4�1�6 Disconnect Device � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 7
4�2 Mounting� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 8
4�2�1 Lacing Bar � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 8
4�2�2 Optional Rear Rack Support Kit� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 9
4�3 Chassis Ground � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 10
4�4 Input Connections� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 11
4�5 Output Connections � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 12
4�5�1 Terminal Block Output Versions� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 12
4�5�2 Connectorized Output Versions � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 13
4�6 Installing Fuses� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 13
4�7 Alarm Installation � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 13
4�8 Installation Checklist� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 14
5.0 Operation� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �15
5�1 Meter Module � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 15
5�1�1 Contrast Adjustment� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 15
5�1�2 Home Screen� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 15
5�1�3 Calibration and Settings� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 16
5�1�3�1 Reset Inventory � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 16
5.1.3.2 Bus Voltage O󰀨set � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 16
5�1�3�3 Bus Voltage Gain � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 16
5.1.3.4 Bus Current O󰀨set � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 16
5�1�3�5 Bus Current Gain � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 16
5�1�3�6 Audible Alarm � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 16
6.0 Product Specications � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �17
7.0 Models and Accessories � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �18
Appendix A: Mechanical Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
A�1 Front View � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 21
A�2 Rear View� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 22
A�3 Top View� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 23
A�4 Side View � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 24

5C048-742-30 R04, Rev. B (03/2021)
1.01.0 Purpose and ApplicabilityPurpose and Applicability
The purpose of this document is to detail the installation and operation instructions for the Alpha® GMT 125 Series™fuse
panel and KLM 125 Series™fuse panel�
1.11.1 Product ModelProduct Model
This document applies to the following models of the GMT 125 Series fuse panel and KLM 125 Series fuse panel
products:
Table 1. GMT 125 Series Fuse Panel Congurations
PART NUMBER DESCRIPTION INPUTS OUTPUTS MONITORING
C016-1871-10 GMT 125 Series Fuse Panel, -48VDC,
10A/10B GMT Fuse Positions
Dual-Input Terminal Block LED Indicators
C016-1875-10 GMT 125 Series Fuse Panel, -48VDC,
10A/10B GMT Fuse Positions
Dual-Input Terminal Block Meter Module
C016-1873-10 GMT 125 Series Fuse Panel, -48VDC,
10A/10B GMT Fuse Positions
Dual-Input Connectorized LED Indicators
C016-1877-10 GMT 125 Series Fuse Panel, -48VDC,
10A/10B GMT Fuse Positions
Dual-Input Connectorized Meter Module
Table 2. KLM 125 Series Fuse Panel Congurations
PART NUMBER DESCRIPTION INPUTS OUTPUTS MONITORING
C016-1846-10 KLM 125 Series Fuse Panel, -48VDC, 4A/4B
KLM Fuse Positions, 4A/4B GMT Fuse
Positions
Dual-Input Terminal Block LED Indicators
C016-1847-10 KLM 125 Series Fuse Panel, -48VDC, 4A/4B
KLM Fuse Positions, 4A/4B GMT Fuse
Positions
Dual-Input Terminal Block Meter Module
C016-1848-10 KLM 125 Series Fuse Panel, -48VDC, 4A/4B
KLM Fuse Positions, 4A/4B GMT Fuse
Positions
Dual-Input Connectorized LED Indicators
C016-1849-10 KLM 125 Series Fuse Panel, -48VDC, 4A/4B
KLM Fuse Positions, 4A/4B GMT Fuse
Positions
Dual-Input Connectorized Meter Module
2.02.0 Theory of OperationTheory of Operation
2.12.1 IntroductionIntroduction
2.1.12.1.1 GMT 125 SeriesGMT 125 Series
The GMT 125 Series product family consists of a dual-input 10A/10B GMT fuse position, 1RU panel with optional
connectorized outputs and meter module� GMT fuses are available for this panel in ratings starting with 1/64 ampere up
to 20 ampere rating�
2.1.22.1.2 KLM 125 SeriesKLM 125 Series
The KLM 125 Series product family consists of a dual-input 4A/4B GMT and 4A/4B KLM fuse position, 1RU panel with
optional connectorized outputs and meter module�
The bus rating is 125 amperes max per bus� GMT fuses are available for this panel in ratings starting with 1/64 ampere up
to 15 ampere rating� KLM fuses are available for this panel in ratings starting with 1 ampere up to 30 ampere rating�

