![]() Make sure that the diode carries a forward current equal to or larger than a load current. For an ordinary circuit, we recommend that you select a diode having a reverse withstand voltage of 10 times or more the circuit voltage. ![]() For a stable electronic circuit whose circuit voltage is not very high, you have to select a diode with a reverse withstand voltage of 2 to 3 times the source voltage. The diode, which is a type of load, consumes an incoming surge current, thus protecting the circuit and its element. This protective circuit can only be applied to the DC circuit. 1, a diode works well as a protective circuit for a DC inductive load. We will now describe the respective measures to take for these DC and AC inductive loads.Īs shown in Fig. A protective circuit for a DC inductive load is different from that for an AC inductive load. To protect the contact and circuit from this reverse voltage, you need a protective circuit. ![]() As a result, the service life of the circuit is reduced significantly. This voltage is referred to as "reverse voltage." A high reverse voltage causes a large current to flow through the circuit, which damages the contact that controls power supply to the inductive load, and the circuit itself as well. When an inductive load, such as a relay coil, is cut off from a circuit, the load generates a high voltage of hundreds to thousands of volts in the reverse direction to the source voltage. Let us explain surge voltages in greater detail. These diodes and CR circuits must be connected in parallel with the load. A diode works well in a DC circuit, while a CR circuit is effective in an AC circuit. Measures for dealing with such surge voltages vary depending on whether the circuit carries AC or DC. This inductive load in a circuit generates a large surge voltage when it is cut off from the circuit, and this surge voltage can destroy contacts or electronic circuit elements. Question: What should I do to protect a contact or circuit from a surge voltage that is generated when the power supply to an inductive load is cut off?Īnswer: A relay coil is an inductive load. What should you do to protect your circuit from a surge, i.e., a surge voltage? We will now tell you about the method you should take to protect the circuit. It is a troublesome phenomenon that can lead to the destruction of a circuit element. A "surge" refers to the generation of an extremely high voltage that far exceeds a voltage generated in a steady state. We have questions from customers on how to protect relay coils from surges, which we will answer by providing detailed explanations.
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