An integrated air cooling and arc resistant system is provided for a voltage drive. The system comprises a cabinet including a back, an upper portion and a lower portion. The system further comprises a plurality of power cells disposed in the cabinet. The system further comprises a central chimney vertically disposed in the cabinet. The system further comprises a transformer disposed in the cabinet and being underneath the plurality of power cells. The transformer has a top end and a bottom end. The system further comprises a vertical plenum disposed in the back of the cabinet. The vertical plenum is configured to flow cool air passing from the plurality of power cells towards the bottom end of the transformer.

A HVDC disconnector is disclosed. The HVDC disconnector comprises a fixed contact comprising a guide and a pair of conducting members positioned in the guide wherein the first and second conducting members are both tulip contacts; a movable contact comprising a fixed arm and a mobile arm having a conducting terminal, wherein the mobile arm is movable from an open position to a closed position to close a connection between the fixed contact and the second contact.

A HVDC disconnector is disclosed. The HVDC disconnector comprises a fixed contact comprising a guide and a pair of conducting members positioned in the guide wherein the first and second conducting members are both tulip contacts; a movable contact comprising a fixed arm and a mobile arm having a conducting terminal, wherein the mobile arm is movable from an open position to a closed position to close a connection between the fixed contact and the second contact.

An improved high speed breaker for industrial or railways applications wherein a high D.C. current must be interrupted with high efficiency and extremely fast intervention times. The breaker includes, in a casing, a base portion supporting an activating a switching mechanism including a holding mechanism and a release mechanism, an intermediate switching or breaking contacts portion, including fixed contacts and movable contacts, and a top arc chute extinguishing portion covering the switching or breaking contact portion, wherein intermediate delimiting portions are provided on both sides of the casing to delimit laterally the intermediate switching or breaking contact portion and to provide lateral guides for the arc chute extinguishing portion, wherein the arc chute extinguishing portion is slidably mounted in the casing, and wherein at least a lever mechanism is extended transversally between the opposite intermediate delimiting portions for moving or raising the arc chute extinguishing portion for inspection.

An improved high speed breaker for industrial or railways applications wherein a high D.C. current must be interrupted with high efficiency and extremely fast intervention times. The breaker includes, in a casing, a base portion supporting an activating a switching mechanism including a holding mechanism and a release mechanism, an intermediate switching or breaking contacts portion, including fixed contacts and movable contacts, and a top arc chute extinguishing portion covering the switching or breaking contact portion, wherein intermediate delimiting portions are provided on both sides of the casing to delimit laterally the intermediate switching or breaking contact portion and to provide lateral guides for the arc chute extinguishing portion, wherein the arc chute extinguishing portion is slidably mounted in the casing, and wherein at least a lever mechanism is extended transversally between the opposite intermediate delimiting portions for moving or raising the arc chute extinguishing portion for inspection.

A switch pole for a low voltage switching device including an insulating casing defining an internal space with a contact region and an arc extinguishing region of said switch pole, a fixed contact assembly and a movable contact assembly positioned in said contact region and including, respectively, one or more fixed contacts and one or more movable contacts, which can be mutually coupled or uncoupled, and an arc chamber positioned in said arc extinguishing region and including a plurality of parallel arc-breaking plates and a terminal arc-breaking element, which includes a plate portion arranged in parallel to said arc-breaking plates and a cover of electrically insulating material coating, at least partially, a surface of said plate portion.

A switch pole for a low voltage switching device including an insulating casing defining an internal space with a contact region and an arc extinguishing region of said switch pole, a fixed contact assembly and a movable contact assembly positioned in said contact region and including, respectively, one or more fixed contacts and one or more movable contacts, which can be mutually coupled or uncoupled, and an arc chamber positioned in said arc extinguishing region and including a plurality of parallel arc-breaking plates and a terminal arc-breaking element, which includes a plate portion arranged in parallel to said arc-breaking plates and a cover of electrically insulating material coating, at least partially, a surface of said plate portion.

Disclosed are a circuit breaking unit and an air circuit breaker including the same. The present disclosure provides a circuit breaking unit, including a fixed contact; a movable contact that is in contact with or spaced apart from the fixed contact; a fixed contact terminal having the fixed contact disposed at a lower end thereof and extending upward; a movable contact terminal including the movable contact and configured such that the movable contact is formed to move in a direction toward the fixed contact or in a direction away from the fixed contact; a low runner disposed extending upward from the fixed contact, one end thereof coupled to the fixed contact terminal, and the other end thereof spaced apart from the fixed contact terminal; and a protruding contact disposed extending upward from the movable contact, energized when in contact with the low runner, and spaced apart from the low runner when the movable contact is tripped.

A high-voltage large-current relay includes an electromagnet, at least one fixed transmission contact, at least one movable transmission contact, at least one fixed arc-striking contact, and at least one movable arc-striking contact. The fixed transmission contact and movable transmission contact are corresponsive to each other, and the fixed arc-striking contact and movable arc-striking contact are corresponsive to each other. The relay further includes at least one arc-striking spring plate and at least one transmission spring plate for installing the movable transmission contact and movable arc-striking contact respectively. The movable arc-striking contact is smaller than the movable transmission contact, and the arc-striking spring plate and the transmission spring plate are operated together. Before the electromagnetic effect of the electromagnet drives the movable transmission contact and fixed transmission contact into an open or closed state, the movable arc-striking contact and fixed arc-striking contact are contacted with each other.

A high-voltage large-current relay includes an electromagnet, at least one fixed transmission contact, at least one movable transmission contact, at least one fixed arc-striking contact, and at least one movable arc-striking contact. The fixed transmission contact and movable transmission contact are corresponsive to each other, and the fixed arc-striking contact and movable arc-striking contact are corresponsive to each other. The relay further includes at least one arc-striking spring plate and at least one transmission spring plate for installing the movable transmission contact and movable arc-striking contact respectively. The movable arc-striking contact is smaller than the movable transmission contact, and the arc-striking spring plate and the transmission spring plate are operated together. Before the electromagnetic effect of the electromagnet drives the movable transmission contact and fixed transmission contact into an open or closed state, the movable arc-striking contact and fixed arc-striking contact are contacted with each other.