Why Can The Operating Mechanism Of An Sf6 Circuit Breaker That Has Not Had Its Sealed Container Opened (for External Maintenance Only) Not Be Replaced?

When the sealing system remains intact, the internal gas environment remains unaffected. SF6 gas possesses excellent insulation and arc-extinguishing properties; the fact that the sealed container remains unopened indicates that the gas purity, pressure, and humidity levels are still within acceptable ranges. The mechanical transmission components of sf6 circuit breaker operating mechanism are isolated from the gas chamber, and external maintenance will not affect the operating status within the sealed cavity.

Mechanical wear primarily occurs in the external drivetrain. Components such as the connecting rods, bearings, and dampers of sf6 circuit breaker spring mechanism are located outside the sealed container; these parts can be lubricated, adjusted, or replaced individually through routine maintenance. As long as the transmission accuracy meets the technical specifications, the entire mechanism does not require replacement.