E-21
ENGLISH
8.2 Precautions for connecting
Use M12 bolts, plain washers, and spring washers to connect the conductor. Clean the surface of conductor
to be connected to the (silver plating) terminal of circuit breaker and securely tighten the bolts with a correct
torque (M12: 45±5 N·m).
The circuit breaker terminal which is applicable to connect the conductor is different depending on the shape
of the terminal.
Tightening torque
25mm
Use plain washers to connect so that the
washers do not overlap with each other.
CAUTION
Plain
washer
Plain
washer
CAUTION
Circuit breaker
terminal
(silver plated)
Conductor
M12
45
±
5 N·m
Arrange the conductor strip to contact the
terminal of the circuit breaker securely.
And fix the conductor strip with a bolt so that no
force is applied to any direction of the terminal.
CAUTION
Circuit
breaker
Conductor
strip
Bolt
Circuit breaker
terminal
Do not oil.
Since the fault current flowing through the conductors causes large electromagnetic forces, the conductors
should be secured firmly, using the values in the below table as a reference. The distance between the fixing
support and the circuit breaker conductor strip should be less than 200 mm.
Type
Electromagnetic force in N per 1 m conductor (3-phase short circuit)
Conductor distance (mm)
Prospective fault current kA (pf)
30 (0.2)
42 (0.2)
50 (0.2)
AED630-CV to AED1600-CV
85
7,700
15,100
21,400
Circuit
breaker
Conductor strip
(N)
Fixing support
200 mm max.
Ensure that they have a sufficient current capacity. Refer to the following table.
(Note)
The above table shows a conductor size based on IEC 60947-1 Table 11 in ambient temperature 40°C
and open air. The above figure shows an examination circuit.
Conductor size (Ambient temperature: 40
°
C at open air)
(Compliance with IEC 60947-1)
Rated current
connecting max. (A)
(Note) The values indicate the quantity per pole and terminal.
Arrangement
Conductors (Copper bus bar)
Quantity (Note)
630
With long
surface vertical
1000
1250
1600
2
2
2
2
Conductor size (mm)
40
×
5
60
×
5
80
×
5
100
×
5
2 m
3 m
Circuit
breaker
Screw size
Tightening torque (N·m)
M12
45±5
