What it is and where it fits
The Siemens 3RH1911-1FC22-ZW95 is an auxiliary switch block with 2 normally-open and 2 normally-closed contacts, wired via screw terminals. It mounts on Size S00 contactor relays and contactors used for switching motor loads, following the DIN EN50005 actuation standard. The block adds four auxiliary contacts to the base contactor — two NO, two NC — for feedback, interlocking, or control-circuit extension. Screw termination suits panel builds where ring-tongue or fork terminals are preferred over spring-cage.
Lifecycle and sourcing
For a BOM line that calls out 3RH1911-1FC22-ZW95, the current lifecycle status removes the urgency of a last-time buy. The part is sourced to order against an RFQ; availability and current pricing are confirmed at quote time.
Integration note
Size S00 is the smallest frame in the Siemens 3RH2 contactor relay family. The auxiliary block clips onto the front of the relay without increasing the panel footprint — no extra DIN-rail space needed. Screw terminals accept 1 x 0.5–2.5 mm² or 2 x 0.5–1.5 mm² conductors.