Line protection MCCB with TM240 release
The Siemens SENTRON 3VA1110-5EF36-0DH0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection, carrying a continuous current Iu of 100 A with a TM240 thermal-magnetic overcurrent release. The TM240 designation means the thermal element is fixed at 100 A and the magnetic short-circuit pickup is adjustable — typical for feeder and distribution panels where you need coordination downstream of a larger upstream device. The 187 kA breaking capacity at 240 V AC (121 kA at 415 V, 75.6 kA at 440 V, 17 kA at 690 V) puts this squarely in the high-interrupting category, sized for high-fault industrial networks where standard 25-65 kA breakers would fail. Rated insulation voltage is 800 V, so it's comfortable on 480/277 V and 600 V systems.
Thermal derating and panel fit
The breaker holds its full 100 A rating up to 50 °C ambient — no derating needed in a typical ventilated enclosure. Above that, it steps down: 96 A at 55 °C, 94 A at 60 °C, 92 A at 65 °C, and 90 A at 70 °C. If your panel runs hot (say, next to a drive cabinet or in a non-climate-controlled room), that 90 A at 70 °C figure is the number to design to. Dimensions are 130 mm height, 76.2 mm width, 70 mm depth — standard 3-pole MCCB footprint for DIN-rail or panel-mount installation. IP40 on the front means it's protected against tools and wires >1 mm, but not against water ingress; keep it inside the enclosure.
Auxiliary contacts and undervoltage release
Factory-fitted with 2 auxiliary switches plus 1 trip alarm switch (HQ configuration) and an undervoltage release (UVR). The UVR trips the breaker when control voltage drops — standard for emergency-stop circuits or undervoltage protection on motor feeders. The integrated auxiliary trip module is order code 3VA9608-0BB25, so if you need a spare or replacement, that's the part. Mechanical endurance is 15,000 operations, which is typical for an MCCB in distribution duty — not a switching contactor, but fine for occasional manual isolation or automatic fault clearing.