As we all know, motor thermal protector (or called temperature switch, temperature controller, temperature control switch) is divided into the current type of bimetal sheet over current and the temperature type of bimetal sheet but current. The motor thermal protector is generally small in size and airtight. In addition, due to the large resistance value of the bimetal sheet, the thermal effect of the current will be generated when the current passes, so the action temperature of the current type motor thermal protector (temperature switch) is greatly affected by the current. When selecting the operating temperature of the thermal protector, the influence of the current factor must be considered.

First, when the current reaches 40% of the nominal current of the motor thermal protector, the effect of current heat on the thermal protector is significant. In a closed environment, the operating temperature of the motor thermal protector (temperature switch) should be set at 5℃ more; If the environment is open, the operating temperature of the motor thermal protector (temperature switch) should be set at an additional 8℃.

Second, when the action temperature of the thermal motor protection is lower than 70℃, the thermal effect of the current will also have a significant impact on the action of the thermal protector.

For the temperature type motor thermal protector (temperature switch), because the current does not pass through the bimetal sheet, the thermal effect of the current has little influence on the action of the thermal protector (temperature switch). But the high current thermal protector (more than 10A), if the overload capacity is not the required lead, will also cause the thermal protector (temperature switch) in advance action.

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