Surge current detection device

A surge current detection device detachably attached to a conductor, the surge current detection device detecting a surge current entering the conductor, the surge current detection device comprising:

• a holder including a first holder body and a second holder body facing each other, the holder releasably holding the conductor via the first and second holder bodies;
• a magnetic force concentrating member including a magnetic material, the magnetic force concentrating member being mounted on the first holder body side, removably receiving the conductor, and concentrating a magnetic flux included in a magnetic field generated by the surge current entering the conductor to a high density at a predetermined detection region;
• and
• a magnetic material sheet mounted on the second holder body side in such a manner that the magnetic material sheet is positioned at the detection region, the magnetic material sheet detecting the surge current,
• wherein that the magnetic material sheet includes
• a sheet member including a front surface and a back surface, the back surface side being disposed at the detection region,
• a recording layer provided on the front surface side of the sheet member, the recording layer including a plurality of microcapsules each including a magnetic powder, whose state of orientation changes depending on the concentrated magnetic flux, encapsulated in a floating state in a liquid, the recording layer being capable of recording and erasing a state of entrance of the surge current therein and therefrom, and
• a light transmissive protection film covering the recording layer and allowing a state of the recording and the erasure in the recording layer to be viewed from an outside.