The Siemens SENTRON 3VA1180-4EF36-0KH0 is a 3-pole molded case circuit breaker (MCCB) rated 80 A at 40 °C, designed for line protection in distribution panels and industrial switchboards. It carries a breaking capacity of 121 kA at 240 V AC, with the curve stepping down to 75.6 kA at 415 V and 52.5 kA at 440 V — sufficient selectivity headroom for most secondary distribution applications.
Current ratings and thermal derating
The 80 A rating holds flat from 40 °C through 50 °C. Above that, it derates to 78 A at 55 °C, 77 A at 60 °C, 75 A at 65 °C, and 74 A at 70 °C. For a panel that runs warm — say, a packed enclosure near the upper ambient — the 70 °C figure is the one that governs the continuous load you can actually hang on this breaker.
Breaking capacity by voltage
The 121 kA at 240 V is the headline number, but the real-world fit depends on the system voltage. At 415 V it still delivers 75.6 kA; at 440 V it drops to 52.5 kA; at 500 V and 690 V it holds at 11.9 kA. For a 480 V distribution panel, the 52.5 kA at 440 V is the closest published point — sufficient for most commercial and light industrial services, but worth confirming against the available fault current at the point of installation.
Physical fit and panel integration
The breaker measures 130 mm high, 76.2 mm wide, and 70 mm deep. The 3-pole width of 76.2 mm (3 inches) is the standard MCCB footprint for a 3-pole frame at this rating — it drops into a panel that was laid out for a similar SENTRON 3VA frame without re-drilling the mounting plate. The depth of 70 mm (2.76 in) leaves clearance behind the panel door for the handle mechanism and the shunt trip (STL) auxiliary release that comes fitted on this variant.