The circuit breaker is a switching device that can connect, transmit and cut off the current under normal circuit conditions. It can connect, transmit and cut off the current under abnormal circuit conditions within a specified time. It can be used to distribute electrical energy, occasionally start asynchronous motors, protect power lines and motors, and are widely used. As the main functional component of the circuit breaker to realize the above functions, the tripper can realize the overload protection and short circuit protection of the circuit. The trip lever of the existing release is a lever element for over-current action and momentary action. When the delay is tripped, the tripper can close the circuit breaker switch of the delay trigger mechanism, and when the instant is tripped, the tripper can close the circuit breaker of the instant trigger mechanism. Although the existing tripping device can realize the above-mentioned tripping functions of over-current long-delay tripping and short-circuit instantaneous tripping, when the input current exceeds several times of the rated current and is lower than the short-circuit current, the existing tripping device cannot be tripled in time, which may still cause line damage.

ForOvercome the above-mentioned shortcomings of the existing technology.Point,Technical StaffProvide a trip function when the input current exceeds the rated current and is lower than the short-circuit current.release. In order to achieve the above objectives,The releaseThe following technical scheme is adopted: a release, which is installed on the circuit breaker and connected with the circuit. The release device includes a housing, a first release lever, a first transfer switch, and a first momentary trigger mechanism. The first shift lever is rotatably disposed on the housing and has a first lever body, a first rotating arm, and a first contact disposed on the first lever body. The first switch is disposed on the housing and cooperates with a trip mechanism of the circuit breaker. The first instantaneous trigger mechanism is arranged on the housing and connected in series with the loop. When the input current in the loop reaches a preset short-circuit value, the first rotating arm is instantaneously pushed to drive the first rod to rotate, so that the first contact triggers the first switch, and the tripping mechanism is tripped by the first switch. The release device also includes a second release lever, a second transfer switch, and a second momentary trigger mechanism. The second release lever may be coaxially and rotatably disposed on the housing with the first release lever and have a second lever body, a second rotating arm, and a second contact disposed on the second lever body. The second transfer switch is disposed on the housing and cooperates with the trip mechanism. The second instantaneous trigger mechanism is arranged on the housing and connected in series with the loop. When the input current in the loop reaches a preset intermediate value between the rated value and the short-circuit value, the second rotating arm is instantaneously pushed to drive the second rod body to rotate, so that the second contact triggers the second switch, and the tripping mechanism is tripped by the second switch. According to an embodiment of the present invention, the housing has a rotating shaft, the first rod body is rotatably sleeved on the rotating shaft; the first rod body has a notch, and the second rod body is rotatably sleeved on the rotating shaft and is located in the notch.

To sum up the above,AboveThe advantages and positive effects of the release are:On the basis of the existing tripping device for realizing the short-circuit instantaneous protection, the tripping device can realize the tripping function when the input current exceeds the rated current and is lower than the short-circuit current through the structural design of the second instantaneous trigger mechanism cooperating with the second tripping device rod. in addition,The releaseBy adopting the design that the second trip rod and the first trip rod rotate coaxially, there is no need to add a rotating shaft matched with the second trip rod in the housing, the structure is simple and the implementation is convenient.