21SM366

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Snap Action, Limit Switches

The 21SM366, or the 21 Series Electronic Limit Switch, is a two-piece snap action switch consisting of a plunger (or actuator) and a body. The switch is designed for use in applications where reliable and accurate switching is paramount. The 21SM series is a micro switch version, offering a smaller size compared to the 21 series standard switches.

The switch is widely used in electronic and electrical equipment such as industrial machinery, information systems, appliances and aircraft. Its typical application fields include: power supplies, air conditioning and fan control, automotive, security and fire protection lighting, traffic control and medical equipment.

The switch’s working principle is as follows; actuator is mechanically connected to a plunger and contacts which provide two-way switching signals. When the switch is pressed, the plunger is pushed downwards and the contacts close, while when the switch is released, they open again. The contact force is adjustable and the plunger can be made of various materials such as plastic, metal or ceramic.

The 21SM366 is capable of carrying up to 2A and offers a wide range of operating after travel, which is the amount of gap between the plunger and contacts when the switch is open or closed. The switch’s body is mostly constructed from plastic and is available in a variety of colors.

The 21SM366 is a reliable, versatile switch that is widely used in many different applications. Its compact size and adjustable contact force make it well-suited for areas where power and space are at a premium. In addition, its durability and long life-span make it a cost-effective solution for harsh environments.

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