D4A-3109N

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The D4A-3109N is a type of snap action limit switch. Such switches convert the physical motion of an actuator into an electrical signal. This type is a single pole double throw (SPDT) alternative action model with large bellows, making it suitable for many applications.

Defining a Snap Action Limit Switch

A snap action limit switch is a type of switch that utilises a form of mechanism called \'over center action\'. The name derives from the physical snapping action that is created when the actuator lever is moved past its centre point. This type of switch operates at high speed and is designed for use in situations requiring instant response and reliable actuation, commonly found in industrial applications. The D4A-3109N is mainly used in automation, industrial machinery, computers, and consumer electronics.

Characteristics of the D4A-3109N

The D4A-3109N features a large bellows design, with an adjustable operating angle that can be set to between 20 and 70 degrees. It has a rated operating force of 5.0N, a rated voltage range of 12-240V AC/DC, and flush mounted Terminal Blocks for ease of installation. The switch is robust, with a maximum electrical life of 200,000 cycles and an IP67 rated water and dust resistance – making it suitable for harsh environments.

The D4A-3109N also has a wide range of contact block and housing options, allowing for flexible configuration. The contact blocks are available in normally open (N.O) or normally closed (N.C) form and the housing is interchangeable between an open frame, a metallic frame and a plastic frame.

Working Principle of the D4A-3109N

When the actuator lever of the switch is moved, the force of the actuation causes the movable contacts of the switch to travel relative to the surface on which they are mounted. As the surface is a curved bellows, the amount of force required to actuate the switch is rectangularly varying and is greatly reduced when the lever passes its centre point. This is what gives the switch its \'snap action\' effect, as the lever snaps to whichever side of the centre point it is actuated to.

When the movable contacts reach the power lifter, the contacts are separated from their terminal blocks and the electrical circuit is disconnected. This disconnection is what causes the switch to actuate, making the switch\'s operating principle very simple and straightforward.

Conclusion

The D4A-3109N is a type of single pole double throw (SPDT) alternative action limit switch that can be used in a wide range of applications. Its large bellows design and adjustable operating angle allow for easy installation and reliable actuation, while its electrical life, water and dust resistance make it suitable for harsh environments. Understanding the working principle of this switch reveals the simplicity of its operation, making it a great choice for any application requiring a reliable, reliable switch.

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