The Siemens 3RV1991-1FA0 is a 2 m, 6-pole connecting cable for auxiliary switches on 3RV1 motor-protective circuit breakers. It links the auxiliary contact block on the breaker to the control wiring, so the panel builder doesn't run individual wires through the enclosure — one pre-assembled cable, one routing path.
This cable mates with the auxiliary switch slot on 3RV1 breakers in frame sizes S00 and S0. The 6-pole connector carries two normally-open and two normally-closed contacts (or combinations thereof) from the auxiliary switch block back to the terminal strip. The 2 m length covers most panel layouts where the breaker is DIN-rail mounted and the control terminal block sits within that reach.