What this MCCB carries and where it fits
The Siemens SENTRON 3VA1220-4EF42-0HC0 is a 4-pole molded case circuit breaker (MCCB) rated for 200 A continuous current, built for line protection in distribution panels and switchgear assemblies. Its breaking capacity is specified across four voltage levels: 121 kA at 240 V, 75.6 kA at 415 V, 25 kA at 440 V, and 11.9 kA at 690 V — giving you the SCCR headroom to coordinate with downstream devices in most industrial low-voltage networks. The TM240 thermal-magnetic overcurrent release handles the overload and short-circuit protection curves; there is no integrated ground-fault monitoring, phase-failure detection, or communication module on this variant, so it is a straight line-protection breaker for a feeder or main. It ships with 2 auxiliary switches (HQ type) pre-installed and accepts a shunt trip (STL) auxiliary release, order code 3VA9688-0BL30, for remote tripping.
Thermal derating and panel fit
The 200 A rating holds flat from 40 °C through 50 °C ambient; above that it derates in 6 A steps per 5 °C increment, reaching 176 A at 70 °C — a curve to check if the breaker sits in a hot enclosure or next to other heat sources. Dimensions are 158 mm high, 140 mm wide, and 70 mm deep. The front face carries IP40 protection, so it is suited for indoor panel mounting where tools or fingers are the main concern, not hose-down. Operating ambient range is -25 °C to 70 °C; storage range is -40 °C to 80 °C.