Different Types of Fuses and Their Uses

Do you know that there are different sizes and types of electrical fuses and that using the wrong size and type of fuse can be dangerous? Our local Mesa AZ electricians often go on routine service calls and find that the wrong kind of fuses are being used but more dangerous is that the wrong size fuses were installed.

This creates a very real fire hazard because the fuse is designed to protect the attached wire by limiting the amount of electrical current that can safely flow across the wire. When a larger fuse is installed it creates the possibility for the attached wire to overheat and start a fire because it can carry an unsafe amount of electrical current. This “over-fusing” is commonly seen when fuses keep blowing but it should never be done. See our page about blowing fuses for safe solutions or contact our local electricians in Mesa AZ for a free over the phone consultation.

Have you installed the right fuses in your fuse box?

With all the various types of fuses available chances are that the wrong type of fuse is installed in your fuse box. An electrical fuse’s primary job is to protect the wiring from overheating but it must also be able to work in conjunction with the devices on the circuit. This is where the different kinds of fuses needs to be considered.

  • Example #1:
    A 15 amp fuse that is used to protect a motor circuit would need to account for a temporary increase of electrical power above 15 amps when the motor first turns on. If the same fuse was used on a different circuit, like a lighting circuit, there would be an unnecessary delay in protecting the wire should the fuse blow.
  • Example #2:
    A 15 amp fuse that protects a lighting circuit would not last as long if it was used on a motor circuit. It may even blow within seconds if the motor is large enough. This happens because this type of fuse does not account for temporary increases in electrical power caused by motor start-ups. Unknowingly, inexperienced individual will often put in a larger fuse, instead of a different type of fuse, to make the motor work not realizing that they have compromised the primary job of the fuse which is protecting the electrical wiring from overheating.

The local Mesa electricians at Dolce Electric Co are committed to electrical safety awareness and we have listed below many of the different kinds of fuses that are commonly used in fuse boxes throughout Mesa. We have also scheduled an in-office electrician Mesa AZ homeowners and businesses can call free of charge today, Wednesday, May 27th, 2020, between 8:00 Am and 5:00 PM. He will answer all of your questions about the various types of fuses and their different uses.

