What this MCCB delivers — and where the ratings matter
The Siemens SENTRON 3VA2125-6HL32-0AA0 is a 3-pole molded case circuit breaker rated for 25 A continuous current, with an ETU320 electronic trip unit designed for line protection. The headline number here is the breaking capacity: 242 kA at 240 V AC, dropping to 187 kA at 415 V and 440 V, then 121 kA at 500 V, and 3.7 kA at 690 V. That means this breaker can safely interrupt fault currents up to those levels without welding contacts or cascading failure upstream — critical for high-fault panels near large transformers or motor control centers. The 25 A rating holds flat across the full ambient range from 40 °C to 70 °C, so no derating curve to calculate in a warm enclosure. Insulation voltage is rated 800 V, giving headroom for 480 V and 600 V class systems.
Panel fit and integration
Dimensions are 105 mm wide, 181 mm tall, and 86 mm deep — a standard SENTRON 3VA frame size that fits existing Siemens MCCB mounting bases and busbar systems. The front face carries IP40 protection, meaning it's sealed against tools and wires but not washdown; suitable for indoor panel mounting. Operating range spans -25 °C to 70 °C, storage from -40 °C to 80 °C. No undervoltage release, no communication module, no ground-fault monitoring on this variant — it's a straight line-protection breaker with the ETU320 trip unit handling overload and short-circuit curves.