An electromagnetic device includes a spool having a cylindrical body with a through hole, a secondary coil formed in a spiral shape along an outer peripheral surface of the cylindrical body and formed with a closed circuit by metal plating, and a primary coil formed of a conductive wire wound around the secondary coil via an insulating material covering the secondary coil. An induced current, generated by applying a voltage to any one of the primary coil and the secondary coil, is allowed to flow to the other coil different from the one coil.

An electromagnetic contactor to open and close a contact formed by a movable contact and a fixed contact. The electromagnetic contactor includes an arc extinguishing cover having a shape in which a center portion is concaved with respect to an edge portion in a first direction and in which faces having a same height as the center portion continue in a second direction crossing the first direction; and an operation indicating piece arranged at an end of the movable contactor, to indicate a contact state of the contact by projecting from the center portion of the arc extinguishing cover or by being embedded therein. A step between the edge portion and the center portion of the arc extinguishing cover is equal to or larger than a projecting amount of the operation indicating piece that projects from the center portion of the arc extinguishing cover.

A removable electric current switching element includes first and second housing parts fitted to the other and that can be moved between an assembled configuration and a partially disassembled configuration. The first housing part includes side walls provided with through inspection windows, the second housing part includes insulating walls which each delimit a volume in the second housing part around a corresponding mobile conductor. The first and second housing parts are arranged relative to one another in such a way that, in the assembled configuration the insulating walls mask the inspection windows and that, in the intermediate configuration the insulating walls are away from the inspection windows to free access to the inspection windows.

A removable electric current switching element includes first and second housing parts fitted to the other and that can be moved between an assembled configuration and a partially disassembled configuration. The first housing part includes side walls provided with through inspection windows, the second housing part includes insulating walls which each delimit a volume in the second housing part around a corresponding mobile conductor. The first and second housing parts are arranged relative to one another in such a way that, in the assembled configuration the insulating walls mask the inspection windows and that, in the intermediate configuration the insulating walls are away from the inspection windows to free access to the inspection windows.

An electromagnetic relay includes a terminal electrically connected to a fixed contact or a movable contact, and a case accommodating a contact point. The terminal includes a terminal piece having at least a portion located outside the case. The case includes a bottom surface section (first peripheral wall section) and a side surface section (second peripheral wall section). The bottom surface section has a gap to be closed with a sealant and an outer surface to which the sealant is applied. The side surface section has a through hole through which the terminal piece is inserted. The case has a flow path along which the sealant applied to the outer surface flows from the outer surface to the through hole.

An electromagnetic relay includes a terminal electrically connected to a fixed contact or a movable contact, and a case accommodating a contact point. The terminal includes a terminal piece having at least a portion located outside the case. The case includes a bottom surface section (first peripheral wall section) and a side surface section (second peripheral wall section). The bottom surface section has a gap to be closed with a sealant and an outer surface to which the sealant is applied. The side surface section has a through hole through which the terminal piece is inserted. The case has a flow path along which the sealant applied to the outer surface flows from the outer surface to the through hole.

The disclosure provides a contactor and an air conditioning system. The contactor includes a main body, a first electrical terminal, a second electrical terminal, a contact support, and a refrigerant blocking structure. The contact support is at least partially arranged in the main body and arranged between the first electrical terminal and the second electrical terminal. The contact support is configured such that a power received by the first electrical terminal from a power grid is at least partially transmitted to a load through the second electrical terminal when activated. The refrigerant blocking structure is arranged on a side of the main body toward the contact support, and the refrigerant blocking structure, the contact support, and the opening are arranged correspondingly, and the refrigerant blocking structure at least partially surrounds an outside of the contact support for blocking a flame generated by igniting of a refrigerant.

The disclosure provides a contactor and an air conditioning system. The contactor includes a main body, a first electrical terminal, a second electrical terminal, a contact support, and a refrigerant blocking structure. The contact support is at least partially arranged in the main body and arranged between the first electrical terminal and the second electrical terminal. The contact support is configured such that a power received by the first electrical terminal from a power grid is at least partially transmitted to a load through the second electrical terminal when activated. The refrigerant blocking structure is arranged on a side of the main body toward the contact support, and the refrigerant blocking structure, the contact support, and the opening are arranged correspondingly, and the refrigerant blocking structure at least partially surrounds an outside of the contact support for blocking a flame generated by igniting of a refrigerant.

A relay includes a fixed contact, a movable contact, a return member of the movable contact, and a case that covers the fixed contact, the movable contact, and the return member. The case is made of a material having transparency or translucency. The relay RS further includes a tray portion that is disposed above the return member and below the fixed contact and holds a fusing residue generated by separation/approach of the movable contact from/to the fixed contact. The relay further includes a cap that covers a portion of a terminal connected to the fixed contact, the portion being exposed from the case. When the cap is attached to the case, at least a portion of the case is exposed without being covered with the cap.

A relay includes a fixed contact, a movable contact, a return member of the movable contact, and a case that covers the fixed contact, the movable contact, and the return member. The case is made of a material having transparency or translucency. The relay RS further includes a tray portion that is disposed above the return member and below the fixed contact and holds a fusing residue generated by separation/approach of the movable contact from/to the fixed contact. The relay further includes a cap that covers a portion of a terminal connected to the fixed contact, the portion being exposed from the case. When the cap is attached to the case, at least a portion of the case is exposed without being covered with the cap.