Siemens 3VA1 100 A Manual page 343

Other auxiliary inputs
Two further auxiliary inputs in the form of screw terminals are also provided:
REMOTE-T
The residual current device can be remotely tripped via this auxiliary input for test purposes
("Remote test button"), for example.
To utilize this function, the customer must connect, for example, a pushbutton (NO contact)
to terminals 1Y1 and 1Y2 by means of a two-core, twisted cable which must not be more
than 300 m in length. The switching contact should have a minimum breaking capacity of 5 V
/ 1 mA. The residual current device trips if the pushbutton is actuated for at least 2 ms. The
terminals 1Y1 and 1Y2 are galvanically isolated from the mains supply (functional extra low
voltage, FELV).
In special cases, such as cable installation outdoors, the amplitude of overvoltages (e.g.
overvoltages due to thunderstorms) between the conductor and ground must be limited to
2.5 kV by suitable routing of the cable or other protection measures.
Each residual current device requires a separate NO contact and cable for remote tripping. It
is not possible to use one cable and connect two or more residual current devices in parallel.
It is necessary to use an unshielded cable or a shielded, twisted-pair cable with a maximum
capacitance of 36 nF as well as a maximum resistance of 50 ohms (total length out and
back).
3VA molded case circuit breakers
Manual, 04/2015, A5E03603177010-02
Accessories
4.8 Residual current devices
343