Protection element and protection circuit

A protection circuit comprising:

• a plurality of protection elements connected in parallel,
• wherein each protection element configuring the plurality of protection elements has a first fuse element and a second fuse element connected in series,
• a heater connected between the first fuse element and the second fuse element,
• a first electrode part connected to a first end portion of the first fuse element on a side opposite to the second fuse element,
• a second electrode part connected to a first end portion of the second fuse element on a side opposite to the first fuse element,
• a third electrode part connected to both of a second end portion of the first fuse element and a second end portion of the second fuse element and connected to the heater in series,
• a conduction part directly connected to the third electrode part and having a lower resistance value than the heater, and
• a fourth electrode part directly connected to the conduction part and provided to be connectable to an external protection circuit,
• wherein the plurality of protection elements are connected in parallel,
• the protection circuit includes a bypass circuit connecting a plurality of the fourth electrode parts provided in the plurality of protection elements,
• the first fuse element and the second fuse element are integrally formed,
• the second end portion of the first fuse element and the second end portion of the second fuse element are directly connected,
• the third electrode part and the fourth electrode part are connected through the heater, and
• the conduction part is formed along at least one through hole penetrating a substrate in a thickness direction.