Accessories
4.8 Residual current devices
3VA molded case circuit breakers with IEC certificate
450 Manual, 03/2019, A5E03603177010-03
The molded case circuit breaker is tripped by means of a direct-acting tappet which engages
in the breaker mechanism from the residual current device.
In addition to manually checking the proper functioning of the residual current device by
pressing the test button, cyclic self-tests are performed inside the residual current device.
Checks are performed periodically, for example, to ensure that:
● the microcontroller is functioning properly
● the physical connection between the printed-circuit board and the maglatch is interrupted
● the current transformers and the detection electronics are functioning properly
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