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Siemens 3RA1225-0FB23-1AM2 — Motor Starters

Siemens 3RA1225-0FB23-1AM2 SIRIUS Reversing Combination

MPN3RA1225-0FB23-1AM2

Siemens SIRIUS reversing combination starter, frame size S0, 0.35-0.5 A, 240 VAC control voltage, DIN/panel mount, UL E156943.

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

Product details

The Siemens 3RA1225-0FB23-1AM2 is a reversing combination starter from the SIRIUS family, frame size S0, rated 0.35-0.5 A with a 240 VAC control voltage. It integrates a reversing contactor pair, overload protection, and auxiliary contacts into one DIN- or panel-mount unit — one part number covers the motor-starting and reversing logic for a small three-phase motor, typically a fractional-horsepower conveyor or fan drive.

The 0.35-0.5 A current range sets the motor FLA window this starter protects.

Integration notes

The combination starter includes a main switch-disconnector (MSP) with an auxiliary contact — one SPDT NO/NC — plus a NO contact on the contactor itself. The 240 VAC control circuit is wired to the coil terminals; the reversing pair is interlocked internally, so a single control signal per direction is all that is needed. The UL file E156943, Volume 1, Section 14 covers the listing for North American installations.

Frequently asked questions

What are the exact specifications of 3RA1225-0FB23-1AM2?

It is a Siemens SIRIUS reversing combination starter, frame size S0, rated 0.35-0.5 A with a 240 VAC control voltage. It includes a main switch-disconnector with one SPDT NO/NC auxiliary contact and one NO contactor auxiliary, mounts on DIN rail or panel, and carries UL file E156943.

Is 3RA1225-0FB23-1AM2 suitable for 3-phase motors?

Yes, it is a reversing combination starter designed for three-phase motor circuits. The 0.35-0.5 A rating covers small three-phase motors in that current window.

How to wire a Siemens SIRIUS reversing starter with 240 VAC control?

The 240 VAC control voltage is applied to the coil terminals. The reversing contactor pair is internally interlocked; wire the forward and reverse control signals to the respective coil inputs. The main switch-disconnector (MSP) provides the line-side isolation, and the auxiliary contacts (one SPDT NO/NC plus one NO) are available for status feedback or interlocking. Refer to the manufacturer's wiring diagram for the exact terminal assignments.

Where can I buy 3RA1225-0FB23-1AM2 with stock?

This part is sourced to order against an RFQ. Availability and pricing are confirmed at quote time.

MPN
3RA1225-0FB23-1AM2