Amphenol 125GMT Series User manual

125GMT10/125GMT15
Installation Guide

2
125GMT
Amphenol Network Solutions
All rights reserved. 3.18.20 150566
509.926.6000 —amphenol-ns.com.com
Installation Guide, Part Number 150566 A0
Copyright 2020, Amphenol Network Solutions, All rights reserved.
Amphenol Network Solutions
22425 E. Appleway Ave #11
Liberty Lake, WA 99019
Amphenol Network Solutions assumes no liability from the application or use of these products.
Amphenol Network Solutions does not convey any license under its patent rights nor the patent
rights of others. This document and the products described herein are subject to change without notice.
About
Amphenol Network Solutions is a global innovative original equipment manufacturer that serves the data
and communications markets. We design, manufacture, and distribute products for customers who need an
end to end solution for network connectivity, fiber, power distribution and rack management. We collaborate
with our customers to deliver product solutions that exceed expectations with innovative designs and world
class quality. Amphenol Network Solutions is the industry thought leader on network cable management.
Telect, Inc. has been a market leader in secondary DC power distribution
for over 36 years. Through our acquisition by Amphenol and our merger
with All Systems Broadband, to become Amphenol Network Solutions, we
have continued to deliver reliable, high-quality solutions to power, protect,
and monitor today’s network servers and equipment. We are proud to be
an Amphenol company that will continue to be Powered by Telect.
Technical Support
Email: [e-mail]
Phone: [phone]

3
125GMT
Amphenol Network Solutions
All rights reserved. 3.18.20 150566
509.926.6000 —amphenol-ns.com.com
Table of Contents
Section One: Overview................................................................................................................................ 5
1.1 About this Guide..............................................................................................................................5
1.2 125GMT Configurations................................................................................................................... 6
1.3 125GMT Overview...........................................................................................................................6
1.4 Specifications................................................................................................................................... 8
Section Two: Installation.............................................................................................................................. 9
2.1 Important Installation Guidelines...................................................................................................... 9
2.2 Installation Instructions ....................................................................................................................9
2.2.1 Mounting brackets................................................................................................................ 10
2.2.2 Optional tie bar installation (Connectorized panels only)...................................................... 10
2.2.3 Rack mounting..................................................................................................................... 11
2.2.4 Grounding............................................................................................................................ 12
2.2.5 Input Wiring.......................................................................................................................... 13
2.2.6 Remove alarm cover............................................................................................................ 14
2.2.7 Alarming .............................................................................................................................. 14
2.2.8 Installing fuses..................................................................................................................... 15
2.2.9 Alarm Terminals................................................................................................................... 15
2.2.10 Output wiring (Terminal block versions)............................................................................. 16
2.2.11 Output wiring (Connectorized versions) ............................................................................. 17
2.2.12 Install rear cover ................................................................................................................ 19
2.3 Tie Bar........................................................................................................................................... 20
2.4 Parts & Accessories....................................................................................................................... 20
2.4.1 Ordering Information............................................................................................................ 21
2.4.2 GMT Fuses.......................................................................................................................... 21
2.4.3 Lug Reference Guide........................................................................................................... 22
Section Three: Drawings ........................................................................................................................... 23
3.1 125GMT Drawings......................................................................................................................... 23
List of Figures
Fig. 1-1: 125GMT15 front view .................................................................................................................... 6
Fig. 1-2: 125GMT15 rear view.....................................................................................................................6
Fig. 1-3: 125GMT10-C front view................................................................................................................. 7
Fig. 1-4: 125GMT10-C rear view .................................................................................................................7
Fig. 2-1: Installing mounting brackets ........................................................................................................ 10

