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Fuse Holder& Inline Fuse|Basic,Application, Installation and More

Author: Apogeeweb
Date: 8 Apr 2022
inline fuse holder


Ⅰ Fuse holder basics

    1.1 What is a Fuse Holder?

    1.2 Features of the Fuse Holder

    1.3 Standards of the Fuse Holder

    1.4 Thermal Considerations of Fuses and Fuse Holders

    1.5 Application of Fuse Holder

    1.6 Design Strategies of Fuses and Fuse Holders

Ⅱ Automotive Blade Fuse Holders

    2.1 Sealed Mini Fuse Holder

Ⅲ Fuse Blocks, Fuse Holders & Fuse Covers

Ⅳ Fuse Holder, Fuse Carrier & Fuse Clip

Ⅴ Inline Fuse & Inline Fuse Holder

    5.1 What is an Inline Fuse?

    5.2 What Does an Inline Fuse Look Like?

    5.3 What Does an Inline Fuse Do?

    5.4 Replacing an Inline Fuse

    5.5 How to Install an Inline Fuse

    5.6 How Does an Inline Fuse Work?

    5.7 How to Install an Inline Fuse Holder

    5.8 Fuses vs. Circuit Breakers

Ⅵ LED Blow Fuse Indicators/LED Fuse Holders

    6.1 How Does an LED Blown Fuse Indicator Work?

    6.2 Glass Fuse Holders

    6.3 AGC Fuse Holders

    6.4 ATM/Mini Fuse Holders

    6.5 Low Profile Fuse Holders

Ⅶ Quality Industrial Fuse Products at Low Prices


Fuse holders and blocks are simple components that provide a critical function: mounting, enclosing, and safeguarding electrical fuses. Circuit protection is frequently included in electronic devices. In the event of a circuit overload, the principal duty is to protect both the equipment and the equipment operator. This safeguard is usually in the form of a circuit breaker or a fuse. A circuit breaker is an automated switch that stops the passage of electric current when it is rapidly overloaded or under extremely high stress. A fuse is a type of safety device that protects an electrical circuit against overcurrent. Imperial has everything you need, including open and enclosed alternatives. Choose from a variety of clip, block, socket, and plug-on cap styles in a variety of amperages. You'll have peace of mind knowing that your fuses are safely and continually protected in any commercial, industrial, or automobile application. The article will direct you to the necessary information and dispel any doubts you may have.

Ⅰ Fuse holder basics

1.1 What is a Fuse Holder?

DIY Mount A Panel-Mount Fuse Holder

A fuse holder, as the name implies, is a device that retains an electrical fuse. They are available in a variety of styles, each tailored to a certain fuse. A fuse holder's style and size are directly tied to the type and current rating of the fuse it is designed to retain. A blade fuse, for example, will not fit in a cartridge fuse holder. To help prevent electrical damage, many fuses and fuse holders incorporate specific features that prevent fuses of the correct style but incorrect current rating from being put in the holder. Furthermore, certain fuse holder models allow the fuse to be removed by hand, whereas others require the use of a specific tool.

Electronic fuse holders are commonly classified into four types: Printed Circuit Board (PCB) Fuse Clips, Printed Circuit Board Fuse Holders, Panel Mount Fuse Holders, and In-Line Fuse Holders.

PCB Fuse Clips – Most cost-effective, with the lowest purchase cost but the fewest features. They usually need to be isolated and insulated from the environment, yet they have a wide range of applications.


PCB Fuse Holders – Most cost-effective, with the lowest purchase cost but the fewest features. They usually need to be isolated and insulated from the environment, yet they have a wide range of applications.

pcb- fuse-holders

Panel Mount Fuse Holders – They are normally wire-in, wire-out/line, and load, and when installed appropriately, they can protect people from electrical risks when mounted through an enclosure or on a back plane of an enclosure.


In-Line Fuse Holders – These wire-in, wire-out/line and load fuse holders are essentially self-contained wire harnesses that offer a wide range of application versatility. Depending on the designer's objective and where they are situated, they can allow for both easy fuse replacement and make fuses more difficult to access.


1.2 Features of the Fuse Holder

Waterproofing, vibration resistance, and a blow fuse warning are all common features of fuse holders.

