It's a 3-pole device rated 20 A operational current at AC-3 (motor switching duty) at 400 V, with a maximum rated voltage of 690 V AC. The instantaneous short-circuit trip responds at 260 A, so it clears a fault fast enough to protect downstream contactor and wiring without needing a separate fuse.
Dimensions: 55 mm wide, 140 mm high, 149 mm deep. The S2 frame size means it occupies the same footprint as other SIRIUS S2 breakers, so swapping in a panel that already has a 3RV2 or 3RV6 S2 is straightforward — same rail slot, same terminal spacing.
The headline number is 20 A at AC-3, 400 V — that's the motor switching current, not the resistive heating current. The 260 A instantaneous magnetic trip means it won't nuisance-trip on inrush but will catch a bolted fault.
Relative humidity during operation 10 to 95 %. Shock resistance tested to 25 g / 11 ms per IEC 60068-2-27. Installation altitude max 2 000 m above sea level. The substance prohibitance date of 07/01/2006 aligns with RoHS compliance scope — the part is RoHS-compliant as manufactured after that date.