Protection device for preventing reverse connection

A protection device of an electronic device to which power is supplied from a direct-current power source that includes a positive wiring and a negative wiring, the protection device comprising:

• a first switch including:
• an input terminal to which the positive wiring or the negative wiring is connected;
• a first output terminal connected to a first node;
• and
• a second output terminal connected to a second node;
• a second switch including including:
• an input terminal to which the positive wiring or the negative wiring is connected;
• a first output terminal connected to a third node;
• and
• a second output terminal connected to a fourth node;
• a first relay connected between the first node and a positive input terminal of the electronic device;
• a second relay connected between the third node and a negative input terminal of the electronic device;
• and
• an indication element connected between the second node and the fourth node, the indication element being configured to perform an indication operation when the negative wiring is connected to the input terminal of the first switch and the positive wiring is connected to the input terminal of the second switch in a state in which the first switch is switched to the second output terminal and the second switch is switched to the second output terminal.

A protection device of an electronic device to which power is supplied from a direct-current power source that includes a positive wiring and a negative wiring, the protection device comprising:

• a first switch including:
• an input terminal to which the positive wiring or the negative wiring is connected;
• a first output terminal connected to a first node;
• and
• a second output terminal connected to a second node;
• a second switch including:
• an input terminal to which the positive wiring or the negative wiring is connected;
• a first output terminal connected to a third node;
• and
• a second output terminal connected to a fourth node;
• a first relay connected between the first node and a positive input terminal of the electronic device;
• a second relay connected between the third node and a negative input terminal of the electronic device;
• and
• an indication element connected between the first node and the third node, the indication element being configured to perform an indication operation when the negative wiring is connected to the input terminal of the first switch and the positive wiring is connected to the input terminal of the second switch in a state in which the first switch is switched to the first output terminal thereof and the second switch is switched to the first output terminal thereof.