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Reed relays are electromechanical relays which use a coil to activate a reed switch in order to switch a circuit. Reed relays are durable and long lasting, making them an ideal choice for applications requiring reliable performance. Due to their small size, reed relays can be used in space and weight-constrained applications. It is also relatively cheap compared to other types of relays, making it an attractive option for many applications.

DAR71210TU Application Field and Working Principle

The DAR71210TU reed relay is a single-pole, double-throw (SPDT) device, which can be used for switching both NO (normally open) and NC (normally closed) contacts. It has a high insulation resistance and can be used in both AC and DC circuits. The physical size of the DAR71210TU is 12.2mm x 5.5mm x 5.1mm, making it suitable for a wide range of applications. In addition, it can be used at temperatures ranging from -40°C to +100°C.

The working principle of the DAR71210TU is based on electromagnetic reactance. When a voltage is applied to the coil, it creates a magnetic field that acts on the reed switch. This closes the contacts, activating the relay. The reed switch will remain in this state until the voltage is removed, at which point the contacts open again and the reed switch returns to its normal position. The contacts will remain closed as long as the voltage is applied to the coil.

The DAR71210TU can be used in a wide variety of applications, including switching both AC and DC circuits. It is also often used as a protective device in industrial control circuits. The reed relay can be used in alarm and security systems, as well as in telecommunications equipment. In addition, the reed relay is often used in some medical equipment, such as X-ray machines, due to its high insulation resistance and small size.

Advantages of Reed Relays

Reed relays offer a number of advantages compared to other types of relays. The smaller size of the reed relay allows for more compact packaging and saves valuable space in many applications. In addition, reed relays are also very reliable and long lasting, requiring minimal maintenance. They are also capable of switching large currents and voltages, making them ideal for applications requiring high-power switching. Finally, reed relays are relatively cheap compared to other types, making them an attractive option for many applications.

Disadvantages of Reed Relays

The main disadvantages of reed relays are their slower switching times and their susceptibility to sun-induced breakdown. In addition, they possess a lower thermal resistance capacity than other types of relays. This means that they may need to be de-rated for applications requiring long-term or high-current operation. Finally, reed relays are more susceptible to becoming magnetized, which can lead to incorrect operation if the reed switch is exposed to strong fields or high temperatures.

Conclusion

Reed relays are an attractive option for many applications due to their small size, low cost, and high reliability. The DAR71210TU reed relay is a single-pole, double-throw device which is suitable for switching both AC and DC circuits. It is especially useful in space and weight-constrained applications. However, there are some drawbacks to using reed relays, including slower switching times, reduced thermal resistance, and susceptibility to magnetization. Despite these drawbacks, reed relays remain a popular choice for many applications.

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