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April 7, 1959 'A. C.QB`ERNSTEIN `2,881,365 NEUTRAL RELAY ' Filed Nov. 4, 1955 Zuj INVENTOR ALLAN C`. BERNSTE/N I BY TM ATTORNEY United States Patent "a C6 2,881,365 Patented Apr. 7, 1959 1 2 . relay of high sensitivity and magnetic e?iciency. These, and still further objects, will become apparent from 2,881,365 the following description read in conjunction with the drawings in which: . NEUTRAL RELAY Figure 1 is a perspective view, partially exploded, of Allan 'C. Bernstein, Kings Point, N.Y., assignor of one an embodiment of a relay in accordance with the inven third to Nathaniel A. Karr, Kew Gardens, and one tion; third to Philip H. Seaman, Bronxville, N.Y. Figure 2 is a side elevation of the relay shown in Fig ure 1; Application November 4, 1955, Serial No. 545,012 10 Figure 3 is a diagrammatic representation showing the 20 Claims. (Cl. 317-171) magnetic circuits of the relay shown in Figures 1 and 2, and Figure 4 is a diagrammatic representation showing the magnetic circuits of a further embodiment of a relay in This invention relates to a magnetically biased electro 15 accordance with the invention. 7 magnetic neutral relay. The neutral relay in accordance with the invention, Neutral relays have conventionally been constructed has a ?rst magnetic circuit and a second magnetic circuit. with a movable armature of magnetic material which is Permanent magnet means are positioned outside these normally spring-biased to an open position and may be magnetic circuits and form a third magnetic circuit having magnetically attracted to a closed p