Miniature "true" A-C coil relay

CONSIDERATIONS GIVEN the complex electric equipment requirements of advanced weapon systems, being developed by North American Aviation, Inc. (NAA), Los Angeles Division, and an evaluation of available relay designs concluded: The reliability and environmental limitations of presently available relay designs are not acceptable.1,2 In arriving at this conclusion, NAA evaluated new materials, fabrication procedures and techniques, and various designs and switching devices.3,4 Subsequently, a decision was made to underwrite the design, development, and manufacture of a minimum-weight minimum-volume high-performance 4-pole double-throw "true" a-c coil relay. Contrary to the skepticism exhibited and recommendations made by many of the experts in the relay industry prior to this NAA decision, no change was made in the relay design requirement: "The coil circuit shall not utilize rectifiers or other auxiliary components, and shall be capable of continuous operation."