The Siemens 3VA2025-5KP42-0AA0 is a SENTRON molded case circuit breaker (MCCB) in the 3VA2 platform, designed for line protection in distribution panels. It carries a 25 A continuous rated current across the full ambient temperature range from 40 °C to 70 °C, so no derating is needed for typical panel environments. The 4-pole configuration covers three-phase plus neutral, and the ETU850 electronic trip unit provides adjustable overload and short-circuit protection curves.
Breaking capacity and fault clearing
This MCCB delivers 187 kA breaking capacity at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 3 kA at 690 V. The steep drop at 690 V reflects the physical limits of the arc-quenching chamber at higher system voltages; for 690 V applications the 3 kA rating still clears most downstream faults in a properly coordinated panel.
Trip unit and monitoring
The ETU850 electronic trip unit supports communication and other measurement functions, making it suitable for integration into energy monitoring or predictive maintenance schemes. The rated insulation voltage is 800 V, and the front face carries IP40 protection — adequate for enclosed panel mounting, not for washdown environments.
Physical fit
Dimensions are 86 mm deep, 140 mm wide, and 181 mm high. The 140 mm width is standard for a 4-pole MCCB in this frame size; verify the DIN-rail or mounting-plate spacing against the existing panel layout before specifying.