Inleakage releasing mechanism of circuit breaker

The utility model relates to an earth leakage trip mechanism of the breaker, which comprises a coil, an iron core, a main operational mechanism and a dynamic contact module, wherein the dynamic contact module is connected with the main operational mechanism. The utility model is characterized in that the device comprises a rotary arm, a fixed axis and a trip axis; the rotary arm is provided with a upside arm and a underside arm that extend to up and down; the mid part of the rotary arm is rotationally arranged on the fixed axis, wherein the upside arm is connected with the iron core and the underside arm is leaned on the trip axis; the trip axis is connected with the trip component of the main operational mechanism. The utility model adds a rotating boom between iron core and main operation system, because the dynamitic boom of the upper boom is bigger than the dynamitic boom of the lower boom, so forms an effort-saving lever system. Whenthe utility modelis in low voltage, even if the iron core tug force is a little, can also drive the main operation system to release the lock, the movement is reliable and safe.