21EN9-15

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Snap Action, Limit Switches are electromechanical devices that detect the position or presence of an object. The 21EN9-15 belongs to this category and is an economical, general purpose, normally open, single-pole double-throw pushbutton. It is widely used in a variety of applications because of its simplicity and reliability.

The 21EN9-15 is available in three different forms: momentary, maintained and alternate action. The momentary form is also referred to as "momentary on/momentary off" and is used with pushers, switches and limit switches. The momentary-on form has a single pole double throw (SPDT) configuration with a metal stud and spring mounted plunger that extends out of the actuator body. When the plunger is pressed it makes contact between the two poles and creates a circuit. When the plunger is released, the contact is broken, and the circuit is broken. The maintained form of the switch is used for actuation of a light for a specific period of time.

The register limit switch is used to set a limit or boundary on a machine, for example, the rotary limit switch can be used to control the number of rotations or revolutions a machine or device can make or the linear limit switch can be used to determine the travel of a device. The normally closed limit switch of the 21EN9-15 is used to control the forward and reverse direction of an electric motor in the circuits.

The working principle of the 21EN9-15 is based on a simple design. It consists of a metal contact body with an internal spring that allows the switch to move freely. A pushbutton or switch is used to actuate the switch when it needs to be triggered. When the button is pressed, the metal contact body is pushed in, forcing the metal arm to engage the metal contact and create a circuit. When the button is released, the metal contact body returns to its original position and the metal arm disengages the metal contact and breaks the circuit.

The 21EN9-15 switch is highly versatile and is ideal for applications such as homing and positioning applications. It can also be used for programmable logic controllers (PLC) for safety circuits, machine control and limit positioning. It is also suitable for operating alarms, annunciators, warning systems, sounders and horns. The 21EN9-15 is very reliable and is designed for a long service life in harsh environments. It is also resistant to water and vibration.

The 21EN9-15 is a cost-effective, general purpose pushbutton switch that is suitable for a wide range of applications. It is reliable, robust and easy to operate. It is also resistant to water and vibration, making it perfect for harsh environments. With its SPDT configuration and metal contact body, it is the ideal choice for a range of operational, safety and position control applications.

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