NEW MULTICONTACT RELAY 



1127 



120 OHM 275 OHM 



HIGH SPEED 



WIRE SPRING RELAY 



FLAT SPRING RELAY 



Fig. 15 — Comparison of operate and release times of wire spring versus flat 

 spring multicontact relays. 



times are shown in Fig. 15. The improved performance of the new relays 

 is shown by nominal operate and release values, and also by greatly 

 reduced spread, or difference between minimum and maximum values, 

 as compared with corresponding data for flat spring relays. 



Minimum operate times of the replacement and existing flat spring 

 relays are comparable. It will be noted however, that operate and re- 

 lease time spreads are much less in the new relay. This generally should 

 improve the operation of existing crossbar circuits as new relays are 

 used for replacements or additions. 



Contact Performance 



As speed increases, rela3^s and other switching mechanisms become 

 more susceptible to false operation of contacts. It is obvious also that 

 faster operation adds to life requirements and therefore extends the 

 period or increases the number of operations during whicli trouble-free 

 contact performance must be provided. For these reasons, extensive 

 studies were made of chatter, unprotected erosion, and locked contacts 

 as applied to the new multicontact relay. Additional longer range tests 