6C048-742-30 R04, Rev. B (03/2021)
2.22.2 FeaturesFeatures
GMT 125 Series
yGMT fuse positions: 20; each available up to 20A max
KLM 125 Series
yGMT fuse positions: 8; each available up to 15A max
yKLM fuse positions: 8; each available up to 30A max
All Models
yRack mounting: 19 in� or 23 in� via reversible rack mount ears
yMounting o󰀨set: Front-ush, mid-mount forward, mid-mount rearward
yLED indicators (panels with standard bezel)
yAdvanced LCD display (panels with meter module)
yAlarm contacts: Form C dry contacts
yRear panel modular jack connections for alarm outputs
yFuse distribution output terminals: set screw terminals support 10-22 AWG wires terminated with a narrow ring or
spade lug (0�25 in� max width)
yOptional positive latching connectorized output connections
3.03.0 Unpacking and InspectionUnpacking and Inspection
The GMT 125 Series/KLM 125 Series fuse panel was carefully packaged at the factory to withstand the normal rigors
of shipping. However, you should carefully inspect the box and contents to conrm that no damage has occurred in
transit. Most shipping carriers require notication of shipping damage within twenty-four hours of delivery, and it is the
responsibility of the recipient to inspect the shipment immediately upon receipt�
3.13.1 Package ContentsPackage Contents
Included with your product are the following items:
yGMT 125 Series/KLM 125 Series fuse panel
yMounting hardware kit with necessary screws and washers
yCable lacing bar (models with connectorized outputs only)

7C048-742-30 R04, Rev. B (03/2021)
4.04.0 InstallationInstallation
4.14.1 Installation PreparationInstallation Preparation
When selecting an installation location, ensure that all of the
following conditions are met before proceeding�
4.1.14.1.1 Elevated Operating Ambient TemperatureElevated Operating Ambient Temperature
If you install the panel in a closed or multi-unit rack assembly, the
operating ambient temperature of the rack environment may be
greater than room ambient� Therefore, take care to install the
equipment in an environment compatible with the maximum ambient
temperature (TMA) specied in Section 6.
4.1.24.1.2 Reduced Air FlowReduced Air Flow
Installation of the equipment in a rack should be such that the
amount of air ow required for safe operation of the equipment is not
compromised�
4.1.34.1.3 Mechanical LoadingMechanical Loading
Mounting of the equipment in the rack should be such that a
hazardous condition is not achieved due to uneven mechanical
loading�
4.1.44.1.4 Circuit OverloadingCircuit Overloading
Give consideration to the connection of the equipment to the
supply circuit and the e󰀨ect that overloading of the circuits might
have on overcurrent protection and supply wiring� Use appropriate
consideration for equipment nameplate ratings when addressing this
concern�
4.1.54.1.5 Reliable EarthingReliable Earthing
Maintain reliable earthing of rack-mounted equipment� Pay particular
attention to supply connections other than direct connections to the
branch circuit (e�g�, use of power strips)�
4.1.64.1.6 Disconnect DeviceDisconnect Device
A readily accessible disconnect device must be incorporated in the
building installation wiring�

