The main reason of high temperature when using terminal block

There are two main reasons why terminal blocks may generate high temperatures:

1. Loose terminals leading to increased circuit resistance, resulting in overheating.
2. Control circuit experiencing overcurrent due to reasons such as high power supply voltage or load short circuit faults.

Here are some solutions to these issues:
1. Check the working voltage from the secondary coil of the transformer to the distribution cabinet and then to the electrical equipment.
2. Ensure proper grounding from the transformer to the distribution cabinet to prevent common faults in grounding.