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3. Insert two steel cables, one end sleeved onto the bolts of the
interlocking pieces, and the other end secured with a clip, to
ensure that the steel cable is tightened properly (as shown in
the figure below);
4. Lever the basic device back into the cassette, and place the
circuit breaker in the Connect position;
5. With the circuit breakers both in the Open state, close Circuit
Breaker 1, and Lever 11 will turn counterclockwise to a certain
angle. At this point, Lever 22 also turns counterclockwise to
a certain angle, due to the force of Steel Cable 2. Now, the
tripping shaft of Circuit Breaker 2 is pressed down – adjust the
tightness of the steel cable with Regulating piece 2;
6. With the circuit breakers both in the Open state, close Circuit
Breaker 2, and Lever 21 will turn counterclockwise to a certain
angle. At this point, Lever 12 also turns counterclockwise to a
certain angle, due to the force of Steel Cable 1. Now, the trip-
ping shaft of Circuit Breaker 1 is pressed down – adjust the
tightness of the steel cable with Regulating Piece 1;
7. Verify whether the devices are properly mounted: First close
any circuit breaker and then try to close the other one. Failure
to close indicates the mounting is properly done.
Circuit breaker 1
interlocking pieces
Lever 12
Lever 11
Regulating part 1
Steel cable 1
Steel cable 2
clip 2
clip 1
Regulating part 2
Lever 22
Lever 21
Circuit breaker 2
interlocking pieces
Note:
The steel cable is too long and can be wound into the
shape shown above, but the sum of all bending angles cannot
exceed 720 degrees.
Circuit breaker 1
Circuit breaker 2
0
0
0
1
1
0
otes:
N
1 = Closed, 0 = Open
2. The mounting direction of the external neutral current trans-
former is subject to the wiring method of the circuit breaker:
For the circuit breaker with upper incoming line, the convex
surface of the external neutral current transformer faces the
transformer side;
For the circuit breaker with lower incoming line, the plane
surface of the external neutral current transformer faces the
transformer side;
When the Type IV external neutral current transformer is used:
For the circuit breaker with upper incoming line, the P2 side of
the external neutral current transformer faces the transformer
side;
For the circuit breaker with lower incoming line, the P1 side of
the external neutral current transformer faces the transformer
side;
3. Select the transformer model based on the width of N-phase
busbar
3
4
32
7
0
1
86
107
Type I
Type II
31
1
9
120
140
Type III
60
88.5
33
88
21
Upper entry line
Transformer
Convex surface
or P2 side
Load
C
B
A
C
B
A
N
N
lower entry line
Transformer
Plane surface
or P1 side
Load
C
B
A
C
B
A
N
N
126.5
167.5
38.5
53.5
13
5
13
9
14
2
Type IV
Mechanical interlock mounting instructions
To mount the steel cable interlock for two circuit breakers mount-
ed horizontally, follow below steps:
1. Lever out and remove the basic device of the circuit breaker
from its respective cassette;
2. Fasten the interlocking pieces with screws onto the desig-
nated position on the right side of the cassette;
Instruction Leafl et
Effective September 2022
IZM6 Series Air Circuit Breaker
Operating Instruction Leafl et