Telect GMT Series User manual

© Telect, Inc., All Rights Reserved, 130339-7 A0
1.509.926.6000 :: telect.com
High-Power 20A GMT Series Fuse Panels
Power :: 20HPGMTXX
User Manual
Applys to : 20HPGMT05R :: 20HPGMT05FR :: 20HPGMT05BNR :: 20HPGMT05BNR-24 :: 20HPGMT12R-75 ::
20HPGMT03R :: 20HPGMT02R

© Telect, Inc., All Rights Reserved, 130339-7 A0
1.509.926.6000 :: telect.com
ii
High-Power 20A GMT Series Fuse Panels
Power :: Models 20HPGMT
Table of Contents
1.1 Overview ................................................................................................................................1
1.1.1 Specications ..............................................................................................................2
1.1.2 Standard & Special Features ......................................................................................5
1.1.2.1 Bay & Failure Alarm Options ...............................................................................6
1.1.2.2 Fail-Safe Circuit ...................................................................................................7
1.1.2.3 Power-Line Noise Filter .......................................................................................7
1.2 Installation ..............................................................................................................................8
1.2.1 Rack-Mounting Conditions and Considerations ..........................................................8
1.2.2 Inspection ....................................................................................................................8
1.2.3 Installing the Panel .................................................................................................9
1.2.4 Replacing the Alarm Board ....................................................................................13
1.3 Service ................................................................................................................................. 13
1.3.1 Owner Maintenance ...................................................................................................13
1.3.2 In-Warranty Service ....................................................................................................14
1.3.3 Out-Of-Warranty Service ............................................................................................14
1.3.4 Repacking for Shipment .............................................................................................14
1.4 Parts & Accessories.............................................................................................................. 14
1.5 Diagrams .............................................................................................................................. 16
1.5.1 Block Diagram.............................................................................................................16
1.5.2 1RU Dimensions ........................................................................................................17
1.5.3 2RU Dimensions ........................................................................................................18
1.6 Certicate of Conformity ...................................................................................................... 19
List of Figures
Figure 1 - 20HPGMT05BNR (1RU Panel) Front and Rear View ................................................1
Figure 2 - 20HPGMT12R-75 (2RU Panel) ..................................................................................1
Figure 3 - Model 20HPGMT05R (Front View) .............................................................................2
Figure 4 - Alarm Panel .................................................................................................................5
Figure 5 - Model 20HPGMT05BNR (Rear View) .........................................................................6
Figure 6 - Standard Alarm Hookups ............................................................................................6
Figure 7 - Alarm Hookups ............................................................................................................7
Figure 8 - Mounting Dimensions ..................................................................................................9
Figure 9 - Ground Lug Connection ............................................................................................ 10
Figure 10 - Compression Lug Inputs ..........................................................................................10
Figure 11 - Replacing the Alarm Board ...................................................................................... 13
Figure 12 - Power, Battery Return and Fuse Circuit .................................................................. 16

© Telect, Inc., All Rights Reserved, 130339-7 A0
1.509.926.6000 :: telect.com 1
High-Power 20A GMT Series Fuse Panels
Power :: Models 20HPGMT
1.1 Overview
Telect’s High-Power 100A GMT Series Fuse Panels
provide protected secondary distribution of -48
VDC power to telecommunications equipment at
the bay level (20HPGMT05BNR-24 is 24VDC).
Fuse panels are available for GMT outputs up to
20A per position in dual-circuit (10/10, 15/15, and
20/20) panel congurations.
Standard features include
• Dual-circuit, 100A input buses, -48
VDC (20HPGMT05BNR-24 is 24VDC)
• Discrete GMT fuse positions: 20A capacity w/o fuse
management for heat dissipation
• Alarm circuit board replaceable with panel in
service (hot-swap)
• Minimal rack space: one, 1.75”.
• EIA or 2”. WECO rack unit (1RU)
• for rear access connections; 2RU for
• total front access of dual-circuit 10/10 conguration
• 19”. or 23”. rack mounting, with mounting brackets
provided. Dual-Circuit 20/20 Panel
(20HPGMT02R) requires a 23-in. rack.
• Transparent terminal cover meets electrical and
equipment safety standards.
• Dummy GMT fuses are provided for all fuse
holders.
• Holes provided in chassis for inserting colored fuse
designation pins
• All 20HPGMT panels are NEBS (Level 3) and CE
certied.
• Fire rating: UL 94V-0 and/or VW-1 (for wiring)
• All models except 20HPGMT05R are recognized
by UL for USA and Canada. 20HPGMT05R is UL
listed for USA and Canada.
Figure 1 - 20HPGMT05BNR (1RU Panel)
Front and Rear View
Figure 2 - 20HPGMT12R-75 (2RU Panel)

