The Siemens SENTRON 3VM1332-4ED32-0AA0 is a 3-pole molded case circuit breaker (MCCB) rated for 320 A continuous current at 40 °C, designed for line protection in distribution panels and switchboards. Its TM210 thermal-magnetic release provides fixed overload and short-circuit protection, with a maximum breaking capacity of 121 kA at 240 V AC and 76 kA at 415 V AC — sufficient for high-fault utility feeds and large motor branch circuits.
Breaking Capacity and Thermal Derating
The interrupting ratings span from 121 kA at 240 V down to 53 kA at 500 V, so the same frame covers a wide range of available fault currents without needing a higher-rated upstream breaker. Continuous current holds flat at 320 A from 40 °C through 50 °C, then derates to 292 A at 70 °C — meaning the breaker can be applied near its nameplate rating in most ventilated enclosures without oversizing. Rated insulation voltage is 800 V and operating voltage is 690 V AC.
Mounting and Integration
The breaker measures 138 mm wide, 248 mm tall, and 110 mm deep — a 3-pole frame that fits standard switchboard and panelboard mounting patterns without special adapters. Front face carries an IP40 protection rating, suitable for general indoor panel environments where tools or fingers won't contact live parts. Maximum power dissipation is 80 W at rated load, so panel thermal calculations should account for that heat — particularly in sealed or compact enclosures.