Glass Ribbon Fuse

Mechanical Components

Fuses - Circuit Breakers - Surge Protectors

[Mechanical Fuse] [Passive Fuse]
[Circuit Breaker] [Surge Protector]
[Fuse Holder]

This is a listing of Fuse manufacturers and Vendors. The listing is subdivided into Passive, and Mechanical.
The types of products or devices they produce are listed under the company name, in alphabetic order.

Mechanical Fuse Manufacturers

The most commonly used mechanical fuse sizes are: 5mm x 20mm and 6.3mm x 32mm [1/4" x 1 1/4"].
A table of physical fuse sizes is provided after the manufacturers listing.

Fuse Vendors;

AEM, Inc {Hi-Rel Fuses, Chip Fuse, QPL Certified/Mil-F-23419/12}

Bel {IEC 250V Radial, IEC 5 x 20 mm, 250V, UL/CSA 1/4 x 11/4, UL/CSA 125V Micro, UL/CSA 4.6 x 19.5 mm, UL/CSA 5 x 15 mm, (2AG)}

Bussmann {Blade Fuses, Brick Fuses, Chip Fuses, Ferrule Fuses, Fuse Accessories, Subminiature Fuses}

Littelfuse Inc. {Automotive Type, Electronic Special Purpose, High Reliability and Military, Leaded and Cartridge, Electrical Fuses, Surface Mount (SMT)}

OptiFuse {1/4" x 1 1/4", 5 x 20mm (US version), 5 x 20mm (EUR version), 5 x 15mm, 3.6 x 10mm, Telecom -Fuse/Fuseholder, Subminiature, Surface Mount, Micro Fuse, Limiters, Automotive Link, Automotive Blade, Automotive Glass, Industrial}

Schurter {Power Entry Fuse - Chip}

SIBA Fuses LLC {North American and European Standard TYPE SQB Sizes 1, 2 AND 3. European Class: gR/aR/gRL}

Vishay {Fuses, Non-Resettable, Fusible Fixed Resistors}

Physical Sizes of Fuses: [Bold Devices are in common use]
5mm x 20mm: .29" x .79"
1AG: 1/4" x 5/8"
2AG (5mm @ 15mm): .2" x .59"
3AG: 1/4" x 1 1/4"
4AG: 9/32" x 1 1/4"
5AG: 13/32" x 1 1/2"
7AG: 1/4" x 7/8"
8AG: 1/4" x 1"
Surface mount fuse sizes; 0402 [1005], 0603 [1608], 1206 [3216], 6125, 1025

Cartridge Fuse

How to select a Fuse:
Fuse Selection: In general fuse values should be selected so that the normal continuous circuit current is 75% of the fuse's value. So a 1 amp fuse should be selected for a circuit with a normal continuous current of 750mA. The fuse value should be adequate to protect against the short circuit currents that the particular equipment or circuit can be exposed to.

Fuses are rated for a ambient temperature rating of 25oC [ambient temperature around the fuse, not the room]. So under normal operating conditions derate a Fuse 25% [normal current / .75] while operating at 25oC. Another rule of thumb to protect a circuit from excessive current is to select the fuse value for 125% [normal current x 1.25] over the normal circuit load. To protect against a direct short, select the fuse value as 150% above the normal circuit current. Fuse current is de-rated based on the fuse type and ambient temperature of the air. In general de-rate the current rating 5 to 10% per 10oC of temperature increase, check the manufacturer for derating information.

Circuit designs having high in-rush or turn-on current may require the use of a 'slow-blow' fuse to allow the momentary current spike to pass with out blowing the fuse. Power supplies and motors are two devices that have large in-rush currents.
The voltage rating of the fuse does not indicate the operational voltage of the fuse.

Select a fuse with a voltage rating equal to or in excess of the circuit voltage.
The voltage rating determines the maximum voltage that will not jump the gap between the elements after the fuse has already blown.
So the fuse will operate at the rated voltage and any voltage below the rating. However; refer to the AC/DC Maximum Voltage Rating.

Fuse Class; J, R, CC, L, G, H, C, CA, CB, T

Refer to the National Electrical Code [NEC] or the code used in your area for premises wiring requirements. Fuse selection for structures are well document, and not addressed on this page. An Electrician selects fuse sizes based on wire gauge [AWG] and insulation, the fuse is designed to protect the building wiring not the equipment in the building. Electrical Engineers select fuse size to protect equipment. The text listed above is a general guide for fuse selection for electronic equipment and is based on the information provided. Actual fuse selection should be based on the standard or specifications the equipment is being designed to.

Automotive Blade Fuse

Fuse types; Body styles:

Axial Leaded Fuse [Leaded], Blade Fuse [ATO/ATC], Ferrule Fuse [Glass/Ceramic round cylindrical],
Plug Fuse [Edison base], Radial Leaded Fuse [Leaded], Surface Mount Fuse [SMD Fuse], Wafer Fuse [ANL/CNL]

Blade Fuse
Blade Fuse current ratings; 5A Orange, 10A Red, 15A Blue, 20A Yellow, 25A Clear, 30A Green.
Colored or clear plastic case with 2 flat terminals to connect to a socket.

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Passive Fuse Manufacturers

PPTC: Polymeric Positive Temperature Coefficient [shown to the right].
PPTC devices normally have a low resistance.
As its temperature rises via an increase in the ambient temperature or an increase in current,
the device will exhibit a large non-linear increase in resistance.
The resistance will decrease back to normal once the body temp is lowered ~ making these fuses [automatically Reset-able].

Varistor: Resistance [flow of current] changes as a function of applied voltage voltage.
A varistor may also be called a VDR [Voltage Dependent Resistor].
Varistors will have a negative voltage coefficient [high resistance at low voltages and a low resistance at high voltages].

metal Oxide Varistor: [MOV] See listing above. MOV devices are used in parallel with the load.

Red dip-molded through-hole Polyswitch

Fuse Vendors;

Bourns {Telecom Ceramic PTC Resettable Fuses, Polymer PTC Resettable Fuses}


Littelfuse Inc. {PTC Fuse}

Schurter {Polymer Fuse}

tyco Electronics {reset-able PPTC Fuses}

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Surge Protector Manufacturers

List of companies which produce TVS devices
Transient Voltage Suppressor: 'TVS', is designed to absorb a transient over-voltage.
The device may be designed as Uni-Polar device protecting in one direction or a Bi-Polar device protecting the circuit in both directions.
TVS manufacturers are listed on the Transient Voltage Suppressor page [Nonlinear Resistor Manufacturers].
TVS devices are used in parallel with the load.
Place the TVS at the point the signal enters the board, so that the TVS components shorts the over-voltage on before reaching any components.

Surge Protection Vendors;

Citel Inc. {Coaxial Surge Suppressor, Surge Arrester}

Circuit Components Inc. {EMI/RFI Components - Surge Suppressor - TVSS}

Littelfuse Inc. {Surge Protectors}

Schurter {Power Entry Fuse - Chip-Surge Tolerant}

Telebyte Technology Inc. {RS-485 DIN Surge Protector}

tyco Electronics

Fuse Holder Manufacturers; This listing has moved to the Fuse Holder Manufacturers page.
Circuit Breaker Manufacturers; has moved to the Circuit Breaker page.

Fuse Manufacturer top

A listing of Fuse manufacturers and Vendors. The types of products or devices they produce are listed under the company name, in alphabetic order.
Additional component manufacturers may be found by selecting the Components icon below.
Equipment manufacturers may be found by selecting the OEM Equipment icon.

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Modified 2/16/12
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