Accessories
4.8 Residual current devices
3VA molded case circuit breakers with IEC certificate
462
Manual, 03/2019, A5E03603177010-03
CB-S (Circuit Breaker Switch)
If the molded case circuit breaker / RCD820 assembly has an infeed from below (reverse
feed), it is absolutely essential to install an auxiliary switch (internal accessory, circuit
breaker with article number 3VA9988-0AA13) for interrogation of the circuit breaker status to
allow resetting of the tripped signal. In this case, the "normally closed contact", i.e. cable at
.1C and .2NC, of the changeover contact must be connected.
This switch is installed in the accessory compartment of the molded case circuit breaker. The
auxiliary switch is then connected to terminals 2Y1 and 2Y2 of the floating contact CB-S. It is
necessary to use an unshielded or shielded twisted-pair cable, no more than 1 m in length,
with a maximum capacitance of 36 nF as well as a maximum resistance of 50 ohms (total
length out and back).
When the molded case circuit breaker is reset and then switched on again, the contacts .1C
and .2NC of the auxiliary switch are closed and the tripped display on the residual current
device is reset.
The auxiliary switch is not included in the scope of supply and must be ordered separately.
The method for connecting the auxiliary switch to auxiliary contact CB-S is described in the
Operating Instructions for the RCD820 residual current device.
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