What this part is and what it does
The Siemens SIRIUS 3RH1911-1GA22-ZW98 is a 4-pole auxiliary switch block with 2 normally-open and 2 normally-closed instantaneous contacts, designed for use with contactor relays and power contactors in the SIRIUS family. It mounts via snap-on onto a 35 mm DIN rail per EN 50022, making it a direct add-on for SIRIUS contactor assemblies without additional hardware. Rated for a maximum of 10 A, with switching capacity derated by voltage: 6 A at 24 V, 6 A at 125 V, 6 A at 230 V, 3 A at 400 V, and 0.3 A at 220 V. The AC-15 rating at 690 V is 1 A.
Key electrical and mechanical ratings
The block carries a rated insulation voltage of 690 V at pollution degree 3, and a surge voltage resistance of 6 kV. Contact reliability is specified as 1 faulty switching per 100 million operations at 17 V, 1 mA. Mechanical service life is rated at 10 million switching cycles typical. Operating temperature range is -25 to +60 °C; storage range is -55 to +80 °C. Connections are screw-type terminals accepting 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²) with core-end processing, or 2x (20 to 16) and 2x (18 to 14) AWG. Front protection class is IP20, suitable for enclosed panel mounting where the front face is accessible but the wiring area is behind a cover.
Physical dimensions and mounting
Dimensions are 36.5 mm wide, 37.5 mm high, and 41.5 mm deep — a compact footprint that fits alongside SIRIUS contactors on the same DIN rail without exceeding the panel depth budget. Snap-on mounting onto 35 mm standard mounting rail per DIN EN 50022 allows tool-less installation and removal for panel rework.