Mitsubishi Electric C Series Handling And Maintenance page 29

(2) Connection of earth leakage circuit breaker
1 Connect to a power source suitable for the rating of the circuit breaker. Otherwise, malfunc-
tion and failure can result.
Application of overvoltage outside the applicable voltage range can cause burning as the
earth leakage circuit breaker incorporates electronic circuits.
Application of lower voltage than the applicable voltage range also fails operation.
2 Where a circuit breaker is used for 1 phase 3 wire system and 3 phase 4 wire system, be
sure to connect the neutral wire to the neutral pole of the circuit breaker. Otherwise, opera-
tion fails at overcurrent.
(a) For single phase two wire system, refrain from us-
ing neutral pole.
Where a 3-pole earth leakage circuit breaker is used for
single phase 2 wire system, connect to the right and left
poles of the circuit breaker. Using the neutral pole fails op-
eration as the control power for the operation is supplied
through the left and right poles.
(b) Don't connect in parallel.
Refrain from parallel connection as unnecessary operation
takes place because of loop circuit formed or the leak trip-
ping unit is burnt in some cases. Also refrain from parallel
connection of the earth leakage circuit breaker with a moul-
ded use circuit breaker.
(c) Don't connect in reverse.
The electronic circuit of ELCB as standard are short time
rating. If used by reverse connection, the electronic circuit
have damaged by continuous voltage of after tripping. There-
fore must not use reverse connection.
The following types are possible to using by reverse con-
nection.
NV32-SW, NV63-CW, NV63-SW
NV125-CW, NV125-SW, NV250-CW, NV250-SW
NV400-CW, NV400-SW, NV400-SEW, NV400-HEW
NV400-REW, NV630-CW, NV630-SW, NV630-SEW
NV630-HEW, NV800-SEW, NV800-HEW
Note 1. Measuring display unit (MDU) breakers are not available.
27
CAUTION
120V
240V
120V
Neutral wire
Types Applicable voltage
AC230V
AC230-400-440V
Neutral wire
Neutral pole
1φ2W
Line side
terminal
Load side
terminal
Power supply
Electronic
circuit