© Telect, Inc., All Rights Reserved, 130339-7 A0
1.509.926.6000 :: telect.com
2
High-Power 20A GMT Series Fuse Panels
Power :: Models 20HPGMT
Special features include
• Bay Alarm Circuitry (20HPGMT05BNR and 20HPGMT05BNR-24)
• Fail-Safe Circuitry (20HPGMT05FR only): load sharing permits either feed to power all loads if the other
feed fails.
• Noise Filter Circuitry (20HPGMT05BNR and 20HPGMT05BNR-24)
Telect’s High-Power GMT Series Fuse Panels use discrete, not modular, GMT fuse holders, to limit heat buildup
when using 15A and 20A GMT fuses.
Figure 3 - Model 20HPGMT05R (Front View)
1.1.1 Specications
Environment: Specications:
Temperature range -5°C to 55°C (-23°F to 131°F)
Humidity 5% to 85% and noncondensing
Altitude range -197 ft to 13,100 ft (-60 m to 4000 m)
Acoustic noise 0 dBA above ambient
Fit & Finish Specications:
Material
(Custom color/nish available)
Cold-rolled steel, powder-coat telephone grey, baked
polyure- thane. Clear polycarbonate protective
terminal cover.
Weights (Approximate) Specications:
Weight 8 to 12 lb (~3.5 to 5.5 kg), depending on model
POWER

© Telect, Inc., All Rights Reserved, 130339-7 A0
1.509.926.6000 :: telect.com 3
High-Power 20A GMT Series Fuse Panels
Power :: Models 20HPGMT
Mechanical Interface: Specications:
Input terminals — Compression Stud: 1⁄4-20 with nut. (Use 7/16-in. [12 mm] socket.)
Lugs: Dual-hole compression lug (5/8 i n . c e n t e r t o c e n t e r ) .
0.516 in. (13.4 mm), max. lug width
Cable: Up to 1/0 AWG copper, depending on input
interruption device
Torque: 62 in.-lb (~6.8 N•m), max.
Output terminals —
Wire binding / Compression
Screw: #6 Phillips* panhead
Wire: 14 to 22 AWG, copper wire Lug: 10 to 22 AWG,
copper wire
Spacing: 3/8 in. (9.5 mm) centerline with barrier distance of
0.260 in. (6.6 mm)
Torque: 9 in.-lb (~1.0 N•m), max.
Alarm terminals — Wire Wrap 0.045 in. square wirewrap pins on 0.156 in. centers. Use 18 to
22 AWG copper
Ground terminals Screws: 2, #10 Phillips* panhead
Lugs: Single- or dual-hole compression lug (5/8in.
center to center). Dual-hole lug is recommended.
Cable: Up to #6 AWG copper for single-hole lug (Conductor
size depends on input interruption device.)
Torque: 21 in.-lb (~2.5 N•m), max.
* Screws with cross-recessed heads
Dimensions: Specications:
Dimensions (nominal) without brackets for all but
20HPGMT12R-75 & 20HPGMT02R
Width: 17 in. (432 mm)
Height: 1.75 in. (44.4 mm)
Depth: 12 in. (305 mm)
Dimensions (nominal)
without brackets for 20HPGMT02R
Width: 21 in. (533 mm)
Height: 1.75 in. (44.4 mm)
Depth: 12 in. (305 mm)
Dimensions (nominal) without brackets for 20HPG-
MT12R-75
Width: 17 in. (432 mm)
Height: 3.5 in. (89 mm)
Depth: 7.5 in. (190 mm)
† See Pages 17 and 18 for exact dimensions.

