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Reed Relays

Reed relays are usually semi-conducting devices built out of a permanent magnet and two contacts enclosed in a case or a sealed tube. The two contacts close on each other when the current is passed through the permanent magnet. Generally the reed relays are used for switching purposes. To understand the working principle of a typical reed relay, let us take the case of a HE721C2410 reed relay.

HE721C2410 Application Field

The HE721C2410 reed relay bears a type number T-R-1405-N. It is a double-pole, double-throw (DPDT) type reed relay used for switching applications of 24-V power. It operates at 16V AC/DC with a load power of 200 W at 240V AC/DC. The HE721C2410 device is suitable for use in normal and hazardous environments. The maximum operating temperature of the device is 85 °C at sea level.

HE721C2410 Working Principle

The working principle of the HE721C2410 reed relay is based on a magnetically actuated switch. When electric current passes through a permanent magnet, its magnetic field induces a force on the reeds, thus triggering the contacts of the switch. The reeds open and close depending on the current through the coil, and switch power is sent to the load. The contact totally opens when no current is passed through the coil, and the contacts are closed when the current passes through the coil.

The design of the reed relay has evolved over the years to make it more reliable, with improved coil insulation, better copper wire coils, improved ferrite cores, and enhanced contact material. To improve air gap consistency, the contact tips are coated with gold that enhances the efficiency and switching characteristics of the reed relays.

The HE721C2410 series reed relays are equipped with a rating of 24V DC/16V AC, 2A contact current and 0.2A inductive current, and a maximum breaking power of 200W at 240V AC. The switching speed of the relay is adjustable from 2-1000 ms. The typical operating specifications include a 2A inrush current and 2mA – 10mA coil current.

Conclusion

In conclusion, the HE721C2410 reed relays are smart and reliable devices, providing reliable switching performance in a variety of applications. They are built with a permanent magnet and a coil, and their working principle relies on physically triggering the contact closure by inducing an electromagnetic force on the reeds. This streamlined design allows them to operate at low power and provides faster switching speed.

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