Small leakage protection circuit breaker

Abstract

A small leakage protection circuit breaker, comprising a housing (20), multiple groups of L-wire circuit breaker units (30), and an N-wire leakage protection unit (10), wherein the housing (20) comprises a first middle seat (21), a second middle seat (22), a third middle seat (23), a front cover plate (24), and a rear cover plate (25); the N-wire leakage protection unit (10) comprises a handle (11), a contact holder (12), a lock catch (13), a jump pin (16), a leakage indicator (14), a torsion spring (15), a pull lever (17), a zero-sequence transformer (18), a leakage tripper (19), a trip lever (40), and a reset member (41); an accommodating recess (210) for accommodating the zero-sequence transformer (18) is provided in the first middle seat (21), and the second middle seat (22) and the third middle seat (23) are each provided with a wiring hole (200) in communication with the accommodating recess (210); and a plurality of wires are respectively provided on connection terminals of the plurality of L-wire circuit breaker units (30), and the plurality of wires each have one end sequentially passing through the second middle seat (22), the third middle seat (23), the first middle seat (21) and the zero-sequence transformer (18) and then connected to the leakage tripper (19). The small leakage protection circuit breaker has a simple structure, is stable and reliable in performance, is quick in tripping action and convenient to assemble, and has a small size.

Description

A small leakage protection circuit breaker Technical Field

[0001] The utility model relates to the technical field of circuit breakers, in particular to a small leakage protection circuit breaker. Background Art

[0002] Currently, miniature circuit breakers, also known as miniature circuit breakers, are suitable for overload and short-circuit protection of AC 50 / 60Hz circuits with a rated voltage of 230 / 400V and a rated current not exceeding 125A. They can also be used for infrequent line switching under normal conditions. Miniature circuit breakers are primarily used in various locations, including industrial, commercial, high-rise, and residential buildings. A miniature leakage circuit breaker is a switch that automatically activates when the leakage current in a circuit exceeds a predetermined value, protecting personnel and electrical equipment. A miniature leakage circuit breaker consists of multiple L-line circuit breaker units and an N-line leakage protection module assembled with these L-line circuit breaker units. Existing leakage protection circuit breakers have an unreasonable internal structure and layout, resulting in a large size. The N-line leakage protection module of these miniature leakage circuit breakers also has a complex structural design, resulting in unstable tripping force of the tripping rod, which leads to unreliable tripping performance and insensitive leakage tripping. Summary of the Invention

[0003] The purpose of the utility model is to overcome the defects of the prior art and provide a small leakage protection circuit breaker with simple structure, stable and reliable performance, sensitive tripping action, convenient assembly and small size.

[0004] To achieve the above-mentioned purpose, the present invention adopts a small leakage protection circuit breaker, comprising a shell, a plurality of groups of L-line circuit breaker units respectively arranged in the shell, and an N-line leakage protection unit arranged in the shell, the shell comprising a first middle seat, a second middle seat and a third middle seat respectively stacked, a front cover plate arranged on one side of the first middle seat, and a rear cover plate arranged on one side of the third middle seat, a plurality of circuit breaker accommodating cavities for accommodating a plurality of groups of L-line circuit breaker units are formed between the second middle seat and the first middle seat and the third middle seat, and between the third middle seat and the rear cover plate, a leakage protection accommodating cavity for accommodating the N-line leakage protection unit is formed between the first middle seat and the front cover plate, and the N-line leakage protection unit comprises a rotatable arrangement on the first middle seat and connected to the plurality of L The operating handle of the line circuit breaker unit is linked to the handle, a contact frame, a lock rotatably arranged on the contact frame, a tripping buckle rotatably arranged on the contact frame and matched with the lock, a leakage indicator rotatably arranged on the contact frame, a torsion spring arranged between the lock and the leakage indicator, a pull rod arranged between the tripping buckle and the handle, a zero-sequence transformer, a leakage release arranged in the first middle seat, a tripping rod linked to the top rod of the leakage release, and a reset member arranged between the tripping rod and the lock. The first middle seat is provided with a accommodating groove for placing the zero-sequence transformer, and the second and third middle seats are respectively provided with wiring holes connected to the accommodating groove. The wiring terminals of the multiple L-line circuit breaker units are respectively provided with multiple wires, and one end of the multiple wires passes through the second middle seat, the third middle seat, the first middle seat, and the zero-sequence transformer in sequence and is connected to the leakage release.

