The Siemens 3VM1132-4EE32-0AA0 is a SENTRON molded case circuit breaker (MCCB) rated for 320 A maximum, with a TM220 thermal-magnetic overcurrent release. It's a 3-pole unit designed for line protection — think main feeder or large branch circuit in a distribution panel. The breaking capacity at 240 V is 121 kA, dropping to 76 kA at 415 V and 53 kA at 440 V; at 500 V it's still 12 kA, so it handles industrial fault levels across common low-voltage systems. Thermal derating is gradual: it holds 32 A continuous from 40 °C through 50 °C, then steps down to 31 A at 55 °C and 60 °C, and 30 A at 65 °C and 70 °C. That means in a warm panel you lose only about 6% capacity at the top end — decent headroom for a 320 A frame.
Lifecycle & Sourcing
The 3VM1132-4EE32-0AA0 is listed as current production — no phase-out or NRND flag. That means it's still a standard catalog item from Siemens, so you can spec it into new builds without worrying about last-time-buy windows. For procurement, we source it to order against an RFQ; availability and current pricing are confirmed at quote time.
Integration & Mounting
Dimensions are 130 mm high, 76.2 mm wide, and 70 mm deep. The 3-pole footprint fits standard Siemens SENTRON panel cutouts and busbar systems. Front protection is IP40 — fine for enclosed distribution boards, but not rated for washdown or outdoor exposure. Power loss at rated current is 11 W, so ventilation in a sealed enclosure is straightforward.
Approvals & Compliance
Rated insulation voltage is 800 V, and the operating temperature range is -25 °C to 70 °C, with storage from -40 °C to 80 °C. The TM220 release is a thermal-magnetic type — no electronic trip unit, no communication function, no undervoltage release, and no ground-fault monitoring on this variant. It's a straightforward, serviceable MCCB for standard line protection duty.