It snaps onto contactor relays and power contactors in the S0 through S12 frame sizes, per the EN 50005 mounting standard. The 'with 3RT1' note on the line item indicates this block is designed to pair with the 3RT1 contactor family — it's the add-on contact module, not a standalone contactor.
At 400 V the rating drops to 3 A, and at 690 V it's 1 A — the insulation voltage is rated 690 V with pollution degree 3, so this block can live in a standard industrial panel without extra creepage spacing.
Physical Integration and Wiring
Dimensions are 44 mm wide, 38 mm high, and 51 mm deep — it occupies the same width as the S0 contactor it mounts on. The spring-loaded terminals accept 2x 0.5 to 2.5 mm² without ferrules, or 2x 0.5 to 1.5 mm² with ferrules. AWG equivalents are 2x 20 to 14.