The Siemens 3VA1225-4EF42-0JA0 is an IEC frame 250 molded-case circuit breaker in the 3VA1 series, class S breaking capacity, rated for 36 kA at 415 V AC. It is a 4-pole unit with line protection TM240 and ATAM, set for a nominal current In=250 A, with adjustable overload protection Ir from 175 A to 250 A and short-circuit protection Ii adjustable 5 to 10 times In. This breaker includes a shunt trip (STL) for 110-127 V DC or AC 50/60 Hz, a nut keeper kit, and leaves the N conductor unprotected.
The 36 kA Icu at 415 V gives solid headroom for most industrial panel fault levels — class S breakers are typically used in main or large feeder applications where the available fault current is high. The TM240 thermal-magnetic trip unit provides standard cable and equipment protection, and the adjustable Ir and Ii ranges let you coordinate with downstream devices without swapping the breaker.