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What is the reason why the box-type resistance furnace trips under normal heating conditions?

ምክንያቱ ምንድን ነው የሳጥን ዓይነት የመቋቋም ምድጃ trips under normal heating conditions?

1. The switch is damaged;

2. The electric resistance furnace leaks and the protection switch works;

3. Short circuit caused by the burning of the furnace wire;

4. The switch current is overloaded and tripped.