Connection
8.1 Connection
SIRIUS 3RU thermal overload relays / SIRIUS 3RB electronic overload relays
100 Manual, 09/2016, A5E03656507420A/RS-AB/003
3RB20 and 3RB21 electronic overload relays
● Size S6:
– Main circuit: busbar connection with through-hole technology
– Auxiliary circuit: optionally screw or spring-loaded connection
● Sizes S10 / S12:
– Main circuit: Bus connection
– Auxiliary circuit: optionally screw or spring-loaded connection
3RB30 and 3RB31 electronic overload relays
● Sizes S00 and S0:
– Main and auxiliary circuits: optionally screw or spring-type terminals
● Size S2:
– Main circuit: Screw connection with box terminal or through-hole technology
– Auxiliary circuit: optionally screw or spring-loaded connection
● Size S3:
– Main circuit: Screw connection with box terminal or through-hole technology
– Auxiliary circuit: optionally screw or spring-loaded connection
The conductor cross-sections of the devices in the SIRIUS modular system are matched to
one another on a size-specific basis.
Coil repeat and auxiliary switch repeat terminal
In the case of size S00 3RU21 thermal overload relays and 3RB30 / 3RB31 electronic
overload relays, direct contactor mounting involves the feed-through of the auxiliary switch
and coil terminals A2 on the contactor. This makes wiring much easier.
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