Hardware
Mechanical Components
[Mechanical Fuse] [Passive
Fuse]
[Circuit Breaker] [Surge
Protector]
[Fuse
Holder]
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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.
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
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}
Ferraz Shawmut, Inc.
{Large Industrial Fuses}
Littelfuse Inc.
{Automotive Type, Electronic Special Purpose, High Reliability and Military, Leaded and Cartridge, Electrical Fuses, Surface Mount (SMT)}
OptiFuse
{¼" x 1¼", 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] |
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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. 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.
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.
Fuse types; Body styles:
Axial Leaded Fuse, Blade Fuse [ATO/ATC], Ferrule Fuse [Glass/Ceramic round cylindrical],
Plug Fuse [Edison base], Radial Leaded Fuse, Surface Mount Fuse [SMD], Wafer Fuse [ANL/CNL]
PPTC: Polymeric Positive Temperature Coefficient.
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.
Bourns {Telecom Ceramic PTC Resettable Fuses, Polymer PTC Resettable Fuses}
Littelfuse Inc. {PTC Fuse}
Schurter {Polymer Fuse}
tyco Electronics {reset-able PPTC Fuses}
List of companies which produce TVS devices {This web site}
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.
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}
Fuse Holder
Manufacturers; This listing has moved to the
Fuse Holder Manufacturers page.
Circuit Breaker Manufacturers; This listing has moved to the
Circuit Breaker page.
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, or Equipment manufacturers may be found by selecting the OEM Equipment icon.
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