The 45 mm width and 85 mm height fit standard panel layouts, with a depth of 97 mm.
The headline rating is 21 A at 480 V, which governs its use on 480 V motor circuits — that is the current it can make and break under AC-3 duty at that voltage. Mechanical life is 10,000,000 cycles typical, so this contactor outlasts most panel refreshes. The coil terminals are screw-type, and main contact torque is 16 to 8 Nm — a range that accommodates both copper and aluminium lugs. Wire sizes accepted: solid or stranded 1 to 10 mm² for main power, and 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²) for auxiliary circuits.
The Size S0 footprint is shared across the SIRIUS 3RT2 range, so auxiliary blocks and overload relays from the same family fit without adapters.