Siemens SENTRON 3VA1220-5GF42-0JC0 — 200 A Molded Case Circuit Breaker, Line Protection
The Siemens SENTRON 3VA1220-5GF42-0JC0 is a 4-pole molded case circuit breaker (MCCB) rated 200 A continuous, designed for line protection in commercial and industrial power distribution. Its interrupting capacity is specified per the voltage applied: 187 kA at 240 V AC, 121 kA at 415 V AC, 75.6 kA at 440 V AC, 30 kA at 500 V AC, and 17 kA at 690 V AC — these figures govern the maximum fault current the breaker can safely clear at each system voltage without upstream coordination failure.
Current Derating and Thermal Limits
The breaker carries its full 200 A rating from 40 °C through 50 °C ambient. Above that, the thermal-magnetic or electronic trip unit must be derated: 194 A at 55 °C, 188 A at 60 °C, 182 A at 65 °C, and 176 A at 70 °C. For panel builders, this means the 3VA1220-5GF42-0JC0 can be installed in a 50 °C enclosure without downsizing the main conductors, but above that temperature the load current must be reduced per the published curve. Operating ambient range is -25 °C to +70 °C; storage range is -40 °C to +80 °C.
Physical Fit and Auxiliary Components
Dimensions are 158 mm high, 140 mm wide, and 70 mm deep — a 4-pole frame that occupies roughly 5.5 inches of DIN-rail or panel-mount width. The breaker ships with a shunt trip release (STL) for remote tripping and two auxiliary switches (HQ type) for status feedback to a PLC or annunciator panel. Rated insulation voltage is 800 V, which covers 480/277 V and 600 V systems with margin. Maximum power loss at rated load is 42 W, a figure to consider for enclosure thermal calculations.