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Siemens 3RA1120-1KA25-0AV6 — Motor Starters

Siemens 3RA1120-1KA25-0AV6 Combination Starter, 9-12.5A

MPN3RA1120-1KA25-0AV6

Siemens SIRIUS S0 nonreversing combination starter, 3RA1120-1KA25-0AV6, 9-12.5 A setting range, 24 VDC control voltage, DIN/panel mount, UL listed.

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

Product details

What this combination starter is

The Siemens 3RA1120-1KA25-0AV6 is a nonreversing combination starter from the SIRIUS S0 frame family, integrating a contactor and motor protection in one DIN-rail or panel-mount package. It's sized for IEC motor loads in the 9 to 12.5 A range — that's the overload relay setting window, so you set the dial to match the motor FLA, not the breaker trip.

Control voltage and wiring

Control voltage is 24 VDC, not 24 VAC — the coil is DC-rated, so don't feed it AC unless you want a smoking solenoid. The description notes no auxiliary contact on the MSP or the contactor side, so if your safety circuit or PLC needs a feedback signal, plan for an external auxiliary block or a separate monitoring relay. Spring-cage terminals on the SIRIUS S0 accept 0.2–2.5 mm² solid or ferruled stranded; strip length 8 mm.

Approvals and deployment context

UL file E156943 in Vol.1 Sec.14 is on record, so the starter carries UL listing for North American panel builds. No auxiliary contacts means the panel builder wires the start/stop directly to the coil terminals.

Frequently asked questions

What is the current setting range of 3RA1120-1KA25-0AV6?

The overload relay setting range is 9 to 12.5 A. That's the adjustable trip window for the motor protection element — set it to the motor's full-load amperage, not the supply breaker rating.

What control voltage does 3RA1120-1KA25-0AV6 require?

24 VDC. The coil is DC-rated; 24 VAC will not hold it in and may damage the solenoid. No auxiliary contacts are included on the MSP or contactor.

Is the 3RA1120-1KA25-0AV6 a reversing or nonreversing starter?

Nonreversing. It's a single-direction combination starter — no reversing contactor pair inside the S0 frame. For reversing duty you'd need a separate reversing assembly or a larger frame.

Is 3RA1120-1KA25-0AV6 suitable for 24V AC control?

No. The control voltage is 24 VDC. Feeding 24 VAC to a DC coil will not provide reliable pickup and can overheat the coil. Use a 24 VDC supply.

MPN
3RA1120-1KA25-0AV6