It's the switching element for control circuits — think PLC outputs driving motor contactor coils, or signal routing in a safety chain. The AC coil pulls 37 VA on pick-up and holds at 5.7 VA, so the control transformer needs to handle that inrush without dropping below the 0.8× rated voltage window.
That covers most panel layouts without derating.
Auxiliary contacts are rated for AC-12 at 6 A and AC-15 at 230 V at 10 A — that covers pilot duty for most contactor coils and solenoid valves. At 24 V DC the contacts handle 6 A; at 110 V DC it drops to 3 A, and at 220 V DC to 1.2 A. The DC-13 rating at 1 000 operations per hour tells you the contacts are designed for inductive DC loads like brake coils, not just resistive.