The Siemens SENTRON 3VM1150-5MH32-0AA0 is a 3-pole molded case circuit breaker (MCCB) with a TM120M thermal-magnetic overcurrent release. It is rated 50 A continuous at 40 °C ambient and carries a maximum breaking capacity of 187 kA at 240 V AC, stepping down to 121 kA at 415 V, 76 kA at 440 V, and 17 kA at 500 V — the voltage on your distribution bus determines the interrupting rating that applies.
Rated current and thermal derating
The 50 A rating holds flat from 40 °C through 50 °C ambient. Above that it derates: 49 A at 55 °C, 48 A at 60 °C, 46 A at 65 °C, and 45 A at 70 °C. If your panel internal temperature runs above 50 °C, size the load or the breaker for the derated figure — the nameplate 50 A applies only up to that point.
Panel fit and integration
The 3VM1150-5MH32-0AA0 measures 130 mm high, 76.2 mm wide, and 70 mm deep. Front protection is IP40, suitable for enclosed panel mounting where no water ingress is expected. The TM120M release has an adjustable short-circuit pickup up to 800 A (li max.), and the breaker accepts an optional motor drive for remote operation.