HE721A2420

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Reed Relays: HE721A2420 Application Field and Working Principle

Reed relays are usually used in the application of automatic control systems, electrical and electronic circuits, telecommunication and signal processing. The specially designed HE721A2420 reed relay from American Zettler is a small and compact negative input reed relay widely used for industrial and monitoring applications. Different from the traditional reed relays, HE721A2420 reed relays have a built-in pick-up protection and low parasitics inductivel.

Application Field

The HE721A2420 reed relay is used in many fields such as home and industrial automation, telecommunication, household appliance, automotive applications, and measurement and control systems. It is also used in medical systems, office systems, motor control, HVAC, and entertainment and security systems. In addition, it is also used for metering, monitoring, testing, and protective relays.

Working Principle

The HE721A2420 reed relay is an electromechanical, negative-acting device that is operated by a voltage pulse signal through the thermo-magnetic copper strips and platinum contacts. It consists of a stationary electromagnet and a reed switch. When a voltage is applied to the electromagnet, it creates a magnetic field which then activates the reed switch to make or break contact. This principle of operation can be used in applications such as motors, relays, and transformers.

The HE721A2420 reed relay contains a thermo-magnetic copper housing which is sealed with a soft rubber O-ring. This ensures that no electric spark or current leakage is formed and provides a reliable physical seal. The contacts are made of platinum, which has superior electrical and physical properties as its purity and mechanical compliance are higher than those of traditional copper or gold materials.

The HE721A2420 reed relay also has a built-in pick-up protection and low parasitics inductivel. This ensures improved reliability and performance, while also providing superior insulation to protect against static discharge. The low contact resistances can be set via a switch, allowing selection between two different values. This ensures that the contact resistance is eliminated to reduce the excessive current spikes that might occur during normal operation.

Conclusion

The HE721A2420 reed relay is a negative input reed relay that is widely used for industrial and monitoring applications. It is used in home and industrial automation, telecommunication, household appliance, automotive applications, measurement and control systems, medical systems, motor control, HVAC, and entertainment and security systems. The special features of this reed relay include low contact resistances, pick-up protection, and low parasitics inductivel. With its improved reliability and performance, this reed relay is sure to provide superior insulation and reduce any excessive current spikes.

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