The Siemens 3VA1110-5MH36-0CA0 is a 3-pole IEC molded case circuit breaker on the 3VA1 frame, rated 100 A with a 55 kA breaking capacity at 415 V AC (class M). That Icu figure means it can safely interrupt a fault current up to 55 kA without welding its contacts or rupturing the arc chamber — critical for high-fault installations like motor control centers or transformer secondaries where the available short-circuit current is substantial.
Starter protection and release configuration
This breaker is configured for starter protection with a TM120M thermal-magnetic release, adjustable magnetic trip Ii from 5 to 15 times In (500–1500 A). The TM120M curve is sized for motor starting inrush — it rides through the acceleration transient without nuisance tripping, then clears a locked-rotor or phase-to-phase fault on the magnetic element. Note the description explicitly states "without overload protection" — the thermal element is present for short-circuit backup, but overload coordination relies on a separate overload relay in the starter assembly.
Undervoltage release and wiring
An integral undervoltage release (UVR) rated 120–127 V AC 50/60 Hz is factory-fitted. The UVR trips the breaker when control voltage drops below roughly 70% of its rated value, preventing automatic reclosure after a supply dip — standard for safety circuits on conveyors, pumps, or any machine where unexpected restart could injure personnel. Clamp-type terminals accept copper conductors up to the frame's rated cross-section; no lug kit needed for standard panel wiring.