What this MCCB is and what it handles
The Siemens SENTRON 3VA2225-7KP42-0AA0 is a 4-pole molded case circuit breaker (MCCB) rated for 250 A continuous current, designed for line protection in distribution panels and switchgear assemblies. Its ETU850 electronic trip unit gives adjustable overload and short-circuit protection curves, with a rated insulation voltage of 800 V and a maximum breaking capacity of 330 kA at 240 V. Breaking capacity drops across higher voltages — 242 kA at 415 V and 440 V, 187 kA at 500 V, and 4.5 kA at 690 V — so verify the available fault current at your system voltage before specifying.
Current derating and thermal limits
The breaker holds its full 250 A rating from 40 °C through 50 °C ambient; above that it derates linearly to 238 A at 55 °C, 225 A at 60 °C, 213 A at 65 °C, and 200 A at 70 °C. Maximum power loss is 48 W. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C.
Panel fit and mounting
Dimensions are 181 mm high, 140 mm wide, and 86 mm deep — a standard MCCB footprint for 250 A class, 4-pole units. Front-face protection rating is IP40. The breaker includes communication functionality and an other measurement function, but no undervoltage release, ground-fault monitoring, or trip indicator on this variant.