Transformer protection breaker – 32 A, Class 10, SIRIUS S2
Rated 32 A at 690 V AC-3, it carries a Class 10 trip characteristic, so it will hold through a cold-start inrush but trip within 10 seconds at 7.2× rated current. That matters when you're protecting a 32 A transformer feeding a control panel or a pump station: the breaker won't pop on energization, but it will clear a bolted fault before the transformer core saturates and cooks.
The S2 footprint is 55 mm wide, 140 mm tall, 149 mm deep, and you can orient it in any position. Clearance requirements: 50 mm above and below, 140 mm in front, 30 mm to the side. That's a standard S2 envelope; if you're swapping into a panel that was laid out for the 3RV6021-4DA10, the width and depth are the same, so it drops in without re-drilling the backplate. Terminals are screw-type box terminals accepting 2× 0.75–25 mm² solid/stranded or 1× up to 35 mm²; torque to 3–4.5 N·m.
Electrical ratings in context
Rated operational current is 32 A at 690 V AC-3, and at 400 V AC-3 it's still 32 A — so the full current is available down to 400 V. The thermal overload release is adjustable (though the evidence doesn't list the range), and the magnetic short-circuit trip is fixed. Operating frequency is 50/60 Hz, switching rate up to 15 operations per hour at AC-3.
Relative humidity 10–95% non-condensing. Shock resistance 25 g / 11 ms per IEC 60068-2-27, and installation altitude up to 2 000 m without derating.