It provides 2 normally open and 2 normally closed contacts (2 NO + 2 NC), wired via screw-type terminals, and snaps onto the contactor without tools. Contact ratings vary by voltage and duty: the maximum continuous current is 10 A, with specific ratings at 24 V (6 A), 60 V (2 A), 110 V (1 A), 125 V (6 A), 220 V (0.3 A), 230 V (6 A), 250 V (6 A), and 400 V (3 A). For AC-15 inductive loads, ratings are 10 A at 24 V, 4.7 A at 60 V, 3 A at 110 V, 1.2 A at 220 V, 0.5 A at 440 V, and 0.26 A at 600 V.
If you are open to the successor, the 3RH2911-1FC22 is a direct drop-in replacement with the same footprint and wiring.
Snap-on mounting onto the contactor — no DIN rail required. The block measures 36.5 mm wide, 37.5 mm high, and 41.5 mm deep, fitting the S00 frame size of SIRIUS contactors. Screw terminals accept 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²) with core end processing, or 2x (20 to 16) and 2x (18 to 14) AWG. Front protection is IP20, suitable for enclosed panels. The leading and lagging contact arrangement is 2 each, with no instantaneous contacts.