Siemens 3VA1110-4EF32-0AH0 — SENTRON MCCB, 100 A, Line Protection
Breaking capacity is the headline spec for this class. At 240 V AC, the 3VA1110-4EF32-0AH0 interrupts 121 kA symmetrical — that is a very high rating for a 100 A frame, suited for high-fault utility or transformer-fed service entrances. At 415 V it still clears 75.6 kA, and at 690 V it holds 11.9 kA. These figures govern the available fault current the breaker can safely open without external current-limiting fuses. Rated insulation voltage is 800 V, which covers 480/277 V and 600 V delta systems with margin. The 3-pole construction handles three-phase loads. Power loss at rated current is 25 W maximum — relevant for panel thermal budgeting when multiple breakers are ganged.
Thermal Derating and Ambient Operating Range
The 100 A rating is valid from 40 °C up to 50 °C without derating. Above that, the continuous current must be reduced: 98 A at 55 °C, 96 A at 60 °C, 94 A at 65 °C, and 91 A at 70 °C. This is a standard thermal-magnetic characteristic — the bimetal element responds to both load current and enclosure ambient. If the breaker lives in a non-ventilated panel near other heat sources, use the 60 °C or 65 °C column for sizing. Operating ambient range is -25 °C to +70 °C; storage range is -40 °C to +80 °C. The storage figure governs handling and warehousing, not running conditions.
Physical Fit and Auxiliary Switching
Dimensions are 130 mm height, 76.2 mm width, 70 mm depth. The width is a standard 3-pole MCCB footprint for DIN-rail or panel-mount installation. Depth of 70 mm (2.76 in) fits within typical distribution cabinet clearances. The breaker ships with a factory-installed auxiliary switch block: 2 auxiliary switches (form C) plus 1 trip alarm switch HQ. This provides status feedback for the open/closed position and a separate signal for trip events — useful for remote monitoring or PLC inputs. No undervoltage release or shunt trip is included on this variant; those are separate accessories. A trip indicator is present on the front face, giving a visual flag when the breaker has opened on fault versus manual switching.