What this MCCB delivers
The Siemens SENTRON 3VA2125-6HK42-0AA0 is a 4-pole molded case circuit breaker rated for 25 A continuous current, fitted with an ETU340 electronic trip unit. That interrupting capacity — 242 kA at 240 V, 187 kA at 415/440 V, 121 kA at 500 V, and 3.7 kA at 690 V — means it handles high-fault scenarios on the secondary side of a distribution transformer without cascading upstream. The ETU340 gives you adjustable long-time, short-time, and instantaneous pickup settings, so you can coordinate selectively with downstream feeders.
Panel fit and integration
Footprint is 140 mm wide by 181 mm tall by 86 mm deep — standard for a 4-pole SENTRON 3VA frame that size. Front protection is IP40, so it's fine inside a clean enclosure but not for washdown areas. The 25 A rating holds flat across the full ambient range from 40 °C to 70 °C, which simplifies derating calculations in a warm panel.