Standard Fuse Sizes: A Comprehensive Guide
Understanding standard fuse sizes and their applications ensures the safety and efficiency of electrical systems. By choosing the right fuse for your needs, you can prevent potential hazards and maintain the integrity of your circuits.
Table 240.6(A). - ElectricalLicenseRenewal.com
For a great many code cycles, the standard sizes of fuses and fixed-trip circuit breakers used throughout the NEC ® were listed in paragraph form in section 240.6(A). In the 2017 NEC ®, the paragraph was turned into new Table 240.6(A). This is easier to read and just makes sense.
FUSE TYPE MICRO2 ATO® MINI ®MCASE JCASE MAXI MIDI MEGA PAL Series 0 Series 1 Series 2 Series 5 ZCASE ACTUAL FUSE SIZE Black 1A 175A 80A 80A 40A Gray 2A 2A 15A 150A 120A 120A 60A Violet 3A 3A 3A 3A 100A 200A 140A 80A Pink 4A 4A 30A 30A 125A 250A 30A 30A 30A 100A Tan 5A 5A 5A 5A 5A 70A 70A 70A 225A 125A Brown 7.5A 7.5A 7.5A 7.5A 7.5A 70A 25A 150A
Normal operating current. Application voltage (AC or DC) Ambient temperature. Overload current and length of time in which the fuse must open. Maximum available fault current. Pulses, Surge Currents, Inrush Currents, Start-up Currents, and Circuit Transients. Physical size limitations, such as length, diameter, or height.
The fuses in this catalog range in size from the approx. 0402 chip size (.041”L×.020”W×.012”H) up to the 5 AG, also commonly known as a”MIDGET” fuse (13/32” Dia.×11/2” Length). As new products were developed throughout the years, fuse sizes evolved to fill the various electrical circuit protection needs.
Fuses - Types of Fuses - Littelfuse
The largest size fuse shown in the chart is the 5AG, or “MIDGET,” a name adopted from its use by the electrical industry and the National Electrical Code range which normally recognizes fuses of 9/16” x 2” as the smallest standard fuse in use.
UL Fuse Class Chart - Types of Fuses and Fuse Size - Elliott Electric
Use these fuse charts to find the best fuse type given your required fuse overload characteristics, interrupting rating amps, AC voltage rating, and available amps fuse rating. Select a UL fuse class to see fuse characteristics and vendor information for that UL class of fuses.
What Size Fuse Do I Need? Selecting Proper Circuit Protection
2023年8月11日 · The general guideline for selecting an appropriate fuse size is to choose a fuse that is slightly larger than the maximum expected current of the circuit while still providing sufficient protection. Fuses are typically available in standard sizes such as 15A, 20A, 30A, etc.
The maximum fuse size that can be used depends upon the type of cable used and is determined using the appropriate K factor. The following table gives the maximum sizes of fuses that are recommended for two popular cables with copper conductors, 70°C PVC (K = 115) and 90°C thermosetting (K = 143).
Fuse Tutorial | DigiKey
2017年10月3日 · There are no standard fuse sizes; however, there are some that are more common than others. One of the more common sizes for a cylindrical fuse is the 5 mm x 20 mm package size. An example of a fuse with the 5 mm x 20 mm package size is …