Motor protector particularly useful with hermetic electromotive compressors

摘要

A protector ( 1 ) has a metal header ( 30 ) that mounts a first terminal ( 31 ) and a second terminal ( 32 ) electrically isolated from one another. A metallic housing ( 10 ) is fixed to the header ( 30 ) and forms a chamber. A stationary contact ( 40 ) is electrically connected to the first terminal ( 31 ), a heater ( 50 ) is electrically connected between the second terminal ( 32 ) and the header ( 30 ), and an arm assembly ( 60 ) is arranged inside the chamber, with an end thereof being fixed to the housing. The arm assembly ( 60 ) includes an electrically conductive movable plate ( 70 ) having a movable contact ( 77 ) engageable with the stationary contact ( 40 ), a thermally responsive member ( 80 ) arranged at a position where it lies over or under the movable plate ( 70 ) and an electrically conductive weld slug ( 90 ) that fixes the movable plate ( 70 ) and the thermally responsive member ( 80 ) to the housing ( 10 ).