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Siemens 3RA1125-4BA26-1BB4 — Motor Starters

Siemens 3RA1125-4BA26-1BB4 Combination Starter, 14-20A

MPN3RA1125-4BA26-1BB4

Siemens SIRIUS 3RA1125-4BA26-1BB4, IEC combination starter, non-reversing, DIN/panel mount, S0 frame, 14-20 A, 110 VDC control voltage, with MSP aux-1 SPDT NO/NC and contactor aux-1 NO front mount.

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

Product details

What this combination starter packs

The Siemens 3RA1125-4BA26-1BB4 is an IEC combination starter — a non-reversing unit that integrates a contactor and overload relay into one SIRIUS S0 frame package, rated for 14 to 20 A with a 110 VDC control voltage. The auxiliary contact configuration is a mixed set: one MSP auxiliary switch provides a SPDT (NO/NC) contact, and the contactor carries an additional NO auxiliary contact mounted on the front. That gives you one NO/NC pair plus one dedicated NO for feedback or status signaling without adding a separate aux block. UL file E156943 in Volume 1, Section 14 covers this unit for North American installations, so it meets the acceptance criteria for UL 508A panels.

Frequently asked questions

Is the 3RA1125-4BA26-1BB4 a non-reversing or reversing starter?

It is a non-reversing combination starter. The description explicitly states NONREVERSING, so it drives a motor in one direction only. For reversing duty you would need a different order code with two contactors mechanically interlocked.

Does the 3RA1125-4BA26-1BB4 include both a contactor and overload relay?

Yes, as a combination starter it integrates both the contactor and the overload relay into a single SIRIUS S0 frame unit. The 14-20 A range on the description covers the overload setting range.

What is the auxiliary contact configuration on the Siemens 3RA1125-4BA26-1BB4?

It carries an MSP auxiliary contact block with one SPDT (one NO plus one NC) and a separate NO auxiliary contact mounted on the front of the contactor. That totals one NO/NC pair plus one additional NO.

MPN
3RA1125-4BA26-1BB4