Readers ask: What Does The Meaning Of The Number On A Fuse?

How do you read a fuse number?

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.

What does the 15 on a fuse mean?

The current flowing through a circuit is the combined wattage of all operating devices divided by the voltage. On a 120V circuit, power consumption beyond 1800W will blow a 15-amp fuse (1800W / 120V = 15 amps ).

What do fuse ratings mean?

The fuse interrupting rating is the maximum amperage at rated voltage the fuse can safely interrupt. This rating must exceed the maximum fault (short-circuit) current the circuit can produce. Interrupting ratings for AC and DC currents are different and the fuse data sheet should be consulted before selection.

How do I know which fuse to buy?

The simple calculation is watts divided by volts equals amps. After you have calculated this, it is a simple case of adding around 10% to the value and choosing the nearest fuse to match. This is a more precise method then just guessing should you require a 3, 5, or even 13 amp fuse.

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How do I know what amp fuse to use?

You’ll usually find the fuse rating on the side of your fuse, which will be given in amps. Fuse rating is the amount of current needed for the fuse to blow or break.

What is a fuse symbol?

The symbol for a thermal fuse used in any electrical circuit diagram. A thermal fuse is a temperature sensitive switch. It operates on the temperature rather than the current unless the current is sufficient to increase the temperature above the threshold point. This symbol represents a fused switch.

Does the Colour of a fuse matter?

As long as all the other specifications match (specifically amperage, voltage and receptacle size), the color will not make a difference. These particular style of circuit breakers are not color coded. As long as the base matches and the amperage matches what the circuit was designed, then it should work fine.

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.

How can you tell if a 13A fuse is blown?

Remove the fuse from its holder. In some cases you may need a small screwdriver to unscrew the fuse holder cap. Look at the fuse wire. If there is a visible gap in the wire or a dark or metallic smear inside the glass then the fuse is blown and needs to be replaced.

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What are the 3 types of fuses?

Different Types of Fuses – Constriction, Working & Characteristics

  • DC Fuses.
  • AC Fuses.
  • Cartridge Fuses.
  • D – Type Cartridge Fuse.
  • HRC (High Rupturing Capacity) Fuse or Link Type Cartridge Fuse.
  • High Voltage Fuses.
  • Automotive, Blade Type & Bolted Type Fuses.
  • SMD Fuses (Surface Mount Fuse), Chip, Radial, and Lead Fuses.

Where are fuses used?

Fuses are widely used for protection of electric motor circuits; for small overloads, the motor protection circuit will open the controlling contactor automatically, and the fuse will only operate for short circuits or extreme overload.

How do I know what SMD fuse I have?

You can test your SMD fuses for proper working order with a basic multi-meter and a steady hand.

  1. Turn on the multi-meter and set it to “x1” ohms.
  2. Attach the red and black alligator clips to the fuse.
  3. Check for continuity.

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