The Siemens 3RH1131-2AP00-ZW95 is a SIRIUS auxiliary contactor in the S00 frame size — a compact, 45 mm wide switching block meant for control circuits, not motor power. It carries three normally-open instantaneous contacts and no NC or delayed poles, so it is a pure make-only auxiliary for signaling, interlocking, or extending the contact count on a larger contactor or relay. The coil pulls in reliably across a 0.8 to 1.1x rated voltage band at 50 Hz and 0.85 to 1.1x at 60 Hz, which means it holds in through the brownout dips that drop a tighter-coil part. Rated operational current reaches 10 A at 24 V, tapering to 6 A at 230 V and 1 A at 690 V — the usual resistive/AC-15 derating curve for a control-circuit contact block.
Fastens by screw or snaps onto DIN rail — the S00 footprint matches the standard 45 mm wide contactor slot. Depth is 73 mm, height 60 mm — check clearance to the enclosure door if you are stacking aux blocks on a contactor. Terminals accept 0.25 to 2.5 mm² solid or stranded wire — standard for control wiring up to 14 AWG.