The Siemens 3VA2225-5JP32-0LL0 is a 3-pole IEC frame 250 molded case circuit breaker with breaking capacity class M rated at 55 kA at 415 V. It carries the ETU550 electronic trip unit configured for LSI protection — long-time (Ir), short-time (Isd), and instantaneous (Ii) — with a continuous current rating In of 250 A. The Ir adjustment spans 100 A to 250 A; Isd is settable from 0.6 to 10 times In, and Ii from 1.5 to 10 times In. This is the variant that includes a 24 V DC universal release accessory and provisions for up to 2 auxiliary contacts, plus a neutral conductor protection option via an external current transformer.
What the Ratings Mean for Fit
The 55 kA breaking capacity at 415 V (class M) determines the maximum fault current this breaker can safely interrupt under IEC 60947-2 — critical for verifying SCCR compliance at the panel level. The ETU550 LSI trip unit provides adjustable long-time, short-time, and instantaneous protection curves, allowing coordination with downstream devices. The 24 V DC universal release accessory enables remote tripping or undervoltage release functions, common in safety circuits and emergency-stop chains.