21EN578-12

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Snap Action, Limit Switches

The 21EN578-12 has been designed to enable switch operations with either snap-acting contacts or lever operated roller levers. Mainly used in commercial and industrial applications, these switches typically have a short stroke, rapid response time and high repeatability. Due to the variety of specifications and options for this switch, it can be used on a multitude of different commercial and industrial applications.

Operating Principles

The operating principle and design of the 21EN578-12 switch allows the user to select between snap-action and lever operated contacts. The switch features a nickel-plated brass body that encases a coil spring. As a plunger is pressed by an external force, the springs energy is released and the plunger is activated. This helps the switch to return to its original, un-activated position after the external force has been removed.

The 21EN578-12 is designed with a rating up to 10A/250VAC and it is UL, CSA and VDE listed. It is certified for both high and low temperatures, with an operating temperature range from -25°C to + 60°C. It also has a high shock rating of up to 100g and is IP-67 rated for dust and water ingress protection. The electrical and mechanical life cycles are 10,000 operations, which is more than enough for most applications.

Applications

The 21EN578-12 switch is most commonly found in industrial and commercial applications such as control cabinets, automation systems, HVAC, pumping, communication and security systems, door and window openers, elevators and escalators, access control systems and more. The flexible design and variety of specifications makes this switch suitable for a wide range of applications.

In addition, the 21EN578-12 is suited for a variety of actuator procedures and motion control tasks. This switch is often used in connection with multiple actuators, such as push buttons, limit switches and solenoids, in order to precisely control the motion of a load. Furthermore, it is quite suitable for operating in harsh environments, due to its high shock rating and IP-67 dust and water ingress protection rating.

Conclusion

In conclusion, the 21EN578-12 switch is well suited for both commercial and industrial applications, due to its flexible design and wide range of specifications. Its high shock rating and IP-67 dust and water ingress protection rating make it suitable for operation in harsh environments and its 10,000 life cycle operations are more than enough for most applications. Its ability to work with either snap-acting contacts or lever operated roller levers is what makes it so useful for a variety of applications.

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