The Siemens 3VA1225-6FF42-0AF0 is a 4-pole IEC frame 250 molded case circuit breaker rated In=250A with a 70kA interrupting capacity at 415V (breaking capacity class H). The TM240 thermal-magnetic trip unit gives adjustable overload protection from 175A to 250A and fixed short-circuit protection set at 5 to 10 times In.
The adjustable Ir (175–250A) lets you dial in the cable or busbar ampacity without swapping the breaker — useful when the connected load isn't exactly 250A.
Deployment context
This is a panel-mount breaker for fixed or plug-in installation in distribution boards and motor control centers. The 4-pole configuration with 50% neutral protection makes it suited for three-phase systems where the neutral conductor is sized smaller than the phase conductors — common in commercial and light industrial panelboards. The nut keeper kit simplifies busbar connection during assembly.