It's the part that extends the control logic of a motor starter or feeds status back to a PLC without pulling more load through the main contactor's aux block.
The 24 V DC coil draws 3.2 W to pull in and holds at the same 3.2 W — no drop in holding power, so the coil runs warm but steady. If you're swapping this into an existing panel, check that your 24 V DC supply can handle the inrush; the coil's closing power is the same as its holding power, which means no spike, but the steady draw is constant. The 4 NO contacts are rated by voltage: 10 A at 24 V, 6 A at 230 V, 3 A at 400 V, 2 A at 500 V, 1 A at 690 V. That derating curve matters — at 400 V line-to-line you're limited to 3 A through the aux contacts, so don't try to switch a 5 A pilot load at that voltage.
Size S00 frame, 45 mm wide, 60 mm tall, 73 mm deep. Screw and snap-on mounting to DIN rail. That's useful when you're shoehorning it into a crowded enclosure and need to orient the contactor to clear a busbar or duct. Wire termination accepts 2x (0.25... 2.5 mm²) solid or stranded — standard control-circuit sizing.
RoHS compliance date of 01.07.2006 is on record.