The Siemens 3VA2612-5HN32-0CE0 is a 3-pole IEC frame 1250 molded case circuit breaker with a breaking capacity class M, delivering an Icu of 55 kA at 415 V AC. The rated continuous current In is 1250 A, with overload protection Ir adjustable from 500 A to 1250 A, and short-circuit protection Isd settable from 1.5 to 10 times Ir. Instantaneous pickup Ii is fixed at 10 x In. This breaker also includes an undervoltage release rated for 120–127 V AC, 50/60 Hz, mounted as an accessory inside the 3VA2 frame.
The ETU350 LSI trip unit gives you selectivity downstream: the short-time delay (Isd) lets you coordinate with downstream breakers so only the faulted branch opens, keeping the rest of the plant online. The 1250 A frame covers large feeders — think main incomers for a motor control center or a big transformer secondary. The undervoltage release trips the breaker when line voltage drops below 120–127 V AC, protecting sensitive loads from brownout conditions.