A Safe and Sensitive Overcurrent Protector

Abstract

A safe and sensitive over-current protector used in the field of circuit safety protection is disclosed. The protector comprises an insulating shell (8), an inductive component and a signal component. The inductive component and the signal component are placed inside the insulating shell. The signal component is further connected with an executive component. The executive component consists of a normally closed trip device. The trip device comprises a normally closed switch and an executive trigger part. The inductive component consists of a current coil (1). The signal component consists of a normally open reed switch (3). The reed switch comprises two magnetizable reeds (4) and a packaging container (5) for packaging the reeds; and end points of the reeds are parallel. The reed switch is inserted into the current coil. The reed switch is inserted through the current coil and serially connected to a circuit; therefore a magnetic field generated by the change of current flowing through the current coil switches on the reed switch, so that the circuit is safely disconnected. The over-current protector has the advantages of high load impact resistance, small size, light weight, low cost, high precision, and high response speed.

Description

technical field [0001] The invention relates to the field of safety protection devices used in circuits, in particular to a safe and sensitive overcurrent protector. Background technique [0002] When there is an overcurrent or short circuit in the circuit, measures should be taken to cut off the circuit in time, otherwise it is easy to cause the equipment in the circuit to malfunction, and even a fire safety accident will occur. In order to cut off the circuit in time, people usually use leakage protector and air switch. The air switch is a switch that uses air as the medium of arc extinguishing. On the basis of the general automatic air switch, a zero-sequence current transformer and a leakage release are added to detect the leakage, but the disadvantages of the two switches are that the arc extinguishing effect is slightly poor, and the arcing time is long Cut off the circuit in time and quickly. Generally, the execution current of the air switch is 1.7 times the rated c...

AI Technical Summary

Problems solved by technology

In order to cut off the circuit in time, people usually use leakage protector and air switch. The air switch is a switch that uses air as the medium of arc extinguishing. On the basis of the general automatic air switch, a zero-sequence current transformer and a leakage release are added to detect the leakage, but the disadvantages of the two switches are that the arc extinguishing effect is slightly poor, and the arcing time is long Cut off the circuit in time and quickly. Generally, the execution current of the air switch is 1.7 times the rated current in the case of overload, and the execution current is 10 times the rated current in the case of short circuit.

More importantly, the general air switch controls multiple branches, and the set protection current value is larger than the sum of each branch, which cannot really protect the safety of each branch, but if it is too small, it will often trip and affect normal use. , there is a contradiction between normal use and safety, and one-to-one protection cannot be realized. If the human body flows through a large current, it will be burned and electrocuted quickly, and personal harm cannot be avoided. The response time of the air switch and the leakage protector is not enough to guarantee Operator safety and electrical equipment safe de-energization

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