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( 46504 of 46504 ) |
United States Patent | 3,555,362 |
Quinn | January 12, 1971 |
Apparatus for connecting a three-phase source of energy to a load only when a signal is present in each phase comprising a connector having a control relay for connecting the source with the load in respond to current flow through the relay. Switch means is provided which is responsive to the failure of a signal in any one phase for disconnecting the control relay from a source of current. The apparatus further includes overload protection means and a device for preventing reverse DC current flow through the ground lead in a four-wire system.
Inventors: | Quinn; Frederic R. (Red Hook, NY) |
Assignee: |
Zyrotron Industries, Inc.
(South Hackensack,
NJ)
|
Appl. No.: | 04/768,489 |
Filed: | October 17, 1968 |
Current U.S. Class: | 361/102 ; 307/117 |
Current International Class: | H02H 3/08 (20060101); H02H 3/24 (20060101); H02H 3/253 (20060101); H02h 003/24 (); H02h 003/08 () |
Field of Search: | 317/46,13,41,13.2,31,18,13.3,17 307/117,125 |
3225280 | December 1965 | Happe et al. |
3243658 | March 1966 | Blackburn |
3404313 | October 1968 | Happel et al. |
3428865 | February 1969 | Opad |
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