The different test standards for protection circuit upgrades correspond to different protection schemes. There are several major protection principles for protection circuits:

1. Safety principle: Avoid equipment damage or personal safety due to device operation.

2. Reliability principle: able to meet customer testing standards.

3. Usability principle: cannot affect the normal operation of customer equipment.

4. Economic principle: Select the most cost-effective components to meet customer requirements.

5. Classification protection principle: Determine whether the classification protection is reasonable according to the actual application environment.

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