What it is and what it does
The Siemens 3RH1911-1MA20-ZW97 is an auxiliary switch block with 2 normally-open contacts, used to signal the position of a main contactor or relay in a control circuit. It mounts directly on the front or side of compatible SIRIUS contactors and relays, adding status feedback for PLC inputs, indicator lamps, or interlocking logic without extra wiring to the main power path.
Sourcing and lifecycle
For a BOM line requiring this exact auxiliary block, the part is specified into the design and can be quoted to order against an RFQ.