It's the part that mirrors the main contactor's state or sequences a secondary circuit — think interlocking a fan with a pump starter, or feeding a status signal back to a PLC input. Rated for 10 A at 24 V and 10 A at 230 V, it handles the control-circuit loads you'd expect in a 400 V panel: pilot lights, solenoid valves, small relays. The contact ratings drop at higher voltages — 3 A at 400 V, 0.5 A at 440 V, 0.26 A at 600 V — so watch your circuit voltage when sizing it for a 480 V line.
RoHS date of 10/01/2009 is on file. Pollution degree 3 rating suits industrial environments with conductive pollution.
Integration notes
The depth of 73 mm is the front-to-back dimension including the terminals; make sure your enclosure depth clears that plus the bend radius of the connected cables. The spring-cage terminals (assuming standard SIRIUS design) hold the wire without retightening, but strip length and ferrule size matter — 8 mm strip is typical for this class. Keep the side clearance of 6 mm and forward/backward spacing of 10 mm for airflow and tool access.