Electrical components and symbols

Theoretically, the disconnecting switch does not have the ability to break the running current, but only serves as an obvious break point for servicing, and the QF is the ability of the circuit breaker to break the rated current. If the air switch is fixed installation is required to have a disconnecting switch supporting the use of the circuit breaker can be serviced. If the circuit breaker is removable, the removal device instead of the disconnect switch, the circuit breaker for maintenance.