D4N-8A22

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Snap action limit switches are designed to open or close with precise repeatable action in response to movement in the actuating arm or plunger. An oscillation in the actuating force will cause the switch contacts to open or close, either all of the way, or for a short travel. D4N-8A22 is a kind of snap action limiting switch and its application field and working principle will be introduced in this article.

The applications of this snap action limit switch are very wide: it can be used in measuring and controlling temperature, such as in temperature controller; in a variety of industrial machines, such as conveyor machines, photoelectric switches, and robot applications; or in residential appliances, such as washing machine, refrigerators, ovens, and air conditioners. In addition, it can be used in different kinds of motors, automation machines and remote control sensor.

D4N-8A22 snap action limit switch is suitable for all types of wide voltage power supplies. It is adopted with conversion circuit, so it can be used in AC, DC, low voltage and high voltage. It has high repeatability, superior transient response and the switch can detect any instantaneous change of the load, suitable in harsh working environment. Its repeat accuracy is less than 1 micro meter and the response time is less than 0.5 milliseconds. Its temperature range is -20℃-85℃ and humidity 20%-95%.

D4N-8A22 snap action limit switch mainly has 4 parts. The contact part is the core component of the switch, which is made of high quality material, excellent electrical and heat resistivity, corrosion resistance and anti-interference performance. The case is made of plastic material and provides protection to the electrical components and circuit. The actuator is the part that will be moved in the case. When the set point is reached, the actuator will be turned off or on and it also can be customized in different shapes to meet different customers’ requirement. The electrical connection port is installed in the lower part of the switch, which is actually the wires that transmit the current.

The working principle of D4N-8A22 snap action limit switch is that when the actuator is pushed to the certain direction, the contact part will close the electric circuit, make the power connection, then the switch will on. And when the actuator is pushed to another direction, the contact part will be opened and the circuit is break, then the switch will off. The springs inside the limit switch will provide the force that make the limit switch return to the original position when the actuator is released. Due to the design of springs, the actuator will be stopped when the set point is reached, so the repeated operation is available and controller the switch on or off.

In conclusion, D4N-8A22 snap action limit switch is widely applied into many areas with its wide applications, including temperature controller, industrial machines, residential appliances, motors, automation machines, etc. Its main components are contact part, case, actuator and electrical connection port. Its working principle is that when the actuator is pushed to the certain direction, the contact part will close the circuit, then the switch will on; when the actuator is pushed to another direction, the contact part will be opened and the circuit is break, then the switch will off. The repeative operation is available due to the design of springs.

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