MCCB with ETU350 — 25 A frame, 330 kA interrupting capacity
The Siemens 3VA2125-7HN36-0AA0 is a SENTRON molded case circuit breaker (MCCB) rated for 25 A continuous current at 40 °C, with a 3-pole configuration and an ETU350 electronic overcurrent release. Its interrupting rating reaches 330 kA at 240 V AC, dropping to 242 kA at 415 V and 440 V, and 187 kA at 500 V — numbers that tell you this breaker is built for high-fault-capacity distribution panels where selective coordination matters. The 800 V rated insulation voltage confirms it handles line-to-line voltages common in industrial feeders.
Panel fit and mounting — 105 mm wide, DIN-rail compatible
At 105 mm wide, 181 mm tall, and 86 mm deep, this breaker fits standard SENTRON panel footprints. The IP40 front protection means it is suited for enclosed distribution boards where splash and dust ingress are minimal. Mounting is via the integral DIN-rail clip — no adapter plate needed for most enclosures.
Thermal derating — flat 25 A from 40 °C to 70 °C
The continuous current rating holds at 25 A across the full operating temperature range of -25 °C to 70 °C, with no derating curve to calculate. Storage limits span -40 °C to 80 °C. Maximum power loss is 0.6 W — negligible for panel thermal budgeting.