What this MCCB carries and where it fits
The Siemens 3VA2025-8JP36-0AA0 is a SENTRON molded case circuit breaker rated for 25 A continuous current on a 3-pole line-protection design. The ETU550 electronic trip unit gives you adjustable overload and short-circuit protection curves, which means you can coordinate selectivity downstream without swapping trip packs. Interrupting capacity hits 440 kA at 240 V and still holds 330 kA at 415 V — enough headroom for most distribution panels fed by a transformer of moderate impedance. Rated insulation voltage is 800 V, so it sits comfortably in 480 V or 600 V class switchgear. The front face carries IP40 protection — fine for a clean indoor panel, but keep it out of washdown zones. Dimensions are 86 mm deep by 105 mm wide by 181 mm tall, which is the standard 3VA2 frame footprint; it mounts on a DIN rail or can be screw-fixed to a backplate. Communication function is built in, so it can talk to a higher-level controller or energy management system without an add-on module.
What the interrupting ratings mean for panel coordination
The 440 kA at 240 V and 330 kA at 415 V are the maximum fault currents this MCCB can safely interrupt. For a 480 V panel, the 220 kA at 500 V rating is the one that governs SCCR compliance. If your available fault current at the line side is under that number, this breaker can be the main or a feeder device without cascading failure upstream. The 52.5 kA at 690 V rating covers the rare 600 V class installation.
Panel integration and wiring
Mounts on a standard DIN rail or screws to a backplate. The 3-pole design means you land three phase conductors plus the neutral lug if your system requires it. Terminal sizes accept copper or aluminum conductors up to the rated cross-section for 25 A — no special lug kit needed for this frame size. The ETU550 trip unit is powered from the line side, so no auxiliary control power is required for the protection function.