Siemens SENTRON 3VA2450-7MN32-0AE0 — 500 A MCCB for Motor Protection
The Siemens SENTRON 3VA2450-7MN32-0AE0 is a 3-pole molded case circuit breaker (MCCB) designed specifically for motor protection, carrying a continuous current rating of 500 A at 40 °C and derating to 480 A at 70 °C. Its interrupting capacity reaches 330 kA at 240 V, 242 kA at 415 V, and 187 kA at 500 V — numbers that govern selectivity and SCCR coordination in high-fault industrial distribution. The unit includes phase failure detection and ships with 4 HQ auxiliary switches (the basic switch variant is 3VA2450-7MN32-0AA0).
What the Ratings Mean for Your Panel
The 500 A frame at 40 °C is the continuous thermal rating — sized for a motor full-load current in that range, with a 5 A step-down at each 5 °C rise above 55 °C (495 A at 55 °C, 490 A at 60 °C, 485 A at 65 °C, 480 A at 70 °C). The 330 kA interrupting at 240 V is the maximum fault current the breaker can safely clear; at 690 V that drops to 15.3 kA, so verify the available fault current at your service voltage. The 3-pole design with phase failure detection means the breaker trips on loss of any phase — critical for preventing single-phasing damage on a motor load. Maximum power loss of 99 W factors into enclosure thermal rise calculations.
Integration and Mounting
Mounts in a standard panel or enclosure — dimensions are 248 mm high, 138 mm wide, 110 mm deep. The 4 HQ auxiliary switches provide status feedback to a PLC or annunciator. No undervoltage release or communication function is fitted on this variant; those are separate accessory options. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C.