8C048-742-30 R04, Rev. B (03/2021)
4.24.2 MountingMounting
THIS PRODUCT MUST BE INSTALLED WITHIN A
RESTRICTED ACCESS LOCATION WHERE ACCESS IS
THROUGH THE USE OF A TOOL, LOCK AND KEY, OR
OTHER MEANS OF SECURITY, AND IS CONTROLLED BY
THE AUTHORITY RESPONSIBLE FOR THE LOCATION�
THIS PRODUCT MUST BE INSTALLED AND MAINTAINED
ONLY BY QUALIFIED TECHNICIANS�
NOTICE:
Step 1. Select the equipment rack location for installation of the fuse
panel� Orient the rack mount ears appropriately for either 19
in. or 23 in. rack and select either the front-ush mount, mid-
mount forward, or mid-mount rearward position to install the
mounting ears (see Figure 1)�
Step 2. Attach the mounting ears with included 10-32 hardware (see
Figure 2)� Depending on the attachment point selected, the
panel will either be front-ush, mid-mount forward, or mid-
mount rearward in the rack�
Step 3. Secure panel to equipment rack by tightening the included
12-24 hardware into the mounting ears�
4.2.14.2.1 Lacing BarLacing Bar (Connectorized Output Models Only)(Connectorized Output Models Only)
GMT 125 Series/KLM 125 Series product models with connectorized
outputs include an output cable lacing bar for clean cable
management� This lacing bar does not come preinstalled from the
factory�
Step 1. Attach the output cable lacing bar by tightening the two 10-32
Phillips®head screws into the threaded holes located on the
rear of the panel (see Figure 3)�
Figure 1. Mounting ear positions
Figure 2. Mounting ears
(front-ush position shown)
Figure 3. Lacing bar
(connectorized models only)

9C048-742-30 R04, Rev. B (03/2021)
4.2.24.2.2 Optional Rear Rack Support KitOptional Rear Rack Support Kit
(C750-278-10 Kit; For Connectorized Output Models Only)(C750-278-10 Kit; For Connectorized Output Models Only)
An optional rear rack support kit is available for GMT 125 Series/
KLM 125 Series product models with connectorized output
congurations. This kit provides additional support to the rear
of the panel by attaching to the rear of the equipment rack� The
adjustable rails and lacing bar allow for exible and clean cable
management�
NOTE: This kit can not be used in combination with the standard
cable lacing bar that is included with connectorized fuse panels�
Step 1. Insert the cable lacing pole into the adjustment blocks,
then tighten the black phillips-head screws (see Figure 4)�
Step 2. Insert the two straight panel extension poles into the
bottom holes of the adjustment blocks (see Figure 5)�
Step 3. Insert the two rear rack mounting poles into the top holes
of the adjustment blocks (see Figure 6)�
Step 4. Secure the base of the two straight panel extension poles
from Step 2 to the threaded holes found on the rear of the
fuse panel chassis by tightening the hex-head hardware
(see Figure 7)�
Step 5. Secure the rear rack mount ears to the equipment rack by
tightening the 1/4 in� Phillips head screws (see Figure 8)�
Step 6. Secure the cable lacing bar into place by tightening the
thumbscrews found on the top of the adjustment blocks
(see Figure 9)�
Figure 4. Cable lacing bar
Figure 5. Panel extension poles
Figure 6. Rear rack mounting poles
Figure 7. Mount to chassis Figure 8. Rear rack mount ears Figure 9. Thumbscrew

10 C048-742-30 R04, Rev. B (03/2021)
4.34.3 Chassis GroundChassis Ground
DO NOT ENERGIZE THE PANEL BEFORE CHASSIS
GROUND IS CONNECTED�
CAUTION!
The chassis ground is located in the side of the panel� A two hole
lug landing position is provided� See table below for termination
information� A minimum of #6 AWG chassis ground cable is required�
IMPORTANT: Grounding hardware not included� A properly-sized
grounding conductor must be installed per NEC (250�122)�
Table 3. Chassis Ground Termination Specications
TERMINATION
TYPE
HOLE/
STUD SIZE
CENTER
TO CENTER
RECOMMENDED
TORQUE VALUE
Threaded Insert 1/4 in� 5/8 in� 5.83 ft∙lbs
Step 1. Secure the ground cable to the chassis by tightening 1/4 in�
hardware (see Figure 10)� Figure 10. Chassis Ground

