Accessories
4.8 Residual current devices
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03
387
Since all residual current devices can be set to between 0.03 A and maximum 5 A or 30 A,
they are suitable for use in the following applications:
● Personnel protection: I
Δn
= 30 mA with instantaneous tripping
In order to protect personnel, it is necessary to seal the transparent protective cover so
that the 30 mA setting range cannot be changed.
● Fire protection: I
Δn
≤ 300 mA
● Protection in the case of indirect contact
● Ground-fault protection
While residual current devices attached to the circuit breakers are supplied with voltage from
all connected phases of the system to be monitored, the modular residual current device
(MRCD) is supplied from a 1-phase auxiliary voltage source (internal or external). The
modular residual current device utilizes an undervoltage release (UVR) or a shunt trip.
The recommended applications for different RCD designs are thus as follows:
+ Suitable
− Less suitable
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