1.3 Standards of the Fuse Holder

Users of UL/CSA-compliant fuse holders are accustomed to a fuse carrier with a knurled cap that allows them to reach and change a fuse without the need for tools. However, some international equipment standards limit the degree of user accessibility to a fuse holder to reduce the risk of electrical shock to a non-technical user. The limited access fuse holder is built to necessitate the use of a tool (usually a screwdriver). It also includes extra insulation and insulating barriers to prevent the presence of living conducting services during fuse change procedures.

Approvals and ratings for fuse holders include UL, CSA, BSI, VED, IEC (UMF), SEMKO, and Dentori.

  • The UL Listing guarantees that a fuse has been manufactured in full compliance with the UL 248-14 standard. UL recognition, c-UL Listing, c-UL Recognition, c-UL-us Listing and c-UL-us Recognition does not imply full compliance with UL-248-14. 
  • CSA Canadian approval that guarantees the a fuse or fuse holder has been manufactured in full compliance with the CSA C22.2 No. 248.14 or CSA C22.2 No. 39 standard, respectively.
  • The BSI British approval guarantees that a fuse has been manufactured in full compliance with the appropriate section of IEC 60127 (BS 4265) standard.
  • The VDE German clearance ensures that a fuse or fuse holder was manufactured in complete compliance with the relevant provision of the IEC 60127 standard.
  • IEC approval pertains to Universal Modular Fuses (UMF) that have been verified to be compliant with IEC 60127-4.
  • SEMKO Swedish clearance ensures that a fuse or fuse holder was manufactured in complete compliance with the relevant portion of the IEC 60127 standard.

1.4 Thermal Considerations of Fuses and Fuse Holders

When designing a piece of equipment that will use fuses and fuse holders, the design engineer(s) must consider thermal influences such as ambient temperature and heat rise to the temperature specifications of the fuses and fuse holders to select the best components for the applications and possibly expand the design to alleviate problems with heat build-up. It is critical to choose the best fuse and fuse holder combo. Among other things, the engineer must ensure that the maximum permissible power acceptances and temperatures specified by the fuse holder's manufacturer are adhered to.

Factors to Consider Include:

  • The effect of power dissipation in fuse holderconnections
  • The chosen fuse's rated power dissipation
  • Acceptable power acceptance, temperature ratings, and fuse holder operating current
  • Temperatures of the ambient air both inside and outside the apparatus
  • Altering the electrical load
  • Long-term operation with a load greater than 0.7In
  • Heat impacts of nearby components
  • Heat dissipation/cooling, as well as ventilation, are included in the equipment.
  • Connecting wire length and cross-section
  • The fuse holder's mounting orientation

Most fuse and fuse holder manufacturers provide thorough information on the aforementioned variables as well as great guide material for making the appropriate selections.

After considering the aforementioned factors, a decision on an acceptable fuse and fuse holder combination can be made. It is then recommended that testing be performed on the chosen devices under the worst-case operating conditions to validate the selection. If problems emerge that indicate excessive heat buildup, a new option or design alterations may be required to ease the situation.

1.5 Application of Fuse Holder

Glass and ceramic cartridge fuses, as well as automobile blade fuses, are held in place by fuse holders. We offer panel mount fuse posts, multi-fuse blocks, and inline holders.

1.6 Design Strategies of Fuses and Fuse Holders

The following are some things to think about while designing with fuses and fuse holders in mind. Due to the variety of conditions, a broad selection of fuse sizes and types are available to handle circuit protection, as well as different forms of fuse holders for putting the fuse into a circuit. To guarantee a satisfactory pairing, design considerations must include both the fuse and the fuse holder.

These include:

  • What size fuses would be most appropriate?
  • What are the load ratings for the application?
  • Is there a huge in-rush on the equipment when it first starts up?
  • How long can the device withstand an overload?
  • Is the overload large enough to physically destroy the fuse?

Thermal factors to consider:

  • The fuse link's power dissipation
  • The fuse holder's ratings
  • Temperatures inside and outside of the apparatus
  • Changes in electrical load
  • Long durations of operation
  • Ventilation, cooling, and heat dissipation are all important.
  • Wire lengths and diameters

Ⅱ Automotive Blade Fuse Holders

For Mini, Low Profile, Standard and Maxi Blade Fuses
PCB Mountable for Reliable Connection and Security