11 C048-742-30 R04, Rev. B (03/2021)
4.44.4 Input ConnectionsInput Connections
WARNING! ELECTRICAL HAZARD
INPUTS MUST BE PROTECTED BY A LISTED CIRCUIT
BREAKER OR BRANCH RATED FUSE� THE CIRCUIT
BREAKER OR FUSE MUST BE RATED 125A MAX�
MULTIPLE POWER SOURCES ARE PRESENT,
ENSURE ALL INPUT POWER FEEDS ARE NOT
ENERGIZED BEFORE INSTALLING THEM� ELECTRICAL
INSTALLATION SHOULD ONLY BE PERFORMED BY
QUALIFIED PERSONNEL WITH PROPER TOOLS AND
PROTECTIVE SAFETY EQUIPMENT�
MAKE SURE THAT ALL FEEDER CABLES HAVE HEAT
SHRINK APPLIED PRIOR TO TERMINATION, AND THAT
NO-OXIDE COMPOUND IS APPLIED TO ALL COPPER-
TO-COPPER CONNECTIONS� REFER TO SECTION 7
FOR COMPRESSION LUG SPECIFICATIONS, TOOLING,
AND ORDERING INFORMATION�
NOTICE:
Table 4. Input Termination Specications
TERMINATION
TYPE
HOLE/
STUD SIZE
CENTER
TO CENTER
RECOMMENDED
TORQUE VALUE
Threaded Stud 1/4 in� 5/8 in� 4.17 ft∙lbs
Step 1. Remove the plastic input safety covers by pulling away from
panel (see Figure 11)�
Step 2. Install the return cables/lugs to the return input studs located
on the rear of the panel (see Figure 12)� Ensure all that
hardware is tightened�
Step 3. Install the hot input cables/lugs to the hot input studs located
on the rear of the panel (see Figure 13)� Ensure that all
hardware is tightened�
Step 4. Reinstall the input safety covers from Step 1�
WARNING! ELECTRICAL HAZARD
FAILURE TO REINSTALL THE INPUT SAFETY COVERS
WILL CREATE AN ELECTRICAL HAZARD�
Figure 11. Input Safety Covers
Figure 12. Return Input Landing
Figure 13. Hot Input Landing

12 C048-742-30 R04, Rev. B (03/2021)
4.54.5 Output ConnectionsOutput Connections
DO NOT PERFORM THIS STEP ON CIRCUITS
WITH FUSES INSTALLED� ENSURE NO POWER IS
PRESENT ON THE CIRCUIT BEING WIRED BEFORE
PROCEEDING� MAKE SURE THAT ALL CABLES HAVE
INSULATED TERMINALS OR HEAT SHRINK APPLIED
PRIOR TO TERMINATION, AND THAT NO-OXIDE
COMPOUND IS APPLIED TO ALL COPPER-TO-COPPER
CONNECTIONS�
CAUTION!
REFER TO SECTION 7 FOR TERMINAL
SPECIFICATION, TOOLING, AND ORDERING
INFORMATION�
NOTICE:
4.5.14.5.1 Terminal Block Output VersionsTerminal Block Output Versions
Table 5. Output Termination Specications
TERMINATION
TYPE
HOLE/
STUD
SIZE
CENTER
TO
CENTER
RECOMMENDED
TORQUE VALUE
Screw Terminal M3 (#6) 1/4 in� 5 in∙lbs
Refer to the front of the panel for the channel mapping card� On the
rear of the panel, locate the “stair-step” terminal block for the fused
outputs� Note that each output terminal is numbered from right to left
to correspond with the fuse holder on the front panel� The bottom
terminals in the terminal block are connected to the return bus bar
for each input bus� The top row of terminals are the fused outputs for
each fuse holder as numbered�
Step 1. Connect the wires to the equipment loads to be fed by the
panel fused outputs to these terminal block connections� The
RTN (+) wire connects to the bottom terminal (see Figure 14)
and the HOT (-) wire connects to the top terminal (see Figure
15) for each fuse position�
Step 2. Use appropriate crimp spade or ring lugs on the wires that will
be connected to the terminal block fused outputs� Ensure no
stray wire strands short out to adjacent terminals, and route
the wires in an organized fashion with cable ties or lacing
twine down the equipment rack to the equipment loads�
Step 3. Attach the included output safety cover by snapping it onto
the pre-tightened mounting screws (see Figure 16)�
WARNING! ELECTRICAL HAZARD
FAILURE TO REINSTALL THE INPUT SAFETY COVERS
WILL CREATE AN ELECTRICAL HAZARD�
Figure 14. RTN output wires
Figure 15. HOT output wires
Figure 16. Output safety cover

