Abstract

Disclosed is a circuit breaker (100), comprising a moving contact (21), a fixed contact (22), a spindle (34) and an operating mechanism (30). The moving contact (21) can rotate, relative to the fixed contact (22), around a centre of rotation (0) of the spindle (34). Turning on or breaking of a circuit is realised by means of contact or disconnection between the moving contact (21) and the fixed contact (22). The operating mechanism (30) comprises an upper connecting rod (32), a lower connecting rod (33) and a handle (311). The upper connecting rod (32) is arranged in such a manner that same can rotate around one end of the upper connecting rod (32) under the driving action of the handle (311), and the other end of the upper connecting rod (32) is rotatably connected to one end of the lower connecting rod (33) by means of a connecting rod articulated shaft (36), so that the other end of the lower connecting rod (33) is articulated to the spindle (34) and can drive the spindle (34) to drive the moving contact (21) to rotate, wherein the working length of the upper connecting rod (32) and the working length of the lower connecting rod (33) as well as the working length of the upper connecting rod (32) and a distance from a point (A), where the lower connecting rod (33) and the spindle (34) are articulated, to the centre of rotation (0) of the spindle (34) have a pre-determined proportional relationship, so that an angle of rotation, formed after the moving contact (21) is disconnected from the fixed contact (22), of the moving contact (21) is greater than 30 degrees. Thus, the purpose of improving the breaking capacity of the circuit breaker (100) is realised.

IPC Classes  ?

• H01H 71/12 - Automatic release mechanisms with or without manual release
• H01H 3/46 - Driving mechanisms, i.e. for transmitting driving force to the contacts using rod or lever linkage, e.g. toggle

Abstract

The present invention provides an isolating switch and a power distribution system. The isolating switch comprises: a housing provided with a first port through which a first wire passes and a second port through which a second wire passes; and a contact mechanism, which is connected with the first wire and with the second wire respectively, and is used for controlling the first wire and the second wire to be turned on or off, and is characterized in that the first port and the second port are located on the same side of the housing. The purpose of simplifying the wiring structure of the isolating switch and limiting the space occupied by the isolating switch is achieved.

IPC Classes  ?

• H01H 71/02 - HousingsCasingsBasesMountings
• H01H 71/08 - TerminalsConnections

Abstract

A breaker comprises a static contact, a moving contact, and an arc-extinguishing chamber. A contact surface of an electrical contact of the static contact and an electrical contact of the moving contact and a bottom plane of a base form an acute angle that is located in the first quadrant. The moving contact comprises a conducting rod having a projecting portion, and the electrical contact which is welded on an end surface of the projecting portion in a direction facing the electrical contact of the static contact. A bottom arc-ignition grid plate on the bottom of the arc-extinguishing chamber is arranged lower than the electrical contact of the static contact. A top arc-ignition grid plate on the top of the arc-extinguishing chamber is arranged higher than the maximum position of the electrical contact of the moving contact when the moving contact is opened.

IPC Classes  ?

• H01H 73/04 - Contacts
• H01H 73/18 - Means for extinguishing or suppressing arc
• H01H 33/76 - Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid wherein arc-extinguishing gas is evolved from stationary partsSelection of material therefor

Abstract

Provided are a contact system (10) in a low-voltage switch, and a low-voltage switch (1). The contact system comprises a bifurcated contact (20) and a movable contact (30). The bifurcated contact has an upper bifurcated end (202a-1) and a lower bifurcated end (202a-2). Electrical contact parts (204a, 206a) are respectively arranged on insides of the upper bifurcated end and the lower bifurcated end. Electrical contact parts (304,306) are respectively arranged on an upper and lower surface of an execution end of the movable contact corresponding to the electrical contact parts of the bifurcated contact. When the contact system is switched on and powered up, electrodynamic repulsive forces produced at the electrical contact parts of the bifurcated contact are offset, so that the contact system can stably maintain an on-state, thereby improving a short-time current withstand capability of a low-voltage switch using the contact system.

IPC Classes  ?

• H01H 1/06 - Contacts characterised by the shape or structure of the contact-making surface, e.g. grooved
• H01H 1/58 - Electric connections to or between contactsTerminals

Abstract

A circuit breaker, comprising a stationary contact (7) and a base (10), wherein the stationary contact (7) comprises a contact part (714) and a cascade part (712), wherein the stationary contact (7) is fixedly arranged on the base (10); the contact part (714) is positioned on an upper side of the base (10); and the cascade part (712) is positioned on a lower side of the base (10), such that the circuit breaker realizes a double-layer structure. The double-layer cascade structure of the circuit breaker can reduce contact resistance, a cascade point which is most beneficial to a conductive loop is selected, the designed cascade function can be ensured under the condition of short circuit; and the cascade mode can improve the insulation level and enable outline dimensions of the circuit breaker to be smaller.

IPC Classes  ?

