MCCB with thermal-magnetic release and shunt trip
The Siemens 3VA1220-4EF42-0HH0 is a SENTRON molded case circuit breaker (MCCB) rated for line protection in a 4-pole configuration. Its TM240 thermal-magnetic release provides overload and short-circuit protection up to 200 A continuous current at 40 °C, with a thermal derating curve that drops to 176 A at 70 °C ambient — per the datasheet, the full thermal profile is 200 A at 40/45/50 °C, 194 A at 55 °C, 188 A at 60 °C, 182 A at 65 °C, and 176 A at 70 °C. The interrupting capacity reaches 121 kA at 240 V, 75.6 kA at 415 V, 25 kA at 440 V, and 11.9 kA at 690 V, giving the site electrical engineer clear selectivity headroom for fault coordination downstream.
Integrated shunt trip and auxiliary switch complement
This MCCB ships with a factory-integrated shunt trip release (STL) for remote tripping, plus 2 auxiliary switches and 1 trip alarm switch (HQ configuration). The auxiliary contact version is specified as 2 auxiliary switches + 1 trip alarm switch HQ. The shunt trip release design is per the 3VA9688-0BL30 accessory. No undervoltage release, no communication module, and no ground-fault monitoring are included — the panel OEM wireman should plan for separate GFCI or communication add-ons if the application requires them. The IP40 front protection suits enclosed panel mounting, not washdown environments.
Mounting dimensions and panel fit
The 3VA1220-4EF42-0HH0 measures 70 mm depth, 140 mm width, and 158 mm height. The 4-pole width of 140 mm is standard for this frame size; the panel OEM wireman should verify DIN-rail or screw-mount compatibility with the existing enclosure fill factor. The 70 mm depth leaves clearance for rear-access wiring in typical 200 mm deep enclosures.