© Telect, Inc., All Rights Reserved, 130339-7 A0
1.509.926.6000 :: telect.com
4
High-Power 20A GMT Series Fuse Panels
Power :: Models 20HPGMT
Electrical Interface: Specications:
Operating voltage -48 Vdc, both sides
Current capacity
All Except 20HPGMT05FR
20HPGMT05BNR
20HPGMT05BNR-24
20HPGMT05FR
20HPGMT05BNR
20HPGMT05BNR-24
100A per bus (200A total for dual-circuit panels), max.
75A per bus (150A total for both buses)
Fuse capacity: 20, 30, or 40 (total, both circuits)
Maximum input interruption device rating • 125A for all models except those with noise lters.
• 90A for models with noise lters (20HPGMT05NR &
20HPGMT05BNR-24)
Maximum output interruption device rating 20A GMT fuse
Interrupt rating 450A
Short circuit withstand current 450A
Alarm contact relay 2A
Alarm board power rating @ 48 Vdc 1W
Panel heat dissipation per 100A bus @% load 1.0W (3.4 Btu/hr) @ 0%
1.2W (4.1 Btu/hr) @ 25%
4.8W (16.5 Btu/hr) @ 50%
11.4W (38.7 Btu/hr) @ 75%
21.3W (72.6 Btu/hr) @ 100%
Percentage of full load heat dissipa- tion at nominal
voltage
less than 1% of total load wattage

© Telect, Inc., All Rights Reserved, 130339-7 A0
1.509.926.6000 :: telect.com 5
High-Power 20A GMT Series Fuse Panels
Power :: Models 20HPGMT
1.1.2 Standard & Special Features
The following table compares the features of all standard 20HPGMT panels. All panels include a rear or front
transparent cover and most, except as footnoted in the following chart, can be mounted in either 19”. or
23”. racks. The paragraphs that follow briey describe some of the standard and special features included
with these panels.
Table 1 - Product Comparison Chart
Model No. Fuse Array -48 Vdc -24 Vdc Bay Alarm Fail-Safe
Circuit
Noise
Filter
20HPGMT05R X
20HPGMT05FR X X
20HPGMT05BNR X X X
20HPGMT05BNR-24 Dual 10/10 X X X
20HPGMT12R-75 (Front
Access - 2RU)
X
20HPGMT03R Dual 15/15 X
20HPGMT02R (23 inch
only)
Dual 20/20 X
GMT fuses are available in capacities ranging from 0.18A to 20A. A unique feature of the Telect High-Power GMT
Fuse Panel is that the fuse positions are oriented so the identication ags face down to provide easy location
of a blown fuse when the panel is at the top position of a relay rack or bay. (GMT splash covers are optional for
maximum safety when fuses blow.) Another unique feature of the GMT panels is a small hole below each fuse
position to accommodate color-coded optional designation pins. Designation pins are useful for quickly identifying
required fuse positions and rating of the fuses. The panel is delivered with dummy fuses in all positions.
The standard front panel includes dual-color LEDs for power and failure alarms on the face of an easily
removable/replaceable alarm card:
• The POWER LEDs are green when power is on
and red when power to that side goes off.
• The FAIL ALARM LED is green when all installed
fuses are OK and red when any installed, operable
fuse blows.
A POWER B POWER
FAIL
ALARM
OHPGMT05R
SN: 0206381 L#:E179636
WK-YR: 11-1999
Rev: A
20A MAX/FUSE
U
LUS LISTED
C
Figure 4 - Alarm Panel
Below the LEDs and alarm card is a pull-out circuit
designation card accommodating up to 40 circuit des-
ignation entries.

© Telect, Inc., All Rights Reserved, 130339-7 A0
1.509.926.6000 :: telect.com
6
High-Power 20A GMT Series Fuse Panels
Power :: Models 20HPGMT
The back panel of the 1RU panels contains input and output terminal connections (NEG or POS connections at
the top; RTN connections below), chassis ground connections, and wirewrap pins for external alarm hookups.
Figure 5 - Model 20HPGMT05BNR (Rear View)
1.1.2.1 Bay & Failure Alarm Options
The panel is available with alarm relays for standard remote/visual/audible failure alarms to light lights and
sound alarms when either power feed to the panel fails and/or any fuse blows. Along with the standard alarms,
Models 20HPGMT05BNR and 20HPGMT05BNR-24 include major/ minor bay alarms. Bay alarms are controlled
externally to turn on the panel’s Form C relay contacts in-circuit with external bay devices or connections.
Whenever a bay alarm occurs, the A POWER LED (for a major alarm) or B POWER LED (for a minor alarm) will
blink until external control is turned off.
Model 20HPGMT05FR includes enhanced power/fuse failure
alarms thatreplace the standard failure alarms. Where the
standard failure alarm doesn’t differentiate between power
or fuse failure, the enhanced power/fuse failure alarms
differentiate between A POWER, B POWER,and fuse failures
NC
C
NO
NC
C
NO
R
TNRT
N
R
E
M
O
T
E
V
I
S
U
A
L
A
U
D
I
B
L
E
Externa
l
Alarm
Device
E
xternal
Al
arm
D
evice
Figure 6 - Standard Alarm Hookups

