What does 312 mean on a fuse?
“312” are Littelfuse fast fuses. Same as “AGC” fuses made by Bussmann. These are size 3AG — 0.25″ dia x 1.25″ long or 6.35mm x 31.75mm.
What is a 314 fuse?
Datasheet. The 3AB Fast-Acting Fuse with ceramic body construction. permits higher interrupting ratings and voltage ratings.
What do the letters mean on a fuse?
There are thousands of fuses that have similar dimensions, so you need to be precise when measuring the fuse. Cartridge Fuses: Measure the overall length of the fuse and the diameter of the caps. Bottle Fuses: Measure the overall length of the fuse and the diameter of both caps as the often vary in size.
Is there a part number on a fuse?
There are many different fuse manufacturers and each manufacturer can have different fuse brands. Hopefully the part number will be quite obvious on the fuse, but it can sometimes be difficult to identify or there may not be a part number on the fuse. If you can’t identify the part number, you will need to rely on other methods of identification.
How can you tell the size of a fuse?
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.
What kind of voltage does a fuse have?
The voltage rating is usually shown on the fuse and is expressed in Volts. Fuses are usually rated for either voltage AC (eg. 250VAC) or voltage DC (eg. 32VDC). A fuse should only be used in a circuit that matches its voltage specifcation ie.
What do the numbers mean on a fuse?
Next, the set of numbers (02) indicates the style. Style means the construction and dimensions (size) of the fuse. Following the style is a letter that represents the voltage rating of the fuse (G). The voltage code table in figure 2-8 shows each voltage rating letter and its meaning in volts.
What are the markings on a fuse cap?
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. Table 3. Quality & Approval Markings on the fuse cap As these fuses are larger in size, there is usually a lot more information printed on the fuse body.
What is the current rating of a fuse?
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 does the last letter on a fuse mean?
The final letter in the old military designation (A) indicates the time delay rating of the fuse. While the old military designation is still found on some fuses, the voltage and current ratings must be “translated,” since they use letters to represent numerical values.