Reactor with cover

A reactor comprising:

• a core body, the core body including an outer peripheral iron core, at least three iron cores disposed to contact an inner surface of the outer peripheral iron core or disposed to be coupled to the inner surface, and a coil wound around the iron core, wherein
• a gap capable of being magnetically coupled between one iron core among the at least three iron cores and another iron core adjacent to the one iron core is formed,
• the reactor further comprising:
• an energizing portion connected to the coils and configured to be connected to a cable;
• and
• a cover provided to cover the energizing portion, wherein
• at least one cutout is formed on a side surface of the cover, at least one adjustment member is provided on the side surface of the cover, extends in a circumferential direction of the cutout and adjusts an area of the cutout, and the at least one adjustment member is configured to be cut away from the cutout, or is configured to be bent with respect to a surface where the cutout is formed.