NEW Mli;rKO\TACT KKLAV 



1117 



no appreciable penalty in ])ertonnan('e. The armature has a(le([uate 

 sections to carry tiie flux, optimum poleface area and lowest possible 

 mass. Two small rectangular holes in the armature locate the base of the 

 card in the horizontal direction only. The card is located xcitically by 

 the restoring spring as illustrat(Ml in Fig. 1. Fast i-elease is obtained by 

 a nonmagnetic separator strij), welded to the face of the armature. 

 This stri]) also provides a smooth sup]iorting surface foi- the molded 

 card. Xegligibh^ wear at this ci'itical point contributes materiall}' to 

 long life and stal)le adjustment of this relay. 



.V cellulose acetate filled coif is asseml)l(Ml to the center leg of the core. 

 A nonmagnetic core plate, illustrated in Fig. 7, is then forced over the 

 three core legs to hold them in aUgnment. The center hole in the core 

 plate also functions as an armature backstop and permits a certain 

 amount of o^•ert ravel of the armature when the relay is released. 



Coil Assemblies 



For circuit reasons, r20-ohm and 275-ohm coil resistances used in the 

 old relays are reciuired in the new relays. Nominal power savings which 

 ordinarily would i-esult due to an improved magnet and reduced load, 

 are therefore sacrificed in the new relays in fa\-or of increased speed. 

 More than half of the new relays are expected to be used in circuits 

 rec^uiring maximum speed of operation and will, therefore, have 120-ohm 



,- RESTORING SPRING 



COMMON 



STATIONARY 



CONTACT 



'""'''"TiH 



TWIN CONTACTS 

 (MAKE) 



TENSIONj ||_. 



tensionT iLfe 



ARMATURE'' 



nonmagnetic 

 " separator 



TWIN WIRES 

 ' (MAKE) 



REED HINGE 



UNOPERATED 



OPERATED 



Fig. 5 — Principal of contact operation. 