The Different Fuses and Recommended Type of Use

20 Amp Mini Circuit Breaker - Electrical Fuse Replacement 20 Amp Mini Circuit Breakers
Replaces 20 Amp Edison Base Plug Fuses
Resettable if blown
15 Amp Mini Circuit Breaker - Electrical Fuse Replacement 15 Amp Mini Circuit Breakers
Replaces 15 Amp Edison Base Plug Fuses
Resettable if blown
Type T Fuses Type T Fuses
These types of Edison base fuses are industrial strength.
Good when motors turn on and off frequently.
Available in 15, 20, 25 and 30 amp size fuses
Type W Fuses Type W Fuse
These types of Edison base fuses are obsolete and
should be replaced with
Type T or Type TL fuses.
Type TL Fuses Type TL Fuse
These types of Edison base fuses are good for residential circuits.
Available in 15, 20, 25 and 30 amp size fuses
Type SL Fuses Type SL Fuses
This type of fuse is good for residential circuits.
Available in 15, 20, 25 and 30 amp sizes fuses
Type TC Fuses Type TC Fuse
This type of fuse is good for residential motor circuits.
Available in 15, 20, 25 and 30 amp size fuses
Type S Fuses Type S Fuses
This type of fuse is industrial strength.
Good when motors turn on and off frequently.
Available in 15, 20, 25 and 30 amp sizes
Type P Fuses Type P Fuse
This type of fuse is good for lighting circuits and other non-inductive loads.
Available in 15, 20, 25 and 30 amp size fuses
Electrical Adapter For Converting Edison Base To Different Types Of Bases Fuse Adapters
Converts the Edison base into the Rejection base. Prevents over-fusing and brings Edison base fuse boxes up to code compliance.
LP-CC Time Delay Fuse LP-CC Time Delay Fuse Dimensions LP-CC – 600Vac/300Vdc, 1/4-30 Amp, Time Delay Fuse
Available Amperage: 1/4 amp through 30 amp fuses
See diagram (left) for actual size and chart below for applications (Yellow)
<span class='hiddenSpellError wpgc-spelling' style='background: inherit;'>FNQ</span> R 600 Volt Time Delay Fuse <span class='hiddenSpellError wpgc-spelling' style='background: inherit;'>FNQ</span> R 600 Volt Time Delay Fuse Dimensions FNQ-R-600Vac, 1/4-30 Amp, Time Delay Fuse
Available Amperage: 1/4 amp through 30 amp fuses
See diagram (left) for actual sizes and chart below for applications (Black)
<span class='hiddenSpellError wpgc-spelling' style='background: inherit;'>KTK</span> R 600 Volt Fast Acting Fuse <span class='hiddenSpellError wpgc-spelling' style='background: inherit;'>KTK</span> R 600 Volt Fast Acting Fuse Dimensions KTK-R-600Vac, 1/10-30 Amp, Fast Acting Fuse
Available Amperage: 1/10 amp through 30 amp fuses
See diagram (left) for actual sizes and chart below for applications (Black)
LPN RK 250 Volt Dual Element Time Delay Fuse LPN RK 250 Volt Dual Element Time Delay Fuse Dimensions LPN-RK-250Vac/dc, 1/10-60 Amp, Dual Element, Time Delay Fuse
Available Amperage: 1/10 amp through 60 amp fuses
See diagram (left) for actual sizes and chart below for applications (Yellow
<span class='hiddenSpellError wpgc-spelling' style='background: inherit;'>KTN</span> R 250 Volt Fast Acting Fuse <span class='hiddenSpellError wpgc-spelling' style='background: inherit;'>KTN</span> R 250 Volt Fast Acting Fuse Dimensions KTN-R-250Vac, 1/10-60 Amp, Fast Acting Fuse
Available Amperage: 1/10 amp through 60 amp fuses
See diagram (left) for actual sizes and chart below for applications (Black)
<span class='hiddenSpellError wpgc-spelling' style='background: inherit;'>FRN</span> R 250 Volt Dual Element Time Delay Fuse <span class='hiddenSpellError wpgc-spelling' style='background: inherit;'>FRN</span> R 250 Volt Dual Element Time Delay Fuse Dimensions FRN-R-250Vac/125Vdc, 1/10-60 Amp, Dual Element, Time Delay Fuse
Available Amperage: 1/10 amp through 60 amp fuses
See diagram (left) for actual sizes and chart below for applications (Green)
NON 250 Volt General Purpose Fuse NON 250 Volt General Purpose Fuse Dimensions NON (250Vac), 1/8-60 Amp, General Purpose Fuse
Available Amperage: 1/8 amp through 60 amp fuses
See diagram (left) for actual sizes and chart below for applications (Gray)
JPJ 600 Volt Dual Element Time Delay Fuse JPJ 600 Volt Dual Element Time Delay Fuse Dimensions LPJ-600Vac/300Vdc 1-60 Amp, Dual Element, Time Delay Fuse
Available Amperage: 1 amp through 60 amp fuses
See diagram (left) for actual sizes and chart below for applications (Yellow)
<span class='hiddenSpellError wpgc-spelling' style='background: inherit;'>JKS</span> 600 Volt Fast Acting Fuse <span class='hiddenSpellError wpgc-spelling' style='background: inherit;'>JKS</span> 600 Volt Fast Acting Fuse Dimensions JKS-600Vac, 1-60 Amp, Fast Acting Fuse
Available Amperage: 1 amp through 60 amp fuses
See diagram (left) for actual sizes and chart below for applications (Black)
<span class='hiddenSpellError wpgc-spelling' style='background: inherit;'>LPS</span> RK 600 Volt Dual Element Time Delay Fuse <span class='hiddenSpellError wpgc-spelling' style='background: inherit;'>LPS</span> RK 600 Volt Dual Element Time Delay Fuse Dimensions LPS-RK-600Vac/300Vdc, 1/10-60 Amp, Dual Element, Time Delay Fuse
Available Amperage: 1/10 amp through 60 amp fuses
See diagram (left) for actual sizes and chart below for applications (Yellow)
<span class='hiddenSpellError wpgc-spelling' style='background: inherit;'>KTS</span> R 600 Volt Fast Acting Fuse <span class='hiddenSpellError wpgc-spelling' style='background: inherit;'>KTS</span> R 600 Volt Fast Acting Fuse Dimensions KTS-R-600Vac, 1/10-60 Amp, Fast Acting Fuse
Available Amperage: 1/10 amp through 60 amp fuses
See diagram (left) for actual sizes and chart below for applications (Black)
FRS R 600 Volt Dual Element Time Delay Fuse FRS R 600 Volt Dual Element Time Delay Fuse Dimensions FRS-R-600Vac/300Vdc, 1/10-60 Amp, Dual Element, Time Delay Fuse
Available Amperage: 1/10 amp through 60 amp fuses
See diagram (left) for actual sizes and chart below for applications (Green)
NOS 600 Volt General Purpose Fuse NOS 600 Volt General Purpose Fuse Dimensions NOS (600Vac), 1-60 Amp, General Purpose Fuse
Available Amperage: 1 amp through 60 amp fuses
See diagram (left) for actual sizes and chart below for applications (Gray)
<span class='hiddenSpellError wpgc-spelling' style='background: inherit;'>LPJ</span> 600 Volt Dual Element Time Delay Fuse <span class='hiddenSpellError wpgc-spelling' style='background: inherit;'>LPJ</span> 600 Volt Dual Element Time Delay Fuse Dimensions LPJ-600Vac/300Vdc 70-600 Amp, Dual Element, Time Delay Fuse
Available Amperage: 70 amp through 600 amp fuses
See diagram (left) for actual sizes and chart below for applications (Yellow)
<span class='hiddenSpellError wpgc-spelling' style='background: inherit;'>JKS</span> 600 Volt Fast Acting Fuse <span class='hiddenSpellError wpgc-spelling' style='background: inherit;'>JKS</span> 600 Volt Fast Acting Fuse Dimensions JKS-600Vac, 70-600 Amp, Fast Acting Fuse
Available Amperage: 70 amp through 600 amp fuses
See diagram (left) for actual sizes and chart below for applications (Black)
LPN RK 250 Volt Dual Element Time Delay Fuse LPN RK 250 Volt Dual Element Time Delay Fuse Dimensions LPN-RK-250Vac/dc, 70-600 Amp, Dual Element, Time Delay Fuse
Available Amperage: 70 amp through 600 amp fuses
See diagram (left) for actual sizes and chart below for applications (Yellow)
<span class='hiddenSpellError wpgc-spelling' style='background: inherit;'>KTN</span> R 250 Volt Fast Acting Fuse <span class='hiddenSpellError wpgc-spelling' style='background: inherit;'>KTN</span> R 250 Volt Fast Acting Fuse Dimensions KTN-R-250Vac, 70-600 Amp, Fast Acting Fuse
Available Amperage: 70 amp through 600 amp fuses
See diagram (left) for actual sizes and chart below for applications (Black)
<span class='hiddenSpellError wpgc-spelling' style='background: inherit;'>FRN</span> R 250 Volt Dual Element Time Delay Fuse <span class='hiddenSpellError wpgc-spelling' style='background: inherit;'>FRN</span> R 250 Volt Dual Element Time Delay Fuse Dimensions FRN-R-250Vac/125Vdc, 70-600 Amp, Dual Element, Time Delay Fuse
Available Amperage: 70 amp through 600 amp fuses
See diagram (left) for actual sizes and chart below for applications (Green)
NON 250 Volt General Purpose Fuse NON 250 Volt General Purpose Fuse Dimensions NON (250Vac), 70-600 Amp, General Purpose Fuse
Available Amperage: 70 amp through 600 amp fuses
See diagram (left) for actual sizes and chart below for applications (Gray)
<span class='hiddenSpellError wpgc-spelling' style='background: inherit;'>LPS</span> RK 600 Volt Dual Element Time Delay Fuse  <span class='hiddenSpellError wpgc-spelling' style='background: inherit;'>LPS</span> RK 600 Volt Dual Element Time Delay Fuse Dimensions LPS-RK-600Vac/300Vdc, 70-600 Amp, Dual Element, Time Delay Fuse
Available Amperage: 70 amp through 600 amp fuses
See diagram (left) for actual sizes and chart below for applications (Yellow)
 <span class='hiddenSpellError wpgc-spelling' style='background: inherit;'>KTS</span> R 600 Volt Fast Acting Fuse  <span class='hiddenSpellError wpgc-spelling' style='background: inherit;'>KTS</span> R 600 Volt Fast Acting Fuse Dimensions KTS-R-600Vac, 70-600 Amp, Fast Acting Fuse
Available Amperage: 70 amp through 600 amp fuses
See diagram (left) for actual sizes and chart below for applications (Black)
FRS R 600 Volt Dual Element Time Delay Fuse FRS R 600 Volt Dual Element Time Delay Fuse Dimensions FRS-R-600Vac/300Vdc, 65-600 Amp, Dual Element, Time Delay Fuse
Available Amperage: 65 amp through 600 amp fuses
See diagram (left) for actual sizes and chart below for applications (Green)
NOS 600 Volt General Purpose Fuse NOS 600 Volt General Purpose Fuse Dimensions NOS (600Vac), 70-600 Amp, General Purpose Fuse
Available Amperage: 70 amp through 600 amp fuses
See diagram (left) for actual sizes and chart below for applications (Gray)

