Normal open type thermal switch,w/ UL,TUV, CQC , Rohs compliant Feature: Normal open,snap action, , contact close on temperature rise, automatic resetSensitive both ... .0X4.0mmOpen Temperature: 50C to 150C, in 5C increasementTolerance for open temperature: +/-5CApplication: Motor, ballast, transformer, lighting, other electrical appliance, etc ...