What this MCCB carries and where it fits
The Siemens SENTRON 3VA1110-4EF32-0HH0 is a 3-pole molded case circuit breaker rated for 100 A continuous current at 40 °C, with a TM240 thermal-magnetic overcurrent release and a built-in shunt trip (STL). It's a line-protection unit — no ground-fault monitoring, no communication module, no undervoltage release — just a straight MCCB for branch-circuit or feeder duty in a distribution panel. Breaking capacity is the headline: 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, and still 11.9 kA at 690 V. That 75.6 kA at 415 V means it handles high-fault utility feeds without cascading upstream — a real advantage in retrofit panels where the existing bus bracing is marginal. Dimensions are 70 mm deep, 76.2 mm wide, 130 mm tall — a standard 3-pole MCCB footprint that drops into a SENTRON panelboard or a DIN-rail adapter kit. Front IP40 keeps dust out of the trip-indicator window and the rotary handle; the enclosure itself is rated for panel interior, not washdown.
Thermal derating and real-world current
The 100 A rating holds flat from 40 °C through 50 °C — no derating needed in a standard 40 °C panel environment. At 55 °C it drops to 96 A, at 60 °C to 94 A, at 65 °C to 92 A, and at 70 °C to 90 A. If the breaker sits next to a heat source or in a sealed enclosure running hot, the 70 °C derated figure of 90 A is the number to use for the BOM.
Auxiliary contacts and trip signaling
Comes with 2 auxiliary switches plus 1 trip-alarm switch (HQ version). That's enough for a remote status LED, a PLC digital input for fault annunciation, and a spare contact for a shunt-trip interlock. The integrated auxiliary trip is order code 3VA9688-0BL30 — a factory-fit accessory, not field-addable without pulling the breaker.