© Telect, Inc., All Rights Reserved, 130339-7 A0
1.509.926.6000 :: telect.com 7
High-Power 20A GMT Series Fuse Panels
Power :: Models 20HPGMT
-Vdc-Vdc
Maj In Maj RTN Min In
Min RTN
Maj NC
Maj NO C
Min NC
Min NO
External
Alarm
Device
External
Alarm
Device
NC
C
NO
NC
C
NO
-Vdc RTN -Vdc
RTN
A
PWR
B
MAJ MIN PWR
A
PWR
B FUSE
NC
C
NO
A
R
PWR
FUSE
NC
C
NO
External
Alarm
Device
External
Alarm
Device
Bay Alarms (20HPGMT05BNR
& 20HPGMT05BNR-24)
Enhanced Alarms (20HPGMT05FR)
Figure 7 - Alarm Hookups
1.1.2.2 Fail-Safe Circuit
Schottky diodes are cross-connected at the input to the power distribution circuits. When both power supplies are
energized in a dual-circuit panel, power is balanced between the two supplies by the diodes. If one power supply
loses its power or is shut down, the other supply shares its power with both outputs (A and B) through the
Schottky diodes. The battery return circuits for A and B are common since both circuits must operate from either
the A or B power source.
The fail-safe feature reduces the A and B inputs to 75A maximum for each bus (total 150A per panel). The
fail-safe feature also includes the enhanced failure alarms described previously.
NOTE: For the fail safe load sharing to function properly, the capacity of each of the user-supplied external feeder
fuses or breakers must be greater than the total load of the panel’s A and B outputs combined. For
example, if the panel’s total Load A = 10A and Load B = 10A, then the feeder fuse for Side A and Side B must
each be at least 20A (up to 125A). If the panel goes into Fail Safe mode, the lone input terminal can handle up
to 150A.
1.1.2.3 Power-Line Noise Filter
The lter characteristics under load are such that high-frequency transients are suppressed below effective
interference levels for telecommunications equipment used with the panel. With this lter option, the max capacity
of the bus is 75A. Typical lter characteristics are:
60 Hz -44dB 200 Hz -58dB 1kHz -96dB 10kHZ -102dB

© Telect, Inc., All Rights Reserved, 130339-7 A0
1.509.926.6000 :: telect.com
8
High-Power 20A GMT Series Fuse Panels
Power :: Models 20HPGMT
1.2 Installation
1.2.1 Rack-Mounting Conditions and Considerations
Elevated operating temperature: If you install this equipment in a closed or multi-unit rack assembly, the
operating ambient temperature of that environment may become higher than room temperature. Be sure to install
the equipment in an environment that can become no warmer than the manufacturer’s specied maximum
ambient temperature (Tma).
Reduced air ow: Make sure the air ow around the equipment in a rack is enough for safe operation of the
equipment.
Mechanical loading: To prevent an accident, make sure the equipment load is even.
Circuit overloading: To prevent problems with the over-current protection and supply wiring,
take care not to overload the circuits. Pay attention to equipment nameplate ratings.
Reliable earthing: Maintain reliable earthing of rack-mounted equipment. Pay attention to supply connections as
well as direct connections to the branch circuit (i.e., use of power strips).
Disconnect device: Incorporate an easy-to-reach disconnect device in the building’s installation wiring.
1.2.2 Inspection
Please read and understand all instructions before beginning installation. If you have questions, contact Telect
Technical Support at [email protected] or call 1.509.926.6000.
When you receive the equipment, carefully unpack it and compare it to the packaging list. Please report any
defective or missing parts to Telect Quality at [email protected] or call 1.509.926.6000.
Telect is not liable for transit damaged. If the product is damaged, please report it to the carrier and contact Telect
Quality.