13 C048-742-30 R04, Rev. B (03/2021)
4.5.24.5.2 Connectorized Output VersionsConnectorized Output Versions
There are 20 positive latching DC connector positions for the output
circuits found on the GMT 125 Series fuse panel (10 per side) and
there are 16 positive latching DC connector positions for the output
circuits found on the KLM 125 Series fuse panel (8 per side)� Cable
whips are available in a variety of lengths and wire gauges (see
Section 7)� Refer to the front of the panel for the channel mapping
card for circuit mapping information�
Step 1. Insert the DC connectors into the outputs until they click� The
connectors are keyed to ensure correct polarity (see Figure
17)�
4.64.6 Installing FusesInstalling Fuses
USE BUSSMANN®GMT TYPE FUSES ONLY� FUSES
MUST CARRY A 450A INTERRUPT RATING�
NOTICE:
Step 1. Ensure that connected loads are in the o󰀨 position, then insert
a fuse of su󰀩cient ampacity into the position to be fed. Turn
on the connected load�
4.74.7 Alarm InstallationAlarm Installation
WHEN DAISY CHAINING, THE ALARM MUST BE
MONITORED NORMALLY OPEN�
NOTICE:
The GMT 125 Series/KLM 125 Series fuse panel has Form-C dry
alarm contacts for remote alarm monitoring� If alarm monitoring is
required, (2) 8p8c (RJ-45) modular jacks are provided for alarm
connections� The (2) jacks support easy daisy chaining of panels�
The 8p8c modular jacks are located on the center rear of the panel�
Refer to mechanical drawings found in Appendix A for more details�
Step 1. Plug in a UTP cable with a TIA/EIA T568B termination into the
alarm jack (see Figure 18)� Refer to Table 6 for termination
pinout information�
Step 2. Connect the cable to the site alarm monitoring system�
Step 3. If daisy chaining is required, connect a UTP cable with TIA/
EIA T568B termination into the second jack and connect the
other end to the next panel in the chain� Repeat this process
until all panels are connected�
Table 6. Alarm Contact Pinout
PIN 1 PIN 2 PIN 3 PIN 4 PIN 5 PIN 6 PIN 7 PIN 8
Major
COM
Major
NC
Major
NO
Reserved Reserved Reserved Reserved Reserved
Figure 17. Connectorized output cables
Figure 18. Alarm jacks

14 C048-742-30 R04, Rev. B (03/2021)
4.84.8 Installation ChecklistInstallation Checklist
yRack mount ears congured for 19/23 in.
yEars mounted to panel and rack securely
yInput power cables/lug and return cables/lugs securely bolted/
connected to rear of panel
yHeat shrink installed on cables
yFused outputs wired with correct polarity, crimp lugs, wire lacing,
or cable tie routing to equipment loads
yOutput connections secured
yFuses sized as required for each load
yAll safety covers attached

