The Siemens 3VA1225-5GF42-0AA0-ZD00 is a 4-pole IEC frame 250 molded case circuit breaker from the 3VA1 series, rated for line protection with a TM240 ATAM trip unit. Its headline breaking capacity is 55 kA at 415 V (class M), meaning it can safely interrupt fault currents up to that level without upstream cascading — critical for selective coordination in a distribution panel. The thermal-magnetic trip offers adjustable overload protection from 175 A to 250 A and fixed short-circuit pickup at 5 to 10 times the rated current In=250 A. N-conductor protection is set at 100%.
This breaker mounts in a standard panel or enclosure on a DIN rail or bolted to a mounting plate, depending on the 3VA1 frame accessories. The nut keeper kit included with this variant (ZD00 suffix) is specified for DC Power OEM applications in China — the kit retains the terminal nuts during transport and vibration, a detail that matters if the breaker ships as part of a pre-wired assembly rather than as a loose component.