The Siemens SENTRON 3VA1125-3EF32-0DH0 is a 3-pole molded case circuit breaker (MCCB) rated 25 A at 40 °C, with a breaking capacity of 75.6 kA at 240 V.
The 25 A rating holds steady from 40 °C up to 50 °C, then derates to 24 A at 55–60 °C and 23 A at 65–70 °C — so if your panel ambient runs hot, you lose 1–2 A of headroom. Breaking capacity drops from 75.6 kA at 240 V to 52.5 kA at 415 V, then to 32 kA at 440 V, and further to 11.9 kA at 500 V and 690 V. The insulation voltage is rated 800 V, so the breaker is physically capable of 690 V line-to-line service — the 11.9 kA at 690 V is the limiting factor, not the insulation.
Built-in accessories and deployment
The UVR means the breaker drops out when control voltage is lost — typical for emergency-stop or safety circuits where a loss of signal should kill power. The trip indicator (mechanical flag) gives a clear visual when it's tripped, which speeds fault isolation on a panel walk-through.