Siemens Sirius Innovation Support for use with 3RB30 Series, 3RB31 Series, 3RU21 Series

Switch position indicator and test function
STOP button
Selector switch for manual/automatic reset
Screw connection or Spring-clamp versions
Impulse voltage resistance 6 kV
Insulation voltage 690V
Surface or DIN-rail stand-alone mounts available, see 706-1699 etc

The 3RU21 thermal overload relays up to 80 A have been designed for current-sensitive protection of loads with normal starting.
These thermal overload relays for use with Sirius Size S0 & S00 Contactors

Screw terminals can only be used with screw terminal overloads and spring terminals can only be used with spring terminal overloads.

CE, UL, CSA