What do the markings on a fuse mean?

What do the markings on a fuse mean?

Small fuses generally identify the element speed using markings such as F, M, T etc, whilst larger fuses identify the element speed using markings such as gL, gG, aM etc. Some fuses use terms such as slow acting, fast acting, motor rated etc.

How do you read a fuse label?

The first letter(s) (TT, T, M, F, FF) tell you what type of fuse it is:

1. FF = Fast Fast. Very Quick Acting. ( also known as Anti Surge)
2. F = Fast. Quick Acting. ( also known as Anti Surge)
3. M = Medium. “Normal” or Very Short Delay.
4. T = Time. Time Delay or Slow Blow.
5. TT = Time Time. Long Time Delay or Very Slow Blow.

How are fuses labeled?

Note: Many small cartridge fuses will have additional markings stamped on the end caps. These are usually either; a series number, a part number, or product approval markings (refer table 3 below). As these fuses are larger in size, there is usually a lot more information printed on the fuse body. …

How do I identify a fuse?

Look for “Class RK1” printed on the fuse. These fuses can be recognized by their cartridge shape or blades used for slot mounting. Look for “Class RK5” printed on the fuse. These fuses can be recognized by the round body with blades where they can be bolted in place or in its cartridge version.

What does the number on a fuse mean?

Car fuses are color coded by amp rating. For example, a standard blue fuse has a 15-amp rating, yellow is 20 amps and green is 30. You can buy them at any auto parts store and at well-stocked service stations. Note: If your new fuse blows soon after installing it, you could have problems in that circuit.

What is a bad relay?

1. Car suddenly stalls while operating. One of the most common symptoms of a failed ignition relay is a car that suddenly stalls while operating. If the ignition relay shorts, burns out, or otherwise fails while the engine is operating it will cut off power to the fuel pump and ignition system.