SWITCHING EQUIPMENT 



501 



pressure, and automatically compensates for any wear of the 

 surface of either the stationary contact segments or the contact rod. 

 When the arc is ruptured, whatever burning results takes place 

 on the bell mouth of the stationary contact segments or on the 



FIG. 308. High-capacity Oil Circuit Breaker with Tanks Arranged in Tandem 

 and Separated by Barriers. 



rounded end of the movable contact rods, and in no case causes 

 damage to the working contact surfaces. The contacts are self- 

 aligning and easily renewable. 



For higher-current capacities, however, additional primary 