© Telect, Inc., All Rights Reserved, 130339-7 A0
1.509.926.6000 :: telect.com 9
High-Power 20A GMT Series Fuse Panels
Power :: Models 20HPGMT
1.2.3 Installing the Panel
ALERT
!
ALERT
!
ALERT
!
ALERT! Install this product 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.
Only qualied technicians may install and maintain this product.
ALERT! Verify all connections meet requirements specied in local electric codes or operating company
guidelines before supplying power. Protect this equipment with a fuse or breaker sufcient to interrupt
power levels specied under “Electrical Specications,” on page 2.
ALERT! Each panel is tested at the factory. Telect recommends, however, that you perform the testing
outlined in the following installation procedure to ensure that no damage has occurred during shipping
and handling. Both Sides A and B input circuits need to
be tested.
Except for Dual-Circuit 20/20 GMT Panels, brackets are provided for either ush or extended EIA or WECO
mounting in a 19 in. or 23 in. rack. Mount the Dual-Circuit 20/20 GMT Panels to a 23-in EIA or WECO rack.
1. Locate an unused rack position and mount the panel using the four, 12-24 thread-cutting screws, washers,
and star washers provided. Figure 8 shows the hole locations.
2. Tighten screws to 35 in.-lb. (4.29 N•m).
3. Remove the see-through cover.
4. Before connecting any conductor, use a multimeter to measure the resistance between the input NEG and
RTN terminals at the front or rear corners of the panel. Expect 500Ω or more for both Side A and Side B.
Figure 8 - Mounting Dimensions
MOUNTING BRACKETS
1 1/4”
(3” for FFA) 1 3/4”
(3 1/2” for FFA)
1” (19” RACK)
3” (23” RACK)
FRONT OR REAR PANEL
19” OR 23”
1”

© Telect, Inc., All Rights Reserved, 130339-7 A0
1.509.926.6000 :: telect.com
10
High-Power 20A GMT Series Fuse Panels
Power :: Models 20HPGMT
WARNING
!
WARNING! Failure to properly ground this equipment can create hazardous conditions to installation
personnel and to the equipment.
ALERT
!
ALERT! Only use components and crimping tools approved by agencies or certifying bodies recognized
in your country or region such as Underwriter’s Laboratories (UL), TUV, etc.
5. For ground wiring: Use a listed (approved) crimping tool to attach a listed (approved), single- or dual-hole
compression lug (dual hole is highly recommended) suitable for a #10 stud (~5mm) on 5/8-in. (15.9 mm)
centers onto a suitable ground wire. (Ground wire can be up to #6 AWG for a single-hole lug. Conductor size
depends on input interruption device.)
6. Use a coarse, nonmetallic cleaning pad to clean terminals and stud(s).
7. Telect recommends that you lightly coat anti-oxidant on the lug,
grounding screw(s), and surrounding contacting surface.
8. Connect the lug to the rear panel using the #10 screw(s)
provided, as shown in Figure 9.
9. Make sure the input power is off.
10. For input wiring:
a. Crimp dual-hole compression lugs for 1⁄4-in. studs
on 5/8-in. (15.9 mm) centers onto suitable copper
wires (#6 to 1/0 AWG) for NEG (or POS) and RTN
terminals, Feeds A and B. Lug width must not
exceed 0.52 in. (13.4 mm).
b. Use a coarse, nonmetallic cleaning pad to clean
the terminals and studs.
c. Lightly coat anti-oxidant on the lugs and input negative and positive terminals.
d. Connect the lugs to Feed A and B input terminals on the back of the panel using the 1⁄4-20 KEPs nuts and
washers provided, as shown in Figure 10.
e. Use a 7/16-in (12 mm) socket to tighten lugs to 62 in.-lb. (~6.8 N•m).
Figure 9-Ground Lug Connection
Figure 10 - Compression Lug Inputs
WARNING
!
WARNING! Before connecting input power cables,
make sure the input power to the panel is turned off.

