The Siemens SENTRON 3VA1225-5EE32-0AA0 is a 3-pole molded case circuit breaker (MCCB) rated for 250 A continuous at 40 °C, with a TM220 thermal-magnetic overcurrent release — the '22' indicating the magnetic trip is fixed at 220 A. It's designed for line protection in distribution panels where you need high fault interruption: 187 kA at 240 V, 121 kA at 415 V, and still 17 kA at 690 V.
Interrupting ratings and thermal derating
That 187 kA at 240 V is the headline — this breaker handles heavy fault current without upstream cascading. At 415 V it still clears 121 kA, which covers most industrial secondary distribution. The thermal curve is flat from 40 °C to 50 °C (full 250 A), then drops to 243 A at 55 °C, 237 A at 60 °C, 230 A at 65 °C, and 223 A at 70 °C. If this panel lives in a hot mezzanine, size the load for the derated value at your ambient.
Mounting and panel fit
The breaker measures 105 mm wide, 158 mm tall, and 70 mm deep — a standard 3-pole MCCB footprint for DIN-rail or screw-mount panels. Front IP40 means it's protected against tools and wires larger than 1 mm, but not sealed against hose-down; keep it inside a panel enclosure. Rated insulation voltage is 800 V, so it's comfortable on 480 V and 600 V systems.