15 C048-742-30 R04, Rev. B (03/2021)
5.05.0 OperationOperation
5.15.1 Meter ModuleMeter Module
The GMT 125 Series/KLM 125 Series fuse panel is available with an optional meter module for monitoring of voltage,
current, and alarms�
5.1.15.1.1 Contrast AdjustmentContrast Adjustment
The screen contrast can be adjusted by inserting a #00 screwdriver into the recessed contrast button
(view meter module illustration above for button locations)�
5.1.25.1.2 Home ScreenHome Screen

16 C048-742-30 R04, Rev. B (03/2021)
5.1.35.1.3 Calibration and SettingsCalibration and Settings
To enter the Calibration and Settings Menu, press the Select (Sel) button� To advance through each item on the menu,
press the Select (Sel) button� NOTE: Any changes are not saved until you have advanced back to the Home Screen�
5.1.3.15.1.3.1 Reset InventoryReset Inventory
For panels with KLM fuse positions, the meter module keeps track of KLM fuse inventory in order to report fuse status�
Any installed KLM fuses are detected and added to the inventory automatically� When a fuse is removed, however, the
inventory must be reset to clear the fuse fail alarm� Press the (+) button to reset the KLM fuse inventory� The meter will
return to the Home Screen immediately, skipping the calibration screens� Press Sel to advance to the next setting�
5.1.3.25.1.3.2 Bus Voltage O󰀨setBus Voltage O󰀨set
A and B bus voltage o󰀨set can be adjusted by pressing the (+) or (-) buttons. The measured bus voltage is shown in
hundredths of volts along with the applied o󰀨set. Press Sel to advance to the next setting.
5.1.3.35.1.3.3 Bus Voltage GainBus Voltage Gain
A and B bus voltage gain can be adjusted by pressing the (+) or (-) buttons� The measured voltage is shown in hundredths
of volts along with the applied gain� Press Sel to advance to the next setting�
5.1.3.45.1.3.4 Bus Current O󰀨setBus Current O󰀨set
A and B bus current o󰀨set can be adjusted by pressing the (+) or (-) buttons. The measured load is shown in tenths of
amps alng with the applied o󰀨set. Press Sel to advance to the next setting.
5.1.3.55.1.3.5 Bus Current GainBus Current Gain
A and B bus current gain can be adjusted by pressing the (+) or (-) buttons� The measured load is shown in tenths of
amps along with the applied gain� Press Sel to advance to the next setting�
5.1.3.65.1.3.6 Audible AlarmAudible Alarm
Audible alarm can be enabled (EN) or disabled (DIS) by pressing the (+) or (-) buttons� Press Sel to return to the Home
Screen� NOTE: The audible alarm is disabled by default�

17 C048-742-30 R04, Rev. B (03/2021)
6.06.0 Product SpecicationsProduct Specications
Table 7. GMT 125 Series Fuse Panel Specications
ALL MODELS
Type of Input Dual Input (A/B)
Circuits 10 (10A/10B)
Input Voltage (+/- 0%) -42 to -60V DC
Input Current 125A Max
Maximum Input Interruption Device 150A
Maximum Fuse Size 20A GMT
Maximum Per Circuit Current 20A
Maximum Continuous Load on 15-20A GMT Fuses 70% Fuse Rating
Maximum Continuous Load on <15A GMT Fuses 80% Fuse Rating
Max Operating Altitude 2000 m
Max Ambient Temperature 45º C
Width 17 in�
Height 1�75 in�
Depth (Not Including Lacing Bar Kits) 11 in�
Weight 8�5 lbs�
UL File Number E473904
UL Standard ANSI/UL 60950-1
Table 8. KLM 125 Series Fuse Panel Specications
ALL MODELS
Type of Input Dual Input (A/B)
Circuits 16 (8A/8B)
Input Voltage (+/- 0%) -42 to -60V DC
Input Current 125A Max
Maximum Input Interruption Device 150A
Maximum Fuse Size 30A KLM; 15A GMT
Maximum Per Circuit Current 30A KLM; 15A GMT
Maximum Continuous Load on 15-20A GMT Fuses 70% Fuse Rating
Maximum Continuous Load on <15A GMT Fuses 80% Fuse Rating
Max Operating Altitude 2000 m
Max Ambient Temperature 55º C
Width 17 in�
Height 1�75 in�
Depth (Not Including Lacing Bar Kits) 11�5 in�
Weight 8�5 lbs�
UL File Number E473904
UL Standard ANSI/UL 60950-1

