A solenoid switch uses a small amount of energy to create a magnetic field that connects to a larger power source. It has a metal coil, rod, and connectors, and is commonly found in automobiles. When energized, the magnetic field pushes the rod to create a loop and allow power flow. Solenoid switches are reliable and unlikely to fail, with corrosion being the most common reason for failure.
A solenoid switch is a device that uses a small amount of energy to create a magnetic field which will then create a connection to a much larger power source. Typically, these devices are contained in a cylindrical metal housing that covers a metal coil, a metal rod, and four or more electrical connectors. These switches are extremely common inside automobiles and devices with similar engines. In a car, a solenoid switch will take the connection made when you turn the key and use it to connect the larger, more powerful car battery to the car’s electrical system.
Most solenoid switches share a basic design. A metal coil is used to create a stable and predictable magnetic field when a small amount of current passes through it. This essentially turns the coil into a finely tuned electromagnet. Generally, a pair of connectors are attached to both ends of the coil, which are connected to a low power source.
Inside the coil, the solenoid switch has a magnetic metal rod that is held tightly but loose enough to slide back and forth inside the coil. When the coil is energized, the magnetic field pushes the rod up to one end of the coil. This is where the second set of connectors are located. When the rod is in place, it creates a loop with the heavier connections and lets the power flow through the system. The whole is then enclosed in a metal casing to reduce corrosion and protect the plant and its operators.
While a solenoid switch can be found in a number of items, it is by far the most common in the starting system of modern automobiles. These systems generally use the same basic switch design. The circuit created by the ignition system when you turn the key is connected to the coils. This charges the coils and makes a heavy connection to the car battery. Battery power provides the electricity to start the car.
These breakers are very predictable and reliable which is why they are used so heavily. Since the solenoid switch contains no real electrical or mechanical parts, the system is very unlikely to fail. As long as the outer casing remains intact, the inner workings will remain dry and continue to function for a very long time. Typically, the most common reason for a solenoid switch to fail is corrosion on the connectors that migrates from the outside to the inside.
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