83269023

Snap Action, Limit Switches

Snap action switches, also known as limit switches, are multi-functional electromechanical switches that are typically used in circuits to detect the state of a mechanical part or the motion of a switch actuator. Snap action switches have been around for decades and have been used in applications ranging from controlling manufacturing automation robots to domestic appliances. Snap action switches have seen a resurgence in popularity in recent years with the advances in electrical and electronics technologies, which have allowed for the development of higher-accuracy, longer-life snap action switches.

83269023 Application Field and Working Principle

Snap action switches are widely used in a variety of applications due to their broad range of shapes, sizes and switch configurations. These switches can be found in everything from home appliances and commercial HVAC systems to industrial equipment in manufacturing and automated processes. The most common application for snap action switches is in motor control systems, as they are robust enough to handle the high voltages and currents associated with motors.

Snap action switches work by detecting changes in position or force. For example, in a simple push-button momentary switch, when a button is pushed, the contact arms move, triggering the actuator and activating the switch. In a more complex application such as a proximity switch, the switch is triggered when a target object comes within a set distance of the actuator. In both cases, the switch is "snap described" as it is opened or closed quickly by the movement of contact arms.

Snap action switches can be further divided into two main types: reed switches and mercury switches. Reed switches consist of a pair of magnetically sensitive reeds that move in response to changes in magnetic flux. Mercury switches are slightly different in that they contain a viscous mercury compound that deforms in response to changes in temperature. Each type of snap action switch has different levels of suitability for different applications, depending on the type of environment they are operating in and the contacts being used.

Another important variable to consider when selecting the type of snap action switch to use is the way the switch will be triggered. For example, some switches feature what is known as a “gate” mechanism, which is used to latch the switch open or closed in order to verify a precise answer. These switches are commonly found on vending machines, as they ensure that products are always dispensed correctly.

Since snap action switches are so versatile, they play an important role in a wide range of applications. From vending machines to motor control systems, these hardworking switches are relied upon to ensure that electrical systems and equipment run safely, efficiently and reliably.