What this 3VA1 MCCB carries
The Siemens 3VA1225-5EF42-0AA0-ZD00 is a 4-pole molded case circuit breaker from the 3VA1 IEC frame 250 series, rated for line protection with a TM240 thermal-magnetic trip unit. Its interrupting capacity is Icu=55kA at 415V, which places it in breaking capacity class M — meaning it can safely clear fault currents up to that level on a 415V system without upstream cascading. Overload protection is adjustable from Ir=175A to 250A, and short-circuit protection is set at Ii=5 to 10 times In, giving the commissioning engineer flexibility to match the breaker's trip curve to the downstream load.
Deployment context
This MCCB is designed for panel mounting in industrial switchgear, with a 4-pole configuration that suits three-phase plus neutral applications where the neutral conductor is unprotected (N conductor unprotected). The nut keeper kit is included for secure busbar or cable connections, which is a practical detail for panel OEMs wiring high-current feeders. The DC Power OEM in China designation indicates this variant was configured for a specific OEM build — verify the termination and accessory fit against your enclosure layout before specifying.