[0005] The above structure has the following advantages: the housing is assembled from the first, second, and third middle bases, along with the front and rear covers, forming independent cavities for the circuit breaker unit and the leakage protection circuit breaker, ensuring more reliable insulation performance. The zero-sequence transformer is located within the accommodating slot of the first middle base, creating a more rational structural layout and reducing the size of the miniature circuit breaker. Wiring holes are provided on the first and second middle bases, facilitating the connection of the leakage protection circuit breaker to multiple groups of circuit breaker units and improving wiring efficiency. Furthermore, the N-line leakage protection circuit breaker utilizes a connecting rod design with the tripping rod, reset element, locking catch, and tripping catch, ensuring even distribution of the tripping torque of the leakage protection module and more reliable tripping force. Consequently, this miniature leakage protection circuit breaker offers the advantages of a simple structure, stable and reliable performance, sensitive tripping action, easy assembly, and a compact size.

[0006] In particular, one end of the reset member has a curved raised portion that mates with the trip rod. The trip rod moves with the top rod of the residual current release and abuts against the curved raised portion, forming a linkage between the reset member and the trip rod. The other end of the reset member has a load-bearing inclined surface that mates with the lock catch. One end of the lock catch is provided with a curved boss that abuts against the load-bearing inclined surface. The reset member is provided with a curved raised portion that mates with the trip rod, and the trip rod abuts against the curved raised portion, ensuring that the trip rod can reliably drive the reset member. The load-bearing inclined surface of the reset member abuts against the curved boss of the reset member, thereby ensuring more reliable transmission and more flexible operation between the reset member, the trip member, and the lock catch.

[0007] Specifically, the leakage indicator has a pivot hole at one end, into which the pin of the contact frame is inserted, forming a rotatable connection between the leakage indicator and the pin. A red indicator piece extends from the contact frame at one end, and a leakage indicator hole is provided on the first middle seat corresponding to the red indicator piece. The leakage indicator is rotatably mounted on the pin of the contact frame, thereby facilitating easier assembly of the leakage indicator with the contact frame, ensuring flexible operation of the leakage indicator, and providing more reliable leakage indication.

[0008] Specifically, one side of the trip lever is provided with a driving surface that mates with the curved raised portion, while the other side of the trip lever is provided with a linkage surface that contacts the top rod of the residual current release. The contact between the driving surface of the trip lever and the curved raised portion of the reset member prevents any jamming or blocking between the driving surface and the curved raised portion, thereby ensuring that the trip lever can reliably actuate the reset member and providing more flexible transmission between the trip lever and the reset member.

[0009] Specifically, the trip lever has a positioning hole at one end, and a positioning shaft is disposed within the first center seat to engage with the positioning hole. The positioning shaft is inserted into the positioning hole and forms a rotational connection between the trip lever and the positioning shaft. The trip lever is rotatably mounted on the positioning shaft of the first center seat, thereby facilitating assembly of the trip lever and the first center seat and improving assembly efficiency.

[0010] Specifically, the reset member is provided with a positioning shaft hole in its central portion, and a positioning shaft is provided within the first intermediate seat, which is inserted into the positioning shaft hole and forms a rotational connection between the reset member and the positioning shaft. The reset member is rotatably mounted on the positioning shaft of the first intermediate seat, thereby facilitating assembly of the reset member and the first intermediate seat, improving assembly efficiency, and ensuring that the reset member can rotate reliably within the first intermediate seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] FIG1 is a perspective view of an embodiment of the present utility model.

[0012] FIG2 is a diagram showing the internal structure of an embodiment of the present utility model.

[0013] FIG3 is a front view of the internal structure of an embodiment of the utility model.

[0014] FIG4 is an assembly diagram of the front cover and the N-line leakage protection unit according to an embodiment of the present invention. DETAILED DESCRIPTION

