The Siemens SENTRON 3VA1110-4EF36-0HC0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection, carrying 100 A continuously at 40 °C and derating to 91 A at 70 °C — that's the full thermal curve, so if your panel runs hot near the top of the enclosure, you need to size up or account for the drop. Breaking capacity is the headline number here: 121 kA at 240 V, 75.6 kA at 415 V, and 52.5 kA at 440 V. That's serious fault-current headroom for a 100 A frame — it'll clear a bolted fault on a large transformer secondary or a high-capacity bus without the arc flash getting ahead of you. It ships with a shunt trip (STL) for remote opening and two form-C auxiliary switches (HQ) for status feedback to a PLC or annunciator. No undervoltage release or ground-fault module on this variant — those are separate order-code options if your spec calls for them.
Sizing and thermal reality
The 100 A rating holds flat from 40 °C through 50 °C — that's the sweet spot for most indoor switchgear. At 55 °C it drops to 98 A, at 60 °C to 96 A, at 65 °C to 94 A, and at 70 °C to 91 A. If your panel is in a hot mezzanine or near a furnace line, use the 70 °C figure for your load calculation. Rated insulation voltage is 800 V. Operating temperature range is -25 °C to 70 °C; storage from -40 °C to 80 °C. Max power loss is 25 W.
Panel fit
Footprint is 76.2 mm wide by 130 mm tall by 70 mm deep — a standard 3-pole MCCB envelope that drops into most DIN-rail or panel-mount SENTRON bases without re-drilling. The 25 W dissipation is low enough that side-by-side mounting at 40 °C ambient is fine; above that, follow the derating curve.