Thermal derating and ambient temperature
The 3VA1125-5EF32-0BH0: The breaker holds its full 25 A rating up to 50 °C ambient. Above that, it derates linearly: 24 A at 55 °C, 23.5 A at 60 °C, 23 A at 65 °C, and 22.5 A at 70 °C. If your panel runs hot — near a drive or transformer — factor that curve into the load schedule; the 25 A nameplate applies only below 50 °C.
Integrated undervoltage release and auxiliary contacts
This variant includes an undervoltage release (UVR) as the auxiliary release design, plus a 2 auxiliary switch + 1 trip alarm switch HQ contact block. The UVR trips the breaker when control voltage drops below a threshold — standard for safety circuits where loss of control power must open the main contacts. The auxiliary contacts feed status back to a PLC or annunciator panel without a separate interposing relay.
Panel fit and dimensions
The 3VA1125-5EF32-0BH0 measures 130 mm high, 76.2 mm wide, and 70 mm deep — a 3-pole footprint that fits standard SENTRON mounting plates and DIN-rail adapters. IP40 on the front face means it is protected against tools and wires >1 mm, suitable for enclosed distribution boards; no washdown rating, so keep it inside the cabinet.