Circuit device for electric lamp of stairway lighting in building, has switch timer which is activated by voltage drop in spacer branch in which switch timer is arranged, where voltage drop is produced by switching of switching element

摘要

The circuit device (10) has switching elements (16,18,20,22) connected with an electric load (12). A switch timer (34) is activated by the voltage drop of power supply voltage in spacer branch (32) in which the switch timer is arranged. The voltage drop is produced by the switching of one of the switching element from rest position.