An electric overcurrent protection device

Abstract

The invention discloses an overcurrent protection device for electric power, comprising a protection box and a conductive rod. Two wiring slots are opened on the outer box wall of the protection box, and the bottom of the protection box is rotatably connected with a conductive rod through a bearing. A cylindrical block is coaxially welded on the conductive column, a sliding rail is provided on the annular surface of the cylindrical block, a moving groove is provided on one inner wall of the protection box, and both ends of the conductive rod They are respectively slidably connected with the slide rail and the moving groove, and a first spring is fixedly connected to the lower end surface of the conductive rod. The advantages are: in the present invention, the piezoelectric ceramic plates in the moving groove are set to different thicknesses, and the sliding heights of the conductive rods are different according to the overload current and the short-circuit current, so that the pressing force of the conductive rods on the piezoelectric ceramic plates is different, and the generated current is Different sizes make the buzzer size of the alarm to distinguish overload or short circuit, which is convenient for users to repair in time.

Description

technical field [0001] The invention relates to the technical field related to electric power, in particular to an overcurrent protection device for electric power. Background technique [0002] Overcurrent refers to the amount of current passing through a conductor in excess of what is expected, resulting in excessive heating, and the risk of fire or damage. Possible causes of overcurrent include short circuits, excessive loads, improper design or ground faults, usually using fuses , circuit breakers, temperature sensors and current limiters to control the risk of overcurrent. [0003] In the use of household electrical appliances, the main causes of overcurrent may be overload current and short-circuit current. In the prior art, fuses are generally used to make the circuit break by the fusing of the fuse at an ultra-high temperature when the short-circuit current occurs. Open, or the leakage protector breaks the circuit in time to protect the electrical appliances. Howeve...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the protection device in the prior art cannot distinguish whether it is overload protection or short circuit protection. When the leakage protector is disconnected by the overload current, it does not have the function of disconnection and reconnection after the electrical appliance is cut off and the load value is reduced. A kind of overcurrent protection device for electric power is proposed due to the problem that the user opens it by himself

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