What the 100 A and interrupting ratings mean for your panel
The Siemens 3VA1110-4EF32-0DH0 is a 3-pole SENTRON molded case circuit breaker rated for 100 A continuous current (Iu) across the 40 °C to 50 °C band — it holds that full 100 A without derating up to 50 °C ambient, then tapers to 90 A at 70 °C. That thermal curve means you can size the breaker for a 100 A feeder in a ventilated enclosure and still have headroom if the ambient climbs to 50 °C. The interrupting ratings are the real story here: 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at 690 V. At 415 V, that 75.6 kA puts it squarely in the high-fault tier for a 100 A frame — it holds the unit on the grid through a bolted fault without upstream coordination headaches, provided the SCCR study confirms the available fault current stays under those thresholds.
TM240 release and undervoltage trip — what drives the trip curve
This breaker ships with a TM240 thermal-magnetic overcurrent release — the thermal element handles overloads on a time-current curve, the magnetic element catches short-circuits instantaneously. The 240 designation refers to the release frame, not the continuous rating; the breaker itself is set for 100 A continuous. An undervoltage release (UVR) is integrated as standard, wired to the auxiliary trip accessory listed as 3VA9608-0BB25. That UVR will trip the breaker if the control voltage drops below a set threshold — essential for motor feeder circuits where loss of control power must drop the load. The auxiliary contact complement is 2 auxiliary switches plus 1 trip alarm switch (HQ version), giving you both status feedback and a separate alarm signal for the trip event. No communication function, no phase-failure detection, no ground-fault monitoring — this is a straight line-protection breaker, not a multifunction power monitor.
Panel fit — dimensions and mounting
The breaker measures 130 mm high, 76.2 mm wide (3-pole width — standard 3-module DIN footprint), and 70 mm deep. That 70 mm depth is the body depth behind the panel face; it fits a standard 200 mm deep enclosure with room for wiring gutters. The front face carries IP40 protection — suitable for a clean indoor panel, not a washdown environment. Mounting is via the standard SENTRON screw-clamp terminals; the breaker snaps onto a DIN rail or can be screw-mounted to a backplate. The 76.2 mm width matches the 3VA1110 frame across the 3VA family, so a panel laid out for a 3VA1112-5EF32-0CA0 (which is a 125 A frame, different release) shares the same mounting footprint — the 3VA1110-4EF32-0DH0 drops into the same DIN slots without rewiring the bus bars, provided the continuous current and interrupting ratings match the application.