What do the numbers on the fuses 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 does line fuse mean?
A line fuse is simply a fuse the electricity travels through on the line. If there is an overload or short circuit on the tapped line, it will blow the line fuse at the point where the tap occurs instead of tripping the substation breaker and shutting off power to everyone on the circuit.
How do you read fuse numbers?
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) |
How do you read fuse specs?
The first letter(s) (TT, T, M, F, FF) tell you what type of fuse it is:
- FF = Fast Fast. Very Quick Acting. ( also known as Anti Surge)
- F = Fast. Quick Acting. ( also known as Anti Surge)
- M = Medium. “Normal” or Very Short Delay.
- T = Time. Time Delay or Slow Blow.
- TT = Time Time. Long Time Delay or Very Slow Blow.
What do you need to know about Littelfuse fuses?
Littelfuse offers a comprehensive line of fuse blocks, fuse holders, and fuse accessories for automotive, electronic, and electrical markets. Littelfuse manufactures the broadest and most innovative selection of fuses. Provide a complete, one-piece solution for easy procurement and code compliance.
Why is the interrupting rating important in Littelfuse?
The interrupting rating is the maximum amount of energy the device can safely withstand. The fuse’s ampere rating is the amount of current that the fuse will allow through before beginning to operate. Both ratings are determined through testing. Why is the interrupting rating important?
How does the M-effect work in Littelfuse?
Littelfuse uses the “M-effect” to produce three very desirable characteristics in fuse designs: lower melting temperature, time delay, and lower voltage drop. By affixing a diffusion pill tin to the element, the melting temperature is decreased. This decrease in melting temperature reduces the fuse rating.
Can a fuse be used at any voltage?
Yes – Fuses are designed for use in circuits at any voltage as long as they don’t exceed the fuse’s maximum voltage rating. (Exception – medium-voltage fuses from 2,400 to 38,000 volts may only be used at the voltages designated on the fuse’s label) The voltage rating of a fuse is a safety rating that should never be exceeded.