TDR4B22 Industrial Controls

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Time Delay Relays

Time Delay Relays, or TDRs, are a type of industrial automation relay used for applications where a preset time delay is necessary. They are most often used to control motors, valves, lights, heating elements, and other equipment that needs to be turned on or off after a certain period of time. TDR4B22 is one such relays normally used in the automotive, telecommunication, and process control industries.

TDR4B22 Application Field

TDR4B22 is designed for use in applications where time delays are required from 0.1 seconds to 12 hours. It offers a variety of timing ranges and functions, including on-delay, off-delay, interval, and single/multiple pulse control. It permits one-touch reset as well as instant reset of the timing cycle.

In the automotive industry, TDR4B22 is used to control electronic fuel injection systems, oil pumps, exhaust gas recirculation valves, cooling fan control etc. In the telecommunication sector, it is used as a driver for digital data transmitters. In process control applications, it is commonly used to control flow, temperature, and pressure.

TDR4B22 Working Principle

TDR4B22 works based on a timer. It has a control input from a switch which is used to start the timing cycle. It has two output contacts which control the on/off state of the load. When the switch is activated, the relay is energized and the internal time delay starts. The length of the time delay depends on the model and settings. After the predetermined time delay has elapsed, the relay de-energizes the load. The output contacts then function as a latching relay holding the load in the off state until the switch is activated again to reset the time delay.

With its wide range of timing timing ranges and functions, TDR4B22 is an ideal choice for applications where time delays are required.

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