UL Recognition for PCB Auto Fuse Holder


  • Mini sizes are compatible with Littelfuse ATO 297 series and Bussman ATM series automotive blade fuses and come pre-assembled for quick mounting and soldering to the PCB. Suitable for applications requiring up to 20 Amperes
  • Littelfuse 0891 series and Bussman Low Profile ATM series automotive blade fuses are compatible with LP Mini sizes.
  • Suitable for applications requiring up to 20 Amperes
  • Standard sizes are compatible with automotive blade fuses from the Littelfuse ATO 257 series and the Bussman ATC series.
  • Suitable for applications requiring up to 30 Amperes
  • Littelfuse MAXI series and Bussman MAX series automotive blade fuses are compatible with Maxi sizes. Suitable for applications requiring up to 40 Amperes
  • In Thru-Hole Mount Cat Nos. 3557-2 and 3587, a 2 in 1 fuse holder is also available to accommodate both Standard and Low Profile Minitype Automotive Blade Fuses.

2.1 Sealed Mini Fuse Holder


  • Circuit and component safeguards
  • Electric motors
  • Compressors
  • Lighting
  • Pumps powered by electricity

Environmentally sealed circuit protection is required for high vibration applications in truck and bus, agriculture, construction, marine, and special vehicles industries.

Key Benefits:

  • Add a sealed fuse quickly and easily anywhere.
  • Several mounting options are provided, with mounting clips readily available.
  • Accepts tiny fuses that are industry standard.
  • For proven dependability, a high-performance AMP MCP terminal system is used.

Ⅲ Fuse Blocks, Fuse Holders & Fuse Covers

Fuse blocks, holders, and covers keep fuses secure and safe when they are attached to an electrical circuit. They're usually made to accommodate specified fuse classes, types, and sizes. Fuse blocks and holders provide an electrical connection point for installing fuses and retaining them in place to maintain circuit contact. Fuse block covers are attached to each fuse in a block to avoid accidental contact with live clips and terminals.

A fuse holder, as opposed to a fuse block, only carries one fuse to complete a single circuit. A fuse holder is especially beneficial in systems with a separate power source from the fuse block or that require a fusible link closer to the electrical system it serves. Whether you've lost power to one of your systems and the fuse isn't in the fuse box, verify if it has a separate fuse holder. If the fuse at the fuse holder is not blown, the fuse holder may need to be changed. If your automobile, truck, or SUV requires a new fuse holder,

Fuse block insulators can be made of phenolic or molded polycarbonate. All blocks fulfill the UL and CSA criteria for rated voltage clearance and creepage in common industrial control devices. All blocks have passed high current withstand short circuit tests and can be utilized up to the interrupting rating of the fuse class used.


Ⅳ Fuse Holder, Fuse Carrier & Fuse Clip

The fuse is held in place by a fuse holder, which is attached to the equipment. Fuse holders can accommodate both North American and international fuses. This is determined by the fuse carrier utilized. Panel-mount fuse holders are available from Interpower.

International "touch-proof" fuse holders are a well-liked option. This fuse holder is offered in three sizes: low-profile, high-profile, and low-profile/snap-in. Each of these comes in a variety of terminal designs, including fast disconnect, solder/quick disconnect, and angled variants of both. Interpower fuse holders take both North American and international fuse carriers and can be utilized in almost every market across the world. These fuse holders have the added feature of being touch-proof, which increases the end user's safety—the blown fuse can only be retrieved from the outside of the equipment with a tool and cannot touch any of the contact surfaces before the fuse carrier and fuse are removed.

On fuse holders, approvals are available.

A fuse carrier is the fuse holder's "cap." It transports the fuse into the holder and secures it in place. One advantage of combining a fuse carrier with a fuse holder is that they are touch proof.

¼ x 1-¼ For inch Fuse

For 5 x 20mm Fuse

P/N: 80920200

P/N: 80920210

Two Examples of a Fuse Carrier

Fuse Clip

A fuse clip is used to secure internal fuses on PC boards. One fuse necessitates the use of two clips.

Fuse clips, which have many of the same characteristics as fuse blocks, are an alternative to fuse blocks.

Fuse clips can be soldered to a printed circuit board or screwed into a panel. Fuse clips are an intriguing alternative to PC-Board mount fuse holders since they are reasonably affordable. Interpower fuse clips are only available in one size. They are PC-board mounted and can only be accessed from within the equipment. It has a "stop" on it to aid in the positioning of the fuse when it is placed.Fuse clips do not have any approvals unless they are part of a final product. They are an appealing alternative to post-style and PC-board mount fuse holders due to their low cost. When using fuse clips, the designer must keep in mind that each end is a different piece. For each fuse that is used, two clips must be ordered.

