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Precautions
Precaution 3: Use standard short-circuit copper bars for single-phase input. Do not short-
circuit the input using cables.
Precaution 2: The following figure shows the tightening torque. Hold the circuit breaker and pull
out the cable with force (10 kg force for a 125 A circuit breaker and 5 kg force for a 63 A circuit
breaker). Ensure that the cable does not move.
Precaution 1: Crimp cord end terminals on both AC and DC power cables, and ensure that the
crimped cord end terminal is square.
The core wires are
not exposed.
- Strip the cord end terminal based on Table 2 in Appendix A. Otherwise, the crimping may be
unreliable or the copper wire of the cable may be exposed.
2. The crimped terminal must be square (not round, D-shaped, or other shapes). It is
recommended that you use standard crimping pliers to crimp the terminal.
- After connecting the copper wire to the circuit breaker, ensure that no metal or copper wire
is exposed. If it is exposed, strip the cable and crimp the terminal again.
The crimped cord
end terminal is
square.
Ensure that the
terminals are
properly inserted.
Strip the cable based
on the length of the
cord end terminal.
Solution 1 Note that the interlock components
must be removed.
Solution 2
Pan head
screw
Flush head
screw
L N
N L1 L2 L
Issue: 02
Date: 2023 - 10 - 24
Precautions for Installing a New 1 U Circuit
Breaker
Copyright © Huawei Technologies Co., Ltd. 2023.
All rights reserved.
Precaution 4: It is recommended that cables be horizontally routed for 50 mm and then routed
upwards. Ensure that the cables do not block the ejection of the circuit breaker button.
Precaution 5: Warning! Aluminum wires cannot be directly connected to a circuit breaker.
Otherwise, the connection may be unreliable due to electrochemical corrosion. If you need to use
aluminum wires, see Appendix B.
App
end
ix
A Cable Terminal Selection
Circuit Breaker
Specifications/Shell Size
Image Cable Size Range Remarks
AC circuit breaker (63 A/3P)
10 – 16 mm
2
(with a
cord end terminal)
63 A, multi-pole,
round cable hole
AC circuit breaker (63 A/4P)
10 – 16 mm
2
(with a
cord end terminal)
AC circuit breaker (63 A/3P)
10 – 35 mm
2
(with a
cord end terminal) 63 A, multi-pole,
square cable hole
AC circuit breaker (63 A/4P)
10 – 35 mm
2
(with a
cord end terminal)
AC circuit breaker (100A/3P)
25 – 35 mm
2
(with a
cord end terminal)
100 A/125A, multi-
pole, square cable
AC circuit breaker (100A/4P) hole
25 – 35 mm
2
(with a
cord end terminal)
AC circuit breaker (125A/2P)
25 – 35 mm
2
(with a
cord end terminal)
AC/DC single-pole circuit
breaker (63 A series)
1 – 16 mm
2
(with a
cord end terminal)
Single-pole, round
cable hole
AC/DC single-pole circuit
breaker (125 A series)
16 – 35 mm
2
(with a
cord end terminal)
Single-pole, square
cable hole
Table 1 Circuit breakers
Appendix A Cable Terminal Selection
Cut the exposed part at the
end of the aluminum cable.
Select an appropriate
copper-aluminum
terminal.
Strip the cable for 20 mm
based on the insertion depth
of the copper-aluminum
terminal.
Crimp two lines on the
copper wire and
aluminum wire
respectively.
Wrap the insulation tape
around the copper terminal
and the aluminum cable
and wrap the matching
jacket for insulation.
Procedure:
Hydraulic pliers
model:
PJ-I1205/YQK- 120
Use the
corresponding die
for crimping.
Copper-
aluminum
terminals
apply only to
AC input
circuit
breakers with
square holes.
Insert the square copper
column of the copper-
aluminum terminal into the
circuit breaker.
When connecting a 35
mm
2
copper-aluminum
terminal to a circuit
breaker, ensure that the
side as shown in the
following figure faces
upwards. Otherwise, the
copper-aluminum terminal
may interfere with the
circuit breaker button.
Specifications of the 25 mm
2
copper-aluminum terminal:
Specifications of the 35 mm
2
copper-aluminum terminal:
Center line
25 mm
2
sheath
Center line (offset)
35 mm
2
35 mm sheath
2
terminal
25 mm
2
terminal
This side faces upwards.
Solution 2: copper-aluminum connecting pipe
Strip the copper wires of phases L1, L2, L3, and N at an interval of 130 mm to ensure that the
copper and aluminum connection pipes are staggered and do not interfere with the metal
mechanical parts in the cabinet.
Cut the exposed oxidized
part at the end of the
aluminum cable.
Select an appropriate
copper-aluminum
connecting pipe.
The length of the stripped
cable depends on the
insertion depth of the pipe.
Apply conductive
paste evenly to the
surface of the
aluminum wires
(thickness: 0.05–0.
mm).
- After crimping the
cable, pull the cable
with a force not less
than 1000 N (about
100 kg) to ensure that
the cable does not fall
off.
- If there are burrs or
sharp edges after
crimping, trim them to
ensure that the surface
is flat without burrs or
sharp edges.
Insulate with
fiberglass tubes
and heat-shrink
tubing.
Procedure:
Crimp two lines on the copper wire and
aluminum wire respectively.
Use the
corresponding die
for crimping.
Hydraulic
pliers
Aluminum wire
Copper wire
Copper
aluminum
connecting pipe
N L1 L2 L
Copper cable
Copper-
aluminum
conversion
terminal
Aluminum
cable
AC
distribution
box
Model:
GTL- 25
GTL- 35
Conductive paste
Fiberglass tube φ
Heat-shrink tubing φ
Connect the copper cables.
Precautions for Connecting Terminals to Circuit Breakers
When replacing a single-pole circuit breaker, use a flat-head screwdriver to press the small
boss, and push the circuit breaker based on the position of the cable hole.
Protruding
part
Protruding
part
When the crimped surface protrudes, ensure that the crimped surface does not contact the current-
through surface of the circuit breaker when the terminal is connected to the circuit breaker.
Otherwise, the terminal may be burnt.
Current-through surface: The side away from the
screw or tool hole is the current-through surface.
Current
through surface
Current
through surface
Small boss
Current
through surfaces
Press the
small
boss.
Push the
circuit
breaker.
Precautions for Replacing a Circuit Breaker
Huawei Technologies Co., Ltd.
Huawei Industrial Base, Bantian, Longgang
Shenzhen 518129 People's Republic of China
www.huawei.com
