Reverse voltage and over-voltage surge protection circuit diagram XTR106

The circuit utilizes a Zener diode D1 to limit surge voltage and incorporates a four-diode rectifier bridge to prevent reverse voltage. The Zener diode D1 is rated at 36V, with optional choices being 1N4753A or 6KE39A. When the loop voltage falls below 30V, an optional lower voltage Zener diode can be used for enhanced protection.

The circuit is designed to safeguard sensitive components from voltage spikes that can occur in various electronic applications. The Zener diode D1 plays a crucial role in clamping the voltage to a specified level, preventing excessive voltage from damaging downstream components. The specified Zener voltage of 36V ensures that the circuit remains operational within its safe limits while allowing transient voltages to be effectively managed.

The four-diode rectifier bridge serves to convert alternating current (AC) to direct current (DC) while also providing protection against reverse polarity. This configuration is essential in applications where the supply voltage may occasionally reverse, as it helps to prevent damage to the circuit.

In scenarios where the loop voltage is observed to drop below 30V, the use of a lower voltage Zener diode is recommended. This adaptation enhances the protective measures of the circuit, ensuring that even under lower voltage conditions, the components remain safeguarded. The choice of Zener diodes, such as the 1N4753A or 6KE39A, allows for flexibility in design, enabling engineers to select a component that best fits the specific requirements of the application.

Overall, this circuit configuration exemplifies a robust approach to voltage regulation and protection, making it suitable for various electronic devices that require reliable operation in fluctuating voltage environments. As shown, the circuit uses the Zener diode D1 limits the surge voltage, use four diode rectifier bridge to prevent reverse voltage. Zener diode D1 is 36V, optional 1N4753A or P 6KE39A. When the loop voltage is below 30V, in order to increase protection, the optional lower tube voltage of D1.