Siemens 3VA1 100 A Manual page 344

Accessories
4.8 Residual current devices
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 a standard auxiliary switch (NO contact) 3VA9988-
0AA13 for interrogation of the circuit breaker status to allow resetting of the tripped signal.
This switch is installed in the accessories 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.
344
3VA molded case circuit breakers
Manual, 04/2015, A5E03603177010-02