Kiln relays are found in a kiln’s control box and are responsible for switching the power to your kiln’s elements on and off. That familiar ‘buzz-click’ noise that you hear when you start your electric kiln’s firing cycle comes from a relay being engaged. Relays are different from switches because they are an internal mechanism that works to transfer power to elements. The relay receives a signal from the kiln’s controller, and an electromagnet within the relay is charged. This pulls contacts together, which turns on the kiln’s elements. Like any mechanical part, relays will eventually need to be replaced due to normal wear from the use of your kiln. If a pair of elements will not turn on in a specific region of the kiln, it is possible that the relay responsible for controlling that region needs to be replaced. This can lengthen firing times, cause uneven heating, or will prevent your kiln from reaching the target temperature entirely.

Kiln switches have a very important function: they turn your kiln on and off! Switches are found on manual kilns - those without digital controllers - and over time, you will find that these switches do need occasional replacing. When you are replacing your kiln switch, it is important that you choose the proper switch. Infinite switches, or “stepless” switches, are those switches with variable power output, meaning that you can turn and adjust them in one smooth setting. These differ from “position” switches, which lock into specific positions, such as 3-position switches with low, medium, and high settings. Infinite switches are typically more common, however it will vary between manufacturers and models.