CN116344273A

CN116344273A - Residual current operated circuit breaker

Info

Publication number: CN116344273A
Application number: CN202111595208.9A
Authority: CN
Inventors: 单小龙; 葛伟骏; 雷广
Original assignee: Shanghai Chint Intelligent Technology Co Ltd
Current assignee: Shanghai Chint Intelligent Technology Co Ltd
Priority date: 2021-12-23
Filing date: 2021-12-23
Publication date: 2023-06-27
Also published as: WO2023116146A1; KR20240121659A; EP4318531A1; AU2022422516A1

Abstract

The invention relates to the field of low voltage electricity, in particular to a residual current operated circuit breaker, which comprises a first region, a second region, a third region and a fourth region on a projection perpendicular to the width direction of a circuit breaker shell; the residual current operated circuit breaker further comprises an operating mechanism and a leakage test mechanism which are arranged in the first area, a short-circuit instantaneous tripping mechanism, an L-pole contact system and an N-pole contact system which are arranged in the second area, an arc extinguishing system which is arranged in the third area, an overload tripping mechanism which comprises a bimetallic strip and is arranged in the fourth area, and a zero sequence current transformer and a magnetic flux tripper which are arranged in the fifth area; the L-pole contact system and the N-pole contact system are arranged side by side along the width direction of the breaker shell; the zero sequence current transformer and the magnetic flux release are arranged side by side along the length direction of the breaker shell and are respectively opposite to the second area and the third area; the residual current operated circuit breaker is reasonable in internal layout and compact in structure.

Description

Residual current operated circuit breaker

Technical Field

The invention relates to the field of low-voltage electricity, in particular to a residual current operated circuit breaker.

Background

The residual current circuit breaker with the action function irrelevant to the power supply voltage directly drives the magnetic flux release to act by utilizing residual current, so as to further push the tripping mechanism of the circuit breaker to trip to break a circuit, a zero sequence current transformer for inducing the residual current and the magnetic flux release directly driven by the residual current are required to be arranged in a product structure, and the two parts occupy a large space, so that miniaturization of the product is difficult to realize.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a residual current operated circuit breaker which is reasonable in internal layout and compact in structure.

In order to achieve the above purpose, the invention adopts the following technical scheme:

a residual current operated circuit breaker comprising a circuit breaker housing including a first region, a second region, a third region, a fourth region and a fifth region disposed therein on a projection perpendicular to a width direction of the circuit breaker housing; the residual current operated circuit breaker further comprises an operating mechanism and a leakage test mechanism which are arranged in a first area, a short-circuit instantaneous tripping mechanism, an L-pole contact system and an N-pole contact system which are arranged in a second area, an arc extinguishing system which is arranged in a third area, an overload tripping mechanism which comprises a bimetallic strip and is arranged in a fourth area, and a zero sequence current transformer and a magnetic flux trip which are arranged in a fifth area; the L-pole contact system and the N-pole contact system are arranged side by side along the width direction of the breaker shell; the zero sequence current transformer and the magnetic flux release are arranged side by side along the length direction of the breaker shell and are respectively opposite to the second area and the third area.

Preferably, the first region, the second region and the third region are sequentially arranged along the length direction of the breaker housing and are positioned at one end of the breaker housing in the height direction, and the fourth region and the fifth region are positioned at the other end of the breaker housing in the height direction; the second area and the third area are arranged side by side with the fifth area along the height direction of the breaker shell; the first area, the second area and the fourth area are arranged side by side along the height direction of the breaker shell; a portion of the fourth region is located between the second region and the fifth region; the zero sequence current transformer and the magnetic flux release are respectively arranged opposite to the second area and the third area.

Preferably, the fourth area is an L-shaped structure, one end of the fourth area is located between the second area and the fifth area, and the other end of the fourth area and the fifth area are arranged side by side along the length direction of the circuit breaker housing.

Preferably, the operating mechanism comprises a handle, a jump buckle piece, a lock buckle piece, a lever, a first connecting rod and a second connecting rod which are respectively arranged on the breaker shell in a rotating way; one end of the first connecting rod is hinged with the handle, the other end of the first connecting rod is hinged with one end of the second connecting rod and is inserted into a waist-shaped hole of the jump fastener in a sliding manner, the other end of the second connecting rod is hinged with the lever, the lever is respectively connected with an N pole moving contact of an N pole contact system and an L pole moving contact of an L pole contact system in a driving manner, the jump fastener is in snap fit with a locking piece, and the locking piece is driven by a short-circuit instantaneous tripping mechanism, an overload protection mechanism or a magnetic flux tripping device to rotate so as to release the snap fit with the jump fastener, so that the operating mechanism trips.

