The automatic connection interface circuits between the PABX and the automatic switch equipments of telephone office are presented in this paper.
lower echelon automatic switchboard
The automatic switch has light function (delay time for three minutes):The light is opened automatically while opening the door,shut off the door taillight to go out automatically.
Meanwhile the related issues of the use of spare power source automatic switch are discussed.
experimental electronic controlled automatic switch board
And take use of spiral type of four position automatic switch cutter frame system.
Types and characteristic of automatic switch with dual power supply are introduced and its application in continuous power supply area in power distribution station, mid-control room, fire fighting system and other vital load of large-scale or medium-sized concrete plant is elaborated.
Circuit breakers are often used because they are much like automatic switches. When they are blown, one need only go to the service panel and turn the switch on again. They do not need to be replaced.
