Electrical connection box

An electrical connection box comprising:

• an electronic component;
• an internal conductive member that electrically connects the electronic component to an external power supply;
• a frame including a cylindrical wall provided with an opening at least at one end, and having a cylindrical portion that houses and holds the electronic component and the internal conductive member in a cylinder of the cylindrical portion;
• a cover member that closes the opening of the cylindrical portion;
• and
• a circuit protection component that is disposed outside the frame and outside the cylinder of the cylindrical portion and cuts off an overcurrent between the external power supply and an external load, wherein
• the internal conductive member includes a first electrical connection portion and a second electrical connection portion that are physically and electrically connected to the electronic component in the cylinder of the cylindrical portion,
• the cylindrical wall of the cylindrical portion includes an opposing wall body disposed to face the circuit protection component outside the cylinder,
• the circuit protection component includes:
• a conductive circuit protection member that is a member that cuts off an overcurrent between the external power supply and the external load between a power supply-side electric wire electrically connected to the external power supply and a first load-side electric wire electrically connected to the external load, and is capable of electrically connecting a first terminal part of an additional circuit protection component for cutting off an overcurrent between the external power supply and an additional external load to be added to the external power supply;
• an additional power supply-side electrical connection structure capable of electrically connecting the first terminal part of the additional circuit protection component and the circuit protection member outside the frame;
• and
• an additional load-side electrical connection structure capable of electrically connecting a second load-side electrical wire electrically connected to the additional external load and a second terminal part of the additional circuit protection component outside the frame,
• the circuit protection member includes:
• a power supply connection portion that causes the power supply-side electric wire to be electrically connected and causes the second electrical connection portion of the internal conductive member to be physically and electrically connected;
• a load connection portion that causes the first load-side electric wire to be electrically connected;
• a fusible portion interposed between the power supply connection portion and the load connection portion;
• an additional electrical connection portion that causes the first terminal portion to be physically and electrically connected;
• and
• a coupling portion that couples the additional electrical connection portion to the power supply connection portion,
• the circuit protection component is disposed in a state where the additional electrical connection portion is exposed to a side opposite to a side of the opposing wall body,
• the additional power supply-side electrical connection structure is a connection structure that detachably and physically connects the first terminal part of the additional circuit protection component to the additional electrical connection portion of the circuit protection member on the side opposite to the side of the opposing wall body, and
• the additional load-side electrical connection structure is a connection structure for detachably and physically connecting a load-side terminal fitting at an end of the second load-side electric wire and the second terminal part of the additional circuit protection component on the side opposite to the side of the opposing wall body.