What this MCCB is and where it fits
The Siemens 3VA2025-6KP46-0AA0 is a SENTRON molded case circuit breaker (MCCB) designed for line protection in distribution panels and switchgear. Its 25 A continuous rating and 4-pole configuration suit it for three-phase plus neutral circuits in commercial and industrial installations where you need coordinated overcurrent protection. The ETU850 electronic trip unit gives you adjustable overload and short-circuit protection curves, plus communication capability for integration into a higher-level monitoring system — useful when you want to track breaker status or fault events without a panel walk.
Breaking capacity — what the numbers mean for your fault level
This MCCB carries a rated ultimate short-circuit breaking capacity (Icu) of 242 kA at 240 V AC, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 3 kA at 690 V. At typical 400 V-class distribution voltages, 187 kA is well above what most service-entrance or sub-distribution panels will see, so you have headroom for high-fault installations like large transformer secondaries or industrial mains. The 3 kA at 690 V figure is the limiting case — if your system runs at 690 V (common in mining or marine), verify the available fault current stays under that threshold.
Panel integration notes
Dimensions are 181 mm high, 140 mm wide, and 86 mm deep. The front face carries an IP40 protection rating, meaning it is protected against tools and small wires entering the enclosure but not against water ingress — mount it inside a suitable cabinet. The 4-pole footprint matches standard MCCB mounting patterns for panel or chassis installation. Rated insulation voltage is 800 V, and the operating temperature range is -25 °C to 70 °C, with storage from -40 °C to 80 °C. Maximum power loss is 0.84 W — negligible for thermal budgeting inside a sealed enclosure.