What it is and what it does
The Siemens 3VA1110-5MH36-0BH0 is a 3-pole IEC frame 160 molded case circuit breaker (MCCB) from the 3VA1 series, rated 100 A with a breaking capacity Icu of 55 kA at 415 V AC — class M interrupting rating for high-fault industrial distribution. It ships with a TM120M thermal-magnetic trip unit set for starter protection (motor branch circuit), adjustable short-circuit release Ii = 5–15 × In, but without overload protection (the TM120M AM variant provides magnetic-only protection for short-circuit backup). The integrated undervoltage release (UVR) coil operates at 24 V DC, and the breaker carries 2 auxiliary switches HQ plus 1 trip alarm switch HQ — all wired via clamp-type terminals.
Deployment context and integration
This MCCB mounts in a standard IEC distribution panel or motor control center (MCC) bucket, occupying a 3-pole footprint on the DIN rail or bolted busbar assembly. The clamp terminals accept copper or aluminium conductors up to the frame's rated cross-section. The UVR coil automatically trips the breaker when control voltage drops below dropout threshold — typical for emergency-stop circuits or undervoltage protection on motor feeders. The two auxiliary switches provide status feedback to a PLC or indication lamp; the trip alarm switch signals a fault condition independently.