What this MCCB is and what it does
The Siemens SENTRON 3VA2025-8HN36-0AA0 is a 3-pole molded case circuit breaker (MCCB) rated for 25 A continuous current, designed for line protection in distribution panels and industrial feeder circuits. It carries an ETU350 electronic trip unit, which provides adjustable overload and short-circuit protection curves — a step up from fixed thermal-magnetic trip units for selectivity coordination.
Breaking capacity and where it matters
Rated breaking capacity reaches 440 kA at 240 V, 330 kA at 415 V and 440 V, 220 kA at 500 V, and 52.5 kA at 690 V — these figures tell you the maximum fault current the breaker can safely interrupt at each voltage level, critical for SCCR compliance at the panel level. The 25 A rating holds flat across the full ambient temperature range from -25 °C to 70 °C, so no derating is needed in a warm enclosure.
Mounting and panel fit
Dimensions are 105 mm wide, 181 mm high, and 86 mm deep — standard MCCB footprint for a 3-pole SENTRON frame, fitting common panel cutouts and busbar arrangements. Front face carries IP40 protection, suitable for general indoor panel installation where tools are required to access live parts.