1 



1126 THE BELL SYSTEM TECHNICAL JOURNAL, SEPTEMBER 1954 



OPERATED 

 POSITION 



0.01 0.02 0.03 



ARMATURE TRAVEL f 

 IN INCHES I 



RELEASED 

 POSITION 



Fig. 14 — Typical load and pull characteristics of a 30-contact fast relay. 



the relay. The maximum ampere turns required are determined by the 

 "critical load point." This occurs at 0.010 inch armature travel and 

 about 650 grams. Under static conditions, therefore, 160 ampere turns 

 would be required for complete operation. Circuit uses for these relays 

 do not include nonoperate, hold, or release requirements. This informa- 

 tion could however be obtained from the pull curves in a similar manner . 



Operate and Release Speed 



The new high speed multicontact relay operates two to three times as 

 fast as its predecessor, the flat spring type relay. Operate and release 



