Hardware
Mechanical Components
[Mechanical Fuse] [Passive Fuse]
[Circuit Breaker] [Surge
Protector]
[Fuse
Holder]
[Home]
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.
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] |
|
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.
Fuse types; Body styles:
|
PPTC: Polymeric Positive Temperature Coefficient [shown to the right]. Varistor: Resistance [flow of current] changes as a function of
applied voltage voltage. metal Oxide Varistor: [MOV] See listing above. MOV devices are used in parallel with the load. |
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}
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}
Fuse Holder
Manufacturers; This listing has moved to the
Fuse Holder Manufacturers page.
Circuit Breaker Manufacturers; 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.
Equipment manufacturers may be found by selecting the OEM Equipment icon.
Home | |||||||
Distributors | Components | Equipment | Software | Standards | Buses | Design | Reference |