Automatic non-automatic reset
Current temperature type dual thermal protection
All kinds of three-phase motors, motors
Can be used to protect 1/8 horsepower-horsepower general three-phase motors, pneumatic motors, fans
Three-phase motors for commercial and industrial machinery
Compressors for air conditioners and refrigerators
Submersible pumps, well pumps and oil sump pumps
The three-phase protector is composed of a molded phenolic resin base device, which contains three heaters and a snap-type bimetallic circular plate, welded with three silver contacts, the bimetallic plate is the neutral point of the motor, and three built-in A resistance heating wire, each heating wire is connected in series with a certain phase winding of the motor, and at the same time is connected with a contact on the thermal bimetal. When the disc is quickly broken due to overheating, the center line of the motor is opened, thereby cutting off the power of the motor. Dual voltage motors can be protected by a protector, as shown in the wiring diagram. For dual-voltage motors, high voltage is used for the protector, and low voltage is used to select the size of the protector according to the contact capacity.
Operating temperature range: 90℃~150℃
Rated voltage: 380V~440V AC
Overload current trip value selection range: 3A~37A
Action time: 5s~15s
The protector should be installed inside the motor and can receive the maximum heat generated in the running state or stalled rotor state from the windings. The best installation position depends on the structure of the motor, but generally speaking, this position can be an air cover, an end cover or a stator core.