The Siemens SENTRON 3VA1110-4EF32-0CC0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection duty. It carries 100 A continuously at 40 °C and delivers a 121 kA breaking capacity at 240 VAC — enough to handle high-fault utility feeds or transformer secondaries without cascading upstream. The insulation voltage is rated at 800 V, so it's comfortable on 480 V or 600 V class systems. This breaker includes an integrated undervoltage release (UVR) and provisions for two HQ auxiliary switches, making it ready for safety circuits that need to drop the load on loss of control power. The trip indicator is absent — you'd rely on the auxiliary switch feedback or handle position for status.
Rated current holds flat at 100 A from 40 °C up to 50 °C — useful if the panel runs warm but not hot. Above that it derates gradually: 98 A at 55 °C, 96 A at 60 °C, 94 A at 65 °C, and 91 A at 70 °C. That thermal curve is well-documented, so you can size the breaker without guesswork if the ambient in your enclosure pushes past 40 °C.
Mechanical footprint is 76.2 mm wide, 130 mm tall, 70 mm deep — a standard 3-pole MCCB envelope that fits most DIN-rail or panel-mount enclosures without re-drilling. The maximum power loss at rated load is 27.5 W, so account for that in your enclosure thermal calculation if you're stacking several breakers in a sealed box. Storage range spans -40 °C to 80 °C, and operating ambient goes from -25 °C to 70 °C — the storage limit is about handling, not running. The breaker is line-protection designed (no communication module, no ground-fault monitoring), so it's a straightforward thermal-magnetic or electronic-trip MCCB for feeder or branch protection.