Abstract: An explosion-proof structure having a housing that houses an electronic device, a cover member that covers a first ventilation port formed on one surface of the housing at least in a normal direction to the one surface, an opening/closing member that opens and closes a second ventilation port formed between the one surface and the cover member, and a rotation support portion provided at a peripheral portion of the first ventilation port and that supports the opening/closing member, the opening/closing member rotating around the rotation support portion, using the rotation support portion as a center of rotation.

Abstract: A dust-proof structure of an embodiment includes a housing and a magnetic member. The housing accommodates an electric device. The magnetic member is magnetized. The magnetic member is arranged in a flow path of a gas that flows through a ventilation port formed in the housing.

Abstract: A substrate unit of an embodiment includes a plurality of substrates and a holding part. The plurality of substrates are arranged at a constant interval in a thickness direction. The holding part integrally holds the plurality of substrates and allows, relative to one substrate of the plurality of substrates, another substrate to be movable along a plane direction of the substrate.

Abstract: A protection relay device includes a housing and a fuse unit. The fuse unit includes a connection conductor, an input conductor connected to the connection conductor and receiving an external power, a fuse connected to the connection conductor, and an external device connection conductor connected to the fuse on a side opposite to the input conductor, and to which an external device is connected. A short-circuit induction conductor is provided on at least one of the input conductor on a side opposite to the fuse and the flapper portion, the short-circuit induction conductor protruding toward the other of the input conductor and the flapper portion.

Abstract: In a power conversion device, an incorrect mounting suppressing mechanism provided on a housing and an inverter module restricts movement of the inverter module with respect to the housing in a first direction. The inverter module includes a switch that moves between an OFF position at which a connection between a bus bar and a terminal can be cut off and an ON position at which a connection between the bus bar and the terminal can be made. The incorrect mounting suppressing mechanism includes a stopper on the housing and an interference member connected to the switch that moves between the restriction position and the retracting position as the switch moves. The restriction position overlaps the stopper viewed from the first direction when the switch is in the ON position. The retracting position retracts from the stopper viewed from the first direction when the switch is in the OFF position.

Abstract: An explosion-proof structure of an electronic device includes a housing, a cover member, and an opening/closing member. The housing houses electronic components. The cover member covers a first ventilation port formed on one surface of the housing at least in a normal direction to the one surface. The opening/closing member opens and closes a second ventilation port formed between one surface and the cover member.

Abstract: A power conversion device according to an embodiment includes an element unit and a capacitor unit. The element unit includes a first positive electrode bus, a first negative electrode bus, and a first outer frame member. The capacitor unit includes a second positive electrode bus, a second negative electrode bus, and a second outer frame member. The first outer frame member and the second outer frame member are separable from each other. The first positive electrode bus and the second positive electrode bus are removably connected to each other. The first negative electrode bus and the second negative electrode bus are removably connected to each other.

Abstract: A protection relay device includes a housing and a fuse unit. The fuse unit includes a connection conductor, an input conductor connected to the connection conductor and receiving an external power, a fuse connected to the connection conductor, and an external device connection conductor connected to the fuse on a side opposite to the input conductor, and to which an external device is connected. A short-circuit induction conductor is provided on at least one of the input conductor on a side opposite to the fuse and the flapper portion, the short-circuit induction conductor protruding toward the other of the input conductor and the flapper portion.

Abstract: A power conversion device according to an embodiment includes an element unit and a capacitor unit. The element unit includes a first positive electrode bus, a first negative electrode bus, and a first outer frame member. The capacitor unit includes a second positive electrode bus, a second negative electrode bus, and a second outer frame member. The first outer frame member and the second outer frame member are separable from each other. The first positive electrode bus and the second positive electrode bus are removably connected to each other. The first negative electrode bus and the second negative electrode bus are removably connected to each other.