Role in the circuit control circuit on and off: this is the most basic function of the power switch, by manual or automatic control switch of closing and opening, to start or stop the electrical equipment work, convenient user for electrical equipment operation and management. The circuit protection circuit and equipment: overload, short circuit fault occurs, the power switch can cut off the circuit in a timely manner, to prevent the failure to further expand, to protect electrical equipment and wiring from damage, at the same time also can avoid the circuit fault caused by accidents. Power switch in a variety of electronic equipment, electrical system, and plays an important role in daily life, is to realize the control circuit and an important element to protect the safety of electricity.
What are the common faults of the power switch? Power switch common fault has the following categories: poor contact failure performance: electrical equipment works sometimes, sometimes cannot be started, or in the case of in the process of using the intermittent power outages; Electrical sparks may be generated when the switch is switched on or off. Cause analysis: after long-term use, the switch inside the contact may be caused by wear and oxidation contact area is reduced, increased contact resistance; The wiring end is loose, so that the connection between the wire and the switch is not strong, and the phenomenon of poor contact will occur when the current passes through. Mechanical failure
Fault performance: the button cannot spring up after being pressed, or the switch feels stuck and not smooth; The switch handle is easy to break or fall off, resulting in normal operation of the switch. Cause analysis: switch the spring inside, leverage such as mechanical parts may be due to long-term use of fatigue, deformation or damage; External physical impact may cause damage to the mechanical structure of the switch, such as the switch is hit, squeezed, etc. Short circuit fault, fault performance, when connected to the power switch, blown fuse in the circuit, or leakage protector trip; You may smell burning or even see smoke at the switch. Cause analysis: switch the internal insulation aging, damage, result in different polarity wires or direct contact between contact, forming a short circuit; During installation or use, foreign objects may enter the inside of the switch, causing a short circuit. The leakage fault
Fault performance: When using electrical equipment, the human body comes into contact with the equipment shell or the switch surface,
there will be electric shock inductance; Leakage protector trips frequently. Cause analysis: the insulation of the switch performance degradation, the current through the insulation leakage to the shell or other grounding; The internal wire is broken, causing the current in the wire to leak to the outside. Unable to open or close order: no matter how to switch operation, circuit is always in the connected state, can’t cut off the power supply, or switch has been disconnected, electrical equipment cannot be electric start. Cause analysis: to mechanical switch, the lock body that may be damaged, unable to realize normal closing and opening movement; For electronic switches, there may be a failure of the control circuit, such as chip damage, driver circuit failure, etc., resulting in the switch cannot work according to the instructions. How to prevent the power switch failure? To effectively prevent the power switch failure, can be used from the correct selection and installation, daily maintenance, regular inspection measures, specific as follows: reasonable selection of correct selection and installation: according to use environment load and choosing the appropriate power switch. For example, switches with moisture-proof and water-proof functions should be used in humid environments; For high-power appliances, it is necessary to choose a switch that matches the rated current and voltage to ensure that it can safely carry the load current and avoid damage due to overload.
Standard installation: Strictly follow the installation instructions to install the switch, ensure that the installation position is correct and firm, the wiring is firm, and comply with the electrical safety regulations. When connecting cables, ensure that the wires are tightly connected to the switches to avoid virtual connections. At the same time, pay attention to distinguish the live wire, neutral wire, and ground wire to avoid faults or security risks caused by wrong connections.
