MCCB with shunt trip for line protection
It includes a factory-integrated shunt trip (STL) release for remote tripping, making it suitable for applications where emergency-off or supervisory control signals must open the breaker independently of the overcurrent mechanism. Breaking capacity is rated at 121 kA at 240 V, 75.6 kA at 415 V, 25 kA at 440 V, and 11.9 kA at 690 V — figures that cover most industrial distribution panels up to 690 V line-to-line. Dimensions are 105 mm wide, 158 mm high, and 70 mm deep — a standard 3-pole SENTRON 3VA frame that fits the same panel cutout and busbar spacing as other 3VA breakers in this current class. Front protection is IP40, adequate for enclosed distribution boards where the breaker face is behind a door.
Above that, derating applies: 243.3 A at 55 °C, 236.5 A at 60 °C, 229 A at 65 °C, and 223 A at 70 °C.
Integrated shunt trip and subcomponents
The shunt trip release (STL) is designed as an auxiliary release — part number 3VA9688-0BL32 is the integrated trip unit. The supplied basic switch is 3VA12254EF320AA0. The trip indicator is also absent, so visual status is limited to the handle position.