Why the traditional gear motor protection device protection effect is not ideal?

The traditional PC gear reducer protection device to fuse, thermal relay-based. Fuse is the use of the earliest and most simple gear motor protection device. In fact, the fuse is mainly used for short-circuit fault, the protection of power lines, reducing the scope of the expansion of the fault. That the fuse can protect the motor short circuit or overload, do not press the motor starting current selection fuse, but by the rated current to choose, is not scientific. Do not you know that this is more likely to cause the gear motor to be disconnected due to phase failure.
Thermal relay is the most widely used large industrial gearbox overload protection device. But the thermal relay function is single, low sensitivity, error, poor stability, has been recognized for the majority of electrical workers, all of these defects caused by gear motor protection is not reliable. This is precisely the case; although many devices installed thermal relay, but the damage to the motor and affect the normal production of the phenomenon is still widespread.
Therefore, users of the variable gear motor in the choice of protection, should take full account of the actual situation of the motor when the gear, select the most suitable for use of the motor protection gear. With the change of the times, the traditional gear motor protection technology is also innovative, more and more perfect performance, including the upgrading of traditional technology in the gear motor protection, functionality and adaptability and service life has become perfect, But relative to the price. These gear motor protection are available for users to choose!