Protection element

A protection element, comprising:

• a fuse element configured to be energized in a first direction, which is a direction from a first end portion of the fuse element to a second end portion of the fuse element;
• a shielding member composed of an insulating material, configured to rotate to a rotated position around a rotation axis extending in a second direction orthogonal to the first direction, and comprising a plate-shaped part which comprises a first surface and a second surface, the first surface facing the fuse element and a second surface being in contact with the rotation axis, wherein the plate-shaped part viewed from the fuse element is divided to a first portion and a second portion at a contact position between the plate-shaped part and the rotation axis, and an area of the first portion and an area of the second portion are different from each other;
• and
• a case composed of an insulating material, and having therein a housing portion in which the fuse element and the shielding member are stored,
• wherein pressure elevation in the housing portion due to an arc discharge generated when the fuse element fuses causes the first surface to be pressed so that the shielding member to rotate around the rotation axis and the shielding member divides the housing portion.