SIRIUS Size S0 power contactor, 48 V coil
It carries a 48 V rated control supply voltage at both 50 Hz and 60 Hz, and is rated for 7.5 kW at both 500 V and 690 V in AC-3 duty — meaning it handles typical 3-phase induction motors up to that power level at those line voltages.
The AC-4 rating of 12.5 A at 400 V matters if you are switching loads with frequent inching or plugging — AC-4 is the severe duty cycle for reversing and jogging, where the contacts make and break locked-rotor current. The auxiliary contact block handles 10 A at 24 V, 6 A at 230 V, and 3 A at 400 V (AC-12/AC-15 type loads), so it can drive small contactors or PLC outputs directly without an interposing relay.
Main circuit terminals are screw-type, accepting 2x (1 to 2.5 mm²) solid or 2x (2.5 to 6 mm²) stranded, with a maximum of 2x 10 mm² per terminal. The auxiliary contact terminals accept 2x (0.5 to 1.5 mm²) solid or 2x (0.75 to 2.5 mm²) stranded, max 2x (0.75 to 4 mm²). AWG equivalents for the main contacts are 2x (16 to 12) solid, 2x (14 to 10) stranded, or 1x 8. Strip lengths are standard for the terminal design — no special crimp tooling needed beyond a standard screwdriver.
Short-circuit coordination
This matters when you are designing a panel that must meet IEC 60947-4-1 coordination requirements — the 25 A fuse limit means you cannot oversize the branch protection without risking the contactor in a fault event.