CPC H01H 37/76 (2013.01) [H01H 85/02 (2013.01); H01H 85/50 (2013.01)] | 6 Claims |
1. 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.
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