What it is and what it does
The Siemens SENTRON 3VA1110-5EF36-0CA0 is a 3-pole molded case circuit breaker (MCCB) designed for line protection — meaning it sits at the incoming feeder or main distribution point, not on a motor branch. It carries a TM240 thermal-magnetic release (fixed thermal, fixed magnetic) and includes an undervoltage release (UVR) as standard, so if your control voltage drops, the breaker trips without a separate shunt trip module. Rated 100 A continuously at 40 °C ambient, it holds that full rating up through 50 °C, then derates to 98 A at 55 °C, 96 A at 60 °C, 94 A at 65 °C, and 91 A at 70 °C — useful to know if this breaker lives in a non-climate-controlled enclosure near other heat sources. Breaking capacity is the headline: 187 kA at 240 V, 121 kA at 415 V, 75.6 kA at 440 V, and still 17 kA at 500 V and 690 V. That 187 kA at 240 V is a high-interrupting rating — this breaker can clear a bolted fault on a large transformer secondary without needing a current-limiting fuse upstream.
Panel fit and integration
Dimensions are 130 mm high, 76.2 mm wide, 70 mm deep — a standard 3-pole MCCB footprint that drops into most Siemens 3VA panelboards and distribution blocks without adapter plates. The 70 mm depth means it clears shallow backpan enclosures where deeper breakers would force a gutter extension. Rated insulation voltage is 800 V, so it's suitable for 480/277 V and 600 V systems with margin. Maximum power loss at rated load is 27.5 W — factor that into your enclosure thermal calculation if you're packing multiple breakers in a sealed box. Operating temperature range is -25 °C to +70 °C; storage range is -40 °C to +80 °C. The undervoltage release is factory-integrated, so you don't lose a pole position for an add-on accessory.
Sourcing and lifecycle
The base switch assembly part number is 3VA11105EF360AA0 — that's the naked mechanism without the UVR. If you ever need to replace just the switch body and reuse the undervoltage release, that's the reference to give your Siemens rep.