Preferably, the residual current operated circuit breaker further comprises a first partition board, and the short-circuit instantaneous tripping mechanism, the L-pole contact system and the arc extinguishing system and the N-pole contact system are respectively positioned at two sides of the first partition board;

the lever comprises a lever partition, the L-pole moving contact and the N-pole moving contact are respectively positioned at two sides of the lever partition, the lever partition is staggered and overlapped with a first partition, and the first partition at least partially stretches into the space between the L-pole moving contact and the N-pole moving contact; the L-pole moving contact and the N-pole moving contact always keep at least partially overlapped with the insulating partition plate when moving along with the lever.

Preferably, the short circuit instantaneous tripping mechanism is directly in driving fit with the locking piece; the operating mechanism further comprises a transmission rod, one end of the transmission rod is hinged with the locking piece, and the other end of the transmission rod is in driving fit with the bimetallic strip and the magnetic flux release respectively.

Preferably, one end of the locking piece is rotatably arranged on the circuit breaker shell, the other end of the locking piece is provided with a driven surface and a knocking part, the driven surface is in driving fit with the short circuit instantaneous tripping mechanism, and the knocking part is in driving fit with an L pole moving contact of the L pole contact system; when the driven surface is struck by the short circuit instantaneous tripping mechanism to rotate the locking piece, the striking part strikes the L-pole moving contact to break the L-pole moving contact from the L-pole fixed contact of the L-pole contact system.

Preferably, the leakage test mechanism comprises a test button, a switch torsion spring and a matched conductive structure, wherein the switch torsion spring and the matched conductive structure are sequentially connected in series between an L pole circuit and an N pole circuit of the residual current operated circuit breaker, the test button, the switch torsion spring and the matched conductive structure are all positioned on one side of a handle of the operating mechanism, and the test button and the handle are arranged side by side along the height direction of the circuit breaker shell.

Preferably, the two ends of the switch torsion spring are respectively provided with a switch arm and a connecting arm, the switch arm is in driving fit with the test button, the connecting arm is fixedly arranged, the matched conductive structure comprises a matched torsion spring, the two ends of the matched torsion spring are respectively provided with a matched arm and a fixed arm, the matched arm is in driving fit with the operating mechanism, and the fixed arm is fixedly arranged; the short circuit instantaneous tripping mechanism is an electromagnetic tripping device and comprises a magnetic yoke and a coil assembly, wherein the magnetic yoke is electrically connected with the L-pole contact system; the circuit breaker is in a brake-separating state, and the matching arm is disconnected with the magnetic yoke; when the breaker is switched from a switching-off state to a switching-on state, the operating mechanism drives the matching arm to be conducted with the magnetic yoke; the switch arm and the matched conductive structure are kept in a normally open state, and the test button is pressed to drive the switch arm to be in contact conduction with the matched conductive structure.

Preferably, the residual current operated circuit breaker further comprises an anti-misoperation device arranged in the first area, wherein the anti-misoperation device comprises a limiting structure capable of being switched between a first position and a second position; when the handle of the residual current operated circuit breaker is positioned at the opening position, the handle is in limiting fit with the limiting structure to limit the limiting structure at a first position, and the limiting structure prevents a test button of the leakage test mechanism from being pressed to a test position; when the circuit breaker is in a closing state, the external force presses the test button to a test position, the limiting structure moves to a second position, and the handle is prevented from rotating to a breaking position.

Preferably, after the test button is released and reset, the limiting structure is driven by the handle to reset from the second position to the first position, and the handle rotates to the opening position.

Preferably, the two ends of the bimetallic strip are respectively a double-gold mounting end and a double-gold matching end, the double-gold mounting end is opposite to the first area, and the double-gold matching end is positioned between the second area and the fifth area and is in driving fit with the operating mechanism.

Preferably, the overload protection mechanism further comprises an adjusting structure, the adjusting structure comprises an adjusting screw, an adjusting nut and an insulating adjusting button, the adjusting nut is fixedly arranged, the adjusting screw is in threaded fit with the adjusting nut, one end of the adjusting screw is matched with the bimetallic strip, and the other end of the adjusting screw is matched with the insulating adjusting button and synchronously rotates with the insulating adjusting button.

Preferably, the residual current operated circuit breaker further comprises a second partition plate and a double-gold support piece, wherein the second partition plate and the double-gold support piece are arranged in the fourth area, the double-gold mounting end is arranged on the double-gold support piece, the double-gold support piece is fixed between the second partition plate and the circuit breaker shell, the adjusting nut is fixed on the second partition plate, and the insulating adjusting button is rotatably arranged on the second partition plate around the axis of the insulating adjusting button.

