An intermediate car electric coupler control circuit for a subway vehicle includes a coupling state relay, a power supply circuit for a decoupling electromagnetic valve, a first power supply circuit for an electric coupler control relay, a second power supply circuit for an air path and electric coupler module control electromagnetic valve, and a third power supply circuit for a bus control contactor. A coupler coupling operation is performed exactly according to a sequence of a mechanical coupling, an air path conduction, an electric coupler extension, and a medium- and low-voltage bus closing, wherein contacts of electric couplers are prevented from being damaged. A coupler decoupling operation is performed exactly according to a sequence of a contact heavy-current removal, an electric coupler withdrawal, an air path disconnection and a mechanical decoupling, wherein the contacts are prevented from being damaged by a heavy current arcing and a discharge.

A high-power plug connection system has a cable connection housing for connecting at least two electric high-power plug connectors in order to transmit and/or distribute a high current strength and/or a high electric voltage. The cable connection housing receives at least two insulating bodies for receiving at least one respective high-power contact and at least one electrically conductive rail in an interior. The rail is designed to establish an electrically conductive connection between the at least two high-power contacts, and the insulating bodies protrude at least partly out of the interior through a respective housing opening and into a connection region, the connection region being designed to receive the high-power plug connector.

An inserted connection member for a train connector includes an insertion needle, an insulator, a disconnection preventing pad and an extrusion block. The insulator is sequentially provided with a positioning hole and an inserted connection hole in an axial direction. The insertion needle includes a line connecting segment, a positioning segment and an inserted connection segment which are connected sequentially, the line connecting segment and the positioning segment are arranged in the positioning hole. The disconnection preventing pad and the extrusion block are both sleeved on the line connecting segment, and the disconnection preventing pad includes a pad body and a boss arranged on the pad body. Thus, the insertion needle is ensured to maintain a stable contact even when the train is running at a high speed, and a disconnection preventing effect of the insertion needle is achieved.

An inserted connection member for a train connector includes an insertion needle, an insulator, a disconnection preventing pad and an extrusion block. The insulator is sequentially provided with a positioning hole and an inserted connection hole in an axial direction. The insertion needle includes a line connecting segment, a positioning segment and an inserted connection segment which are connected sequentially, the line connecting segment and the positioning segment are arranged in the positioning hole. The disconnection preventing pad and the extrusion block are both sleeved on the line connecting segment, and the disconnection preventing pad includes a pad body and a boss arranged on the pad body. Thus, the insertion needle is ensured to maintain a stable contact even when the train is running at a high speed, and a disconnection preventing effect of the insertion needle is achieved.

A connection structure includes: a circuit breaker connected to a power cable through which high-voltage power is supplied; a high-voltage device box accommodating the circuit breaker; a main transformer configured to transform a voltage of the high-voltage power and provided under the floor of the car; a first connector device electrically connected to the circuit breaker and provided at a dividing wall of the high-voltage device box; a second connector device electrically connected to the main transformer and provided at a dividing wall of the main transformer; and a high-voltage cable covered with an insulating coating and having both end portions to which cable connector portions are respectively attached, wherein the high-voltage cable connects the first connector device and the second connector device in such a manner that the cable connector portions respectively fit and are connected to the first connector device and the second connector device.

A connection structure includes: a circuit breaker connected to a power cable through which high-voltage power is supplied; a high-voltage device box accommodating the circuit breaker; a main transformer configured to transform a voltage of the high-voltage power and provided under the floor of the car; a first connector device electrically connected to the circuit breaker and provided at a dividing wall of the high-voltage device box; a second connector device electrically connected to the main transformer and provided at a dividing wall of the main transformer; and a high-voltage cable covered with an insulating coating and having both end portions to which cable connector portions are respectively attached, wherein the high-voltage cable connects the first connector device and the second connector device in such a manner that the cable connector portions respectively fit and are connected to the first connector device and the second connector device.

An insulating element for a high-power plug connector system comprises at least one stop formation for limiting the distance of insertion into the high-power plug connector system and at least one cutout, which allows contact to be established between a receivable high-power contact and at least one electrically conductive bar. The insulating element has at least one retaining formation, which is located on the periphery of the insulating element, near the stop formation.

An insulating element for a high-power plug connector system comprises at least one stop formation for limiting the distance of insertion into the high-power plug connector system and at least one cutout, which allows contact to be established between a receivable high-power contact and at least one electrically conductive bar. The insulating element has at least one retaining formation, which is located on the periphery of the insulating element, near the stop formation.

A railcar power connector includes a connector body defining a central opening configured to receive a portion of a cable, and a spring member having a protrusion moveable relative to the connector body between a locked position where the protrusion is configured to be secured to a mating connector and a released position where the protrusion is configured to be released from a corresponding recess of a mating connector. The protrusion moveable from the locked position to the released position upon a predetermined axial force applied to the spring member.

A railcar power connector includes a connector body defining a central opening configured to receive a portion of a cable, and a spring member having a protrusion moveable relative to the connector body between a locked position where the protrusion is configured to be secured to a mating connector and a released position where the protrusion is configured to be released from a corresponding recess of a mating connector. The protrusion moveable from the locked position to the released position upon a predetermined axial force applied to the spring member.