An insulating component having a first core accommodating section that receives a first magnetic body core, a second core accommodating section that receives a second magnetic body core, and a locking section. The first core accommodating section has two parallel core leg section accommodating sections that individually surround one of at least two leg sections of the first magnetic body core. The second core accommodating section is configured to surround the second magnetic body core. An aperture section is formed in the insulating component between the two parallel core leg section accommodating sections. The locking section is configured to be locked to a bus bar inserted into that aperture section.