A device that uses lights to monitor the working or position status of circuits and electrical equipment. The indicator light is usually used to reflect the working state of the circuit (powered or unpowered), the working state of the electrical equipment (running, out of service or test) and the position state (closed or disconnected), etc.
The indicator light using incandescent lamp as the light source is composed of lamp cap, bulb, lampshade and connecting wire, etc. There are also light-emitting diodes as indicator light, which are generally installed on the panel, panel, table, and cabinet of high and low voltage power distribution devices. On the panel of some low-voltage electrical equipment, instruments or other conspicuous locations. The indicator light that reflects the working status of the equipment, usually a red light is on to indicate that it is in operation, a green light is on to indicate that it is out of service, and a milky white light is on to indicate that it is in a test state; the indicator that reflects the status of the equipment is usually lit to indicate that the equipment is live, and the light is on. Off means that the device is de-energized; the indicator light that reflects the working status of the circuit, usually a red light on means live, and a green light on means no electricity. In order to avoid misjudgment, check the condition of the bulb or light-emitting diode frequently or regularly during operation.
The rated working voltage of the indicator light is 220, 110, 48, 36, 24, 12, 6, 3 V and so on. Limited by the current through the control circuit, and in order to extend the service life of the bulb, it is often adopted to add a current-limiting resistor in front of the bulb or use two bulbs in series to reduce the operating voltage.
