What this MCCB is and what it does
The Siemens SENTRON 3VM1150-4EE32-0AA0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection. It carries 50 A continuously at 40 °C ambient, with a slight derating curve: 49 A at 55 °C, 48 A at 60 °C, 46 A at 65 °C, and 45 A at 70 °C. The TM220 thermal-magnetic trip unit handles overload and short-circuit protection without an electronic trip or communication function. Interrupting capacity is specified per voltage: 121 kA at 240 V AC, 76 kA at 415 V AC, 53 kA at 440 V AC, and 12 kA at 500 V AC. The insulation voltage rating is 800 V. For DC switching capacity values, the manufacturer directs to the 3VA Molded Case Circuit Breaker Manual.
Panel fit and environmental limits
Dimensions are 130 mm height, 76.2 mm width, and 70 mm depth. Front protection class is IP40, suitable for enclosed panel mounting where no water ingress is expected. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. Maximum power loss is 15 W.