These are thermal protectors for overload protection of hermetically sealed refrigeration Compressors and such like motors. In these protectors snap action bimetal disc is actuated with the heating caused in proportion to the current drawn by the compressor. When compressor is drawing excessive current the protector is heated faster and switches off the current supply to the compressor. Trip temperature varies from 100 to 150 Deg C and reset temperature varies from 50 to 100 Deg C. These overload protctors (OLP) are also supplied with PTC relay.
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