Siemens 3VA1125-5EF32-0HH0 — 25 A SENTRON MCCB with 187 kA Interrupting Capacity
The Siemens 3VA1125-5EF32-0HH0 is a SENTRON molded case circuit breaker (MCCB) designed for line protection. It is a 3-pole unit rated at 25 A, with a maximum interrupting capacity of 187 kA at 240 V AC — the figure that governs its fault-clearing capability at common distribution voltages. At 415 V it interrupts 121 kA, at 440 V it handles 75.6 kA, and at 500 V and 690 V it is rated for 17 kA each.
Thermal Derating and Panel Fit
The breaker holds its full 25 A rating from 40 °C through 50 °C ambient. Above that it derates: 24 A at 55 °C and 60 °C, 23 A at 65 °C and 70 °C. The 8.5 W maximum power loss matters for enclosure thermal budgeting — in a sealed panel with multiple breakers, that heat adds up. Dimensions are 70 mm deep, 76.2 mm wide, and 130 mm tall, fitting standard SENTRON 3VA panel footprints.