What this breaker carries
The 3VA2025-5KP32-0DA0 is a Siemens 3VA2 IEC frame 100 MCCB with breaking capacity class M, rated Icu=55kA at 415 V AC. It is a 3-pole unit configured for line protection with an ETU850 electronic trip unit set for LSI (long-time, short-time, instantaneous) curves. The continuous current rating In is 25 A, with overload protection Ir adjustable from 10 A to 25 A, short-time pickup Isd from 0.6 to 10x In, and instantaneous pickup Ii from 1.5 to 12x In. The 55 kA Icu at 415 V means this breaker can safely interrupt fault currents up to that level without failing — critical for high-fault-capacity installations where upstream coordination demands a robust interrupting rating. The class M designation places it in the medium breaking capacity tier within the 3VA2 family, suited for industrial distribution where fault levels are significant but not extreme. An integrated undervoltage release (208-230 V AC, 50/60 Hz) is included as an accessory, allowing the breaker to trip automatically when control voltage drops below a threshold — common in emergency-stop or undervoltage protection schemes.
Deployment context
This MCCB mounts in a standard panel or enclosure on a DIN rail or bolted directly to a backplate, depending on the installation method chosen. The 3VA2 series is designed for selective coordination in industrial power distribution — the ETU850's LSI curves allow precise time-current discrimination with downstream breakers, reducing the chance of a nuisance trip taking out an entire sub-feed. The neutral conductor protection option (via external current transformer, up to 160% of In) makes this unit adaptable for 4-wire systems where ground-fault or neutral overload monitoring is required — a common need in North American and IEC installations alike.