What this MCCB does on the line
The Siemens 3VA1116-5FF42-0AA0 is a SENTRON molded case circuit breaker (MCCB) rated 80 A continuous, 4-pole, with a TM240 thermal-magnetic trip unit — meaning it handles both overload (thermal) and short-circuit (magnetic) protection in one package, tuned for line protection duty. Breaking capacity runs 187 kA at 240 V, 121 kA at 415 V, 75.6 kA at 440 V, and 17 kA at both 500 V and 690 V — so the available fault current at your service voltage decides whether this frame holds or you step up to a higher-rated 3VA variant. Rated insulation voltage is 800 V, and the front face carries IP40 protection — fine for a dry indoor panel, but not for washdown zones.
Thermal derating — the real current you can pull
The 80 A rating holds at 40 °C, 45 °C, and 50 °C ambient. At 55 °C it derates to 158 A, at 60 °C to 155 A, at 65 °C to 153 A, and at 70 °C to 150 A — so if your panel runs hot (say 55 °C inside the enclosure), you lose 2 A per pole, which matters for a continuous load near the limit. Maximum power loss is 38 W — that's the heat this breaker dumps into the enclosure at full rated current, so factor it into your thermal budget if the panel is tight.
Panel fit — dimensions and mounting
The 3VA1116-5FF42-0AA0 measures 130 mm high, 101.6 mm wide, and 70 mm deep — a 4-pole MCCB that fits standard DIN-rail or screw-mount panel layouts. The 101.6 mm width (4 inches) is the same as other 4-pole 3VA frames, so swapping between 80 A and 160 A versions in the same panel footprint is straightforward. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. That covers most indoor industrial environments, including unheated warehouses in winter.
What you don't get on this variant
No undervoltage release, no trip indicator, no voltage trigger, no communication function, no ground-fault monitoring — this is a bare-bones line-protection MCCB. If you need shunt trip, aux contacts, or earth-leakage, you're looking at a different 3VA order code.