83272013

Snap Action, Limit Switches

A snap action, limit switch is an electro-mechanical device that is widely used in industrial applications as a control component. It comprises of a switch, actuator and body, and is available in a variety of configurations. It is typically used to detect the presence of an object within its sensing range, either in a closed loop or an open loop configuration.

A limit switch usually contains a reed switch, with an electro-mechanical contact inside a leak-proof enclosure. The contact is connected to an actuator which moves when an object is detected within its sensing range. The actuator is connected to a lever arm that is connected to a switch closure mechanism, which triggers a switch state change when an object is detected. On detection, the switch can be configured to open or close the circuit, paving way for electrical control of the process.

A snap action, limit switch is designed to detect the presence of an object within its sensing range with a fast response time. This is enabled by its fast mechanical action which eliminates bouncing contacts and ensures reliable control. Furthermore, the limit switch\'s design ensures that the contact closure remains in place until the contact returns to its mechanical rest position, thus ensuring the process remains under control at all times.

The limit switch is used in a variety of applications, ranging from material handling and food processing, to HVAC, automotive, and utility applications. When used in material handling and food processing applications, the switch is used to detect the presence of an object, whilst in automotive and utility applications they are typically used to control the speed and direction of a process or machine. In HVAC systems, these switches are used to manage air conditioning and heating systems.

A snap action, limit switch is usually mounted on the lower part of a surface or in a panel or control box. The mounting position must be such that the actuator can detect the presence of an object within its sensing range. Furthermore, the limit switch should be fitted and calibrated at a location to ensure that it does not encounter excessive vibration or shock during its operation. Lastly, the switch should be regularly checked for dirt and dust accumulation, as this can affect its operations.

In summary, the snap action, limit switch is an electro-mechanical device that is widely used in industrial applications as a control component. It is typically used to detect the presence of an object within its sensing range, either in a closed loop or an open loop configuration. It comes with a fast mechanical action which eliminates bouncing contacts and ensures reliable control and is used in a variety of applications, ranging from HVAC to automotive and utility applications. Its mounting position and calibration should be such that it is not affected by shock and vibration, as this can adversely affect its operations.