Line protection MCCB with undervoltage release
The Siemens SENTRON 3VA1110-3EF32-0BH0 is a 3-pole molded case circuit breaker rated for line protection, carrying a continuous current of 100 A at 40 °C and an insulation voltage of 800 V. Breaking capacity steps from 75.6 kA at 240 V down to 10.5 kA at 690 V — that covers most industrial distribution panels where fault levels vary by tap point. That means the breaker can be wired into a safety chain that drops the load on loss of control voltage, and the alarm contact gives a remote trip indication — useful for a panel where you need to know a branch tripped without walking the floor.
The 100 A rating holds flat up to 50 °C ambient; above that it derates gradually — 96 A at 55 °C, 94 A at 60 °C, 92 A at 65 °C, 90 A at 70 °C.
The breaker measures 130 mm high, 76.2 mm wide, 70 mm deep — a standard SENTRON 3VA footprint. The 3-pole form factor means it occupies three module widths on the rail.