What this MCCB carries and where it fits
The Siemens SENTRON 3VA2225-5HN42-0CA0 is a 4-pole molded case circuit breaker (MCCB) rated for 250 A continuous current, designed for line protection in distribution panels and switchboards. Its 187 kA interrupting capacity at 240 V AC — derating to 121 kA at 415/440 V, 75.6 kA at 500 V, and 4.5 kA at 690 V — gives it the headroom to clear high-fault currents upstream of branch feeders without cascading failure. The breaker carries an undervoltage release (UVR) as the auxiliary release, which drops the trip mechanism when control voltage falls below the dropout threshold, a standard requirement for safety circuits that must de-energize on loss of control power.
Thermal derating and panel integration
The 250 A rating holds at ambient temperatures up to 50 °C; above that it derates linearly to 213 A at 70 °C. In a sealed enclosure or high-ambient switchroom, that derating curve determines whether the breaker can carry the design load without nuisance tripping. The 86 mm depth, 140 mm width, and 181 mm height place it in the standard SENTRON 3VA2 footprint — it bolts directly onto the mounting plate or busbar adapter used across the 3VA2 family, so a panel kitted for a sibling variant accepts this unit without drilling or rework.