The coil is rated 24 VDC, with a holding power of 2.3 W and closing power of 2.3 W — a DC coil means no AC hum and lower inrush compared to an equivalent AC coil, but verify your control transformer can supply the DC bus cleanly. Main power terminals are spring-loaded, accepting 2x (0.25 to 2.5 mm²) solid or stranded wire, or 2x (24 to 14 AWG). Spring-cage termination speeds up panel wiring and holds better under vibration than screw terminals, but requires the correct ferrule or stripped length.
Rated operational current at AC-12 (resistive load) is 10 A maximum. For motor duty, the AC-3 rating at 400 V is 4.5 kW, and at 690 V it is 5.5 kW — these are the numbers that govern real motor switching, not the resistive maximum. If your application cycles the contactor under load, this is the rating to size against. The built-in varistor surge suppressor clamps coil voltage spikes on the DC coil. This is standard for SIRIUS contactors and means you do not need an external suppression diode across the coil — but verify polarity: the varistor is polarity-sensitive. This suits most industrial enclosures but not clean-room or sealed environments without derating. Front-side protection is IP20 — finger-safe but not sealed. No forced derating for side-by-side mounting is stated, but in a densely packed panel, check the thermal rise.