Can be a passive CAM or a spring-loaded device with two or more camming pieces on a stem.
可以是被动凸轮保护器，也可以是有两个或更多凸轮装置的弹簧保护装置。
2
For vacuum circuit breaker with spring operating mechanism, an optimum design of CAM mechanism is significant to make the output force characteristics match the load characteristics.
D is CAM wheel pole driving, spring automatic restore structure, tight structure, reasonable design, stable driving, dust discharge and dependable air lock.