Overload means that the operating current of the electrical equipment exceeds its rated or allowed current. Overload can easily cause the temperature of the line and electrical equipment to rise, damage the insulation of the electrical equipment and lines, and cause safety hazards in the operation of the equipment. Therefore, certain measures need to be taken to protect some important equipment and lines, which is called overload protection. This device is calledMotor thermal protector。

In the field of communication power supply, air switches and fuses are usually used to implement overload protection functions. Placing an air switch or a fuse in the power supply line can achieve the overload protection function. The implementation methods of these two devices are different.

Air switch typeMotor thermal protector：When the current flowing through the air switch is greater than its rated current, the air switch will automatically trip. The air switch is a reusable device and can be reused by reclosing it after tripping.

Fuse-type motor thermal protector: When the current flowing through the fuse is greater than its rated current, the fuse will disconnect. The fuse is a one-time device and cannot be used again after it is melted.

From the above twoMotor thermal protectorIt can be seen that installing an air switch is much safer than installing a fuse, but the traditional air switch is far inferior to the leakage protection on the market. Here is a very good intelligent leakage protector. Shenzhen Nandouxing's independently developed, produced and sold safe intelligent leakage protector has long passed3CCertification, the quality is beyond doubt. Secondly, the function is diversified, not only has some basic functions such as leakage protection, electric shock protection, short circuit protection, lightning protection, etc. It also has power overload protection function. When the power consumption equipment protected by the equipment is over-voltage overload, the equipment will automatically shut down, and automatically restore power supply after self-checking, which completely plays a protective role.