D4B-2171N

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Snap Action, Limit Switches

D4B–2171N snap action limit switches are primarily used in automation, process controls, safety interlock systems and other applications requiring specialized switching or sensing. The switch\'s primary function is to facilitate the automatic start-up or shutdown of equipment or to provide a visual indication when a certain threshold value has been reached.

The D4B–2171N is composed of a plunger mechanism, a contact block, an actuator and an internal spring. When the plunger is pressed or released, the actuator\'s internal spring acts on the contact block, which moves into place and makes an electrical contact. When the plunger is released, the internal spring pushes the contact block back into its original position, breaking the electrical connection and resetting the switch.

The D4B–2171N offers a variety of mounting styles, enclosure styles and electrical ratings. It is available in SPST normally open, SPST normally closed and SPDT arrangement with increased current ratings. A variety of plunger styles offers additional design flexibility.

D4B–2171N snap action limit switches have a variety of applications. They are used to detect the presence or absence of an object or for position, temperature or pressure sensing. They are widely used in industries such as automotive, medical, industrial automation, aircraft and appliance manufacturing.

The D4B–2171N also serves as a safety switch. In this type of application, the switch functions as a circuit breaker or control unit shutdown by limiting the amount of voltage or current that can be applied to a circuit. It can also be used to detect gas pressure and to prevent over-temperature situations in heater circuits and other applications.

D4B–2171N snap action limit switches are designed to provide reliable, long life operation in harsh industrial environments. The contact blocks and actuators are sealed to protect against contaminants, and the snap action contacts are designed for high speed switching. The switches are able to operate over a wide range of temperatures, from -40 to +85 degrees Celsius, and offer a high contact fatigue life.

In conclusion, D4B–2171N snap action limit switches are rugged, reliable components suitable for a variety of applications. Their robust construction, excellent contact integrity and long life make them ideally suited for use in industrial, commercial and residential applications.

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