Motor protection MCCB with integrated undervoltage release
The Siemens 3VA2450-7MN32-0CC0 is a SENTRON molded case circuit breaker (MCCB) designed specifically for motor protection — it includes phase failure detection and an integrated undervoltage release (UVR) as standard, so it drops the motor on loss of control voltage without needing a separate relay. Rated 500 A continuous at 40 °C (derated to 480 A at 70 °C), this 3-pole breaker carries the full motor FLA for large pumps, compressors, or conveyors in a 248 × 138 × 110 mm (H × W × D) footprint — fits standard 138 mm wide panel cutouts for 3-pole MCCBs. Breaking capacity reaches 330 kA at 240 V AC, dropping to 242 kA at 415/440 V and 187 kA at 500 V — sufficient for high-fault utility feeds or transformer secondaries. At 690 V the rating is 15.3 kA, so verify coordination if applied on 690 V systems.
Thermal management and operating range
Maximum power loss is 101.5 W — account for this heat in a sealed enclosure; the breaker is rated for operation from -25 °C to 70 °C ambient, with storage from -40 °C to 80 °C. The short-time withstand rating is 6 kA limited to 1 second — relevant for selectivity studies where downstream breakers clear faster than the MCCB's thermal trip.
Sourcing and lifecycle
The base switch variant is 3VA2450-7MN32-0AA0; this -0CC0 suffix adds the undervoltage release and two auxiliary switches HQ (high-auxiliary count). No communication function is fitted on this variant.