35results about How to "Improve short circuit breaking capacity" patented technology

The invention discloses a surge protection device (100) with a short circuit current protection function. The surge protection device comprises a surge protection module (102) and a short circuit current protection module (101). The surge protection module discharges and inhibits surge current and voltage. The surge protection module is a pluggable module. The short circuit current protection module is integrated in a base. The short circuit current protection module provides short circuit protection and plugging installation for the surge protection module. According to the surge protection device, the problem that an impact current is brought to backup protection by using an external overcurrent protection device is overcome; the current limiting capability is high; the short circuit breaking capacity is high; the minimum instant tripping current value is low; the surge protection device can tolerate a fault mode occurring in transient over voltage TOV; and a protection effect is achieved under a low current.

The invention discloses a framework circuit breaker arc extinguishing chamber, which belongs to low-voltage electric appliance equipment and comprises an arch isolation cover, a grid plate, an arc striking plate, a first arc isolation wall and a second arc isolation wall, wherein the arc isolation cover is fixedly arranged on the top of the first arc isolation wall and the second arc isolation wall, and in order to increase the exhaust area and to simultaneously control the exhaust directions of the arc isolation cover, more than one inclined exhaust hole is processed along the transverse axial line of the arc isolation cover on the premise of ensuring the intensity requirements. Two ends of the grid plate are respectively connected with the inner walls of the first arc isolation wall and the second arc isolation wall and are in staggered placement in the arc extinguishing chamber in a way that one end is positive and the other end is reverse. In order to lengthen the electric arc through pulling, asymmetric grooves are processed in the middle position of the lower end of the grid plate, simultaneously, in order to increase the length of the grid plate, the top of the grid plate uses the condition that the top is not in contact with the inner wall of the arc isolation cover as the limit, the bottom of the grid plate uses the condition that the bottom is not in contact with the inner wall of the arc striking plate as the limit, and the grid plate is in step-type arrangement along the inclined surface of the arc striking plate. In the practical application, after the arc extinguishing chamber in the structure is adopted, the short circuit breaking capability of a circuit breaker is improved from the original 80kA to 120kA.

The invention provides a circuit breaker used in a distribution system, comprising a circuit breaker loop which comprises an overload release, a magnetic release system, a main contact, an auxiliary contact and an operation mechanism, wherein the operation mechanism is used for controlling the closure or cutting off of the main contact and the auxiliary contact under the conditions of the normal working and the overload fault. The circuit breaker also comprises an electronic release accessory loop comprising a selective resistor and an electronic release which are connected in series, wherein the selective resistor and the electronic release are connected with an input circuit part connected to the first electrode of the circuit breaker in series and at least comprising the main contact and the magnetic release system in parallel. Under the condition of a short-circuit fault, the main contact is cut off under the pushing of the magnetic release system so that short-circuit current passes through the auxiliary contact, the selective resistor and the electronic release, the electronic release selectively controls the operation mechanism according to the elimination of the short-circuit fault in the preset delay time, and furthermore, the operation mechanism controls the main contact and the auxiliary contact to carry out corresponding closing or cutting-off operation.

A miniature circuit breaker with double breakpoint current limiting. The problem of poor breaking capacity of the existing miniature circuit breaker is solved. It includes a housing, an operating mechanism, a contact system and an arc extinguishing system. The contact system includes moving contacts and static contacts. The housing includes a front cover and a rear cover. The moving contacts are It includes a first movable contact pin and a second movable contact pin, the static contact is provided with a first static contact piece and a second static contact piece, and the arc extinguishing system includes a first arc extinguishing chamber and a In the second arc extinguishing chamber, a baffle is provided in the housing, and the baffle and the front cover form a first accommodating chamber, and the baffle and the rear cover form a second accommodating chamber. A moving contact foot, the first static contact piece, and the first arc extinguishing chamber are all arranged in the first accommodating cavity, and the second moving contact foot, the second static contact piece, and the second arc extinguishing chamber are all arranged in the second accommodating chamber. Two accommodation chambers. The invention has the advantages of convenient assembly, reliable breaking and arc extinguishing, strong current limiting capability, wide application range and the like.

