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MotorThermal protectorControl and protection electronic components,Its working principle is to use the thermal effect of electric current to promote the mechanism of action,So that the control circuit of the AC contactor coil loses power and breaks,To cut off the circuit in series with the main circuit power supply. Mainly used for motor overload protection. Some thermal relays also have the functions of phase loss protection and current unbalance protection. Mainly used for motor overload protection, some motor thermal protectors also have the functions of phase loss protection and current unbalance protection. There are two thermal elements, which are the main parts of the motor thermal protector. They are composed of a bimetallic strip and a resistance wire wound on the bimetallic strip. The bimetallic plate is welded by two metal plates with different expansion coefficients. During normal operation, three sets of resistance wires are directly connected in series to the three-phase circuit of the motor load. The normally closed contact is connected to the contactor coil branch of the motor control circuit.

When the motor coil winding overcurrent causes overload,after a while,The heating element generates enough heat to bend the bimetallic strip,Insulation board,Push them the right distance,Guide and promote temperature compensators and levers,Connect dynamic and static contacts,The motor power supply AC contactor is released in a circuit, and the three-phase mains power is removed, which can protect the motor from burning out due to the high temperature generated by overload current. After cutting off the power supply, the motorThermal protectorIt starts to cool down, and after a period of time, the bimetallic strip returns to its initial state and returns to its original state, so the contact automatically resets under the action of the spring. This motor thermal protector can also be reset manually.,Just remove the screw to a certain position,In order to connect the rotation beyond a certain angle,in this case,Even if the bimetal plate is cooled,Cannot reset automatically,Contact and manual force must be used,That is to say,Pressing the reset button will reset the contacts. This is necessary to prevent the motor from starting again if the fault is not eliminated.

Electric MotorThermal protectorThe reasonable selection and correct use of the electrical equipment directly affect the safe operation of the electrical equipment, so the following issues should be paid attention to during the installation process

(1)Mounting the MotorThermal protectorWhen wiring, the dirt on the contact surface should be removed to avoid circuit blockage or excessive contact resistance affecting the working characteristics of the motor thermal protector.

(2)The wiring of the main circuit of the motor thermal protector should not be too thin to avoid heating of the terminal blocks and wiring wires that may affect the normal operation of the motor thermal protector.

(3)Electric MotorThermal protectorWhen installed with other electrical appliances, it should be installed below the output of other electrical appliances to prevent the heat from other electrical appliances from affecting other operating characteristics.