Fuse Breakout Board Hookup Guide
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Considerations When Choosing a Fuse
Choosing a fuse depends on your project. Here are a few considerations when placing a fuse after your power supply or battery.
Project Voltage & Current Requirements
You'll first want a fuse that is able to handle your load's voltage and current. The datasheet for the fuse should provide that information. Then measure the maximum power that the project is expected to pull from your power supply without damaging the circuit. If the project is outputting an excessive amount of heat for a period of time, you may want to take that into account. With the measurements, you'll want to decide the current at which the fuse blows or trips. This value is usually at or below the trip current and within the power suppliy's amperage (i.e. if you want the fuse to trip when part of your load pulls 1A with a 20A high current power supply). Projects that have brief spikes in current (such as robots using motors) would need a slow blow (a.k.a. time-delay). Other projects may require the fuse to be blown out immediately would require a fast or ultrafast. We'll assume that they will be used at room temperature.
Glass Ferrule Fuse or PTC
For high current power supplies, you may want to consider using a glass ferrule fuses that disconnects and blow out in your project. For lower current power supplies, you may want to consider using a resettable fuse. Just keep in mind that the resettable fuses can get hot when tripped and can still leak current to your load.
Stress Testing
Once you have decided on a fuse to use for your prototyping needs, make sure to test it out! Yes, that means sacrificing your glass ferrule fuse but you'll want to ensure that the component works as expected when your circuit starts having a mind of its own.