© Telect, Inc., All Rights Reserved, 130339-7 A0
1.509.926.6000 :: telect.com 11
High-Power 20A GMT Series Fuse Panels
Power :: Models 20HPGMT
11. Make sure the power is off (open breaker, dummy fuse, or vacant fuse holder at power distribution unit [PDU])
before connecting this panel’s cables to the PDU.
12. Make sure that only dummy GMT fuses are installed in the panel or that the GMT fuse holders are vacant.
13. Enable the fuse or breaker at the PDU (90A or 125A max., with or without the noise-lter feature, respectively)
to turn on Side A of the panel.
14. Check the voltage and polarity at the input connectors of the panel. Also, check that
• The A POWER LED on the front of the panel turns on (green).
• The FAIL ALARM LED turns green.
• The B POWER LED must remain red.
15. On the rear of the panel, with A POWER lit (normal operation) — but with the B POWER LED off (failure
operation) — test the power-fail relays:
• For a panel with standard failure alarms, test across the remote (R), visual (V), and audi- ble (A) pins.
When testing,
− Expect an open circuit (00Ω) between Terminals C and NC.
− Expect continuity (0Ω) between Terminals C and NO.
• For a panel with enhanced failure alarms (included with fail-safe feature), test at A PWR, B PWR, and F ALM
pins. When testing the A PWR and F ALM pins,
− Expect continuity (0Ω) between Terminals C and NC.
− Expect an open circuit (00Ω) between Terminals C and NO. Conversely, when testing the B PWR pins,
− Expect an open circuit (00Ω) between Terminals C and NC.
− Expect continuity (0Ω) between Terminals C and NO.
16. Repeat Steps 13 to 15 for Feed B and watch to make sure the B POWER LED turns green. Also, across all
sets of alarm pins,
• Expect continuity (0Ω) between Terminals C and NC.
• Expect an open circuit (00Ω) between Terminals C and NO.
17. For output wiring, do either of the following:
• If using lugs , strip off 3/8 in. (~10 mm) of insulation from one end of the copper output wires and then crimp
on ring or forked, single-hole lugs, as required by NEC. (Screw terminals will accommodate lugs for up to
10 AWG.)
• If using bare wire, strip off 5/8 in. (~15 mm) of insulation. (Stranded wires should be tinned.)
CAUTION
!
CAUTION
!
CAUTION! Disconnect all inputs before servicing this unit.
CAUTION! For a panel with an input noise lter, reversing the input cables between the positive and
negative terminals could result in damage to the panel. Double-check before proceeding to ensure that
the NEG (or POS) and RTN feeds from the PDU are cabled to the proper terminals.

© Telect, Inc., All Rights Reserved, 130339-7 A0
1.509.926.6000 :: telect.com
12
High-Power 20A GMT Series Fuse Panels
Power :: Models 20HPGMT
18. Telect recommends that you lightly coat anti-oxidant on lugs, wires, and output negative and positive
terminals before connecting the lugs/wires to outputs. (NEC species only one lug/ wire and load for each
output terminal.)
19. Tighten the screws to 9 in.-lb. (~1.0 N•m).
20. Connect the other end of the output wires to load.
21. Use the pull-out designation card at the front of the panel to record outputs, as specied by operating
company standard operating procedures.
22. Make sure the inputs at loads are disabled by removing all power cards or all input fuses at the load
equipment.
Always follow the recommended operating company guidelines when disabling load equipment.
23. Insert the proper sizes of GMT fuses in designated fuse holders using the designation card to identify the
circuits. If applicable, install color-coded designation pins to match the fuses.
24. Check voltage and polarity at input of loads.
25. After you have installed all designated GMT fuses, check that the FAIL ALARM LED is still green. Again, test
the alarm relay contacts at R, V, A, F ALM pins on the rear of the panel. As before,
• Expect continuity (0Ω) between Terminals C and NC.
• Expect an open circuit (00Ω) between Terminals C and NO.
ALERT
!
ALERT
!
ALERT! GMT fuses have a small, inherent electrical resistance resulting in a small inherent power
loss. For this reason, the GMT fuse manufacturer recommends that the load for GMT fuses up to and
including 7.5A not exceed 80% of the fuse rating and that the load for GMT fuse sizes 10A, 15A, and
20A not exceed 70% of the fuse rating. For example, the load for a 15A GMT fuse should not exceed
10.5A (15A x 0.70 = 10.5A).
Total load for all fuse outputs on each side must not exceed 100A for a panel without the fail-safe feature,
or 75A for a panel with the fail-safe feature.
ALERT! Use only UL-listed circuit breakers or UL-recognized component secondary protection devices.

