. The Bell System technical journal . ief intervals, to assist in setting up the talking are required to simultaneously close a large number of circuitpaths, as many as 240 in the trunk link connector. The earlier flat springtype multicoiitact relays* used for this purpose provide large blocks ofcontacts per relay and provide an economical means for common ormultiple wiring. The trend in new improved switching systems toward longer life,faster operation, lower cost and reduced maintenance, indicates a needfor faster and more rehable connector circuits. This paper describe
. The Bell System technical journal . ief intervals, to assist in setting up the talking are required to simultaneously close a large number of circuitpaths, as many as 240 in the trunk link connector. The earlier flat springtype multicoiitact relays* used for this purpose provide large blocks ofcontacts per relay and provide an economical means for common ormultiple wiring. The trend in new improved switching systems toward longer life,faster operation, lower cost and reduced maintenance, indicates a needfor faster and more rehable connector circuits. This paper describesa new multicontact relay, designed primarily for these is a wire spring relay incorporating the improved manufa(turingprocesses and many of the design features of the new general purposewire spring relay.* The basic unit. Fig. 1, for use in new equipments, is ahigh speed 30-contact pair relay, with wiring terminals arranged forhorizontal multiple connections. 1111 1112 THE BELL SYSTEM TECHNICAL JOURNAL, SEPTEMBER 1954. Fig. 1 — New 30-contact relay with contact cover detached. This development also includes two modifications of the new wirespring relay for replacement use and for additions in existing crossbarequipments. They are 60-contact pair relays, each consisting of two30-contact units attached to a common mounting bracket. They arecompletely interchangeable with existing crossbar system multicontactrelays. When a new improved relay is developed, it is almost invariablynecessary to continue in manufacture and carry in merchandise stock,small demand codes of the old relays for many years. In this case, how-ever, manufacture of the old multicontact relays will be discontinuedand all future needs will be supplied by the new product. OBJECTIVES AND REQUIREMENTS At the start of the project, all requirements from the standpoint ofoperating performance, circuit design and equipment use, were preparedin detailed form. The principal design objectives are summariz
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