18 C048-742-30 R04, Rev. B (03/2021)
7.07.0 Models and AccessoriesModels and Accessories
Table 9. GMT 125 Series Fuse Panel Model Congurations
DESCRIPTION PART NUMBER
GMT 125 Series Fuse Panel; 125A; 1RU; Dual Input; 10A/10B - 20A Max; LED Indicators;
Terminal Block Outputs
C016-1871-10
GMT 125 Series Fuse Panel; 125A; 1RU; Dual Input; 10A/10B - 20A Max; Meter Module;
Terminal Block Outputs
C016-1875-10
GMT 125 Series Fuse Panel; 125A; 1RU; Dual Input; 10A/10B - 20A Max; LED Indicators;
Connectorized Outputs
C016-1873-10
GMT 125 Series Fuse Panel; 125A; 1RU; Dual Input; 10A/10B - 20A Max; Meter Module;
Connectorized Outputs
C016-1877-10
Table 10. KLM 125 Series Fuse Panel Model Congurations
DESCRIPTION PART NUMBER
KLM 125 Series Fuse Panel; 125A; 1RU; Dual Input; 4A/4B KLM Fuses; 4A/4B GMT Fuses;
30A Max KLM Fuse; 15A Max GMT Fuse; LED Indicators; Terminal Block Outputs
C016-1846-10
KLM 125 Series Fuse Panel; 125A; 1RU; Dual Input; 4A/4B KLM Fuses; 4A/4B GMT Fuses;
30A Max KLM Fuse; 15A Max GMT Fuse; Meter Module; Terminal Block Outputs
C016-1847-10
KLM 125 Series Fuse Panel; 125A; 1RU; Dual Input; 4A/4B KLM Fuses; 4A/4B GMT Fuses;
30A Max KLM Fuse; 15A Max GMT Fuse; LED Indicators; Connectorized Outputs
C016-1848-10
KLM 125 Series Fuse Panel; 125A; 1RU; Dual Input; 4A/4B KLM Fuses; 4A/4B GMT Fuses;
30A Max KLM Fuse; 15A Max GMT Fuse; Meter Module; Connectorized Outputs
C016-1849-10
Table 11. Accesories
DESCRIPTION PART NUMBER
Rear Rack Mounting Kit; GMT 125 C750-278-10
Table 12. Supported Lugs for Input Connections
WIRE GAUGE
SUPPORTED
ALPHA PART
NUMBER
MANUFACTURER MANUFACTURER
PART NUMBER
CRIMP DIE REQUIRED
#2 AWG C538-173-10 BURNDY® YAV2CL2NT14FX Burndy U2CRT, W2CVT,
W2CRT, X2CRT
#2 AWG
(90 degree)
C538-275-10 BURNDY® YAV2CL2NT14FX90 Burndy U2CRT, W2CVT,
W2CRT, X2CRT
1/0 C538-260-10 BURNDY® YAZV252NT14FX Burndy U25RT, W25VT, W25RT,
X25RT
1/0
(90 degree)
C538-289-10 BURNDY® YAV25L2NT14FX90 Burndy U25RT, W25VT, W25RT,
X25RT
Table 13. Supported Lugs for Chassis Ground Connections
WIRE GAUGE
SUPPORTED
ALPHA PART
NUMBER
MANUFACTURER MANUFACTURER
PART NUMBER
CRIMP DIE REQUIRED
#6 AWG C538- 094-10 BURNDY® YAZV6C2TC14FX Burndy U5CRT, W5CRT,
W5CV T, X5CRT, Y1MRTC
Table 14. Supported GMT Fuses
DESCRIPTION PART NUMBER
GMT Fuse ¼A; 60VDC; violet ag C460- 014-10
GMT Fuse ½A; 60VDC; reg ag C460- 042-10
GMT Fuse 1A; 60VDC; gray ag C460- 013-10
GMT Fuse 2A; 60VDC; orange ag C460-026-10
GMT Fuse 3A; 60VDC; blue ag C460-027-10
GMT Fuse 4A; 60VDC; white/brown ag C460- 028-10

