Precautions for the use of relays
1. Try to use rectangular wave control for DC relays, and use sine wave control for AC relays.
2. In order to maintain the performance of the relay, please be careful not to drop the relay or subject it to strong impact. It is recommended not to use the relays that have fallen.
3. Use the relay as far as possible in an environment with room temperature and humidity, with little dust and harmful gases. Harmful gases include gases containing sulfur, silicon, and nitrogen oxides.
4. For the magnetic latching relay, it should be placed in the action or reset position as required before use. Pay attention to the polarity and pulse width when applying voltage to the coil.
5. For polarized relays, please pay attention to the polarity ( plus , -) of the coil voltage. In addition, there are other precautions. The following will roughly refer to the order of "Table 1 Relay Selection Principles".
6. Under the same current, the direct current (DC) voltage value that the relay can reliably switch is much lower than the alternating current (AC) voltage value, because the alternating current has a zero point (the point where the current is zero), and the generated arc is easy to extinguish. For direct current, the generated arc can only be extinguished after the gap between the contacts reaches a certain value, which makes the arc last longer than in the case of AC, which intensifies the consumption of contacts and material transfer.
7. When the relay contact action is synchronized with the alternating current phase of the switched load, if the contact is always turned on or off when the load voltage is high, as shown in Figure 2, the bonding or material transfer of the contact will be increased. As a result, the relay will fail prematurely. Please confirm in actual use that the random phase is on and off.
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