Guide to the selection & application of fuses to deliver protection at the right level

Author : Dan Giblin | Product Manager for Circuit Protection | Bel Fuse

01 April 2021

BelFuse_CircuitProtection_0ZCM Series (Group)
BelFuse_CircuitProtection_0ZCM Series (Group)

Although fuses are most associated with safety, and protecting people from high voltages & current, their use isn’t limited to high power. Fuses are also commonly used in products where the components or interfaces need some level of protection.

The full version of this tutorial was originally featured in the April 2021 issue of EPDT magazine [read the digital issue]. Sign up to receive your own copy each month.

Because of this, as Dan Giblin, Product Manager for Circuit Protection at electronic component manufacturer, Bel Fuse explains here, fuses now come in a wide variety of shapes and sizes, as well as materials. At their simplest, they are single-use, based on a sacrificial wire – but many electronics engineers now prefer to use resettable fuses inside products, because they provide protection but rarely need replacing.

This guide answers some of the most frequently asked questions about fuses, including their construction, their limitations and how they operate in specific applications. As outlined above, fuses are perhaps not as simple as they may first seem. Engineers need to be familiar with some of the terms used to specify and select the right fuse for a given purpose and manufacturing process.

Fuse terminology
Application voltage: The fuse’s voltage rating must be equal to or exceed the available voltage supply. Although a fuse is ultimately sensitive to the amount of current flowing through it, the voltage rating relates to the voltage difference that the fuse can reliably withstand, so it must also be equal to or greater than the supply voltage...

Read the full tutorial in EPDT's April 2021 issue...

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