What this 3VA1 MCCB carries
The Siemens 3VA1112-5MH32-0BC0 is a 3-pole IEC molded-case circuit breaker on the 160 A frame, rated 125 A continuous with a TM120M thermal-magnetic trip unit. Breaking capacity hits 55 kA at 415 V AC — class M on the 3VA1 scale, meaning it handles high fault currents typical of industrial distribution downstream of a transformer. This variant is configured for starter protection (motor branch circuit) with adjustable short-circuit pickup Ii = 5...15 × In. It ships without overload protection — the TM120M provides the magnetic-only function, so a separate overload relay handles the thermal curve for the motor. The nut keeper kit keeps the terminal hardware captive during panel wiring.
Integrated accessories
Factory-fitted with an undervoltage release (UVR) coil rated 24 V DC and two HQ auxiliary switches. The UVR trips the breaker when control voltage drops, standard for emergency-stop chains or undervoltage protection schemes. The aux switches report breaker position back to the PLC or status panel — one for open/closed, the second for trip signal if needed.