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Snap action, limit switches or micro switches are an important family of electromechanical switches. These switches use an internally pivoted actuator, often a small metal blade or metal disc, that snaps from one position to the other when an actuating force applied to it. They are usually the result of an over-center mechanism that stores potential energy when it is moved one way, and is released and snaps to the opposite position on the application of external force.

Snap action, limit switches are widely used in electrical and electronic systems and operations, including off-highway vehicles, electronic locks and robotics. Common applications for snap action switches include motor starters, solenoid valves, remote controls, power tools, lights, and vending machines.

Snap action, limit switches are available in a variety of different configurations, depending on the type of actuator and output that is required. The most common form of snap action, limit switches are single-pole, single-throw, also known as a SPST switch. An SPST switch has two terminals: one is normally open and one is normally closed and is activated when the actuator is released. Other forms of snap action, limit switches include double-pole, single-throw, also known as a DPST switch, double-pole, double-throw, also known as a DPDT switch, and triple-pole, single-throw or triple-pole, double-throw switches.

The working principle of a snap action, limit switch is fairly straightforward. When the actuator is moved, it pushes or pulls a contact or contacts inside the switch. This actuation will then cause the switch to change its operating state.

When the actuator moves away from its active, either open or closed, position, compression springs inside the switch act to hold the contacts in the desired state. A snap action, limit switch will typically have less than 0.01 amp of contact resistance and can handle up to 100 watts of power.

Snap action, limit switches are known for their precise and reliable operation. They are also very reliable in harsh industrial environments and are less likely to fail than other types of switches due to their simple and robust design. They are also relatively inexpensive, making them cost effective for many applications.

In summary, snap action, limit switches are electromechanical switches that are widely used in a variety of applications. They are simple to use and are known for their precise and reliable operation even in harsh industrial environments. They are also relatively inexpensive, making them cost effective for many applications.

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