It adds four normally-open instantaneous contacts for signal feedback or interlocking in motor control circuits. Rated for 10 A at 24 V for AC-12 duty, it handles control-circuit switching across a range of voltages — 6 A at 24 V, 2 A at 48 V, 1 A at 110 V, and 0.3 A at 250 V — so the same block works from 24 VDC control loops up to 250 VAC pilot circuits. The surge voltage resistance is rated at 6 kV, and the contacts are mirror contacts per IEC 60947-4-1 when used with the 3RT1 contactor series, meaning a welded contact won't go undetected in safety circuits.
Snaps directly onto the front of an S00 contactor — no tools, no DIN rail space consumed. The block measures 36.5 mm wide by 41.5 mm deep by 37.5 mm tall, so it adds minimal depth to the contactor assembly inside the panel. Terminals accept 2x (0.5 to 1.5 mm²) solid or 2x (0.75 to 2.5 mm²) stranded, or 2x (20 to 16) AWG. Finely stranded with ferrules is the same range. Strip length follows standard practice for spring-cage terminals.
The mechanical service life is rated at 10 million operating cycles typical, and contact reliability is 1 fault per 100 million operations at 17 V, 1 mA.