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Siemens 3RB1055-1FG0 — Overload Relays

Siemens 3RB1055-1FG0 Electronic Overload Relay, 50-200A, Cla

MPN3RB1055-1FG0

Siemens SIRIUS 3RB1055-1FG0 electronic overload relay, adjustable 50...200 A, Class 10, size S6, 35 mm DIN-rail mount, manual reset.

$281.97Ref. price · indicative, final on quote
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

3RB1055-1FG0 — Mechanical
ParameterValue
Weight0.01 kgs

Product details

The Siemens 3RB1055-1FG0 is a solid-state electronic overload relay covering 50 to 200 A, Class 10 trip curve, in size S6. That 50-200 A range covers a lot of ground — think 22 kW to 90 kW motors at 400 V, depending on full-load amps.

Mounting and integration — contactor mount or standalone

This relay mounts directly onto the 3RT105 contactor series via the included connecting bars, or you can install it standalone on 35 mm top-hat DIN rail. Manual reset is standard — you walk up, hit the reset button, the line starts again. No auto-reset surprises on a conveyor restart. The size S6 frame is the largest in the 3RB10 family; plan for the panel footprint accordingly.

Frequently asked questions

What's the current range and trip class?

Adjustable from 50 to 200 A, with a Class 10 trip characteristic. That's the standard protection curve for general-purpose induction motors — fast enough to clear a locked rotor, forgiving enough for normal starting duty.

Does this mount directly to a contactor or does it need a separate base?

Both options are built in. It comes with connecting bars for direct mounting onto a 3RT105 contactor, or you can snap it onto a 35 mm DIN rail for standalone installation. Manual reset is the only reset mode — no toggle to auto.

MPN
3RB1055-1FG0