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Siemens 3RH1921-1XA31-0MA3-ZX95 — Contactors

Siemens 3RH1921-1XA31-0MA3-ZX95 SIRIUS Auxiliary Contact Blo

MPN3RH1921-1XA31-0MA3-ZX95

Siemens SIRIUS 3RH1921-1XA31-0MA3-ZX95, attachable auxiliary contact block, 4-pole 3 NO + 1 NC, screw terminals, EN 50012, phased-out.

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

Product details

The Siemens 3RH1921-1XA31-0MA3-ZX95 is a SIRIUS-series attachable auxiliary contact block, 4-pole with 3 normally-open and 1 normally-closed contacts, terminated via screw terminals. It mounts to contactors and other switching devices on EN 50012 profiles — the standard 35 mm DIN rail footprint common across SIRIUS S00, S0, and S2 sizes. The 3 NO + 1 NC arrangement gives you three make-signal paths for feedback, interlocks, or PLC inputs and one break path for a safety or stop circuit, all in a single add-on block that clips onto the front of the base contactor.

The block attaches to the front of a SIRIUS contactor or relay via the standard EN 50012 interface. Screw terminals accept solid or stranded copper: 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), and 2x 4 mm². The 3 NO + 1 NC contact arrangement is wired identically to the older 3RH1 blocks — no rewiring of the base contactor required if you are swapping a failed block. The 3RH2 successor uses the same mounting profile and terminal layout, so a panel designed for the 3RH1921-1XA31-0MA3-ZX95 can accept the 3RH2422-1AB00 (2 NO + 2 NC) without drilling or rail changes, though the contact configuration differs.

Frequently asked questions

What replaces the 3RH1921-1XA31-0MA3-ZX95?

The official Siemens successor is the SIRIUS 3RH2 series. The closest functional drop-in from that family is the 3RH2422-1AB00, which is a 2 NO + 2 NC block. It shares the same EN 50012 mounting profile, screw terminal layout, and overall dimensions (depth 73 mm, width 90 mm, height 57.5 mm), so it fits the same panel footprint without rewiring the base contactor. The contact arrangement differs — you lose one NO and gain one NC — so verify your circuit logic before swapping.

Will the 3RH1921-1XA31-0MA3-ZX95 fit a panel designed for the 3RH2422-1AB00?

Yes, mechanically it is a direct fit. Both blocks mount to the same EN 50012 DIN-rail interface and use screw terminals with identical wire ranges. The 3RH1921-1XA31-0MA3-ZX95 has 3 NO + 1 NC versus the 3RH2422-1AB00's 2 NO + 2 NC, so the wiring of the contact block itself differs, but the panel cutout, rail position, and terminal numbering are compatible.

What compliance documentation is available for this part?

The evidence does not list specific compliance certificates. As a Siemens SIRIUS product, it typically carries CE marking for the European market and is designed to EN 50012 and IEC standards. For RoHS, REACH, or UL documentation specific to this order code, include the request with your RFQ so we can verify with the supply source.

MPN
3RH1921-1XA31-0MA3-ZX95