Ⅴ Inline Fuse & Inline Fuse Holder

5.1 What is an Inline Fuse?

Fuses are electrical and electronic components that serve as safety devices. An in-line fuse differs from other types of fuses in that it is contained within a cable rather than a ceramic or glass cartridge. If you're looking for an in-line fuse, discover more about its purposes and how it works, then contact Gateway Cable Company for more information about our in-line fuse assemblies.

5.2 What Does an Inline Fuse Look Like?

In-line fuses are often made up of two cables connected by a fuse and fuse holder or fuse box. One cable connects to the positive power supply, while the other connects to the device or equipment being powered. The fuse used to separate the two cables protects the circuit of whatever is being provided. The householder, often known as a fuse box, protects the fuse and is frequently watertight.

5.3 What Does an Inline Fuse Do?

What Does an Inline Fuse Do?

An in-line fuse, like other types of fuses, serves to protect the circuit of a piece of electrical or electronic equipment. When an electrical device is unexpectedly overcharged with current, the filament within the fuse melts and the circuit is broken. In-line fuses differ from other types of fuses in appearance but function the same way. Automotive is one of the most prevalent applications for in-line fuses. Starter motors often consume the most current of any component within a car. In-line fuses, which are meant to break the circuit if it becomes overloaded, are frequently employed to protect the alternator.

5.4 Replacing an Inline Fuse

To replace an in-line fuse, detach the two connecting halves and split the fuse holder or fuse box into two portions. After separating the two parts, replace the old fuse with a new one.

5.5 How to Install an Inline Fuse

While there are many other types of fuses available to assist you in achieving or maintaining the power you require, an inline fuse can be a wonderful component to ensure an even distribution of electricity for your circuit. So, if you need to add a fuse holder to your car or some of your home's lighting, you'll need to know how to install an inline fuse line correctly. Fortunately, the professionals at Gateway Cable Company are here to explain all you need to know to get the job done!

5.6 How Does an Inline Fuse Work?

If you've never used an inline fuse holder before, you're probably thinking, "How does an inline fuse holder work?" An inline fuse, like other fuses, is used to manage the current of electricity running through your circuit and is intended to protect extra electrical components in your car. An inline fuse will split up the current if your circuit becomes overcharged, preventing any potential damage.

5.7 How to Install an Inline Fuse Holder

When it comes to installing inline fuses, you'll need a few tools to get the job done correctly. A pair of wire cutting and stripping pliers, crimping pliers, butt-splice crimp connectors, and, of course, the right amperage-rated fuse holder are all required. Once you have all of these supplies, carefully follow these procedures to install an inline fuse holder:

step 1

Unplug your gadget from the power source.

step 2

Using the wire cutting pliers, cut the positive wire closest to your circuit.

step 3

Using the wire-stripping pliers, cut 1/4-inch from each end of the split wires and the fuse holder. To avoid damaging the internal components of the inline fuse, keep the wires tight during stripping.

step 4

Spiralize your circuit wires to make the stripped ends firmer and easier to attach.

step 5

Using the crimping pliers, insert the twisted circuit wire into the butt-splice crimp connection.

step 6

Using the crimping pliers, insert either end of the fuse holder wires into the other end of the butt-splice connector. Make certain that both ends are securely fastened.

step 7

While clamping the wire, twist the leading device wire and put it into a butt-splice connection.

step 8

Twist the fuse holder's other wire end and place it into the butt splice attached to the wire heading to the device, then crimp down.

step 9

Insert the appropriate amperage fuse into the fuse holder and join the halves by pressing down and securing them in place.

step 10

Repair your device's power supply.


5.8 Fuses vs. Circuit Breakers

Fuses and circuit breakers both serve the same purpose: to prevent over-current situations that could be hazardous to one's safety. They are not the same, despite the fact that they are frequently misunderstood. As previously stated, fuses are replaceable; in over-current situations, the filament inside a fuse's cartridge will melt and shut down the circuit. Circuit breakers are a sort of resettable fuse in several ways. When the load on a circuit exceeds the load on a breaker, the breaker employs a bimetal strip or solenoid to trip the switch and protect the circuit. Breakers that have been tripped can be readily reset and do not need to be replaced.

