What this MCCB is and where it lands
The Siemens 3VA1110-4EF36-0AG0 is a SENTRON molded case circuit breaker (MCCB) rated for 100 A continuous current across a 3-pole configuration. It's built for line protection — meaning the primary job is feeder and distribution protection in a panel, not motor-starting duty. The TM240 thermal-magnetic trip unit handles overloads and short circuits with a fixed thermal curve and magnetic pickup; there's no electronic adjustability, so what you see on the nameplate is what you get for coordination studies.
Breaking capacity — the real-world fault handling
This MCCB carries a breaking capacity of 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at 690 V. For a 100 A frame, those figures are high — it will interrupt a major fault without cascading upstream, which is what you want when the transformer is close and the available fault current is stiff. The 690 V rating is notably lower, but that's typical for a 3-pole breaker on a line-to-line 690 V system; if your panel is 400 V class, the 75.6 kA number is the one that governs your SCCR compliance.
Thermal derating — don't assume 100 A at 70 °C ambient
The 100 A rating holds from 40 °C through 50 °C ambient. At 55 °C it's 96 A, at 60 °C it's 94 A, at 65 °C it's 92 A, and at 70 °C it's 90 A. If this breaker sits in a hot enclosure — say next to a drive or above a transformer — factor that continuous-current reduction into your load schedule. The trip unit itself is thermal-magnetic, so the thermal element is ambient-sensitive; the derating curve is the manufacturer's own data, not a rule-of-thumb.
Panel fit and auxiliary contacts
Footprint is 76.2 mm wide, 130 mm tall, 70 mm deep — a standard 3-pole MCCB width that fits most DIN-rail or screw-mount panel layouts. The front face carries IP40 protection, so it's fine inside a closed cabinet but not for washdown zones. It ships with one auxiliary switch and one trip alarm switch (HP type), which gives you a status signal for the PLC or annunciator without adding a separate accessory block. No undervoltage release, no shunt trip, no communication module — this is a clean, no-frills line-protection breaker.