Legend for panel design Door of low-voltage compartment Opening for locking or unlocking the low-voltage compartment door Option: Capacitive voltage detecting system for feeder and busbar High-voltage door Inspection window for checking the switchingdevice truck Inspection window for reading the indicators Door handle Openings for switchingdevice truck operation Opening for earthing-switch operation Pressure relief duct Busbars Bushings Post insulators Block-type current transformer Opening for locking or unlocking the high-voltage door Opening for mechanical charging of circuit-breaker closing spring Option: Make-proof earthin switch Cable sealing ends Option: Voltage transformer Earthing busbar Low-voltage plug connector Vacuum interrupters