What this MCCB is and where it fits
The Siemens SENTRON 3VA2025-8JQ46-0AA0 is a 4-pole molded case circuit breaker rated for 25 A continuous current, designed for line protection in industrial distribution panels. Its interrupting capacity hits 440 kA at 240 V AC and still carries 330 kA at 415 V AC, so it handles high-fault scenarios without cascading upstream. The 86 mm depth and 140 mm width mean it fits standard DIN-rail or panel-mount footprints common in motor control centers and switchgear.
Key ratings and what they mean for the buyer
Continuous current is 25 A at ambient temperatures from 40 °C all the way up to 70 °C — no derating needed in a hot panel. The adjustable overload trip range goes from 38 A minimum to 300 A maximum, so this breaker can be dialed in for motor or feeder protection. Rated insulation voltage is 800 V, giving headroom for 690 V systems. Ground-fault monitoring uses summation current on L+N, which catches leakage without a separate GFCI module. Communication function is built in, so it can talk to a PLC or BMS for remote trip indication and load shedding.
Panel integration and environment
Dimensions are 181 mm tall, 140 mm wide, 86 mm deep — fits a standard 4-pole MCCB cutout. Operating temperature range is -25 °C to 70 °C; storage goes from -40 °C to 80 °C. Maximum power loss is just 0.5 W, so heat buildup in a dense cabinet is negligible.