[0015] As shown in Figures 1 to 4, an embodiment of the present invention is a small leakage protection circuit breaker, comprising a housing 20, a plurality of groups of L-line circuit breaker units 30 respectively arranged in the housing 20, and an N-line leakage protection unit 10 arranged in the housing 20. The housing 20 comprises a first middle seat 21, a second middle seat 22, and a third middle seat 23 respectively stacked, a front cover 24 arranged on one side of the first middle seat 21, and a rear cover 25 arranged on one side of the third middle seat 23. A plurality of circuit breaker accommodating cavities for accommodating the plurality of groups of L-line circuit breaker units 30 are formed between the second middle seat 22 and the first middle seat 21 and the third middle seat 23, and between the third middle seat 23 and the rear cover 25. A leakage protection accommodating cavity 200 for accommodating the N-line leakage protection unit 10 is formed between the first middle seat 21 and the front cover 24. The N-line leakage protection unit 10 comprises a first middle seat 21 rotatably arranged and rotatably engaged with the plurality of L-line circuit breaker units 30. The operating handle of the circuit breaker unit 30 is linked with the handle 11, the contact frame 12, the lock 13 rotatably arranged on the contact frame 12, the tripping buckle 16 rotatably arranged on the contact frame 12 and matched with the lock 13, the leakage indicator 14 rotatably arranged on the contact frame 12, the torsion spring 15 arranged between the lock 13 and the leakage indicator 14, the pull rod 17 arranged between the tripping buckle 16 and the handle 11, the zero-sequence transformer 18, the leakage trip device 19 arranged in the first middle seat 21, the tripping rod 40 linked with the top rod 191 of the leakage tripping device 19, and the reset member 41 arranged between the tripping rod 40 and the lock 13. The first middle seat 21 is provided with a receiving groove 210 for placing the zero-sequence transformer 18, and the second middle seat 22 and the third middle seat 23 are respectively provided with wiring holes 200 connected to the receiving groove 210. The wiring terminals of the circuit breaker unit 30 are each provided with multiple wires. One end of each wire passes through the second middle seat 22, the third middle seat 23, the first middle seat 21, and the zero-sequence transformer 18, and is connected to the residual current release 19. The reset member 41 has an arcuate raised portion 411 on one end that mates with the trip rod 40. The trip rod 40 moves in conjunction with the top rod 191 of the residual current release 19 and abuts against the arcuate raised portion 411, forming a coordinated engagement between the reset member 41 and the trip rod 40. The other end of the reset member 41 has a load-bearing inclined surface 412 that mates with the lock catch 13. The lock catch has an arcuate boss on one end that abuts against the load-bearing inclined surface.The reset element is equipped with a curved raised portion that mates with the trip lever. The trip lever abuts against the curved raised portion, ensuring that the trip lever reliably actuates the reset element. The reset element's load-bearing inclined surface abuts against the reset element's curved boss, thereby ensuring more reliable and flexible transmission between the reset element, the trip element, and the lock catch. The trip lever 40 is provided with a driving surface 401 on one side that mates with the curved raised portion 411. On the other side, the trip lever 40 is provided with a linkage surface 402 that abuts against the top rod 191 of the residual current release 19. The contact between the driving surface of the trip lever and the curved raised portion of the reset element prevents any jamming or blocking between the driving surface and the curved raised portion, ensuring that the trip lever reliably actuates the reset element and providing more flexible transmission between the trip lever and the reset element. The leakage indicator 14 has a shaft hole 141 at one end. The pin 121 of the contact frame 12 is inserted into the hole 141, forming a rotational connection between the leakage indicator 14 and the pin 121. A red indicator piece 142 extends from the contact frame 14 at one end of the leakage indicator 14. A leakage indicator hole 211 is provided on the first center seat 21 corresponding to the red indicator piece 142. The leakage indicator is rotatably mounted on the pin of the contact frame, ensuring easier assembly of the leakage indicator with the contact frame, flexible operation of the leakage indicator, and more reliable leakage indication.

[0016] As shown in Figures 2 and 3, the trip rod 40 has a positioning hole 403 at one end. A positioning shaft 212 is provided within the first center seat 21, which mates with the positioning hole 403. The positioning shaft 212 is inserted into the positioning hole 403, forming a rotational connection between the trip rod 40 and the positioning shaft 212. The trip rod is rotatably mounted on the positioning shaft of the first center seat, facilitating assembly of the trip rod with the first center seat and improving assembly efficiency. The reset member 41 has a positioning shaft hole 413 at its center. A positioning shaft 213 is provided within the first center seat 21, which inserts into the positioning shaft hole 413 and forms a rotational connection between the reset member 41 and the positioning shaft 213. The reset member is rotatably mounted on the positioning shaft of the first center seat, facilitating assembly of the reset member with the first center seat, improving assembly efficiency, and ensuring reliable rotation of the reset member within the first center seat.

