The Siemens 3VA2450-5MP32-0DH0 is a 3-pole IEC frame 630 molded case circuit breaker (MCCB) with a 55 kA breaking capacity at 415 V (class M). It carries a motor-protection ETU550M trip unit with LSI protection (long-time, short-time, instantaneous) and a rated current In of 500 A. Overload protection is adjustable from 200 A to 500 A; short-circuit protection ranges from 1.2 to 15 times In for the short-time pickup, and 3 to 15 times In for the instantaneous pickup.
The 500 A frame and adjustable overload (200–500 A) let you size it to a specific motor full-load current, not just a fixed rating.
Deployment context
This MCCB mounts in a switchboard or motor control center (MCC) via its busbar connection — typical for protecting large motors, feeders, or distribution branches in industrial plants. The undervoltage release provides automatic trip on loss of control voltage, a common requirement for safety circuits and coordinated shutdown sequences.