© Telect, Inc., All Rights Reserved, 130339-7 A0
1.509.926.6000 :: telect.com 13
High-Power 20A GMT Series Fuse Panels
Power :: Models 20HPGMT
26. 26. If available, replace one of the fuses with a blown fuse and check that the FAIL ALARM LED changes to
red. Check the R,V, A, F ALM pins again:
• Expect an open circuit (∞Ω) between Terminals C and NC.
• Expect continuity (0Ω) between Terminals C and NO. When nished, re-install the operable fuse.
27. If desired, wirewrap the remote external audio/visual alarm indicator wires (solid copper wires, #22 to #18
AWG) to the alarm terminals.
28. One by one, re-enable the load equipment and verify proper operation.
29. Re-install the cover.
1.2.4 Replacing the Alarm Board
If the alarm LEDs or other alarm functions are not
operating properly, the alarm circuit board may be
removed and replaced from the front of the fuse panel.
You do not need to remove power or otherwise take the
fuse panel or the equipment it is feeding out of service
to perform alarm board replacement.
Contact Telect for a replacement alarm board. (See
“1.4 Parts & Accessories” on page 14.) When
replacing an alarm board, ensure that the keyed
connector at the rear wall of the panel mates properly
with the new board.
1.3 Service
WARNING
!
WARNING! DISCONNECT ALL INPUTS BEFORE SERVICING THIS UNIT.
CAUTION
!
CAUTION! Only qualied technicians may install and maintain this product.
1.3.1 Owner Maintenance
High-Power GMT Fuse Panels do not require special preventive maintenance.
If you encounter technical difculties, please use the online request form at www.telect.com under
Support\Technical Support or call Telect directly at 888.821.4856.
Plastic clips hold the
alarm board to the
front of the panel.
Figure 11 - Replacing the Alarm Board

© Telect, Inc., All Rights Reserved, 130339-7 A0
1.509.926.6000 :: telect.com
14
High-Power 20A GMT Series Fuse Panels
Power :: Models 20HPGMT
1.3.2 In-Warranty Service
Contact Telect Quality at 1.509.926.6000 or e-mail us at [email protected]. Telect will ship a new replacement
product, along with a return shipping label and authorization information. When you receive your replacement
product, pack up the defective product and return it to Telect using the return label, box and any
additional information provided.
1.3.3 Out-Of-Warranty Service
Follow the In-Warranty directions above. Telect charges a processing fee for out-of-warranty service, and you
must submit a Purchase Order along with a Return Material Authorization (RMA) before returning equipment. The
processing fee guarantees a repair estimate and is credited against actual material and labor costs. Call Telect
Quality at 1.509.926.6000 for more information.
1.3.4 Repacking for Shipment
1. Tag the equipment showing owner’s name, address, and telephone number, together with a detailed
description of the problem.
2. Use the original shipping container if possible. If you do not have it, package the equipment in a way to
prevent shipping damage. Include the RMA inside the container and legibly print the RMA number on the
outside of the package, near the shipping address.
3. Insure the package.
1.4 Parts & Accessories
Table 2 - Alarm Boards
Item Description Part Number
Alarm Board for Dual Circuits Standard 16188F01
Table 3 - GMT Fuses
GMT Fuse Part Numbers GMT Fuse Parts Numbers for Colored
Designation Pin
0.18A Yellow (YEL) 130781 102435-21
1⁄4A Violet (VIO) 100151 102435-2
1⁄2A Red (RED) 004001 102435-5
3⁄4A Brown (BRN) 004008 102435-7

© Telect, Inc., All Rights Reserved, 130339-7 A0
1.509.926.6000 :: telect.com 15
High-Power 20A GMT Series Fuse Panels
Power :: Models 20HPGMT
Table 3 - GMT Fuses
GMT Fuse Part Numbers GMT Fuse
Parts Numbers for Colored
Designation Pin
1A Gray (GRY) 100991 102435-8
11/3A White (WHT) 004006 102435-9
11⁄2A White/Yellow (WHT/YEL) 004011 102435-10
2A Orange (ORN) 004002 102435-11
2.5A White/Orange (WHT/ORN) 130783 102435-12
3A Blue (BLU) 004012 102435-13
3.5A White/Blue (WHT/BLU) 130782 102435-14
4A White/Brown (WHT/BRN) 004013 102435-15
5A Green (GRN) 004014 102435-16
71⁄2A Black/White (BLK/WHT) 004010 102435-17
10A Red/White (RED/WHT) 004015 102435-18
12A Yellow/Green (YEL/GRN) 102287 102435-19
15A Red/Blue (RED/BLU) 102288 102435-20
20A White/Green (WHT/GRN) 127240RC 102435-22
Dummy Fuses 132748
GMT Safety Covers 116915
Medium-duty GMT fuse puller 06113-03
Table 4 - Dual-Hole Compression Lug Part Numbers vs. Input or Ground Wire Size For 1⁄4-in. Studs
on 5/8-in. Centers)
1/0 AWG #2 AWG #4 AWG #6 AWGa #8 AWG #10 AWG
T&B 54206
(T&B Die
Code 29)
54205
(T&B Die
Code 24)
54850BE
(T&B Die
Code 21)
Burndy YA25L2NT14E1
(Burndy Die
Code 12)
YA2CL2NT14
(Burndy Die
Code 10)
YA4CL2TC14
(Burndy Die
Code 8)
YA6CL2TC14
(Burndy Die
Code 7)
YA8CL2TC14
(Burndy Die
Code 9)
YAV10
2TC14
Panduit LCDN2-14AQ
(Panduit Die
Code 33)
(Burndy Die
Code 10)
LCD6-14A-L
(Panduit Die
Code 24)
(Burndy Die
Code 7)
LCD8-14A-L
(Panduit Die
Code 21)
(Burndy Die
Code 9)
LCD10
-14A-L
a. #6 AWG lug can be used for dual-hole grounding as well.