If you have a question about which type of fuse to use you can call our in-office electrician in Mesa AZ free of charge. He will answer all of your questions about the different fuses and which types work best for different applications. Dolce Electric Co has been voted best electricians Mesa AZ and looks forward to earning your vote too.


Quick Find Use Chart

Air Conditioning Circuits
YES | YES | NO | NO
Battery Charge Stations
YES | NO | NO | NO
Branch Circuits – General
YES | YES | YES | YES
Capacitors
YES | YES | NO | NO
Conveyor Systems
YES | NO | NO | NO
Electric Heat
YES | NO | YES | NO
Elevator Controls
YES | NO | NO | NO
Emergency Lighting
YES | NO | YES | NO
Exterior Lighting
YES | NO | YES | NO
Generators
YES | NO | NO | NO
Industrial Lighting
YES | NO | YES | NO
Interior Lighting
YES | YES | YES | NO
Main Services
YES | YES | YES | YES
Motor Circuits
YES | YES | NO | NO
Transformers
YES | YES | NO | NO
UPS Power
YES | NO | NO | NO
Welding Circuits
YES | NO | YES | NO
 
DISCLAIMER:
This chart is for general informational purposes and should under no circumstance be interpreted as directions for individual or commercial use. Always consult with a qualified electrician before installing or replacing any fuses.

 

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