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.