Classification of motor thermal protectors
The ideal motor thermal protector is not the most functional, nor the so-called most advanced, but should be the most practical. So what is practical? Practical should meet the reliable, economical, convenient and other elements, with a high performance-to-price ratio. So what is reliable? Reliable should satisfy the function above all reliable, if function of over current, break phase must be opposite all sorts of occasions, all sorts of process, all sorts of means happen over current, break phase all can reliable action.
Secondly, its own reliability (since the motor thermal protector is to protect others, especially should have high reliability) must have the adaptability to all kinds of harsh environment stability, durability. Economy: adopt advanced design, reasonable structure, professional and large-scale production, reduce product cost, bring high economic benefits to users. Convenience: installation, use, adjustment, wiring, etc. must be as simple and convenient as possible.
Motor thermal protector can be divided into normally open action and normally closed action according to the nature of action.
1. It is generally required that the motor thermal protector and the motor structure and function are installed in one body to form a thermal dynamic system. As a heater, the motor affects the heating and cooling rate of the protector. The reliability and performance of the thermal protector should be tested in the motor.
2. This standard applies to a single motor or a series of motors with a thermal protector.
3. When using the thermal protector, it is necessary to determine whether the motor thermal protector is self-replier or non-self-replier. Generally speaking, the self-replier thermal protector can be used unless the motor is accidentally restarted which may cause danger or damage to the user.
Examples of applications that require non-self-replicating motor thermal protectors are: fuel motor, waste food processor, conveyor belt, etc. Examples of applications that require self-replicating thermal protectors are refrigerators, electric washing machines, electric clothes dryers, fans, pumps, etc.