4
125GMT
Amphenol Network Solutions
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Fig. 2-2: Installing optional tie bar.............................................................................................................. 10
Fig. 2-3: Installing panel in rack................................................................................................................. 11
Fig. 2-4: Grounding lug connection............................................................................................................ 12
Fig. 2-5: Input lugs..................................................................................................................................... 13
Fig. 2-6: Removing the alarm cover........................................................................................................... 14
Fig. 2-7: 125GMT15 LED status................................................................................................................ 14
Fig. 2-8: 125GMT15-C Alarm Terminals.................................................................................................... 15
Fig. 2-9: Output lugs.................................................................................................................................. 16
Fig. 2-10: Insert crimped terminals ............................................................................................................ 17
Fig. 2-11: Connector front view.................................................................................................................. 17
Fig. 2-12: Insert retainer ............................................................................................................................ 17
Fig. 2-13: Insert Connector........................................................................................................................ 18
Fig. 2-14: Rear Cover................................................................................................................................ 19
Fig. 2-15: Optional Tie Bar......................................................................................................................... 20
Fig. 3-1: 125GMT10 and 125GMT10-C Front view.................................................................................... 23
Fig. 3-2: 125GMT15 and 125GMT15-C Front view.................................................................................... 23
Fig. 3-3: 125GMT10, 125GMT15, 125GMT10-C and 125GMT15-C Side view.......................................... 23
Fig. 3-4: 125GMT10 Rear view.................................................................................................................. 24
Fig. 3-5: 125GMT15 Rear view.................................................................................................................. 24
Fig. 3-6: 125GMT10-C Rear view.............................................................................................................. 24
Fig. 3-7: 125GMT15-C Rear view.............................................................................................................. 24
Fig. 3-8: 125GMT10 and 125GMT15 Bottom view..................................................................................... 24
Fig. 3-9: 125GMT10-C and 125GMT15-C Bottom view ............................................................................. 24
Fig. 3-10: 125GMT10-C and 125GMT15-C with optional Tie Bar............................................................... 24

5
125GMT
Amphenol Network Solutions
All rights reserved. 3.18.20 150566
509.926.6000 —amphenol-ns.com.com
Section One: Overview
1.1 About this Guide
This manual provides a comprehensive overview of and installation guidelines for the 125GMT family of power
distribution panels. While care has been taken to define all necessary information, complete details may not be
covered. If you have any questions, contact Amphenol Network Solutions Technical Support at
[e-mail] or call 1-509-926-6000.
Throughout this guide, select information is highlighted in the form of Notes, Alerts, Cautions, and Warnings.
These notifications are prominent, and their importance is indicated as follows:
NOTE: General information to which the user should pay special attention.
ALERT! Important information and/or instructions to which the user should adhere.
CAUTION! Indicates a hazardous situation, which could result in minor or moderate injury.
WARNING! Indicates a hazardous situation, which could result in death or serious injury.
Amphenol Network Solutions assumes no liability from the application or use of these products. Amphenol
Network Solutions does not convey a license under its patent rights, nor the patent rights of others. This
document and the products described herein are subject to change without notice.

6
125GMT
Amphenol Network Solutions
All rights reserved. 3.18.20 150566
509.926.6000 —amphenol-ns.com.com
1.2 125GMT Configurations
GMT Fuse Panel
Part Number:
125A Dual-Feed, 10/10 Panel, Horizontal Inputs, Output Terminal Blocks
125GMT10
125A Dual-Feed, 10/10 Panel, Horizontal Inputs, Connectorized Outputs
(Connectors purchased separately)
125GMT10-C
125A Dual-Feed, 15/15 Panel, Horizontal Inputs, Output Terminal Blocks
125GMT15
125A Dual-Feed, 15/15 Panel, Horizontal Inputs, Connectorized Outputs
(Connectors purchased separately)
125GMT15-C
1.3 125GMT Overview
The Amphenol Network Solutions 125GMT family of 1RU, dual-feed 125A per feed, power distribution panels
provide high-capacity, ±48V, ±24V, and ±12V power protection for secondary power distribution to data and
communications equipment. The Amphenol Network Solutions 125GMT family panels are also ideal for
primary distribution in small central offices and at remote sites.
Fig. 1-1: 125GMT15 front view
Fig. 1-2: 125GMT15 rear view

