Siemens 3VA1 100 A Manual page 350

Accessories
4.8 Residual current devices
Communications interface
The RCD-ETU connecting cable not only carries the trip command, but also acts as the
communications interface between the residual current device and the 3VA communication
system.
Precondition for interface functionality:
● The 3VA2 molded case circuit breaker is equipped with a communication-capable,
electronic trip unit (ETU 5-series or 8-series).
● The molded case circuit breaker is linked to the communication system via a COM060
communication module.
If the residual current device is linked to the communication system, the link can be used not
only to interrogate the device for important status, diagnostic, maintenance and identification
data, but also to transmit commands.
The residual current device is normally supplied with power by the main current paths. If the
molded case circuit breaker is switched off, this power supply is also disconnected (infeed at
top). In order to maintain the link to the communication system when the power supply from
the main current paths is disconnected, the residual current device is supplied with the
necessary power by the COM060 communication module.
350
3VA molded case circuit breakers
Manual, 04/2015, A5E03603177010-02