Arcing is a gas discharge phenomenon that is harmful to electrical appliances. In electrical appliances with contacts, the process of making and breaking the current at the contact is often accompanied by the generation and extinguishing of an electric arc.
The four common arc extinguishing methods include mechanical arc extinguishing, magnetic blowing arc extinguishing, electronic arc extinguishing, and dielectric barrier arc extinguishing.
Among them, mechanical arc extinguishing is to rapidly elongate the arc through the limit device, which is mostly used in switching appliances
Magnetic arc extinguishing is caused by the magnetic field generated by the magnetic blowing coil connected in series with the contact, and the arc is elongated by the action of electromagnetic force and blown into a solid medium.
Electron arc extinguishing is the use of high-energy electrons to hit gas molecules, which ionize the gas molecules and form plasma, thereby quickly extinguishing the arc.
The medium blocking arc extinguishing is to use the high-temperature gas generated during the arc combustion as the medium to block the combustion of the arc during the arc combustion process, so as to achieve rapid arc extinguishing.
In addition, the arc-extinguishing electrical safety protection device is also a common arc-extinguishing method, which does not require any auxiliary power supply of the two-wire all-solid-state structure and subtle internal disconnection of the current-limiting short-circuit protection, to achieve when the short circuit, overload, grounding fault current exceeds the limit, the device quickly cuts off the power supply in the way of arc extinguishing and sends out an early alarm, to ensure that the short circuit or overload fault point does not occur dangerous sparks, to prevent the fire caused by the fault.