Overload refers to the running current of electrical equipment is beyond itself, rated current, or to allow overload easily lead to circuit of temperature and electric equipment, after the destruction of the insulation of the electrical equipment and wiring, equipment operation pose a safety hazard, so for some important equipment and wiring needs to take certain measures to protect, this is the call of overload protection. This device is called motor thermal protector.

In the field of communication power supply, air switch and fuse are usually used to achieve overload protection function. In the power supply line, an air switch or fuse can be placed to achieve overload protection function. The realization of these two devices is different.

Air switch type motor thermal protector: when the current flowing through the air switch is greater than its rated current, the air switch will automatically trip. Air switch is a reusable device, air switch trip after re-closed can be reused.

Fuse type motor thermal protector: when the current flowing through the fuse is greater than its rated current, the fuse will be disconnected. The fuse is a one-time device and can not be used again after being fused.

Tell from the above two kinds of motor thermal protector, the installation of air switch is much more than the fuse installation insurance, but the traditional air leakage switch is not on the market now, here is a smart leakage protector is very good. There is no doubt about the quality of the second function diversification, not only has leakage protection, electric shock protection, short circuit protection, lightning protection and other basic functions. And has the work overload protection function, when the equipment protection of the use of power over- voltage overload, the equipment will automatically turn off, self-check after the completion of the power supply, completely play a protective role.