If the small power distribution unit fails, you should first ensure your own safety and do not touch live parts. Then take the following steps:

Cut off the power supply: Immediately turn off the main switch of the small power distribution unit to prevent further accidents.

Check the problem: Find out the cause of the failure, such as overload, short circuit or leakage.

Troubleshooting simple faults: For simple problems, such as a blown circuit breaker, you can replace the circuit breaker; however, if you are unsure of the problem, you should seek help from a professional electrician.

Seek professional help: If you do not have electrical knowledge, you should contact a qualified electrician or maintenance personnel, and do not repair it yourself, so as not to cause greater danger.

Preventive measures: After repairing the fault, check other lines for problems, and ensure that the small power distribution unit is maintained regularly to prevent future faults.