What this 3VA2 breaker carries
The Siemens 3VA2450-7MQ32-0BL0 is a 3-pole IEC frame 630 circuit breaker with a class C breaking capacity of 110 kA at 415 V, built around the ETU860M LSIG trip unit for motor protection. Rated In = 500 A, the overload protection (Ir) is adjustable from 200 A to 500 A, short-circuit protection (Isd) from 1.2 to 15 times In, and ground-fault protection (Ig) from 0.2 to 1 times In with a time delay tg of 0.05 to 0.8 s. It includes a nut keeper kit, an undervoltage release (UVR) at 24 V DC, 2 auxiliary switches HQ, 1 trip alarm switch HQ, and 1 electrical alarm switch.
Deployment context
This breaker mounts on a DIN rail or panel in a motor control center (MCC) or distribution board, sized for a 500 A motor feeder with LSIG protection. The 110 kA interrupting rating at 415 V means it safely clears high-fault-current faults in industrial networks without upstream cascading — critical for arc-flash compliance.