How To Change a Micro Switch

A micro switch is normally used in an electrical control system for safety circuits. Connection points Normally Open (N.O.), Normally Closed (N.C). and Common are connected to this small switch. The Common point connects the other two connection points to each other. During operation, the switch is activated when the Common point is connected to the N.O. point.

The usual connection that a micro switch needs goes to the side where the N.C. point is located from the terminal of the Common point. Micro switches control when to activate or deactivate a certain circuit. Like any other small device, its durability falters over time and a need for a replacement is sure to arise at one point.

Disable the control circuit where your micro switch is connected. Be sure to do away with every electrical power from it. This prevents the power from shorting to ground that may either damage or completely blow a circuit fuse. Micro switches are commonly used for electrical circuits with low-power and cutting the flow of energy may result to a short.

Take out the ring or spade connectors that aid in facilitating connections. Spade connectors are taken out by loosening the screw a little bit. Pull the spade connector, also called spade terminal, using a small pliers carefully. Ring connectors or terminals require the entire screw to be taken off which is easily done using a screwdriver of the right size. After having the screw removed, use the pliers or simply slip the ring connector off the device.

Mark the leads. The ring or spade connectors are connected to wire leads that connect the points to the switch. Labeling the leads would help in identifying which lead is which. A pencil and a short piece of tape are needed in order to do this. Write the labels N.C. for the Normally Closed point, N.O. for the Normally Open point and COM for the Common point.

The leads are to be attached with a tape showing their corresponding labels. This prevents confusion from arising when the leads are to be attached to the new micro switch.

Remove the screws in the mounting plates using a screwdriver. While a number of screws are detained by a threaded hole located in the plate, alone, others might have small nuts on the flipside of the holding plate that keeps these screws in place. Micro switches normally use two screws for securing the switch in place.

Remove the old switch and install the new one. Make sure that the placement of the new switch is aligned to the metal plate before screwing it tightly. As the plastic of the switch is usually thin do not screw it on too tightly as it may cause breakage, thus damaging the switch. Consider checking the new micro switch for any damage prior to installation.

Connect the wire leads to the corresponding places on the switch. Remember to double check whether the leads are in the right place or not. After installing the new micro switch, check if it works by turning the switch on.

Make sure that you carefully read and understand the process before implementing. Micro Switches are sensitive pieces of technology and simple mistakes can rob them of their efficacy and efficiency.


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