Accessories
4.8 Residual current devices
3VA molded case circuit breakers with IEC certificate
470 Manual, 03/2019, A5E03603177010-03
If the N pole is protected, the 100% setting (protection) is recommended with the
corresponding cable cross-section in the N pole. According to IEC 60947, the neutral
conductor must be connected to the designated terminal in the case of a 4-pole breaker.
Connecting a line conductor to the switching pole labeled N is not permitted.
3. The same conditions apply in 1 or 2-phase operation as in 3-phase operation with respect
to the parameter settings of the residual current device (I
Δn
or Δt) or the trip unit of the
molded case circuit breaker (e.g. I
r
, I
i
).
Connection of residual current device for 1-phase operation
The following 3 and 4-pole molded case circuit breakers equipped with a residual current
device can be operated in a single phase (L to N) with 2-pole switching:
● Loadside residual current devices for 3VA1: RCD320 and RCD520
Permissible rated operational voltage: 100 – 277 VAC 50/60 Hz
● Loadside residual current devices for 3VA2: RCD820
Permissible rated operational voltage: 100 – 400 VAC 50/60 Hz
Wiring example for 1-phase operation, 2-pole switching (3 and 4-pole molded case circuit
breakers)
3-pole
4-pole
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