Accessories
4.8 Residual current devices
3VA molded case circuit breakers with IEC certificate
420 Manual, 03/2019, A5E03603177010-03
If the residual current device trips the molded case circuit breaker due to a high residual
current or actuation of the test button, the <RESET> button on the RCD is released ("RCD"
mode must be selected). At the same time, the trip alarm switch which is mechanically
coupled with the <RESET> button also signals that a trip has occurred.
The <RESET> button is labeled with the letter "R".
The following actions must be taken in order to reset the residual current device and reclose
the main contacts of the molded case circuit breaker:
1. Press the <RESET> button on the residual current device.
The "tripped" signal at the signaling contacts is canceled, the residual current device is
now reset.
2. Reset and switch on the molded case circuit breaker.
The molded case circuit breaker cannot be switched on before the <RESET> button on the
residual current device has been actuated and a residual current is no longer present
(I
Δn
> I
Δ
).
Parameterization of the residual current device
Setting button for response current I
Δn
Setting button for delay time Δt (RCD520 only)
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