SIRIUS 3RU thermal overload relays / SIRIUS 3RB electronic overload relays
Manual, 09/2016, A5E03656507420A/RS-AB/003
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Mounting options
3RU21, 3RB20 / 3RB21 and 3RB30 / 3RB31 installation options
The 3RU2 thermal overload relays and the 3RB2 / 3RB3 electronic overload relays are
matched electrically and mechanically to 3RT contactors. As a result, direct mounting can be
achieved easily. Alternatively, the devices are suitable for stand-alone assembly. 3RB2 /
3RB3 electronic overload relays with through-hole technology offer an even simpler
installation option. The cable is threaded through and fitted directly on the contactor. 3RB2 /
3RB3 electronic overload relays with through-hole technology are available from size S2
onwards.