Accessories
4.8 Residual current devices
3VA molded case circuit breakers with IEC certificate
396 Manual, 03/2019, A5E03603177010-03
Residual current devices
Standards
The combination of molded case circuit breaker and residual current device conforms to
IEC 60947-2 Annex B.
The residual current devices do not require an external power supply, but tap a supply from
the main current paths of the molded case circuit breaker or switch disconnector.
Guaranteed to function properly
Proper functioning of the residual current device is guaranteed even with only one phase and
N (applies to RCD320, RCD520, RCD520B and RCD820) or two phases (alternating current
or pulsating direct voltage).
Direction of incoming supply
The direction of incoming supply to the combination of circuit breaker and residual current
device is optional, i.e. it can be connected at the top or bottom. The performance of the
residual current devices is not impaired by regenerative feedback from motors.
Residual current devices without an additional letter at the end of the short code (e.g.
RCD520) meet the requirements for device type A, i.e. they are capable of detecting all
sinusoidal AC residual currents and pulsating DC residual currents.
The letter B at the end of the short code (e.g. RCD520B) indicates that it is a universal
current-sensitive residual current device (type B or B+).
Combination with external accessories
DIN rail adapters
DIN rail adapters are available as accessories for side-mounted residual current devices
RCD310 and RCD510 up to 160 A. These permit fast and easy installation of residual
current devices on 35 mm DIN rails compliant with IEC / EN 60715 TH35-7.5 and TH35-15.
You can find more information in chapter DIN rail adapter (Page 531).
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