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A detailed explanation of the common problems associated with two-point terminal connections and their solutions: First, the terminals may appear blackened. However, there is another possibility – the terminals aren’t actually burned, but have turned black due to oxidation. In such cases, it’s necessary to cut off the power supply entirely, then wipe the terminals back and forth by hand to see if the black color can be removed. If the black substance that comes off resembles ash, it indicates that the terminals have been oxidized; in this case, we can simply use sandpaper or a file to scrub them. But if the black substance cannot be removed, then it’s necessary to check the circuit to determine whether the current flow is too high, or whether the terminals are exposed to high temperatures. If needed, the terminals will have to be replaced. Secondly: The terminal blocks can overheat due to excessively high temperatures. This is usually caused by high power supply voltage, but it can also be resulting from grounding issues. If it’s caused by high voltage, then inspections should be carried out at the source, checking each component one by one; after completing these inspections, necessary maintenance should be performed. If there are grounding problems, the power supply should be disconnected first, and an insulation tester should be used to conduct sectional measurements, starting from the transformer. If sectional inspections are difficult, then the weak points and sensing devices should be removed. In fact, it’s important that the resistance of the grounding connection be low, as this not only ensures that the grounding point is at a similar potential but also helps to prevent damage caused by lightning strikes. For more information on button switches, please visit: Button Switches www.supu.com.cn