[0017] The housing is assembled from the first, second, and third middle blocks, along with the front and rear covers, forming independent cavities for the circuit breaker unit and the leakage protection circuit breaker, ensuring reliable insulation performance. The zero-sequence transformer is housed within the first middle block, creating a more rational layout and reducing the size of the miniature circuit breaker. Wiring holes are provided on the first and second middle blocks, facilitating wiring of the leakage protection circuit breaker to multiple circuit breaker units and improving wiring efficiency. The N-line leakage protection circuit breaker utilizes a connecting rod design with the tripping rod, reset element, locking catch, and tripping catch, ensuring even distribution of the leakage protection module's tripping torque and ensuring a more reliable tripping force. This miniature leakage protection circuit breaker offers the advantages of a simple structure, stable and reliable performance, sensitive tripping action, easy assembly, and a compact size.

Claims

1. A small leakage protection circuit breaker, comprising a shell, a plurality of groups of L-line circuit breaker units respectively arranged in the shell, and an N-line leakage protection unit arranged in the shell, wherein the shell comprises a first middle seat, a second middle seat and a third middle seat respectively arranged in a superimposed manner, a front cover plate arranged on one side of the first middle seat, and a rear cover plate arranged on one side of the third middle seat, a plurality of circuit breaker accommodating cavities for accommodating a plurality of groups of L-line circuit breaker units are formed between the second middle seat and the first middle seat and the third middle seat, and between the third middle seat and the rear cover plate, a leakage protection accommodating cavity for accommodating an N-line leakage protection unit is formed between the first middle seat and the front cover plate, and the N-line leakage protection unit comprises a first middle seat rotatably arranged and rotatably connected to the plurality of L-line circuit breaker units. The operating handle of the line circuit breaker unit is linked with the handle, the contact frame, the lock rotatably arranged on the contact frame, the tripping buckle rotatably arranged on the contact frame and matched with the lock, the leakage indicator rotatably arranged on the contact frame, the torsion spring arranged between the lock and the leakage indicator, the pull rod arranged between the tripping buckle and the handle, the zero-sequence transformer, the leakage releaser arranged in the first middle seat, the tripping rod linked with the top rod of the leakage release, and the reset member arranged between the tripping rod and the lock. The first middle seat is provided with a accommodating groove for placing the zero-sequence transformer, the second middle seat and the third middle seat are respectively provided with wiring holes connected with the accommodating groove, and the wiring terminals of the multiple L-line circuit breaker units are respectively provided with multiple wires, and one end of the multiple wires passes through the second middle seat, the third middle seat, the first middle seat, and the zero-sequence transformer in sequence and is connected to the leakage releaser.

2. The miniature leakage protective circuit breaker according to claim 1, characterized in that: One end of the reset member has an arc-shaped raised portion that matches the trip rod. The trip rod moves with the top rod of the leakage release and abuts against the arc-shaped raised portion, thereby forming a linkage cooperation between the reset member and the trip rod. The other end of the reset member has a load-bearing inclined surface that matches the lock buckle, and one end of the lock buckle is provided with an arc-shaped boss that abuts against the load-bearing inclined surface.

3. The miniature residual current operated circuit breaker according to claim 1 or 2, characterized in that: A rotating shaft hole is provided at one end of the leakage indicator, and the pin shaft of the contact frame is inserted into the rotating shaft hole to form a rotating connection between the leakage indicator and the pin shaft. One end of the leakage indicator has a red indicator piece extending on the contact frame, and a leakage indication hole is provided on the first middle seat corresponding to the red indicator piece.

4. The miniature residual current operated circuit breaker according to claim 1 or 2, characterized in that: A driving plane matched with the arc-surface protrusion is arranged on one side of the tripping rod, and a linkage plane abutting against the top rod of the leakage release is arranged on the other side of the tripping rod.

5. The miniature leakage protection circuit breaker according to claim 1 or 2, characterized in that: One end of the tripping rod is provided with a positioning hole, and a positioning shaft matching the positioning hole is arranged in the first middle seat. The positioning shaft is inserted into the positioning hole and constitutes a rotational connection between the tripping rod and the positioning shaft.

6. The miniature residual current operated circuit breaker according to claim 1 or 2, characterized in that: A positioning shaft hole is arranged on the middle part of the reset member, and a positioning shaft inserted into the positioning shaft hole is arranged in the first middle seat, so as to form a rotational connection cooperation between the reset member and the positioning shaft.

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