MCCB for high-fault panel protection
The Siemens SENTRON 3VM1332-5ED32-0AA0 is a 3-pole molded case circuit breaker rated for line protection, with a TM210 thermal-magnetic release and a continuous current of 320 A at 40 °C through 50 °C, derating to 292 A at 70 °C. Its interrupting capacity reaches 187 kA at 240 V AC, 121 kA at 415 V and 440 V AC, and 76 kA at 500 V AC — figures that place it in the high-fault tier for main or feeder breakers in industrial switchboards where available fault current exceeds 100 kA. Rated insulation voltage 800 V; max operating voltage 690 V AC or 500 V DC.
The 320 A rating holds flat from 40 °C to 50 °C ambient; above that it drops 1.4 A per degree, reaching 292 A at 70 °C. For a panel that runs at 55 °C, the usable current is 313 A — a 2.2 % reduction that may affect coordination with downstream devices.