Fuses Everywhere – Every Day
Littelfuse ATO-30-LED

Have you ever considered how much your everyday life depends on the use of various fuses and diode arrays to protect against the effects of electrostatic discharge? Let’s face it – protection against the effects of electrostatic discharge is an essential requirement for any manufacture, home construction, service, repair and any other area in contact with electronic boards and components.


In this video, created by the well-known industrial technology company, Littelfuse, you’ll see how fuses are used every day, and everywhere. National Fuse is pleased to be a licensed distributor of Littelfuse products.

Consider the various devices you use each day:

  • Cell phones – Cell phones utilize fuses to protect with polymer ESD suppressors diode arrays. Diode arrays provide protection against electrostatic discharge and electromagnetic Interference.
  • Coffee machines – Coffee machines use diode arrays and fuses to protect against electrostatic discharge and a reed switch and sensor to control voltage flow.
  • Wearable devices – Devices such as a FitBit use diode arrays, surface mount fuses, resettable PTC fuses which protect against overcurrent.
  • Refrigerators – Refrigerators have NTC thermistors which provide decreasing resistance with increasing temperature and PTC thermistors which provide increasing resistance with increasing temperature.
  • Dishwashers – Ever wonder how dishwashers know when to change cycles? They utilize a float switch which senses the liquid level to operate a switch.
  • Microwave – Many people use a microwave at least once a day. Microwaves contain PICO fuses (which are made by Littlefuse). A Pico fuse protects the head unit in the case of a bad ground connection.
  • Laptops – Your laptop contains diode arrays surface mount fuses to protect against overcurrent.
  • Printers – Your printer contains radial level varistors (MOVs) – a form of transient voltage surge suppressor used to protect circuit board components.
Arc Flash Seminars Now Available Nationwide via Zoom!

National Fuse sponsors ARC Flash Seminars throughout the year in order for individuals to get the OSHA-required certification. Due to COVID, we are now offering attendance via Zoom.


Interested in getting certified? Click here for more information on our next seminar and to view the full seminar flyer. The instructor Jack Bene is a licensed National Electrical Codes (NEC) Instructor and has completed over 150 flash studies for commercial and industrial facilities. In addition, Jack has trained several hundred companies on arc flash hazards, shock and electrocution hazards, grounding, over current protection and general national electrical code topics.


The new National Fire Protection Association (NFPA) 70E-2021 110.5 (3) regulation reads “additional training and retraining in safety-related work practices and applicable changes in this standard shall be performed at intervals not to exceed 3 years.” A course completion certificate will be provided which establishes your compliance of the NFPA 70E training/retraining protocols.


Who should attend: contractors, electricians, engineers, technicians, safety personnel, and plant managers.  Groups or company-wide scheduling are also welcome. To register contact either Mark or Angie at 1-800-328-0496.  Zoom link & credentials will be forwarded upon registration.

“Stay Safe” from Arc Flash
Fluke CV401

This past year has been one of major adjustments for us all in work and lifestyle due to the COVID virus. In place of using “best regards” as a standard closure to email communications, the norm has now become “stay safe.” In addition, we have all taken precaution by social distancing and wearing facial masks while out in public.


Staying safe in the workplace with large electrical and industrial control panels, requires its own “protection mask”. Every time you open a panel cover, you expose yourself to the potential dangers of arc flash. A newer and proven protection method of live electrical equipment inspection is infrared thermography offered by the Fluke ClirVu® IR Window. Once a ClirVu® IR Window is installed, there’s no longer a need to power down or remove panels. Inspections are conducted quickly, easily, and most importantly, safely.


National Fuse Products offers the Fluke ClirVu® CV300 75 mm (3 in) Infrared Window. It’s a great time to order since it’s at the new featured product sale price of $328.98 for a limited time! You can find more information about the ClirVu CV300 below.

Your Peace of Mind | 2020 NEC Revision

How much is your peace of mind worth to know that you are protecting your home from unseen, dangerous electrical surges in addition to complying with the latest National Electric Code (NEC)? Power surges are an issue because they can damage or destroy plugged-in electrical devices. When too much electricity flows through an appliance at once, the appliance could overheat, break down, or even catch fire.


