The Siemens 3VA1225-6GF42-0AA0-ZD00 is a 4-pole IEC frame 250 molded-case circuit breaker with a 70 kA interrupting capacity at 415 V (breaking capacity class H). It's configured for line protection with a TM240 thermal-magnetic trip unit, rated In=250 A, with overload protection adjustable Ir=175 A...250 A and short-circuit protection Ii=5...10 x In. The N conductor is protected at 100%.
What the Ratings Mean
The 70 kA Icu at 415 V means this breaker can safely interrupt a fault current up to 70,000 A without welding contacts or rupturing the case — critical for high-fault-capacity industrial panels where upstream transformers can deliver that kind of energy. The TM240 thermal-magnetic trip gives a fixed thermal curve for overloads (Ir adjustable from 175 to 250 A) and a magnetic instantaneous trip set at 5 to 10 times In (1250 to 2500 A). That's a standard motor-starting or feeder-protection profile; the 5-10x range covers most induction-motor inrush without nuisance tripping.