What this breaker is and what its ratings mean
The Siemens 3VA1110-5MH36-0CH0 is a 3-pole IEC frame 160 molded case circuit breaker (MCCB) with a breaking capacity class M rating of Icu=55kA at 415V AC. That 55kA interrupting rating means it can safely clear a fault current up to 55,000 amperes at 415V without welding its contacts or rupturing the arc chamber — critical for high-fault installations like transformer secondaries or large motor control centers where upstream coordination demands a high-rupturing-capacity device. The thermal-magnetic trip unit is a TM120M set at In=100A, configured for starter protection (AM characteristic) — meaning the thermal element is sized for motor inrush without nuisance tripping, while the magnetic short-circuit pickup Ii is adjustable from 5 to 15 times In (500A to 1500A). Note the description explicitly states "without overload protection" — this breaker provides short-circuit protection only; the overload function is handled upstream by a separate overload relay or motor starter. The undervoltage release (UVR) is wound for 120-127V AC 50/60Hz and will trip the breaker if control voltage drops below its dropout threshold, a standard safety feature for conveyors or pumps that must not auto-restart after a power loss.
Integration notes
This breaker mounts on a DIN rail or can be screw-fixed to a backplate in a standard IEC enclosure. The clamp terminals accept copper or aluminum conductors — strip length and torque spec follow the manufacturer's mounting instructions. The auxiliary switches (2 HQ) and trip alarm switch (1 HQ) are factory-integrated, so no add-on accessory block is needed for remote status indication. The UVR coil draws its control power from the 120-127V AC supply; if your panel uses a different control voltage (e.g., 24V DC or 230V AC), this specific UVR variant will not operate — you would need a different order code with the matching undervoltage release coil.