Front-mounted auxiliary switch for SIRIUS contactor relays
The Siemens 3RH1911-2FA22-0MC0 is a front-mounted auxiliary switch block for the SIRIUS 3RT101..-.K...-0LA0 contactor relay series, adding 2 NO + 2 NC contacts with spring-loaded terminals. At 400 V DC it handles 3 A. For AC-15 duty at 690 V it's rated 1 A — this is the rating that matters for switching inductive loads like contactor coils in a 690 V panel.
Field wiring and panel fit
Snap-on mounting to DIN rail, with dimensions 46 mm deep, 36.5 mm wide, 37.5 mm high — fits the standard SIRIUS contactor footprint. Front IP20 protection means it's safe for panel interior use where no one touches live parts; the insulation voltage is rated 690 V at pollution degree 3, appropriate for industrial control panels.