Thermally responsive electrical switch

摘要

A motor protector ( 10 ) is shown having an elongated generally cup-shaped metallic housing ( 12 ) formed by a top wall ( 12 a) and a side wall ( 12 b) extending down from the perimeter of the top walls, the free end of which is welded to a header ( 14 ). The side and top wall have a rounded junction ( 12 c) and a calibration rill ( 12 e) is formed in the top wall from one end of the housing and through the rounded junction. An elongated thermostatic disc ( 16 ) is mounted in the housing and has a movable electrical contact ( 20 ) mounted at one end to be movable into and out of engagement with a stationary electrical contact ( 34 ) that is in turn mounted on a heater ( 26 ). A ceramic insulator plate ( 32 ) is interposed between the heater and the header.