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Plug Fuses and Cartridge Fuses


Plug and cartridge fuses come in many shapes and sizes. There are the older screw in fuses that were a menace, simply because you could screw a 20 or 30-amp fuse into a 15-amp socket. The newer style is an Edison-based socket that only allows you to screw the appropriate sized fuse in the socket in order to make the connection. The man fuses and fuses rated over 30 amps will require cartridge fuse. These vary in physical size and are cylindrical in shape.

1. Plug Fuses:

Plug Fuses
Photo: Timothy Thiele

Plug fuses come in a screw-type configuration. They come with a sight glass that shows if the fuse is blown or not. The older type fuses have a brass screw thread on the side and a center contact point. The newer style, Edison-based, have a plastic thread with a spring-type contact and a center contact. The Edison-type base has an advantage over the older style. It only allows the appropriate sized fuse to be installed, unlike the old style that you could actually install a 30-amp fuse in a 15-amp socket.

2. Plug Fuse Articles:

Plug Fuse Test
Photo: Timothy Thiele

Testing Plug Fuses

When a plug fuse blows and you need to find out if in fact it is bad, testing plug fuses with a multi-meter is the way to go.

What are Screw-in Plug Fuses, Tamper-proof Fuses, and Fuse Adapters?

Learn what plug fuses, tamper-proof fuses, and fuse adapters are and what they look like.

3. Cartridge Fuses:

Cartridge fuses are cylindrical in shape and have the contact points at either end. These fuses are used in fuse panels and disconnects for amperages over 30 amps.

What is a Cartridge Fuse?

Learn what a cartridge fuse is and what applications they are suitable for.

How To Test Cartridge Fuses

Learn how to test cartridge fuses to find out if they are blown.

Service Panels and Distribution

Here's a good look at service panels, distribution, circuit breakers and fuses in your home. See how the power flows in to your home from the utility company's connection point to the panels in your home, to the devices that you plug things in to. How well do you know your power grid in your home?

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