<p>A protector ( 10 ) particularly useful for wye-connected three phase electrical motors has a header ( 12 ) mounting first and second terminal pins ( 14 ) to which L-shaped pin heaters ( 16 ) are mounted along with stationary electrical contacts ( 16 b). A generally U-shaped heater and support member ( 18 ) has two leg ends welded to the header intermediate to the terminal pins and a snap acting thermostatic disc ( 20 a) is welded through a weld slug to the central portion of the heater and support member. First and second movable electrical contacts ( 20 b) are mounted on the bottom surface of the thermostatic disc positioned to move into and out of engagement with respective stationary contacts upon snapping of the thermostatic disc from one dished configuration to an opposite dished configuration in dependence on temperature of the disc. A cover ( 24 ) is hermetically attached to the header and is provided with a force application location aligned with the weld slug which can be depressed against the weld slug and thereby adjust the operating temperature of the thermostatic disc.</p>
