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Don't Blow It...Safety First! - July 2022


If fuses in your components (i.e. amplifiers) need to be replaced, they must ONLY be replaced with the exact rated value and type. Slo-blow fuses should never be used unless the product specifically requires their use. The use of either higher values or the inappropriate use of slo-blows risks further damage to the product, potential fire and potential damage to your bodily organs.

Let's deep dive on fuses a bit further. The reason slo-blow fuses exist is that the circuitry has an initial higher draw at turn on only and not during normal use. Therefore, the slo-blow is designed (and there are different ratings even here for the amount of time it will handle the draw surge) to deal with that. Quick blows are just that! If you exceed the draw level at any time, it burns. Over the past 20 years or so, you may have noticed that you don't see glass fuses but, rather, ceramic ones that you can not visually check. The reason for this is that the EEOC required the use of ceramic fuses to prevent the sparking burn of a glass fuse from cracking the container resulting in an uncontrolled spark inside the product and the potential for a fire. The only way to check ceramic fuses is to pull them from the circuit (the product being unplugged) and using a multimeter to check for continuity. If your product has a ceramic fuse, that's what must be used. Actually, it's not a bad thing to replace glass fuses with ceramic ones as a matter of safety. It's not required to do so, but it is a good practice.

One final point: If you suspect an issue with your component, just keep it simple by calling or emailing us! Lou

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