Ⅵ LED Blow Fuse Indicators/LED Fuse Holders

6.1 How Does an LED Blown Fuse Indicator Work?

An LED blown fuse indicator is used to quickly and simply determine whether or not a fuse needs to be replaced without removing it from the fuse holder. The indication is made up of two contact wires, one for the line and one for the load, as well as a high value resistor and an LED indicator. The wires are connected to the fuse's respective ends. If the fuse is good and thus conducting electricity, the majority of the current flows through it; if the fuse is bad, current from the circuit flows through the indicator, illuminating the LED light. In layman's terms, a lit bulb means a blown fuse.

6.2 Glass Fuse Holders

  • Water-resistant inline glass fuse holder: for AGC and SFE glass fuses, certified for a maximum of 30 amps; yellow neoprene for high visibility
  • Universal inline glass fuse holder: for AGC and SFE type fuses, rated for a maximum of 30 amps; Snap-Lock design ensures a strong positive union of fuse holder housing; ROHS compliance
  • Heavy-duty inline glass fuse holder: rated for a maximum of 60 amps; 6" loop length, 8-gauge wire; ROHScompliant

6.3 AGC Fuse Holders

  • Light duty ATO/ATC MidBlade fuse holder: rated for 15 amps maximum; 12" loop length, 16-gauge wire
  • Inline ATO/ATC heavy duty fuse holder: 30 Amp inline blade fuse holder; 12" loop length, 12-gauge wire; 30 Ampfuse included
  • Inline ATO/ATC stackable fuse holder: 30 amp inline blade fuse holder with weather-resistant cover; 5.5" loop length, 12-gauge wire; 30 amp fuse included
  • Self-stripping ATO/ATC fuse holder: rated for 40 amps maximum; no need to strip wire—enter each wire and crimp the holder closed, then insert fuse to complete the circuit.
  • Inline ATO/ATC fuse holder with cover rated for 30 amps maximum; accommodates 12-gauge and smaller wire; screws tighten wire; fuse and two weather-tight covers included
  • Waterproofing ATO/ATC fuse holder: rated for 30 amps maximum; two 4" 12-gauge lead wires; snap-on cover with mounting hole included; ROHS compliant.
  • ATO/ATC fuse holder rated for 20 amps maximum; 12" loop length, 14-gauge wire
  • Medium duty inline AGC glass fuse holder: accepts ACG and SFE fuses, rated for a maximum of 20 amps; 14-gauge wire, 8" loop; ROHS compliant

6.4 ATM/Mini Fuse Holders

  • Inline ATM mini fuse holder with cap ring terminals: includes a 15 Amp mini fuse with 5/16" diameter ring terminals attached to 3-1/4" wires; 12-gauge wire, 10-5/8" loop.
  • Stackable micro fuse holder for ATMs in line:
  • 30 amp micro blade fuse holder with 12 gauge wire and 5-1/2" wire leads; weather resistant lid; fuse included
  • Mini fuse holder for ATMs inline with a cover:
  • 20-amp fuse holder with 16-gauge wire and two 6-inch wire leads; water resistant lid; RoHS compliant
  • ATM small fuse holder: weatherproof, rated for 30 amps maximum; two 5" wire leads, 12-gauge wire

6.5 Low Profile Fuse Holders

  • Low profile inline fuse holder with splash-proof cover: rated for 20 amps maximum; 5" wire leads, 14-gauge wire; ROHS compliant
  • Low profile inline fuse holder with weather-resistant cover: rated for 10 amps maximum; 6" wire leads, 18-gauge wire

Ⅶ Quality Industrial Fuse Products at Low Prices

Fuse holders and fuse blocks are available from Automation Direct in a variety of styles.

  • Fuse Holders & Accessories with a Small Dimension of 1/4 inch
  • 5mm Fuse Holders & Accessories in Small Dimensions
  • Fuse Holders & Accessories for Class CC & Midget (30A)
  • Fuse Blocks & Accessories for Modular Class CC & Midget (30A)
  • Fuse Holders & Accessories for Modular Class J (30 - 60A)
  • Fuse Blocks and Accessories for Modular Class J (30-600A)
  • Fuse Blocks & Accessories for Modular Class J Power Distribution (100-400A)
  • Fuse Holders, Fuse Blocks, and Accessories (30-600A) Class RK1 and RK5 Fuse Blocks and Accessories (30-600A)

Fuse Blocks and Accessories for the Modular Class RK1 and RK5 (30-600A)

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