Thermal Relays and Motor Protectors Cannot Be Equated

It is a well-known fact that bimetal thermal relays and motor protectors cannot be equated. According to incomplete statistics, the thermal relay can work less than 30 times every 100 times when the motor is about to burn. The reasons for this are many, mainly because of the insurmountable drawbacks of thermal relays. For example, bimetals are prone to thermal fatigue, and it is difficult to recover at first after overheating. Therefore, many electromechanical devices do not use thermal relays at the beginning of their design.

The motor protector has been on the ground in China for more than 30 years, and it still can't stop the motor from burning out. The main reasons are as follows:

1. When designing, there is no correct product function positioning. What are the necessary functions? Which are secondary? (Not as much as possible)

2. There is no ideal current sensor, and even the motor protector produced cannot meet the following requirements: Blockage of mis-operations; good interchangeability with thermal relays; watering and curing to adapt to various harsh environments, extending Its service life.

3, failed to give users the vital benefits.

More than 97 percent of low-voltage motors are destroyed due to over-current, resulting in over-current reasons such as overload (locked rotation), start-up time, phase loss, over-voltage, under-voltage, poor three-phase line contact, and so on. Over current (blocking), starting overtime, overvoltage, undervoltage, etc. cause excessive current; the overcurrent is the balanced increase of three-phase current; and the overcurrent caused by lack of phase, poor contact, voltage imbalance, etc. is one of the phase or two phase current. increase. Therefore, high-accuracy and sinusoidal current sampling is the key to the motor protector.

The destruction of an electric motor costs money to repair it. Sometimes it takes time for mechanics to take the time to dismantle the damaged electric motor from the mechanical device, which is time consuming and delays production. Once the key equipment of the plant is destroyed, the indirect damage will be greater. Increased expenses increased the processing costs of the product. The repaired motor, its performance is not as original, accelerated the depreciation of the whole machine. It is especially important to protect and maintain the electric motor from being burned when the price of copper is so high today.

A small but a few hundred more than a few thousand dollars of the motor is not commensurate with a thermal relay that does not work very reliably. It is not considered that the light consumes electricity (20 is equivalent to about 60W, 60 is equivalent to About 80W, 150 type is equivalent to about 100W), also can not provide the most close protection for the motor. In the past years when energy and resources were abundant, energy saving and resource conservation were not valued by the society. Today's situation that the government is so concerned about is quite different. Therefore, the birth of the ideal motor protector is an inevitable choice in today's society.