What do the letters mean on fuses?
What do the letters mean on fuses?
The number and the A (may be mA) is the amp rating of the fuse. The L denotes that it is a low breaking capacity or glass fuse (H is High breaking capacity and is usually a ceramic package). Taking the example above a T2AL250V fuse is a 2 Amp, Time Delay glass fuse rated for 250 Volts.
How are fuses labeled?
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?
As these fuses are larger in size, there is usually a lot more information printed on the fuse body. This information that is likely to be found on the fuse is summarised in the following table….Fuse Markings.
| Marking | Fuse Element Speed |
|---|---|
| M | Medium Acting (Mitteltrage) |
| T | Slow Acting (Trage) |
| TT | Very Slow Acting (Trage Trage) |
What does the R stand for in fuses?
Class R (“R” for rejection) fuses are high performance, 1⁄10 to 600A units, 250V and 600V, having a high degree of current-limitation and a short-circuit interrupting rating of up to 300,000A (RMS symmetrical). “R” type fuseclips prevent older type Class H, ONE-TIME and RENEWABLE fuses from being installed.
How do you read a fuse code?
etc. As these fuses are larger in size, there is usually a lot more information printed on the fuse body. This information that is likely to be found on the fuse is summarised in the following table….Fuse Markings.
| Marking | Fuse Element Speed |
|---|---|
| M | Medium Acting (Mitteltrage) |
| T | Slow Acting (Trage) |
| TT | Very Slow Acting (Trage Trage) |
What does P mean on a fuse?
Standard non-time delay fuses are for receptacle and lighting circuits. For Canadian requirements, a type “P” fuse is used for non-motor loads and type “D” fuses are used for electric heating and cycling loads circuits. Both fuses have low melting-point temperature elements.
What does M mean on a fuse?
Fast Acting (Flink) M. Medium Acting (Mitteltrage) T. Slow Acting (Trage)
What does P mean on A fuse?
What do the numbers and letters mean on a fuse?
The numbers and letters in parentheses are the coding for the fuse shown in figure 2-8. Figure 2-8. – Old type military fuse designation. The old military designation always starts with “F,” which stands for fuse. Next, the set of numbers (02) indicates the style. Style means the construction and dimensions (size) of the fuse.
How do I identify a small cartridge fuse?
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). If you are unable to identify the fuse, please contact us.
What do the voltage and current ratings on a fuse mean?
In the example shown, the voltage ratings is G, which means the fuse should be used in a circuit where the voltage is 250 volts or less. After this is a set of three numbers and the letter “R,” which represent the current rating of the fuse. The “R” indicates the decimal point. In the example shown, the current rating is 1R00 or 1.00 ampere.
What are the electrical requirements for a fuse?
Following are some of the requirements. UL ampere rating tests are conducted at 100%, 135%, and 200% of rated current. The fuse must carry 100% of its ampere rating and must stabilize at a temperature that does not exceed a 75ºC rise. The fuse must open at 135% of rated current within one hour.
