Accessories
4.8 Residual current devices
3VA molded case circuit breakers
Manual, 04/2015, A5E03603177010-02
355
Modular residual current device
Thanks to its design, the modular residual current device type A (MRCD) 5SV8101-6KK is
compatible with all molded case circuit breaker designs and can therefore be combined with
3VA1 molded case circuit breakers/switch disconnectors and with molded case circuit
breakers from the 3VA2 series.
The modular residual current device is installed on a DIN rail (35 mm) as close as possible to
the molded case circuit breaker/switch disconnector.
The modular residual current device is connected to a summation current transformer
through which all live conductors (including neutral conductor where applicable) must be
routed. The residual current is detected in the summation current transformer and
transferred to the MRCD. If this current exceeds the limit value for the set rated residual
current I
Δn
, the residual current device trips the molded case circuit breaker/switch
disconnector by means of a shunt trip or undervoltage release.
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