Protective element

A protective element comprising:

• a fuse element which comprises a blowout portion between a first end portion and a second end portion, and is energized in a first direction from the first end portion to the second end portion;
• and
• a case composed of an insulating material and having a housing portion therein, the housing portion being surrounded by the insulating material of the case and housing the blowout portion therein,
• wherein a length in a thickness direction in a cross section perpendicular to the first direction of the blowout portion is less than or equal to a length in a width direction perpendicular to the thickness direction in the cross section,
• a first wall surface and a second wall surface that face each other in the thickness direction are provided in the housing portion,
• a distance in the thickness direction between the first wall surface and the second wall surface is 10 times or less the length in the thickness direction of the blowout portion,
• a third wall surface and a fourth wall surface that face each other in the width direction are provided in the housing portion,
• a distance in the width direction between the third wall surface and the fourth wall surface is 1.5 times or more the length of the fuse element in the width direction, and
• the blowout portion is disposed in contact with one or both of the first wall surface and the second wall surface.