What this MCCB delivers on a distribution bus
The Siemens 3VA1220-6EF42-0AH0 is a 4-pole SENTRON molded case circuit breaker designed for line protection, with a continuous current rating of 200 A at 40 °C and a thermal-magnetic TM240 release. Its headline breaking capacity hits 220 kA at 240 V, stepping down to 154 kA at 415 V, 75.6 kA at 440 V, 30 kA at 500 V, and 17 kA at 690 V — so it handles high-fault utility feeds or transformer secondaries where upstream SCCR demands serious interrupting muscle. The 800 V rated insulation voltage confirms it's built for 690 V industrial networks with margin.
Thermal derating and real-world current
Rated 200 A at 40 °C, the 3VA1220-6EF42-0AH0 holds that same 200 A through 45 °C and 50 °C. At 55 °C it derates to 194 A, then 188 A at 60 °C, 182 A at 65 °C, and 176 A at 70 °C. In a warm panel — say 55 °C ambient — you lose only 6 A, so this breaker fits tightly packed switchboards without oversizing.
Physical fit and auxiliary switching
Dimensions: 158 mm high, 140 mm wide, 70 mm deep. The 4-pole body fits standard SENTRON mounting footprints. It ships with 2 auxiliary switches plus 1 trip alarm switch HQ, giving remote status and trip indication without an add-on module. The supplied basic switch variant is 3VA12206EF420AA0, which means the internal switching mechanism is pre-configured for this order code.