公开(公告)号：US4866408A

公开(公告)日：1989-09-12

申请号：US264122

申请日：1988-10-28

申请人： Jeffery J. Petraitis ,  Walfred Cardin ,  Lawrence Cooper ,  Dave Rountree ,  Leo A. Plouffe

发明人： Jeffery J. Petraitis ,  Walfred Cardin ,  Lawrence Cooper ,  Dave Rountree ,  Leo A. Plouffe

IPC分类号： H01H9/00 ,  H01H37/00 ,  H01H37/28 ,  H01H37/54

CPC分类号： H01H37/5418 ,  H01H37/004 ,  H01H37/28 ,  H01H9/0072

摘要： A three phase hermetic protector for electrical apparatus has a pair of terminals extending through a header with first and second elongated heaters mounted on the terminals and extending away from the header. A rigid support is attached to the header between the terminals and extends away from the header and mounts a third elongated heater extending back toward the header. A snap acting disc is cantilever mounted on the free end of the third heater and mounts thereon a pair of movable contacts adapted to move into and out of the engagement with stationary contacts mounted at the free ends of the first and second heaters. The rigid support mounts a calibration screw beneath the free end of each of the first and second heaters to independently adjust the vertical position of the stationary contacts.