Abstract:
A circuit breaker with a line terminal (12) and load terminal (14), having an operating mechanism with a main, movable contact arm (30) coupled to a load terminal and an auxiliary contact apparatus (40) coupled in series with the main movable contact arm. The auxiliary contact apparatus (40) comprises an auxiliary stationary contact (42) mounted on the load terminal, an auxiliary movable contact arm (44) mounted for rotation in the circuit breaker and coupled to the main movable contact arm, an attraction plate (54) mounted in the circuit breaker and aligned with the auxiliary movable contact arm wherein a magnetic flux induced in the metal plate attracts the auxiliary movable contact arm (44).
Abstract:
A current limiter having an excellent current-limiting function and produced at low cost and a circuit breaker comprising the same and having a small impedance are provided so as to prevent the case from being damaged because of an unwanted increase of the pressure inside the case due to an arc. Contactors (1, 7) have respective contacts. When the contacts are in contact with each other, the ends on the contacts' side are in a cylindrical space in a cylindrical insulator (25); when the contacts are out of contact, one of the contacts is outside the cylindrical space. If an arc is produced, the pressure in acylindrical space (18) is abruptly increased to decrease the arc current, thus improving the current limiting performance.
Abstract:
A two-piece slot motor housing assembly (90) is provided. The slot motor housing assembly (90) includes a first J-shaped body (92) having a lower, first end (100) and a second, J-shaped body (94) having a lower, first end (110). The first and second J-shaped bodies (92, 94) coupled to form a U-shaped assembly (120). The first J-shaped body first end (100) overlaps the second J-shaped body first end (110).
Abstract:
A slot motor apparatus for a circuit breaker is disclosed. The slot motor has first and second legs connected by a thin web, and an extending portion extending rearward from the rear faces of the legs. Slot motor - arc plate assemblies having an arc plate assembly received at least partially overtop of the extending portion are also disclosed, as are assemblies having the arc plate assembly received very close to the rear faces of the slot motor legs. Circuit breakers, slot motor - arc plate assemblies, slot motor covers, and methods of operating the slot motor - arc plate assemblies are disclosed, as are other aspects.
Abstract:
A circuit breaker equipped with a mechanism for current limiting by the use of electromagnetic repulsion, aiming at solving a technical problem of improving current-limiting performance by increasing the contact-opening speed of a contact plate of a current-limiting type circuit breaker and realizing the device in a compact size. The current-limiting contact plate is rotatably supported at its central portion, with one end thereof facing a movable contact plate, and with the other end facing a fixed conductor and electrically connected thereto. An electromagnetic repulsive force between the movable contact plate and the current-limiting contact plate and an electromagnetic repulsive force between the fixed conductor and the current-limiting contact plate are used as a couple of forces. It is therefore possible to increase the contact-opening speed and to decrease the distance between the current-limiting contact plate and the fixed conductor. The invention provides a circuit breaker which is small in size and is excellent in breaking performance.
Abstract:
A slot motor (100,200,300) is for an electrical switching apparatus (2). The slot motor includes a support apparatus including a support element (102) having a first leg (104,204) and a second leg (106,206) located opposite the first leg, the first leg having a first inner surface (110), the second leg having a second inner surface (112) facing the first inner surface; a plurality of permanent magnets (180,182,280,282,284,286,380,382) including a first permanent magnet (180,280,380) and a second permanent magnet (182,282,382), the first permanent magnet being located on the first leg, the second permanent magnet being located on the second leg; and a number of U-shaped plates (130,140) coupled to the support element. The first inner surface and the second inner surface are located between the first permanent magnet and the second permanent magnet.
Abstract:
The invention is about an electromagnetic trip device (1) for a circuit breaker, with a current path comprising a conductor (13) guiding an electric current through at least one contact point (2, 3) formed between a fixed and a movable contact piece (4, 6; 7, 8), with a contact lever (8) carrying the at least one movable contact piece (5, 7), the contact lever (8) being mounted to be movable between a closed contact position and an open contact position. The electromagnetic trip device (1) comprises a magnetic circuit (9) with an air-gap (10) and the movable contact lever (8) is at least partially located in the air-gap (10), and that the electric current flows through the contact lever (8) in a direction perpendicular to the orientation of the magnetic flux in the air-gap (10).
Abstract:
A circuit breaker includes fixed and movable contacts, an operating mechanism including a movable arm carrying the movable contact, an arc chute including a plurality of spaced apart first and second arc plates, and a slot motor. A slot motor structure is disposed about the contacts and a portion of the movable arm. An insulative housing at least substantially covers and insulates the slot motor structure from the movable arm and contacts. The inslulative housing includes a base and a pair of arms disposed therefrom. Each of the arms includes a first portion disposed proximate the first arc plates and a second smaller portion disposed proximate the second arc plates. A space extending from the first portion, not occupied by the second portion, is generally occupied by a portion of the second arc plates. The second portion forms a debris shield between the second arc plates and the operating mechanism.