The S3 frame size means it handles the higher current range within the SIRIUS family, with stranded wire capacity up to 70 mm² on the power terminals.
Coil and control voltage: what the 20-33 V AC/DC rating means
The coil accepts both AC and DC control voltage across a 20-33 V range. That dual-voltage flexibility simplifies panel wiring — you don't need separate coil variants for AC vs DC control circuits. At 24 V rated value, the inrush current peak hits 6.5 A, with a holding draw of 3.5 VA at both 50 Hz and 60 Hz.
Mounting and clearances: panel integration notes
That helps when fitting into tight or oddly oriented enclosures. The dimensions are 140 mm high, 70 mm wide, and 152 mm deep — check your enclosure depth before committing, because 152 mm is a bit deeper than some S2 frames.
Terminal capacity and auxiliary contacts
Power terminals accept stranded wire from 6 mm² up to 70 mm² — that covers a wide range of motor feeder sizes. The coil terminals are screw-type, accepting solid or stranded conductors: 2x (0.5-1.5 mm²) or 2x (0.75-2.5 mm²). The contactor comes equipped with an auxiliary switch, so you have a feedback contact for status indication without buying a separate aux block.