The Siemens 3VM1225-5EE42-0AA0 is a 4-pole molded-case circuit breaker from the 3VM1 family, IEC frame 250, rated In=250A with a breaking capacity Icu=55kA at 415V AC (class M). Overload protection is set via the TM220 thermal-magnetic trip unit, adjustable Ir=175…250A; short-circuit pickup is fixed at Ii=10 x In. The N conductor is unprotected, and the unit ships with a nut keeper kit for panel mounting. This is a current-production part (lifecycle status active). Because it falls under product class C — manufactured or produced to order — it is not a stocked shelf item; each unit is built against a confirmed order and is non-returnable. Plan your lead time accordingly.
What the ratings mean for fit
The 55kA Icu at 415V is the maximum fault current this breaker can interrupt. The TM220 trip unit adjusts thermal overload Ir from 175 to 250 A. The fixed magnetic pickup at 10x In clears a hard short fast. The 4-pole configuration with unprotected N means the neutral pole is switched but not protected — standard for TN-S or TN-C-S systems where the neutral is bonded to earth and does not need overcurrent protection. The nut keeper kit simplifies mounting in a panel; the breaker fits standard Siemens 3VM1 accessories (busbar connectors, shunt trips, auxiliary contacts) if you need remote signaling or motor operation.