12v 5 pin relay products related questions and answers

12v 5 pin relay products are relatively non-contact relay products. What are its advantages and disadvantages?

Answer: 12v 5 pin relay products have an open distance, so the withstand voltage level is high, while the non-contact relay has a low withstand voltage level. There is a very important parameter called the conversion depth h, which is equal to the ratio of the breaking resistance of the relay contact to the making resistance. For 12v 5 pin relay products, the magnitude of h is between 10 and 12, while for relays without contact, the magnitude of h is between 5 and 8, with a difference of at least 2 orders of magnitude. The lower the value of h, the greater the power consumption, and the more serious the heating of the relay. The biggest advantage of a non-contact relay is that it has a short turn-on time and high sensitivity.

What impact will the return coefficient of 12v 5 pin relay products bring if the value is too small or too large?

Answer: If the return factor of 12v 5 pin relay products is too small, reliability will be reduced, while too high a return factor will easily cause malfunction. For example, for a 12V relay, if the return coefficient is set to 1, then at the voltage value of 0.7x12=10.8V, the relay will bounce when it is pulled in and released, causing the coil to heat up violently, which greatly reduces the electrical life of the relay; The return coefficient is set to 0.1, that is, when the relay is closed at 10.8V and released at 1.08V, the reliability of the relay's operation will be reduced. For example, we use transistors to control relays. As long as the penetrating current is slightly larger, the relay cannot be released. This problem can be serious. Another example is the distributed capacitance between the wires. If the wire is very long, the distributed capacitance of the wire is sufficient to keep the DC relay for a period of time before releasing, but the AC relay may not release at all. It can be seen that it is not good if the return coefficient of 12v 5 pin relay products is too large or too small. However, some special relays, such as voltage relays, require an adjustable return coefficient, and the maximum value of the return coefficient is relatively high.