The Circuit Protection Specialists
Phone: 03 9521 6133






Phone: 03 9521 6133
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The Circuit Protection Specialists

Complete Guide to Fuses.

What are fuses?

Fuses (also known as fuse links) are an electrical circuit protection device that is designed to blow when too much current flows through it. When the fuse blows it interrupts the flow of current through the circuit. As you can see below, fuses come in all shapes and sizes. Learn how to identify a fuse.

What do fuses look like?

Fuses are generally constructed with 2 metal end caps that are connected to each other by a metal fuse element which is usually enclosed in an insulated non-combustible housing (body). The fuse body is often made of glass or ceramic. Some fuses are sand filled to improve their performance characteristics. The most common end caps are either round (ferrule), metal blades or metal tags.

Picture of a ferrule fuse
Picture of a blade fuse
Picture of a tag fuse

What are the different types of fuses?

Fuses are generally grouped by the following categories; Resettable Fuses (PTC's), Miniature Fuses, Automotive Fuses, Solar (PV) Fuses, Ultra Rapid (semiconductor protection) Fuses, Industrial Fuses and Medium/High Voltage Fuses as shown below.

Resettable fuses work like circuit breakers in electronic circuits. They automatically reset when the fault current is removed.
Fuses designed for printed circuit boards and small cartridge fuses. Types include T & F.
Fuses commonly used in automotive applications such as cars, trucks, buses, motorcycles, forklifts and low voltage DC applications.
Fuses and surge protection devices designed to protect photovoltaic systems. Types include gPV & PV.
Super Rapid or Very Fast Acting fuses designed to protect sensitive semiconductor components. Types include aR, gR & gS.
Fuses designed to protect industrial machines, wiring and power systems rated 250V or more. Types include: gG, gL & aM.
Fuses designed to protect medium to high voltage equipment rated 1000V or more.

Who makes fuses?

There are hundreds of companies manufacturing fuses around the world. When buying a fuse, we HIGHLY recommend you only buy fuses manufactured by a reputable brand to ensure your circuit is adequately protected thereby avoiding damage, fire and harm. Swe-Check only sell quality fuses from globally recognised manufacturers that are made and tested in accordance with international standards and approvals. We do not sell cheap copies or imitations. We stock globally recognised brands including:


How do I find the right fuse?

Finding the right fuse can be a difficult process. Firstly you need to be able to understand all the markings shown on the original fuse so you can be sure you buy the correct replacement fuse eg. accidentally replacing an ultra rapid fuse with a slow acting fuse can cause damage to your equipment or worse. If you need help to find the right fuse, please contact our staff, they have years of experience and are happy to help. We have also added a range of search tools to this website to help:

How do I test fuses?

Fuse manufacturers have the equipment required to test the element speed and interrupting rating of a fuse in different situations. The results of these tests are commonly included in their product literature in the form of time current curves and interrupting ratings etc. However, should you need to test if a fuse is blown, you can easily do this using a multimeter set on the Ohms range.

Where can I buy fuses?

Swe-Check specialise have been selling fuses for over 30 years. We stock THOUSANDS of fuses to suit nearly every application. If you are unable to find a specific fuse on our website, please contact us, we have can often supply the exact fuse or a direct equivalent from a different manufacturer.

  • You can purchase online or by phone, fax or email or over the counter.
  • Our friendly sales staff are happy to assist by phone, fax or email.
  • We accept all major credit cards, eft or cash payments.
  • We offer express shipping on Australian orders and also accept international orders.
  • We offer special pricing to manufacturers, wholesalers and trade customers. Please contact our staff for a quote.
  • Credit accounts available to customers with ongoing fuse requriements
Customer Feedback

" I received my order yesterday arvo and they more than met my expectations. I just finished installing the fuse blocks into the system and they look very professional and fit for purpose. Thank you for the prompt delivery and your excellent customer service. "

Russell A
Received 11/1/18

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