The Siemens 3RH1911-1FC22-ZW96 is an auxiliary switch block with 2 normally-open and 2 normally-closed contacts, wired via screw terminals. It mounts on size S00 contactor relays and contactors used for switching motor loads, following the DIN EN50005 switching-element arrangement standard.
Integration Note
The block clips onto the front of a size S00 contactor or contactor relay, adding auxiliary signaling or interlocking without increasing the panel's DIN-rail footprint.