SENTRON 3VM1180-4EE32-0AA0 — 80 A MCCB with TM220 Release
The Siemens 3VM1180-4EE32-0AA0 is a 3-pole SENTRON molded case circuit breaker (MCCB) rated 80 A at 40 °C, designed for line protection in distribution panels. It carries a TM220 thermal-magnetic release — the thermal element handles overloads, the magnetic element clears short-circuits — and delivers a breaking capacity of 121 kA at 240 V AC, stepping down to 76 kA at 415 V, 53 kA at 440 V, and 12 kA at 500 V. That voltage-dependent curve means the breaker is sized for low-voltage mains where high fault current is expected at the service entrance; the 121 kA figure at 240 V covers the worst-case bolted fault on a 240 V delta or split-phase secondary. Rated insulation voltage is 800 V, and the front face carries IP40 protection — suitable for enclosed panel mounting where tools or fingers won't contact live parts. Maximum power loss is 19 W, which matters for thermal budgeting inside a sealed enclosure with other heat-generating devices.
Thermal Derating and Ambient Temperature
The breaker holds its full 80 A rating from 40 °C through 50 °C. Above that, derating is gradual: 78 A at 55 °C, 77 A at 60 °C, 75 A at 65 °C, and 74 A at 70 °C. If the panel ambient runs hot — say, a packed enclosure near a furnace line — the 70 °C figure (74 A) is the actual continuous current the breaker can carry without nuisance tripping. The TM220 release's thermal element responds to I²t heating, so ambient temperature directly shifts the trip curve; the derating table is the manufacturer's pre-validated compensation.
Panel Fit and Integration
Dimensions are 130 mm height, 76.2 mm width, 70 mm depth. The 3-pole footprint matches the standard SENTRON 3VM family cutout; if you are swapping a failed breaker in an existing panel, measure the mounting base — the 70 mm depth leaves clearance for rear-connected busbars or cable lugs. No undervoltage release, no shunt trip, no communication function — this is a plain thermal-magnetic breaker for straightforward line protection.