The Siemens 3VA1225-4GF42-0AA0-ZD00 is a 4-pole IEC frame 250 molded case circuit breaker from the 3VA1 series, rated for line protection with a TM240 thermal-magnetic trip unit.
For a panel on a 400 V industrial supply with a transformer rating above 1 MVA, that SCCR typically clears the fault without needing a current-limiting upstream fuse. The adjustable Ir (175–250 A) lets the thermal trip match the actual load current, so an MRO planner can dial it to the exact cable or bus rating on site. The magnetic Ii range of 5–10 x In (1250–2500 A) handles motor starting currents up to about 8x FLA for a 250 A motor circuit, which covers most IEC frame 250 applications.
Deployment Context
The nut keeper kit suggests this variant is destined for a DC Power OEM in China, likely for a solar or battery energy storage system where the breaker mounts in a pre-drilled panel or enclosure. The 3VA1 frame is designed for DIN-rail or screw-mount integration in standard distribution boards.