What this MCCB is and what it does
The Siemens 3VA1025-4ED32-0AA0 is a SENTRON molded case circuit breaker (MCCB) designed for line protection in distribution panels. It carries a rated continuous current of 25 A across ambient temperatures from 40 °C to 50 °C, derating to 24 A at 55 °C and 60 °C, and 23 A at 65 °C and 70 °C — so you can count on full 25 A up to 50 °C before you need to account for thermal derating in a warm enclosure. The interrupting ratings are what make this part stand out: 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at both 500 V and 690 V. That high 121 kA at 240 V means it can safely clear a massive fault on a low-voltage distribution bus without the arc flashing upstream — a key spec for panel SCCR coordination.
Overcurrent release and protection design
It uses a TM210 thermal-magnetic overcurrent release — the "TM" means a fixed thermal element for overload protection and a fixed magnetic element for short-circuit protection. The "210" designates the specific trip curve family. This breaker is built for line protection, not motor or generator protection, so it's the right choice for feeder circuits, subpanels, and branch protection where you want a standard inverse-time trip. The breaker has no undervoltage release, no voltage trip, no communication function, no ground-fault monitoring, and no trip indicator — it's a straight thermal-magnetic MCCB with no accessories. If you need those add-ons, you'd look at a different variant in the 3VA family.
Dimensions and panel fit
It measures 130 mm high, 76.2 mm wide, and 70 mm deep. That 76.2 mm width (3 inches) is a standard 3-pole MCCB footprint for this current class — it will drop into a panel designed for a 3-pole SENTRON 3VA frame without needing to re-drill the mounting plate or adjust busbar spacing. Operating temperature range is -25 °C to 70 °C, storage from -40 °C to 80 °C. Maximum power loss is 8.5 W — useful to know for thermal calculations inside a sealed enclosure.
Lifecycle and sourcing reality
For DC network applications, the evidence notes that switching power values in DC networks require consulting the 3VA molded case circuit breaker device manual — the standard AC ratings don't directly apply to DC circuits.