19 C048-742-30 R04, Rev. B (03/2021)
DESCRIPTION PART NUMBER
GMT Fuse 5A; 60VDC; green ag C460-009-10
GMT Fuse 7.5A; 60VDC; black/white ag C460- 012-10
GMT Fuse 10A; 60VDC; red/white ag C460-010-10
GMT Fuse 15A; 60VDC; red/blue ag C 46 0 - 011-10
GMT Fuse 20A; 60VDC; green/white ag C460 - 041-10*
*Not applicable for KLM 125 Series models
Table 15. Supported KLM Fuses
DESCRIPTION PART NUMBER
KLM Fuse 1A; 600VDC C460-089-10
KLM Fuse 2A; 600VDC C460- 088-10
KLM Fuse 3A; 600VDC C460-087-10
KLM Fuse 5A; 600VDC C460- 085 -10
KLM Fuse 7A; 600VDC C460-086-10
KLM Fuse 10A; 600VDC C460- 082-10
KLM Fuse 15A; 600VDC C460- 084-10
KLM Fuse 20A; 600VDC C460- 081-10
KLM Fuse 25A; 600VDC C460- 083-10
KLM Fuse 30A; 600VDC C460-080-10
Table 16. Connectorized Cable Assemblies (For Connectorized Models Only)
AWG LENGTH COLOR PART NUMBER
#10 7’ Red/Black C745 - 420 -10
Blue/Black C745 - 422-10
Red/Red Tracer C745-437-10
Blue/Blue Tracer C745-433-10
12’ Red/Black C745 -290 -10
Blue/Black C745 - 424 -10
Red/Red Tracer C745-438-10
Blue/Blue Tracer C745-434-10
#12 7’ Red/Black C745 - 421-10
Blue/Black C745-425-10
Red/Red Tracer C745-298 -10
Blue/Blue Tracer C745-299-10
12’ Red/Black C745 -293-10
Blue/Black C745 -294-10
Red/Red Tracer C745-197-10
Blue/Blue Tracer C745-198-10
#14 7’ Red/Black C745-436-10
Blue/Black C745 - 427-10
Red/Red Tracer C745-432-10
Blue/Blue Tracer C745-435-10
12’ Red/Black C745 -296 -10
Blue/Black C745 - 429 -10
Red/Red Tracer C745-227-10
Blue/Blue Tracer C745-228 -10

20 C048-742-30 R04, Rev. B (03/2021)
Table 17. Output Terminals (For Terminal Block Models Only)
WIRE GAUGE
SUPPORTED;
TERMINAL TYPE
ALPHA PART
NUMBER
MANUFACTURER MANUFACTURER
PART NUMBER
CRIMP DIE REQUIRED
#16-14 AWG; Ring
Terminal
C538-068-10 TE CONNECTIVITY®34158 TE Connectivity 58433-3 with
Die Assembly 58423-1
#10-12 AWG Ring
Terminal
C538-280-10 TE CONNECTIVITY®329697 TE Connectivity 169400 with
Die Assembly 169404
#16-14 AWG; Spade
Terminal
C538-038-10 TE CONNECTIVITY®52955 TE Connectivity 58433-3 with
Die Assembly 58423-1
#12-10 AWG; Spade
Terminal
C538-119-10 TE CONNECTIVITY®52961 TE Connectivity 58433-3 with
Die Assembly 58423-1