H3RN-21 AC24

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Time Delay Relays (TDRs) are a type of relays which are employed to achieve a delayed action. The H3RN-21 AC24 is one of the many types of TDRs available on the market today and it has a number of uses in a variety of applications. This article will discuss the application field and working principle of this particular TDR.

Application field

The H3RN-21 AC24 is a time delay relay which is suitable for applications which require a repeat cycle. It can be used in applications to delay on, delay off, interval on, and interval off. It is also capable of setting time intervals of 10 seconds to 10 minutes.

The H3RN-21 AC24 is commonly used in motor control circuits, process control, HVAC systems, home appliances, and lighting systems. It can also be used to reset other relays or to act as an overload protection device. Its versatility makes it useful in a variety of settings.

Working Principle

The H3RN-21 AC24 operates on a simple, yet effective, principle. When the device is in its “on” mode, the relay coil is energized and the contacts close. The contacts will remain closed until the device times out and the coil is de-energized. At this point, the contacts will open and the device will return to its original state.

The device will cycle through these states each time it is activated. The length of time the device is in its “on” state can be adjusted by adjusting the time potentiometer on the device. This allows for flexibility in the usage of the device in a variety of applications.

The H3RN-21 AC24 also has an auto-reset feature which allows the device to reset itself after it has completed its cycle. This feature eliminates the need for manual resetting and is a convenient feature for applications which require frequent resets.

Conclusion

The H3RN-21 AC24 is a versatile time delay relay which is used in a variety of applications. It operates on a simple principle and is capable of repeating its cycle indefinitely. Its adjustable time potentiometer and auto-reset feature provide flexibility in its usage and it can be used in settings which require repeat cycling, delay on/off, or interval on/off.

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