Momentary Switch Replacement

はじめに

Momentary switches are commonly used in electrical circuits to provide momentary contact, which means that they only make contact when they're pressed or held down. Over time, these switches can become damaged or worn out, resulting in poor or non-existent electrical connections. If you're experiencing issues with your momentary switch, it may be time to replace it.

It's important to note that this guide involves working with electrical wiring, which can be extremely dangerous if not handled properly. If you're not comfortable working with electrical wiring, or if you're unsure about any aspect of the process, we strongly recommend that you seek the assistance of a qualified electrician.

Assuming you're confident and capable of working with electrical wiring, this guide will walk you through the steps of replacing a momentary switch, including how to safely disconnect the power supply, removing the old switch, and installing the new one. It's important to remember that electrical work should always be approached with caution, so make sure to follow the instructions carefully and double-check your work at every stage of the process.

必要な工具と部品

手順1 Turn off power

Momentary Switch Replacement, Turn off power: 手順 1、 3の画像 1

Momentary Switch Replacement, Turn off power: 手順 1、 3の画像 2

Momentary Switch Replacement, Turn off power: 手順 1、 3の画像 3

Find your Breaker Panel.
Identify the breaker to turn off.
There'll typically be a table listing the rooms corresponding to breakers.
Turn off the breaker.

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手順2 Check that the power is off

Press the switch to ensure that the power is actually off (p. ex. the lights don't turn on).

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手順3 Remove the old switch cover

Momentary Switch Replacement, Remove the old switch cover: 手順 3、 3の画像 1

Momentary Switch Replacement, Remove the old switch cover: 手順 3、 3の画像 2

Momentary Switch Replacement, Remove the old switch cover: 手順 3、 3の画像 3

Remove the switch cover by jamming a flat head screwdriver, into the gap between the outer frame and the switch cover.
Some manufacturers, like Busch-Jaeger have an extra frame beneath the switch cover, so you'll have to remove that as well.
Remove the frame
If you can't remove the frame because there's a wall socket on the same frame, take a look at this guide, on how to remove the cover of a wall outlet.

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手順4 Remove the old switch

Momentary Switch Replacement, Remove the old switch: 手順 4、 1の画像 1

Loosen the holding claws by turning the two screws.
If your switch is mounted inside a cavity wall box you can remove it by loosening the two screws around the perimeter and turning the switch until the two keyholes line up.

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手順5 Determine voltage absence

Momentary Switch Replacement, Determine voltage absence: 手順 5、 2の画像 1

Momentary Switch Replacement, Determine voltage absence: 手順 5、 2の画像 2

Use a Duspol or any other Voltmeter to test if there is voltage at the contacts.
You can also use a single pole phase tester, but that's not the proper way to do it.
Do not work on live circuits if you are not an experienced professional.

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手順6 Disconnect the wires

Momentary Switch Replacement, Disconnect the wires: 手順 6、 1の画像 1

Disconnect the wires form the old switch.
If the old switch has Push-In contacts, you can unlock the terminals by pushing down on the plastic levers.
If you short Earth to Neutral you'll trigger your GFCI/RCD, even if the power is off.