THD7621C

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Time delay relays are electronic devices that provide a delay for activating or deactivating an electrical device or circuit. They can be used for a wide range of applications ranging from signal transmission and sequencing to motor control and motor protection. The THD7621C is a universal time delay relay module developed to provide high performance, reliability and flexibility in applications where a reliable, delayed response is required.

The THD7621C combines the features of a time-delay relay, PLC timer control and time-metering control in one compact, integrated unit. It is capable of providing delay times ranging from 10 milliseconds to 999 seconds or 999 cycles. It can be configured for continuous looping or one-time delay pulses. The module is designed to meet UL and cUL requirements. It is also RoHS compliant and has a temperature range of -20 to +55°C.

The THD7621C features two operating modes – timer mode and cycle mode. In timer mode, the relay can be set to trigger at a predetermined delay time. In cycle mode, the relay can be triggered at a set cycle time, with each cycle being equal in length. The THD7621C also features a built-in watchdog timer that provides extra protection from power interruption or system failure.

The THD7621C is easy to install and program. It is a perfect choice for applications where a reliable, delayed response is needed such as motor control, sequencing, signal transmission and overload protection. Its features and performance make it an ideal solution for any time delay applications.

The working principle of the THD7621C is based on a series of electrical and electronic components that allow it to provide an accurate and reliable delay and cycle time with minimal power consumption. The unit is equipped with a set of DC-DC converter, an adjustable hysteresis switch, a timer circuit, a logic control circuit and a relay switch.

When the power is turned on, the DC-DC converter supplies the required voltage to the timer circuit. Based on the delay settings, the timer circuit will trigger the logic control circuit. The logic control circuit then triggers the hysteresis switch, which is responsible for switching the relay on and off. The exact timing of the delay and cycle parameters is determined by the delay accuracy of the timer circuit and the hysteresis switch.

The THD7621C is a reliable, flexible and cost-effective way to add reliable time delay and control to any application. Its features, performance and flexibility make it an ideal choice for a variety of applications. It is also RoHS compliant, making it suitable for use in most industrial and commercial applications.

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