Motor-protection MCCB with flat thermal curve and high interrupting capacity
The Siemens SENTRON 3VA2125-7MN32-0AA0 is a 3-pole molded case circuit breaker (MCCB) purpose-built for motor protection, carrying a continuous current rating of 25 A that holds flat across the entire 40 °C to 70 °C ambient range — no derating needed as the panel warms up. Its adjustable trip class (Tc) lets you select 10A, 10E, or 20E to match the motor's starting profile — 10A for fast-starting pumps, 20E for high-inertia loads like centrifuges or conveyors that need a longer acceleration ramp without nuisance tripping. Phase failure detection is built in, so the breaker trips on loss of a phase — critical for preventing single-phasing damage on three-phase motor loads. The interrupting capacity is substantial: 330 kA at 240 V, 242 kA at 415/440 V, 187 kA at 500 V, and 3.7 kA at 690 V — enough headroom for most industrial distribution boards with high fault current potential.
Panel fit and integration
Dimensions are 86 mm deep, 105 mm wide, 181 mm tall — standard MCCB footprint for a 3-pole 25 A frame, fitting most DIN-rail or panel-mount enclosures without surprises. Rated insulation voltage is 800 V, and the operating temperature range spans -25 °C to 70 °C, with storage from -40 °C to 80 °C. Maximum power loss is just 0.6 W — negligible heat contribution inside a sealed panel.