What this 3VA1 breaker carries
The Siemens 3VA1112-5MH32-0DC0 is a 3-pole IEC frame 160 molded case circuit breaker with a 125 A rating and a 55 kA breaking capacity at 415 V AC (class M). It is configured for starter protection using a TM120M thermal-magnetic trip unit, with short-circuit pickup adjustable from 5 to 15 times In. This variant ships without overload protection — the TM120M provides the magnetic-only short-circuit function — and includes an undervoltage release (UVR) rated 208-230 V AC 50/60 Hz, plus two HQ auxiliary switches and a nut keeper kit.
Deployment context
Snap-on mounting for panel integration. The UVR trips the breaker when supply voltage drops below the dropout threshold — used in motor control centers where a loss-of-voltage condition must disconnect the starter to prevent automatic restart. The two HQ auxiliary switches provide status feedback to a PLC or indicating lamp circuit.