What are the protective functions of a qualified connector?

What are the protective functions of a qualified connector?
A qualified connector, you will need to protect the user's life as much as possible in the use of the first condition, what are the protective function of the connector?:
1, over-voltage protection
Overvoltage protection refers to the function of switching power supply when the input voltage exceeds the maximum.
2, over power protection
Over power protection means that when the output power exceeds the specified power limit, the switching power supply of the connector can automatically limit or turn off the output current.
3, under voltage protection
Under voltage protection is when the input voltage is lower than the minimum value, the switch power supply can automatically turn off the function of the power supply.
4, battery polarity reverse connection protection
Battery polarity reverse connection protection is a protection function that can protect the power supply when the polarity of the input power (battery) is not connected. The utility model is characterized in that a diode is connected in series in a direct current input circuit to realize the reverse polarity protection of the battery polarity.
5, over current protection
Over current protection means that when the output current exceeds the current limit, the switching power supply of the connector can automatically limit or turn off the output current.
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