r Difference between air switch and short circuit protector. I. Different definitions Air switch: Air switch, also known as air circuit breaker, is a kind of circuit breaker. It is a switch that automatically opens whenever the current in the circuit exceeds the rated current. Short-circuit protector: It is also called leakage circuit breaker. It is mainly used to protect the equipment from leakage failure and to protect the person from fatal electric shock. It has the functions of overload and short circuit protection. It can be used to protect the line or motor from overload and short circuit. It can also be used for infrequent switching and starting of the line under normal circumstances. II. Different Functions 1. Under normal conditions, the armature of the overcurrent release is released. In case of serious overload or short circuit fault, the coil connected in series with the main circuit will produce strong electromagnetic attraction to attract the armature downward and open the lock hook, so that the main contact is disconnected. 2. The leakage protection relay is composed of a zero-sequence transformer, a release and an auxiliary contact for output signals. It can be used as the general protection of the low voltage power network or the leakage, grounding or insulation monitoring protection of the trunk line in cooperation with the automatic switch of large current. III. Different Principles 1. When the circuit is generally overloaded, the overload current can not make the electromagnetic release act, but can make the thermal element produce a certain amount of heat, which makes the bimetallic strip bend upward when heated, pushes the lever to disengage the hook from the lock catch, and disconnects the main contact to cut off the power supply. 2. When the circuit has a short circuit or a serious overload current, the short circuit current exceeds the instantaneous trip setting current value, the electromagnetic release generates a large enough suction force to attract the armature and impact the lever, so that the hook rotates upward around the rotating shaft seat and disengages from the lock catch, and the lock catch disconnects the three main contacts under the action of the reaction spring to cut off the power supply. 3. Short-circuit protector: The reed electrode of the reed relay is connected to the “trip coil” TQ circuit. The trip coil is a coil of electromagnet, and the attraction generated by the current is enough to release the hook mentioned above, so that the DZ is immediately disconnected. Because the DZ is strung on the live wire of the user’s main wire, the electricity is cut off when the buckle is removed, and the person who gets an electric shock is saved. 1. The leakage protector can be classified according to its protection function, structural characteristics, installation mode, operation mode, number of poles and lines, action sensitivity, etc. Here, it is mainly described according to its protection function and use. Generally, it can be divided into three types: leakage protection relay, leakage protection switch and leakage protection socket.
Difference between air switch and short circuit protector
