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.
What the ratings mean for fit
The 55 kA Icu at 415 V means this breaker safely interrupts fault currents up to that level without failing — critical for high-fault-capacity industrial panels where upstream transformers can deliver tens of kiloamps. The ETU550M electronic trip unit gives you adjustable LSI curves, so you can coordinate with downstream motor starters and avoid nuisance trips during motor start-up. 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. The busbar connection and included undervoltage release (208–230 V AC, 50/60 Hz) plus two auxiliary switch changeover contacts mean it's ready for panel integration without ordering separate accessories for basic signaling and undervoltage protection.
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.