What this MCCB is and what the ratings mean
The Siemens SENTRON 3VA2025-6JQ32-0AA0 is a 3-pole molded case circuit breaker (MCCB) rated for 25 A continuous current across the full 40 °C to 70 °C ambient range — no derating needed up to 70 °C, which simplifies panel layout in warm enclosures. The ETU560 electronic trip unit gives adjustable N-conductor protection (OFF, 40 % to 160 %) and supports communication functions for integration into a monitored distribution system. Breaking capacity is the headline: 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. That 242 kA figure at 240 V means it can safely interrupt very high fault currents typical near large transformers or in high-capacity industrial feeds — not every MCCB in this frame size carries that kind of interrupting rating. The 690 V rating at 3 kA is lower but still covers most 690 V motor circuits in European-style installations. Rated insulation voltage is 800 V, and operating voltage goes to 690 V AC. The front face carries IP40 protection — fine for a clean indoor panel, but not for washdown or outdoor exposure. Dimensions are 181 mm high, 105 mm wide, 86 mm deep — standard SENTRON 3VA footprint for a 3-pole frame, so it drops into existing panel cutouts and busbar systems without surprises.
Integration and compliance notes
Mounts on a DIN rail or direct panel-mount in the standard SENTRON 3VA footprint. The 86 mm depth leaves room for wiring behind the breaker in a 200 mm deep enclosure. Spring-cage or screw terminals accept copper conductors sized for 25 A — typical for feeder or branch protection in a 400 V distribution board. Compliance documentation: as a current-production Siemens SENTRON MCCB, it ships with CE marking, UL/CSA recognition per the 3VA series listing, and RoHS/REACH declarations. The ETU560 electronic trip unit is field-configurable for N-conductor protection settings, which is useful for 3-phase 4-wire systems where neutral protection must be coordinated.