What it is and what it does
The Siemens 3VA1110-6MH36-0BH0 is a 3-pole IEC frame 160 molded-case circuit breaker rated for 100 A continuous current, with a high breaking capacity of 70 kA at 415 V AC (class H). That rating means it can safely interrupt a fault current up to 70,000 amps without welding contacts or rupturing the case — critical for installations with high available fault current, such as industrial switchboards or motor control centers fed by large transformers.
Starter protection and trip unit
This breaker is configured for starter protection with a TM120M thermal-magnetic trip unit. The thermal element provides overload protection for motor circuits; the magnetic element provides short-circuit protection with an adjustable instantaneous trip setting (Ii) from 5 to 15 times In (500 A to 1500 A). Note that the listing states 'without overload protection' — this means the TM120M is set for magnetic-only (short-circuit) operation, relying on an external overload relay for motor thermal protection. The adjustable Ii range lets you tune the magnetic pickup to coordinate with downstream contactors and cable impedances.
Auxiliaries and undervoltage release
Two HQ auxiliary switches and one HQ trip alarm switch are factory-installed, giving you status feedback for the breaker position and trip event. The undervoltage release (UVR) is 24 V DC — when control voltage drops below the dropout threshold, the UVR trips the breaker open. This is standard for emergency-stop circuits or undervoltage protection schemes where a loss of control power must disconnect the load. Clamp-type terminals accept copper conductors without lugging, which speeds panel wiring.