| 摘要 |
A protection device arranged on an electric current path between a load unit including a stabilized power supply unit and a DC power supply, includes: a switching unit including an FET having a source terminal and a drain terminal arranged on an electric current path between the DC power supply and the load unit; and an input end to which a voltage generated by the stabilized power supply circuit in the load unit as a control voltage, the control voltage being capable of turning on the FET in a case of forward connection in which a positive input terminal of the load unit is connected to an anode of the DC power supply and a negative input terminal of the load unit is connected to a cathode of the DC power supply, and turning off the FET in a case of reversed connection in which the positive input terminal of the load unit is connected to the cathode of the DC power supply and the negative input terminal of the load unit is connected to the anode of the DC power supply, wherein the control voltage is applied to a gate terminal of the FET via the input end.
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