© Telect, Inc., All Rights Reserved, 130339-7 A0
1.509.926.6000 :: telect.com
16
High-Power 20A GMT Series Fuse Panels
Power :: Models 20HPGMT
Table 5 - Single-Hole Ring Lug Part Numbers vs Output Wire Size (For #6 Panhead Screws)
#22 - 18 AWG #22-16 AWG #16 - 14 AWG #12 - 10 AWG
AMP 51863 51863 320619 329697
Panduit PN18-6R-M PN14--6RN-M
1.5 Diagrams
1.5.1 Block Diagram
Figure 12 - Power, Battery Return and Fuse Circuit

© Telect, Inc., All Rights Reserved, 130339-7 A0
1.509.926.6000 :: telect.com 17
High-Power 20A GMT Series Fuse Panels
Power :: Models 20HPGMT
19.00 [48 2 .6]
23.00 [58 4 .2]
F R O N T V IE W
w w w .te l ec t. co m
0.27 [6.8 ]
R E A R V IE W
(R O T A T E D )
N O T E : D im e n sio ns a re in in . [m m ].
M a x. lu g w id th is 0 .5 4 in . (1 3.7 m m )
1 0-3 2 P a n he a d S c re w s a re In clu de d.
3.0000
P a n e l m ay b e flus h m ounted
or extended b y u p to 3 in.
(76 m m ) in 0 .5 in. (12.7 m m )
inc re m en ts .
T O P VIE W
0.62 [15 .8 ] 0.33 [8.5 ]
0.30 [7.5 ]
0.62 [15 .9 ]
M a x. lu g w id th is 0 .6 7 in . (1 7.0 m m )
2.27 [57 .7 ]
0.75 [18 .9 ]
0.12 [3.0 ]
9.63 [244 .5 ]
1.00 [25 .4 ]
17.00 [43 1 .8]
1.25 [31 .7 ] 1.75 [44 .5 ]
T ra ns p are n t C o v er
6 -3 2 P a n he a d S cre w s
14- 20 S tu ds & K E P S N u ts
1.5.2 1RU Dimensions

© Telect, Inc., All Rights Reserved, 130339-7 A0
1.509.926.6000 :: telect.com
18
High-Power 20A GMT Series Fuse Panels
Power :: Models 20HPGMT
3.48 [88.4]0.98 [25.0] 2.95 [75.0]
2.50 [63.5]
P a n e l m a y b e flu s h m ounted
or extended b y u p to 2 .5 in.
(63.5 m m ) in 0.5 (1 2 .7 m m )
increm ents.
2.44 [61.9]
Tra n s p a rent C o v e r O ve r T e rm inals O nly
F R O N T V IE W
T O P V IE W
23.00 [584.2]
19.00 [482.6]
17.00 [431.8]
7.50 [190.5]
0.12 [3.0]
N O T E : D im e nsio n s ar e in in . [m m ].



















 







 









w w w .te le c t. co m
0.27 [6.8] 0.62 [15.9]
M ax. lu g w idth is 0.5 4 in . (1 3 .7 m m )
0.26 [6.6]
0.33 [8.5] 0.62 [15.8]
M ax. lu g w idth is 0.6 7 in . (1 7 .0 m m )
6-32 P an h ea d S crew s
1 0 -3 2 P a n he a d S c re w s
(B o tto m H alf o f F ron t)
14- 2 0 S tu d s & K E P S N u ts
1.5.3 2RU Dimensions
Telect assumes no liability for the application or use of these products. Neither does Telect convey any license
under its patent rights or the patent rights of others. This document and the products described herein are subject
to change without notice.