NEW MULTICONTACT RELAY 



HID 



form of open wire multiple strapping has been developed for use with 

 this terminal arrangement. It consists of bare wires held together in 

 ladder form by means of phenolic plastic blocks molded successively in 

 a continuous process. Fig. 10 shows relaj^s with ladder type horizontal 

 strapping soldered to the single wire terminals. The usual cable with 

 new solderless wrapped connections is used on the twin wire terminals. 

 Fig. 10 also illustrates the accessibility of multiple connections provided 

 by locating them off to one side in the clear area between cable groups. 



Contacts 



All contacts in the new wire spring relays are palladium having a 

 volume of contact material suitable for forty years life. This is equivalent 

 to about 200 million operations for relays in high usage circuits. Con- 

 tacts are easily visible, readily cleaned and may be insulated for test 

 purposes. 



Contacts may be replaced in the field if necessary using Bell System 

 field welding equipment." Suitable tools and electrodes have been de- 

 veloped to permit use of this equipment on all wire spring relays. 



Assembly and Adjustment 



The relay pile-up is securely fastened by two high tensile screws and 

 a spring compliance member. Laboratory tests show that a pile-up of 



COIL 



CORE 



CORE PLATE 



Fig. 7 — Core legs are held in alignment by the core plate, which is forced on 

 the ends after the coil is assembled. 



