500 



ELECTRICAL EQUIPMENT 



vessels, in each of which the circuit is broken under oil. There 

 are thus two breaks per pole, the general construction of the oil 

 vessel being apparent from Fig. 309. Each contact consists of a 



i 



FIG. 307. High-capacity Motor-operated Oil Circuit Breaker with Two 

 Tanks for Each Phase, and Phases Isolated from Each Other. 



metal rod which bears against the inner surface of four longi- 

 tudinal segments of a cylinder secured in position by helical 

 springs. This arrangement insures a heavy and uniform contact 



