Mounting
7.3 Mounting/Disassembly
SIRIUS 3RU thermal overload relays / SIRIUS 3RB electronic overload relays
88 Manual, 09/2016, A5E03656507420A/RS-AB/003
Thermal and electronic overload relays (S2 / S3)
Direct mounting on 3RT contactor (sizes S2 and S3)
The diagram below shows an example mounting scenario based on mounting the 3RB3
electronic overload relay (size S3) on the 3RT2 contactor. The contactor/overload relay
combinations can be snapped onto 35 mm DIN rails according to EN 60715 and 75 mm DIN
rails (size S3 only).
Mounting and disassembling size S2 devices is equivalent to the procedure described for
size S3.
3RB3 electronic overload relay installation
Push the overload relay into the contactor from below. Attach the hook on the overload relay to
the opening on the underside of the contactor. This pushes the main current contacts into the
corresponding socket contacts on the contactor.
Screw the main conductor terminals tight on the contactor. Check that the cable is clamped
Position the contactor/relay combination on the top edge of the DIN rail and press it down until
it snaps onto the bottom edge of the DIN rail.
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