Chassis

Use and function
Chassis trucks are mainly used in withdrawable switchgear to carry components such as circuit breakers, transformers, etc., to push them in and out, and as auxiliary operation for connecting components and busbars. The chassis trolley is connected with the internal mechanism of the circuit breaker and the middle-mounted switchgear.
The chassis trolley can meet the interlocking requirements of GB3906 for “five-proof” when it works with the internal mechanism of circuit breakers and other interlocking mechanisms of the center cabinet, with the following specific functions:        

1. The circuit breaker can be closed only when the trolley is in the test/isolation or working position, and the trolley can not be moved after the circuit breaker is closed, thus preventing the occurrence of misconnection and misclosing of isolation contacts with load.

2.The earth switch cannot be closed when the trolley is in the working position or about 10 mm away from the test/isolating position, thus preventing misconnection of the earth switch under load.

3.The trolley cannot be moved from the test/isolating position to the working position when the earth switch is closed to prevent the earth switch from closing the circuit breaker in the closed position.

4, Once the chassis trolley enters the cabinet, the trolley cannot be withdrawn from the cabinet once it leaves the test/isolation position.”            

Lock plates for chassis car configurations