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Siemens 3RA1125-1KA25-1AC2 — Motor Starters

Siemens 3RA1125-1KA25-1AC2 Combination Starter, 12.5A 208VAC

MPN3RA1125-1KA25-1AC2

Siemens SIRIUS, combination starter nonreversing, DIN/panel mount, frame size S0, 9 - 12.5A, 208VAC control voltage, MSP aux SPDT NO/NC, contactor aux NO front mount, UL file E156943.

Source DocumentedChannel stated on listing & quote
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Worldwide DispatchDHL/FedEx — transit quoted per order
Independent China distributor & sourcing agent· Listing updated Sep 2026

Product details

What this SIRIUS combination starter covers

The Siemens 3RA1125-1KA25-1AC2 is a nonreversing combination starter in the SIRIUS family, frame size S0, rated 9 to 12.5 A with a 208 VAC control voltage. It integrates a motor-starter protector (MSP) with one SPDT NO/NC auxiliary contact plus a contactor with one NO front-mount auxiliary. The DIN-rail or panel-mount form factor simplifies enclosure integration for IEC motor control centers.

The 9–12.5 A current range covers IEC motor loads. The 208 VAC control voltage is the coil rating for the contactor and MSP.

Approvals and standards compliance

Listed under UL file E156943 in volume 1 section 14, confirming UL acceptance for North American installations.

Frequently asked questions

Is 3RA1125-1KA25-1AC2 compatible with 208VAC control voltage?

Yes — the control voltage is specified as 208 VAC, matching the coil rating of the MSP and contactor inside the combination starter.

What are the auxiliary contacts on 3RA1125-1KA25-1AC2?

The MSP carries one SPDT (NO/NC) auxiliary contact, and the contactor adds one normally-open front-mount auxiliary. That gives one changeover signal plus one NO signal for feedback or interlock use.

What is the difference between 3RA1125 and 3RA1126?

The 3RA1125 is a nonreversing combination starter; the 3RA1126 is the reversing version. Both share the S0 frame and similar current ranges, but the 3RA1126 includes a mechanical interlock and two contactors for forward/reverse motor control.

Where can I buy 3RA1125-1KA25-1AC2 available via RFQ confirmation?

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

MPN
3RA1125-1KA25-1AC2