What do the different colors of the indicator light mean?

Indicator Lamp or Indicator Light is widely used in the ship, machine tools, machine equipment, switch cabinet, power distribution cabinet. Indicator lamp also names


What Do The Different Colors Of The Indicator Light Mean? pilot lamp, who to indicate whether power is on or an equipment device is for showing the operating condition of some system.

The light information function of the indicator light

  1. Attract the operator’s attention, or instruct the operator to perform a certain operation;
  2. To reflect that a certain instruction, certain state, a certain condition, or a certain type of evolution is being executed or has been executed;


The color of the indicator light and its meaning

Color Meaning Explanation Typical application
Red Abnormal situation or alarm Alarm for possible danger and need to deal with immediately The temperature exceeds the specified (or safety) limit, and the important part of the equipment has been cut off by the protective appliance
Yellow Caveat State changes or variables approaching limit values The temperature deviates from the normal value and the overload is allowed for a certain time
Green Preparation and safety Safe operating condition indication or machinery is ready to start Cooling system operation
Blue Special instructions Any function not included in red, yellow, and green The selector switch is in the specified position
White General signal Any function not included in red, yellow, and green, such as a certain action is normal
Different Colors
Different Colors


Extended learning: How to choose the color of the electrical push button switch?


How to remove the indicator light

There is a threaded button behind the indicator light, and a gasket is screwed on the threaded button.

If the indicator light needs to be disassembled, it is usually necessary to cut off the power and then check the electricity. After ensuring that the power is off, press the lamp cover with one hand and turn the gasket on the screw with the other hand to remove it. If one person cannot complete it, two people can cooperate to complete it. Finally,  safety first, to prevent electric shock.

How to solve the poor brightness of the power distribution cabinet indicator

1. The line is not fully connected

The power cord connected to the indicator light is not connected properly, resulting in unstable voltage and causing the indicator light to not be bright. The solution is: use a multimeter to measure whether the voltage of the indicator light is normal. If it is not normal, check whether the line has poor contact and whether there is grounding.


2. Insufficient voltage

The main reason is that the power supply voltage is insufficient, or the voltage level of the indicator light is selected incorrectly, and the brightness of the indicator light cannot be supported. The solution is: replace the indicator light that meets the voltage level, and check whether the indicator light has a Leakage phenomenon.


3. Induced voltage

The phenomenon of induced voltage is very common in the power distribution cabinet. The longer the cable, the larger the capacitance and the distributed capacitance is everywhere, which is generally difficult to handle.


4. Indicator quality problem

Some indicator lights use resistors to step down, and it is easy to cause problems in power distribution cabinets with dense induced voltages. Therefore, it is recommended to use good quality indicator lights in high-voltage cabinets or important low-voltage power distribution cabinets.

Our official website is www.indicatorlight.com

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