Siemens 3VA1125-5EE42-0AA0 — SENTRON 4-Pole MCCB, 25 A, TM220 Release
The Siemens 3VA1125-5EE42-0AA0 is a SENTRON molded case circuit breaker (MCCB) in the 3VA1 platform, rated for line protection. It carries a continuous current rating of 25 A across the ambient range from 40 °C to 50 °C, then derates to 24 A at 55–60 °C and 23 A at 65–70 °C — a thermal curve worth checking if the panel runs warm. This is a 4-pole breaker with a TM220 thermal-magnetic release, meaning the fixed thermal trip and magnetic short-circuit trip are matched to the 25 A frame. The interrupting ratings are substantial: 187 kA at 240 V, 121 kA at 415 V, 75.6 kA at 440 V, and 17 kA at both 500 V and 690 V. That SCCR headroom means it can sit upstream of most branch panels without worrying about cascading faults.
Panel Fit and Footprint
Dimensions are 130 mm high, 101.6 mm wide, and 70 mm deep. The 70 mm depth fits shallow enclosures. The 4-pole width is 101.6 mm.