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Siemens 3RB1056-1FW0 — Overload Relays

Siemens 3RB1056-1FW0 Solid-State Overload Relay, 50-200A, Cl

MPN3RB1056-1FW0

Siemens 3RB10 series solid-state overload relay, 3RB1056-1FW0, 50-200A, Class 10, for contactor mounting on 3RT105 or separate 35mm DIN rail.

Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Product details

The Siemens 3RB1056-1FW0 is a solid-state overload relay from the 3RB10 series, rated 50 to 200 A with a Class 10 trip curve. It mounts directly on a 3RT105 contactor or separately on a 35 mm standard DIN rail. The current transformer design means the power circuit passes through the relay body — no separate CT block to wire.

The S6 W. variant includes a wide-range current transformer and a through-hole design — the motor leads pass through the relay, so the overload setting is adjusted via the front dial, not by swapping CT taps.

Frequently asked questions

What is the closest pin-compatible alternative to 3RB1056-1FW0 in this component family?

Within the 3RB10 family, the 3RB1056-1FW0 is the 50-200 A Class 10 variant. Lower-current siblings (e.g., 3RB1056-1FB0 for 0.6-6 A) share the same mounting footprint and wiring scheme, but the current range differs. No direct pin-compatible alternative with identical ratings exists; the 3RB1056-1FW0 is the correct order code for the 50-200 A range.

Who supplies 3RB1056-1FW0 and how is it quoted for volume purchases?

The part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — no stock count or price is listed here.

MPN
3RB1056-1FW0