7
125GMT
Amphenol Network Solutions
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509.926.6000 —amphenol-ns.com.com
This panel accommodates Cooper Bussmann and Littelfuse GMT fuses. The 125GMT10 and 125GMT15 have
positions for 20 or 30 GMT fuses, respectively. The panel is UL rated using 20A GMT fuses with a maximum
continuous output load of 14A. GMT fuses are sold separately. See amphenol-ns.com to order GMT fuses.
Sides A and B are electrically isolated including the alarm card, which contains power and GMT fuse status
relays with dry, Form-C contacts. The contacts are connected to wire-wrap pins for connecting to external
visual/audio alarms. Pins can also mate to a TE Connectivity 3-640428-3 connector. The alarm card also
controls the four indicator LEDs on the front panel.
The feed inputs are horizontal and accommodate dual-hole lugs. The input terminals are studs. This panel is
available with standard terminal block outputs or connectorized outputs. All input, output and alarm terminals
are within the panel.
For the terminal block configurations, the outputs are staggered to accommodate waterfall cable management.
Outputs accommodate single-hole lugs and the output terminals are screws.
For the connectorized output configurations, the output cables exit straight back from the panel. The outputs
accommodate connectors that are easily assembled during installation.
The ground terminals can accommodate either dual-hole or single-hole lugs. The ground terminals are bolt
connections on the sides of the panel, near the rear, and on the bottom of the panel, near the center rear. Only
one ground connection is required.
Fig. 1-3: 125GMT10-C front view
Fig. 1-4: 125GMT10-C rear view

8
125GMT
Amphenol Network Solutions
All rights reserved. 3.18.20 150566
509.926.6000 —amphenol-ns.com.com
1.4 Specifications
Inputs:
Specifications:
Voltage range (nominal voltage)
±12VDC, ±24VDC and ±48VDC
Max. input load rating 125GMT10/125GMT15:
125GMT10-C/125GMT15-C:
125A @ 65°C per panel
125A @ 55°C per panel (De-rated to 100A @ 65°C)
Short circuit withstand rating
5000A
Nominal power loss at full load
Less than 45W per side @5,000W full load per side (125A x 48V);
125A @ 65°C per panel
Percentage of full power dissipation at nominal voltage
Less than 0.5%
Max. input interrupt device
125% of panel rating (for 125A rated feeds)
Horizontal input terminal studs (with Keps nuts and flat
washers) for dual-hole compression lugs
Two pairs of ¼-20 studs on 5/8" centers per terminal [max. lug width of .5" (12.7
mm)]. Torque bolts (using 7/16" or 12 mm socket) to 50 in/lb. (5.5 N•m), max.
Input wire size
#8 AWG to #1/0 AWG
Voltage range (nominal voltage)
±12VDC, ±24VDC and ±48VDC
Grounding:
Specifications:
Earth GND terminal bolts (with washers) for dual-hole
compression lug
Three sets of 1/4-20 threaded holes on 5/8" centers. Torque bolts (using 7/16" or 12
mm socket) to 50 in/lb. (5.6 N•m), max.
Ground wire size
#6 AWG to #1 AWG
Outputs:
Specifications:
Output fuse
20A GMT Fuse
Output load
14A continuous
Minimum short circuit interrupt rating
5000A
Optional: Terminal blocks, single-hole compression lugs
20 or 30, #6-32 screws [max. lug width of .31" (7.9)]. Torque screw to 8 in/lb. (.9
N•m), max.
Optional: Output wire size, single-hole compression lug
#22 AWG to #6 AWG
Optional: Connectors (purchased separately)
20 or 30, P24 connector plugs, latching, safe touch
Optional: Output wire size, connectors
#14 AWG to #10 AWG
GMT fuses
Cooper Bussmann and Littelfuse
Alarms:
Specifications:
Alarm relay contacts
2A @ 30VDC; 0.6A @ 60VDC
Max. alarm card power rating
@12V: 18 mA (0.22W); @24V: 20 mA (0.48W); @48V: 30 mA (1.44W)
Alarm wire size
#24 AWG, typical (#26 to #20 AWG)
Alarm terminals
Wire wrap or mates with TE Connectivity 3-640428-3
Dimensions:
Specifications:
125GMT10/125GMT15 Height:
Depth:
Width:
125GMT10-C/125GMT15-C Height:
Depth:
Width:
1.75" (44 mm)
13.9" (353 mm)
17" (432 mm) without brackets
19” and 23” brackets included with panel
1.75" (44 mm)
13.8" (350 mm) without tie bar
16.5" (419 mm) with tie bar
17" (432 mm) without brackets
19” and 23” brackets included with panel
Tie bar not included with panel
Cable-end connectors not included with panel
Compliance:
Specifications:
UL
Listed
NEBS
Level 3

