What this MCCB is and what it does
The Siemens 3VA1110-6EF32-0JH0 is a SENTRON molded case circuit breaker (MCCB) rated for 100 A continuous current across a 3-pole configuration, designed for line protection in distribution panels. Its TM240 thermal-magnetic overcurrent release provides fixed thermal and magnetic trip settings, so the breaker clears overloads and short-circuits without needing an external relay — a standard fit for feeder circuits where adjustable trip curves aren't required. The interrupting ratings span 220 kA at 240 V, 154 kA at 415 V, 121 kA at 440 V, and 17 kA at 690 V, which means this MCCB can handle high-fault-current scenarios typical of industrial transformer secondaries or large motor control centers without cascading upstream.
Thermal derating and ambient conditions
The breaker carries its full 100 A rating from 40 °C through 50 °C ambient, then derates to 96 A at 55 °C, 94 A at 60 °C, 92 A at 65 °C, and 90 A at 70 °C — a thermal curve that matters when the MCCB is enclosed in a non-ventilated panel near other heat sources. Operating range is -25 °C to 70 °C; storage range extends from -40 °C to 80 °C, so the part tolerates cold warehouses and hot enclosures alike. Front-face protection is IP40, meaning tools or fingers won't contact live parts from the front, but the breaker is not sealed against water ingress — mount it inside a panel with a door.
Auxiliary and trip accessories
This variant ships with a shunt trip (STL) auxiliary release for remote tripping via a control signal, plus a pre-installed auxiliary contact block carrying 2 auxiliary switches and 1 trip alarm switch (HQ configuration) — enough for status feedback to a PLC or alarm annunciator without adding a separate module. A voltage trigger is built in, and a mechanical trip indicator confirms the breaker has opened on fault — useful for quick visual checks during troubleshooting. The integrated auxiliary trip order code is 3VA9688-0BL32, which is the factory-fitted accessory; if that unit fails, order the same code for a drop-in replacement.
Lifecycle and sourcing posture
No undervoltage release, no phase-failure detection, no ground-fault monitoring, and no communication function are fitted on this variant — if those features are required for your BOM, a different 3VA order code in the same physical footprint should be selected.
Mechanical fit and panel integration
Dimensions are 130 mm height, 76.2 mm width, and 70 mm depth — the width matches the standard 3-pole MCCB footprint for Siemens 3VA frames, so it occupies the same DIN-rail or mounting-plate space as other 3VA 100 A units. Latching endurance is rated at 15 000 operations, which covers frequent switching in panel feeder duties but is not intended for motor-starting cycles.