What this 3VA1 is doing in your panel
The Siemens 3VA1225-5EE42-0AA0-ZD00 is a 4-pole IEC frame 250 molded case circuit breaker rated for line protection with a TM220 thermal-magnetic trip unit. Breaking capacity class M delivers 55kA Icu at 415V — that is the interrupting rating the breaker can clear once without damage, sized for high-fault industrial distribution where the available short-circuit current sits above 50kA. The thermal overload adjustment spans Ir=175A to 250A, and the magnetic short-circuit pickup is fixed at Ii=10 x In, so the instantaneous trip fires at 2500A. This variant carries an ATFM (Advanced Technology for Fault Management) designation and includes a nut keeper kit, spec'd for a DC Power OEM build in China.