ND470825

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Thyristors are semiconductor devices consisting of four layers of alternating n-type and p-type materials. They are solid-state switches controlled by an external gate voltage and are commonly used as key components in power control, power switching and motor control applications. In particular, Silicon Controlled Rectifiers (SCRs) are used for various purposes including power surge protection, and as a power switch in many power supplies and consumer electronics. Module applications such as the ND470825 are designed to control incoming current and help protect circuits from overcurrents and short-circuits.

The ND470825 module is a Thyristor Surge Protective Device (TSPD) designed to protect circuits and personnel against short-circuit and overcurrent damage. This product is a 25A, 70V, 2-pin-/3-pin- modules with a tunable current threshold of 0.7V to 3.8V. It is a low-cost, off-the-shelf solution that is suitable for industrial and white goods applications.

The working principle of the ND470825 is based on a lockout feature that prevents the SCR from conducting current until the instant current sent through the device reaches a preset level. This is known as a “breakover voltage”. When the preset level is reached, the SCR will allow current to flow for a predetermined time. If the current is still above the predetermined level, the SCR will “lockout” and refuse to allow current through until the overcurrent situation has been rectified.

The ND470825 has several features that make it particularly useful in industrial applications. It can be used in a variety of operating voltages up to 70V, and has a high-current capacity of 25A. Its high isolation voltage allows it to withstand high voltages, making it ideal for use in noisy or potentially hazardous areas or environments. Furthermore, its 3-pin module design facilitates easy installation, while its two-pin design simplifies connection to an MCU, PLC or other digital controllers.

The ND470825 also has a number of protective features that help ensure its reliable operation. These include an adjustable overcurrent protection level, and a preset startup delay function. The adjustable overcurrent protection level allows the user to set the level of current that must be exceeded before the device will turn on. The preset startup delay allows the user to set a time delay of up to 5ms before the device will turn on, ensuring that the system is up and running before the device becomes energized.

In conclusion, ND470825 is a highly versatile and reliable Thyristor Surge Protective Device (TSPD) capable of securing circuits and users from overcurrents and short-circuid damage. Its adjustable overcurrent protection level and preset startup delay function make it ideal for industrial applications, while its 3-pin module design simplifies installation and wiring. The ND470825 is an off-the-shelf solution that provides reliable protection in a cost effective package.

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