What does AL mean on a fuse?
Fuse Markings
| Marking | Fuse Breaking Capacity |
|---|---|
| H | High Breaking Capacity |
| L | Low Breaking Capacity |
What does fuse amp rating mean?
An amp or an ampere rating is the current rating for a specific fuse. The current rating of a fuse identifies the allowable current that the fuse can carry without opening under specified test conditions. Each fuse is marked with its current rating.
What is the voltage rating of a fuse?
Voltage Rating-Fuses Most low voltage power distribution fuses have 250V or 600V ratings (other ratings are 125, 300, and 480 volts). The voltage rating of a fuse must be at least equal to or greater than the circuit voltage. It can be higher but never lower. For instance, a 600V fuse can be used in a 208V circuit.
Does fuse length matter?
One common misconception about choosing the correct fuse size is that it’s dependent on the load of the circuit. Actually, the load of the circuit should have nothing to do with choosing a fuse size. The fuse size should be based on the SMALLEST wire (largest gage number) in the circuit.
What do the numbers mean on a fuse?
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. Before you buy and replace car fuses, keep in mind that the fuse panel cover often contains spare fuses and even a fuse puller.
What is an f1 fuse?
The 1F fuse has blades so you can easily secure and slot it into a fuse holder. This fuse has a current rating of 6 A and voltage rating of 550 V AC. With its high rupturing capacity, it can withstand the high pressure developed during a short-circuiting situation.
How do you choose the size of a fuse?
Always select a fuse size to protect the wire according to its rating. In some cases, a product manufacturer will specify a fuse value and it will usually be lower than that required for protecting the wire. If this fuse value is too high to protect the wire, use a bigger wire in the circuit.
What do fuse numbers mean?
What happens if I use too small a fuse?
If the rating of the fuse is too low then it will frequently blow out even for a current value which is actually safer for the circuit.
How do I choose a fuse size?
The voltage and current ratings are paramount. A fuse should be de-rated by 25% at room temperature, meaning if there is a 7.5 amp circuit, a 10 amp fuse should be used at 25˚C. Voltage ratings on a fuse can be higher than the voltage on the circuit, but not lower.
What is a Type F fuse?
They are also known as Fast Blow or F-Type fuses. Slow Acting fuses include a delay mechanism that allows short, lower power electrical surges to pass through the circuit without the fuse blowing. They are also known as Slow Blow or Time Delay fuses.
What is fuse protection?
In electronics and electrical engineering, a fuse is an electrical safety device that operates to provide overcurrent protection of an electrical circuit. Its essential component is a metal wire or strip that melts when too much current flows through it, thereby stopping or interrupting the current.
Can you replace a 15 amp fuse with a 20 amp fuse?
The answer: It’s possible, but not advisable without an electrician evaluating the situation. You should never just upgrade from a 15-amp breaker to a 20-amp one just because the current one is tripping. Otherwise, you may burn your house down via electrical fire.
Is 15 amp the same as 20 amp?
Electrical plugs designated as 20-amp will not fit into 15-amp outlets. A 15-amp circuit is usually served by 14-gauge wire and is protected by a 15-amp circuit breaker or fuse. A 20-amp circuit, protected by a 20-amp breaker or fuse, must be served by 12-gauge or 10-gauge wire.
What is a Type C fuse?
Class C fuses are not dimensionally or electrically interchangeable with other North American fuses. They feature ceramic bodies and bolt-in mounting. They are for short-circuit protection only, in motor controllers, for example, where overload protection is provided by an overload relay.
What are the different types of fuses?
Types of Fuses– Different Types of Fuses 1 DC fuses 2 AC fuses 3 Cartridge fuses 4 High voltage fuses 5 Thermal fuses 6 Automotive, blade fuses, or bolted type fuses 7 D-type cartridge fuses or D-type fuse 8 Rewireable fuse 9 Resettable fuses 10 HRC (high rupturing capacity) fuse or link type cartridge fuse
How to choose the right fuse for your circuit?
Here are a few steps to help you choose the right fuse: 1 Know the type of voltage 2 Monitor the ampere rating of the circuit your fuse will protect 3 Make sure the fuse matches the fuse holder 4 Inspect the fuse (in case you need to replace the internal element) 5 Choose a fuse with an inspection window More
How does a fuse work?
The most basic type of fuse equips a resistive element because of its melting point. As current flows into the element, it creates a tiny voltage drop across the element (small enough not to affect the circuit downstream). This process dissipates some power as heat. Thus, increasing the resistive element’s temperature.