The Siemens 3VA1110-6MH36-0AB0 is a SENTRON molded case circuit breaker (MCCB) in the starter protection version, carrying a rated continuous current Iu of 100 A across three poles. It uses a TM120M thermal-magnetic overcurrent release — no fancy electronics, just a bimetallic strip and magnetic coil that trip on overload and short-circuit. The breaking capacity at 240 V hits 220 kA, which is high enough to handle most industrial service-entrance or feeder applications without worrying about cascading upstream. Out here in the grease, where motors start and stop all day, the 100 A rating at 40 °C stays flat through 50 °C — only drops to 98 A at 55 °C and 91 A at 70 °C. That thermal derating curve means you can run this breaker near a hot motor starter enclosure without losing headroom. The 800 V rated insulation voltage Ui covers 480 V and 600 V class systems easily.
Breaking capacity across voltages
This breaker's interrupting rating drops off as voltage climbs: 220 kA at 240 V, 154 kA at 415 V, 121 kA at 440 V, and 8.5 kA at 690 V. The 8.5 kA figure at 690 V is the one to watch if you're on a 600 V class system — it's still adequate for most motor branch circuits, but you want to check the available fault current at the panel.
Integration and mounting
The breaker measures 130 mm high, 76.2 mm wide, and 70 mm deep. That 70 mm depth means it fits standard panel-mount cutouts and leaves room for busbar connections behind the door. The front face carries IP40 protection — fine for a clean indoor panel, but keep it out of washdown zones. Two HP auxiliary switches are built in for status feedback to the PLC or alarm circuit.
Starter protection duty
This is the starter protection version, which means the TM120M release is tuned for motor starting profiles — it handles the inrush without nuisance tripping but still clears a locked-rotor fault. The 15 000 latching endurance cycles tell you it's built for frequent operation, not just a backup feeder breaker. No undervoltage release, no ground-fault monitoring, no communication module — it's a straight-up thermal-magnetic MCCB for motor branch circuits.