9
125GMT
Amphenol Network Solutions
All rights reserved. 3.18.20 150566
509.926.6000 —amphenol-ns.com.com
Section Two: Installation
2.1 Important Installation Guidelines
•Elevated Operating Ambient Temperature: If installed in a closed or multi-unit rack assembly, the
operating ambient temperature of the rack environment may be greater than room ambient. Consider
installing the equipment in an environment compatible with the maximum ambient temperature (Tma)
specified by the manufacturer.
•Reduced Air Flow: Maintain the amount of air flow required for safe operation when installing the
equipment in a rack.
•Mechanical Loading: Ensure mechanical loading is even to prevent hazardous conditions.
•Circuit Overloading: Overloading circuits may affect your overcurrent protection and supply wiring. Use
equipment nameplate ratings.
•Reliable Earthing: Maintain reliable earthing of rack-mounted equipment. Pay attention to supply
connections other than direct connections to the branch circuit.
•Disconnect Device: Incorporate a readily accessible disconnect device in the building installation wiring.
2.2 Installation Instructions
ALERT! Only qualified technicians may install and maintain this product. Verify all connections meet
requirements specified in local electric codes or operating company guidelines before supplying
power. Protect this equipment with a breaker sufficient to interrupt power levels specified.
ALERT! Verify all connections meet requirements specified in local electric codes or operating
company guidelines before supplying power. Unit shall be protected by a listed circuit breaker or
branch-rated fuse rated minimum 125% of panel rating (for 125A rated feeds).
ALERT! Install this product in locations accessible only to qualified personnel.
Please read these instructions carefully before beginning installation. If assistance is required, call Amphenol
Network Solutions Technical Support at 1-509-926-6000 or email us at [e-mail].
When you receive the equipment, carefully unpack it and compare it to the packaging list. Please report any
defective or missing parts to Amphenol Network Solutions Quality at [email protected]m or call 1-509-
926-6000.
Amphenol Network Solutions is not liable for transit damage. If the product is damaged, please report it to the
carrier and contact Amphenol Network Solutions Quality.
NOTE: For service or warranty information, please visit amphenol-ns.com and click on the support tab, email
Amphenol Network Solutions at [e-mail] or call us at 1-509-926-6000.
NOTE: The 125GMT family is suitable for installation as part of a Common Bonding Network (CBN) for
installation in Network Telecommunication Facilities and OSP.
NOTE: The 125GMT family is DC-I and can be grounded in both CBN and IBN networks. All feeds have
isolated returns and the chassis grounds are isolated from all returns. The 125GMT family is suitable for
installation in Network Telecommunication Facilities and in locations where the NEC applies.

10
125GMT
Amphenol Network Solutions
All rights reserved. 3.18.20 150566
509.926.6000 —amphenol-ns.com.com
2.2.1 Mounting brackets
1. The mounting brackets can be installed in 6 positions, from flush to 5 inch offset in 1 inch increments. Use
included hardware to install the mounting brackets. Both 19” and 23” mounting brackets are included.
2. Tighten screws to 20 in/lb. (2.23 N•m).
2.2.2 Optional tie bar installation (Connectorized panels only)
3. Use included hardware in accessory kit to install tie bar. Standard tie bar is available as an accessory for
connectorized panels.
4. Tighten screws to 8 in/lb. (.9 N•m).
Fig. 2-1: Installing mounting brackets
Fig. 2-2: Installing optional tie bar