TRAN*MISSI<>\ OF POWER HY \LTERNATINGCURRENT4OQ 



switches are in use for interrupting high-voltage circuits, but 

 the knife blades of these switches are from 4 to 6 ft. long and the 

 switch is provided with horn gaps. Such switches are suited 

 only to outside mounting, where there is ample space for the 

 inn; arc. The power rating of such switches is very limited. 

 To interrupt high-voltage circuits, especially where the power is 



Hi of individual I">lr. 

 !' !llld (In. (;,.|irr:il Kl.-.-f rir trip1r-p"lr. 1 .VOOO-Volt . 1200-amp., 



motor-opera tl. oil <-i r .-uit l.n-akrr with interlocks between the nieohnniMn. thr 

 'll doors, and th<- l: switch. 



the switch contacts nmst le iniinerscMl in oil in order to 

 quench the re.-ulting arc. \\'hen the voltage is even moderately 

 hiLdi. a separate coniparinient for each phase is necessary. The 

 switches usually have double break.-. :<(a) and (6), and 



it rated at each break ba half the total en 



The cf'tect nf the oil is to cool and (juench the arc while the cir- 

 cuit is being opened. The heat of the are tend.- to carboni/e the 



