What it is and what it does
The Siemens 3RH1131-1AN60 is a SIRIUS auxiliary contactor in frame size S00 — a compact, snap-on module that mirrors the contactor it rides with, switching signal and control loads rather than motor power. It carries three normally-open instantaneous contacts — no leading, lagging, delayed, or make-before-break timing — so it closes and opens with the main contactor's armature, not sequenced. Rated for 10 A at 24 V, 6 A at 230 V, 3 A at 400 V, and 1 A at 690 V, the current capacity drops as circuit voltage climbs — a standard contact derating curve that matters when you're switching a 400 V control transformer secondary or a 690 V panel indication lamp.
Panel fit and mounting
Mounts via screw or snaps onto a DIN rail — the S00 footprint is the smallest Siemens contactor frame, so this auxiliary block takes 45 mm width and 57.5 mm height on the rail, with 72 mm depth including the terminals. The mounting surface allows ±180° rotation on a vertical plane and ±22.5° tilt forward/backward, which gives flexibility in crowded enclosures where the rail isn't perfectly aligned. IP20 on the front face means finger-safe from the panel door side; pollution degree 3 assumes a conductive environment typical of industrial control panels.
Contact ratings and reliability
Contact reliability is specified as one incorrect switching operation per 100 million cycles at 17 V, 1 mA — a dry-circuit rating that matters for PLC inputs or low-energy signal paths where oxide films on silver contacts can cause intermittent opens. The mechanical endurance is 30 million switching operations typical for the contactor frame, which is the service life before the spring set or armature wears out — not the electrical life under load, which will be shorter depending on the switched current. Surge voltage resistance is rated at 6 kV.