It's the part you add to a contactor or a reversing starter when you need more NO auxiliary circuits — think status feedback to a PLC, interlocking, or signaling a valve position.
The 10 A at 24 V rating is the key figure for control-circuit switching — that covers most PLC output cards and relay coils you'll find in a standard 24 VDC panel. At 230 V AC, it's rated 6 A, which handles motor contactor coils and small solenoid valves. The mechanical life of 10 million operations means this contactor won't be the weak link in a high-cycle application like a pick-and-place line or a packaging machine running 24/7.
The 45 mm width and 70 mm height fit the S00 footprint, which is the standard compact auxiliary contactor size across the SIRIUS family.