The invention discloses a neutral pole structure of a small circuit breaker, which includes an incoming line terminal (15) and an outgoing line terminal (14), which are respectively located at two ends of a circuit breaker bottom case (16); an opening and closing operating mechanism, which It includes a moving contact (8) and a static contact (7) for breaking the line; it also includes a circuit board (13), and the two ends of the circuit board (13) are respectively fixedly connected to the bottom case (16) and On the upper cover, which is close to the side wall of the bottom case (16), the board surface of the circuit board (13) is vertically arranged with the bottom case and / or the upper cover; the neutral pole of the circuit breaker is also Including an arc extinguishing chamber (11), the arc extinguishing chamber (11) is placed at the lower part of the bottom case (16), and its arc extinguishing grid extends close to the moving contact (8) and the static contact (7) direction setting. This structure solves the problem that the neutral pole arc extinguishing effect of the miniature circuit breaker in the prior art is poor, resulting in poor short-circuit breaking capacity.

A circuit breaker for motor protection includes a contact support installed in a housing, a static contact assembly and a movable contact assembly mounted on the contact support, and also includes a rotary handle and a linkage mechanism connected with the rotary handle. The linkage mechanism comprises a gear swing rod and a push rod. The rotary handle rotatably drives the linkage mechanism to drive the push rod to make the movable contact group on the contact support come into contact with and separate from the static contact group. One end of the rotary handle is provided with an upper gear intermeshed with the gear swing rod. The upper gear comprises teeth. A tooth groove is formed between every two adjacent teeth. The gear swing rod is provided with swing rod teeth corresponding to the tooth grooves. Swing rod tooth grooves corresponding to the teeth are formed between the swing rod teeth. The teeth gradually narrow from the inside to the outside. First inclined surfaces are formed on both sides, and second inclined surfaces corresponding to the first inclined surfaces are disposed on both sides of the swing rod tooth grooves.

The invention discloses a small breaker. The breaker comprises a plastic shell, a movable contact, a static contact, an operation mechanism, an electromagnetic tripping mechanism, an arc extinguish chamber and a run-on tab, wherein the electromagnetic tripping mechanism comprises a magnetic yoke; one end of the run-on tab is electrically connected with the static contact, while the other end of the run-on tab extends into the arc extinguish chamber; and the arc extinguish chamber is positioned under the magnetic yoke. The small breaker is characterized by comprising an iron arc guide plate; one end of the arc guide plate, namely a fixed end, is fixed on the bottom of the magnetic yoke, while the other end of the arc guide plate, namely an arc guide end, is bent downwards and close to the movable contact. The small breaker has the advantages of effectively improving the capability of short circuit disjunction of the breaker, easily achieving the level of 6,000A energy level 3, and has short arcing time less than 6 milliseconds.

The invention discloses a contact system with an automatic arc blowing function. The system comprises a contact supporter and a movable contact which rotates along with the contact supporter in an integrated manner, wherein the movable contact has a maximum distance of separating brake rotating, a baffle is arranged at the front end, which is suitable for being contact with a fixed contact, of the movable contact in a rotating manner, and the baffle is provided with two side plates and an arc blowing plate which is connected between the two side plates and faces an arc extinguishing chamber; the system further comprises an elastic bias device for applying acting force on the baffle in the direction, opposite to the direction of the separating brake rotating of the movable contact; when the movable contact is rotated to a maximum distance position and stops rotating, under the inertia effect, the baffle overcomes the acting force on the elastic bias device to continuously rotate in the original direction, and arcs are blown by the arc blowing plate to move towards the arc extinguishing chamber. Through the use of the system, the air blowing effect is improved, the short circuit breaking capacity of the contact system is improved, and the baffle is reset under the driving of the elastic bias device. The contact system disclosed by the invention has the advantages that the structure is simple and the operation is reliable.

The invention relates to a small circuit breaker, which comprises a shell (1), an operating mechanism (2), a contact system (3), an arc extinguishing chamber (4), a heat tripping system (5), a sealingsystem (6) and an electromagnetic tripping system (7), wherein the contact system (3) comprises a moving contact (301) and a static contact (302). The small circuit breaker removes an arc running channel region, so that the voltage rising speed of electric arcs is greatly improved, and the short circuit breaking capacity is enhanced. The whole mechanism is great separation distance, the blastingmagnetic field is strong, the structure is simple, and the assembly is convenient.

A surge protector (100) with short-circuit protection function includes a surge protection module (102) and a short-circuit current protection module (101). The surge protection module discharges and suppresses surge current and voltage. The surge protection module is a plug-in module. The short-circuit current protection module is integrated in the base. The short-circuit current protection module provides short-circuit protection and plug-in installation for the surge protection module. This surge protector overcomes the problem of inrush current caused by using an external overcurrent protection device for backup protection. At the same time, it has strong current limiting capability, good short-circuit breaking capability, small minimum instantaneous tripping current value, and can be used under temporary overvoltage (TOV). It can tolerate failure modes and can also play a protective role under low current.