What the contacts mean for your circuit
The 3RH1911-1FC22-ZW97: The 2NO+2NC contact arrangement gives you two independent signal paths for feedback or interlocking. On a motor starter, one NO pair typically reports the main contactor state to a PLC, while the NC pair blocks a downstream starter from energizing until this one drops out. The 2U designation indicates the contact arrangement per DIN EN50005 — the contacts are electrically isolated from each other, so you can mix control voltages on the same block.
Panel integration and packing
The block clips directly onto the front of the contactor or contactor relay — no tools needed for mounting, just a screwdriver for the terminals. This variant ships in multi-unit packing of 140 pieces, which is the standard bulk pack for panel builders running multiple identical starters.