The NEC is updated every 3 years. The 2020 NEC revision contains a few revolutionary changes for surge protective devices as shown in the video below.



The Mersen® Surge-Trap® Series Surge Protection Device (SPD) safeguards whole house appliances and electronics, including residential air conditioning and furnace units from costly voltage surge events, such as fluctuations in power often generated from inside a home or building, or from an outside source like lightening.


National Fuse Products is a licensed distributor of Mersen® products and highly recommends the Mersen® Surge-Trap® Series SPD for whole house surge protection. For less than $90 for this device, you can now have that peace of mind you are not only protecting your home from a destructive electrical surge event, but also complying with the latest NEC requirements. This device also carries a 3-year warranty. For further information, please visit our product page.


Be Safe Using a Ground Fault Circuit Interrupter
ground fault circuit interrupter

Have you ever considered which is more important – your job or your safety performing the job? You guessed it – your safety is most important. The National Safety Council established June as national safety month. National Fuse Products thought it would be a perfect time to feature one of the more popular circuit interrupters at a sale price of $48.97 (originally $85.70). The Ericson XG2-12-2TT is a portable ground-fault circuit interrupter (GFCI) required by OSHA to be used by all maintenance people in factory environments. For further information or to purchase this item, please visit our Ericson XG2-12-2TT product page.

OSHA Required Insulating Gloves
Cementex Insulating Gloves

Insulating gloves are critical PPE (personal protective equipment) for electrical work on or near exposed energized parts. Insulating gloves must be rated for the voltage to which a worker will be exposed (phase to ground or phase to phase) and marked to indicate their rating. OSHA requires that the gloves must be electrically tested at regular intervals of not more than 6 months. If gloves are not used for one year and are still in the box or bag they must to be sent out for testing after one year. The gloves are then date stamped and the clock starts ticking again. If an employee is found to be using out-of-date gloves, OSHA may issue a fine of up to $500 to the company. National Fuse Products carries a variety of Cementex protective equipment which can be found on our Cementex product page.

Mersen Solutions for the Wind Industry

Ever wondered how those wind turbines operate efficiently? Mersen, a global expert in electrical power, protection and control, gives you a glance at the improvements that can be made to continuously improve wind turbine component performance and reliability. National Fuse Products is a licensed distributor of Mersen products.

What does the “T” and “F” stand for when it comes to fuses?
What the T stands for in fuses

Ever wonder what the “T” stands for when it comes to fuses? If you answered “Timed” – you are correct! Timed is the correct term for a “slow blow fuse” which are often called “time-delay fuses.” There is also a double “TT” rating which denotes very slow blow fuses. Alternatively, “F” stands for “Fast” or “fast acting fuses” with the “FF” rating for ultra-rapid fuses such as the one shown here. The ultra-rapid fuses operate at higher temperatures so are ideal to provide circuit protection to semiconductor devices. The fast-acting fuses are ideal to protect less sensitive components.

A Fuse Is Tripped By Heat, Not Current
fuse tripped by heat

A fuse is not tripped directly by current but rather the current creates heat, and heat trips the fuse. This is known as the “heating effect of electric current.” The amount of heat produced by the flow of current through a fuse wire depends on the following factors: 1-Material of the wire 2-Thickness of wire 3-Length of wire and 4-Amount of current flow. The heat produced due to the high current quickly melts the fuse wire and breaks the circuit. Thus, the flow of current stops and the damage is avoided. Many companies invest in the use of thermography devices to identify heating issues before an electrical failure occurs.

Fuse vs. Circuit Breaker
fuse vs. circuit breaker

Ever wonder who would win if there was a contest between a fuse and a circuit breaker? When everything is considered – purchase price, maintenance cost, foreseeable service life – a fuse proves to be the winner. Fuses also win out in the maintenance department – where circuit breakers must be checked regularly to make sure contacts are operating properly, a fuses stable nature requires no work at all. National Fuse Products is a leading distributor of North American fuses, European fuses and Japanese fuses. If we don’t have the fuse you’re looking for, we’ll get it for you at a very competitive price.