The Siemens SENTRON 3VA1125-4EE36-0AA0 is a 3-pole molded case circuit breaker (MCCB) rated 25 A at 40 °C, built for line protection in distribution panels. It carries a TM220 thermal-magnetic overcurrent release — a fixed thermal trip with a magnetic short-circuit pickup that's adjustable across a 5–10x In range, giving you selectivity headroom on feeder circuits without swapping trip units. Breaking capacity runs 121 kA at 240 V AC, 75.6 kA at 415 V, and 52.5 kA at 440 V — numbers that cover most industrial service-entrance and sub-distribution applications. Rated insulation voltage is 800 V, so it's comfortable on 480/277 V and 600 V systems with margin. The front face carries IP40 protection — fine for a dry indoor panel; no washdown rating here. Power loss maxes at 8.5 W, which matters for thermal coordination in a densely packed enclosure.
Dimensions & Fit
The 3VA1125-4EE36-0AA0 measures 76.2 mm wide, 130 mm tall, and 70 mm deep — a standard 3-pole MCCB footprint that drops into Siemens SENTRON panelboards and most DIN-rail adapters. No undervoltage release, no communication module, no ground-fault monitoring; it's a straight thermal-magnetic breaker for straightforward line protection.