• H01H 73/04 - Contacts
• H01H 73/18 - Means for extinguishing or suppressing arc

Abstract

A plastic outer casing-type current acquisition module for a photovoltaic combiner box. The plastic outer casing-type current acquisition module comprises at least one combiner bar, at least one docking bar, a plurality of current acquisition units and an MCU processing circuit. The current acquisition units are respectively and independently perpendicular to the docking bars and are movably installed between the combiner bar and the docking bars. The MCU processing circuit is movably connected to the current acquisition units using connectors. A current acquisition circuit may be connected to or disconnected from the MCU processing circuit via plug-in means. The MCU processing circuit automatically detects and identifies whether the connections between the MCU processing circuit and the various current acquisition units are disconnected. A signal interface on an MCU processing circuit board outputs current measurement values of various photovoltaic module strings in the form of digital signals via bus means. The current acquisition module constructs a direct current combiner system having any number of loops within the range of not exceeding 16 photovoltaic module string columns according to an application environment and user requirements, has features such as small size, convenience, strong flexibility and easy maintenance, and automatically detects plug-in connection failure. In addition, rapid replacement and maintenance may be performed when a branch circuit fails.

IPC Classes  ?

• G01R 19/25 - Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques

Abstract

A photovoltaic combiner box. A plurality of sets of protective electrical devices, at least one multi-loop current detection module, at least one lightening protection device module, at least one direct current isolation switch or direct current moulded case circuit breaker, at least one power source module, at least one controller module, a ground terminal and a communication terminal are arranged in an enclosed box. Each set of protective electrical devices is screw-fastened to the current detection module via docking means. The power source module and the controller module are vertically superposed. The power source module is located below the controller module, and the two are connected via connectors, forming a power source/controller combination module. The power source/controller combination module is arranged above the protective electrical devices and the current detection module. The photovoltaic combiner box has a full range of functions, has a modular design, good maintainability and low maintenance costs, and is convenient to repair. Via the combined arrangement of the controller module and the power source module, box body size is small, construction costs are low and installation space is relatively small.

IPC Classes  ?

• H02S 40/34 - Electrical components comprising specially adapted electrical connection means to be structurally associated with the PV module, e.g. junction boxes

Abstract

A breaker facilitating rapid movement and elongation of an arc comprises a static contact (1), a moving contact (3), and an arc-extinguishing chamber (2). A contact surface (14) of an electrical contact (13) of the static contact and an electrical contact (32) of the moving contact and a bottom plane (4) of a base form an acute angle that is located in the first quadrant. The moving contact comprises a conducting rod (31) and the electrical contact. The conducting rod has a projecting portion (314). The electrical contact is welded on an end surface of the projecting portion in a direction facing the electrical contact of the static contact. The arc-extinguishing chamber is a grid-plate arc-extinguishing chamber. The bottom and the top of the arc-extinguishing chamber are respectively provided with arc-ignition grid plates (24, 22). The arc-ignition grid plate on the bottom of the arc-extinguishing chamber is arranged lower than the electrical contact of the static contact. The arc-ignition grid plate on the top of the arc-extinguishing chamber is arranged higher than the maximum position of the electrical contact of the moving contact when the moving contact is opened. The breaker facilitates rapid movement and elongation of the arc generated on the electrical contacts of the moving contact and the static contact when the moving contact is opened. By means of the breaker, the arc moving speed and the arc drawing length of the breaker can be effectively improved without changing the operating mechanism and the housing of an existing breaker. When the breaker is applied in a photovoltaic direct current breaker, the working voltage of the breaker can be raised, and the problems of large volume and high power consumption can be solved.

IPC Classes  ?

• H01H 73/18 - Means for extinguishing or suppressing arc
• H01H 73/04 - Contacts

Abstract

A fuse protector with multiple fuses comprises a fuse protector base (101), a fuse carrier (102), and fuse elements. The fuse elements are disposed on the fuse carrier (102), and the fuse carrier (102) is inserted in the fuse protector base (101). One side of the fuse protector base (101) is provided with at least two wiring assemblies, and another side of the fuse protector base (101) is provided with at least two wiring assemblies. The fuse protector base (101) is further provided with base contacts (203) corresponding to the wiring assemblies. The fuse carrier (102) is inserted in the fuse protector base (101). When the fuse carrier (102) is pulled out of the fuse protector base (101), at least four fractures are formed at the same time, and the voltage of an arc is distributed to the four contacts. Therefore, the voltage of the arc is effectively reduced, space is saved, and the fuse protector can work with a Hall module and a current leakage module more conveniently.

IPC Classes  ?

• H01H 85/12 - Two or more separate fusible members in parallel

Abstract

A movable contact device for a relay includes a movable contact body (1).The movable contact body has a strip-sheet structure. The front end of the movable contact body is connected with a flexible non-ferrous metal wire (2). A fulcrum is provided between the middle part and the back end of the movable contact body. A bearing structure driven by an external force is provided on the front part or the back part of the fulcrum, so as to enable the movable contact body to rotate around the fulcrum. The movable contact device for a relay has the advantages of a simple structure and a high current carrying capacity.

IPC Classes  ?

• H01H 50/54 - Contact arrangements