What this MCCB is and what it carries
The Siemens SENTRON 3VA1110-5EE32-0KH0 is a 3-pole molded case circuit breaker (MCCB) rated for 100 A continuous current (Iu) with a TM220 thermal-magnetic release — meaning it uses a bimetal element for overload protection and a solenoid for short-circuit response, no electronics to fail or drift. The 187 kA breaking capacity at 240 V AC drops to 121 kA at 415 V, 75.6 kA at 440 V, and 17 kA at 690 V; that 240 V figure is the headline for North American 277/480 V wye panels where the line-to-neutral fault current can be high. Rated insulation voltage is 800 V, so it comfortably covers 480 V and 600 V class systems. The thermal derating curve is published: full 100 A up to 50 °C ambient, then 96 A at 55 °C, 94 A at 60 °C, 92 A at 65 °C, and 90 A at 70 °C. If this breaker sits in a non-ventilated enclosure near other heat sources, that 70 °C figure is the realistic continuous limit — plan the load accordingly.
Footprint and panel integration
The 3VA1110-5EE32-0KH0 measures 130 mm high, 76.2 mm wide, and 70 mm deep. That 76.2 mm width is a standard 3-pole MCCB footprint — it occupies three 25.4 mm (1-inch) module positions on a DIN rail or panel-mount base. The IP40 front protection means it resists tools and wires larger than 1 mm from entering the front face, but it is not sealed against washdown; keep it inside a rated enclosure.
Auxiliary and trip accessories
This variant ships with 2 auxiliary switches plus 1 trip alarm switch (HQ type) factory-installed, and a shunt trip release (STL) for remote tripping. The integrated auxiliary trip order code is 3VA9688-0BL33. No undervoltage release, no communication module, no phase-failure detection, no ground-fault monitoring — it is a straight line-protection breaker with remote trip capability and status feedback.