320 A, 4-pole MCCB with TM220 release — what the ratings mean for fit
The SENTRON 3VM1332-4EE42-0AA0 is a 4-pole molded case circuit breaker (MCCB) rated for line protection, carrying a TM220 thermal-magnetic release. The 320 A continuous current rating holds flat from 40 °C through 50 °C (cites:,), then derates linearly to 292 A at 70 °C (cites:,) — so in a warm enclosure you size against the 70 °C figure, not the 320 A headline. The interrupting ratings are 121 kA at 240 V AC (cite:), 76 kA at 415 V and 440 V AC (cites:,), and 53 kA at 500 V AC (cite:); these are the SCCR values for selectivity studies. The 800 V rated insulation voltage (cite:) and 690 V AC / 500 V DC max operating voltages (cites:,) cover standard 480/277 V and 600 V distribution panels.
Panel integration and physical fit
The 3VM1332-4EE42-0AA0 measures 110 mm deep, 184 mm wide, and 248 mm high (cites:,). The IP40 front protection (cite:) means the breaker face is sealed against solid objects over 1 mm but not against moisture — suitable for indoor panel mounting where the enclosure provides the overall IP rating. The 80 W maximum power loss (cite:) should be factored into the panel thermal budget; a 4-pole MCCB at full load dissipates that heat into the enclosure.