It provides one normally-open and one normally-closed contact, with a maximum rated current of 10 A. The current-carrying capacity depends on the operating voltage: at 24 V it handles 6 A (AC-15), at 230 V it handles 6 A, and at 400 V it handles 3 A. For DC switching, the ratings are lower — 6 A at 24 V, 2 A at 60 V, 1 A at 110 V, and 0.3 A at 220 V.
Snap-on mounting directly onto the 3RT2 contactor or contactor relay — no tools needed. The block is 10 mm wide, 57.4 mm tall, and 66 mm deep, so it adds minimal width to the contactor assembly. Screw terminals accept 2x (0.5...1.5 mm²) or 2x (0.75...2.5 mm²) solid or stranded wire, or 2x (20...16) or 2x (18...14) AWG. The front face is IP20 rated, which is standard for panel-mounted auxiliary contacts.