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Snap Action & Limit Switches

Snap Action switches and limit switches are electromechanical devices that detect when an object, part or system has been activated or motion has been exceeded. These devices are commonly used in applications such as mechanical devices that require a specific limit to be reached without the need for a user to continuously monitor. Snap action and limit switches are also known as limit detectors, limit switches, and proximity detectors.

The working principle of a snap action switch and a limit switch is the same. Both rely on electrical signals to detect when an operation limit has been reached or exceeded. When the switch is activated, the contact points are moved, causing a change of state such as an open or closed circuit. The switch can then send a signal to a controller, indicating that a limit has been reached.

A snap action switch is advantageous for operations that require reliable actuation even under repeated motion or wear, such as a garage door or automated production system. It is particularly used in applications where the contact points are exposed to shock, vibration, corrosion and other environmental degradation. The operation is initiated when a metal sliding contact or a plunger moves from its natural or rest position and depresses the switch. It can be actuated with either a quick snap or slower motion. This device is often used for simple ON/OFF applications as it provides reliable operation over long life.

A limit switch is used to detect when a machine or system has exceeded a certain physical boundary or limit. It usually consists of a contact arm and a contact. limit switches can be used in a variety of applications such as automated production systems and mechanical devices requiring the detection of a physical limit. Limit switches are designed to detect a mechanically induced event, such as the physical position of an object or a contact point, and indicate the same to a controller. Limit switches are designed to work under harsh environment, but they are not suitable for applications that require repeatability and exact measurement.

Snap action and limit switches vary in design, size and features. These devices can be classified into types based on the type of mounting, the type of contact mechanism employed, the switch construction and the electrical ratings. Some of the common types of snap action and limit switches include toggle switches, rocker switches, pushbutton switches, roller lever switches, single and double pole switches, special purpose switches and reed switches.

Snap action and limit switches are used in many industries including medicine, automotive, security, industrial control, and others. They are used to detect changes in pressure, acceleration and torque in machines, control position-sensing of actuators, and trigger alarms and monitoring systems. Snap action and limit switches are widely used in operating a variety of home and industrial appliances, including thermostats, relays, circuit breakers, automatic doors, electrically-operated valves, and robot arms.

In conclusion, snap action and limit switches are electromechanical devices that detect when an operation limit has been reached or exceeded. They are commonly used in applications such as mechanical devices and electrical systems. Different types of snap action and limit switches are available to suit a wide variety of applications. These switches are designed to work under harsh environments, and they are especially useful for operations that require reliable actuation, even under repeated motion or wear.

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