Preferably, the first partition board comprises an air passage arranged at one side of the first partition board, the air passage is a labyrinth type air passage and comprises at least two reverse bending passages, one end of the air passage is in opposite fit with the N-pole contact system, and at least one air outlet is arranged at the other end of the air passage.

Preferably, the residual current operated circuit breaker further comprises a circuit board arranged in the fifth area, and the circuit board, the magnetic flux release and the zero sequence current transformer are sequentially arranged side by side along the length direction of the circuit breaker shell.

Preferably, the residual current operated circuit breaker further includes a shield case and an L-pole power feeding wiring board provided in the fifth region, and an L-pole striking plate provided in the third region.

Preferably, the L-pole arc striking plate and the L-pole electric outlet wiring plate are respectively positioned at two sides of the magnetic flux release, and the L-pole arc striking plate is electrically connected with the L-pole electric inlet wiring plate through a first wire; the shielding cover comprises a shielding cover top plate and a shielding cover back plate, wherein the shielding cover top plate is positioned between the zero sequence current transformer and the magnetic flux release, and the shielding cover back plate is positioned between the first lead and the magnetic flux release.

Preferably, the residual current operated circuit breaker further comprises a magnetic flux release reset structure, wherein the magnetic flux release reset structure comprises a deflector rod and a push rod which are respectively rotatably arranged on the circuit breaker shell, and a reset spring.

Preferably, when the magnetic flux release acts, the ejector rod of the magnetic flux release is ejected to drive the ejector rod to rotate, and the ejector rod drives the operating mechanism to release; after the residual current operated circuit breaker is tripped and disconnected due to the action of the magnetic flux tripper, the reset spring drives the deflector rod to rotate, and meanwhile, the deflector rod drives the push rod to rotate in the reset direction of the push rod; when the residual current operated circuit breaker is switched on, the operating mechanism drives the deflector rod to rotate so as to separate the deflector rod from the push rod.

The residual current operated circuit breaker optimizes the space distribution of each component part, ensures reasonable and compact internal layout, is beneficial to miniaturization of products, and realizes the residual current circuit breaker function with the action function irrelevant to the power supply voltage in a limited space (for example, a space with the width of 18 mm).

In addition, the operating mechanism is a cam-five-bar mechanism, the whole structure is compact, and the occupied space for the movement of the whole parts in different states is small, so that the internal space of the circuit breaker shell is further saved; and the tripping mechanism and the operating mechanism which are formed by the tripping element and the locking element are separate and independent mechanisms, and when the operating mechanism executes normal closing or opening operation, the tripping mechanism is in a static state, so that the integral reliability of the operating mechanism is ensured.

Drawings

FIG. 1 is a schematic view of a projected structure of a residual current operated circuit breaker according to the present invention;

fig. 2 is a schematic diagram of an explosion structure of the residual current operated circuit breaker according to the present invention;

FIG. 3a is a schematic diagram of a portion of a residual current operated circuit breaker in a closed state according to the present invention, showing an anti-false touch device and a leakage test mechanism;

fig. 3b is a schematic structural diagram of an anti-false touch device after the residual current operated circuit breaker is tripped and opened, the limiting structure is in a second position, and the handle is between the opening position and the closing position;

fig. 4a is a schematic diagram of the coordination structure of the overload protection mechanism, the magnetic flux release reset structure and the operation mechanism when the residual current operated circuit breaker is in the opening state;

fig. 4b is a schematic diagram of a cooperation structure of the magnetic flux release and the magnetic flux release reset structure when the residual current operated circuit breaker is in a closing state;

FIG. 5a is a schematic view of the cooperation structure of the partition and the lever according to the present invention;

FIG. 5b is a schematic diagram of the mating structure of the spacer and lever of the present invention showing the N-pole contact system and the air passages of the spacer;

FIG. 6 is a schematic view of the structure of the contact system of the present invention;

FIG. 7 is a schematic diagram of the structure of the flux trip, shield, circuit board, zero sequence current transformer, L pole strike plate of the present invention;

fig. 8 is a schematic structural view of the locking element of the present invention.

Detailed Description

Embodiments of the residual current operated circuit breaker according to the present invention are further described below with reference to the examples given in connection with fig. 1-8. The residual current operated circuit breaker of the present invention is not limited to the description of the following embodiments.

As shown in fig. 1, the residual current operated circuit breaker of the present invention includes a circuit breaker housing 1, the circuit breaker housing 1 including a first area A1, a second area A2, a third area A3, a fourth area A4, and a fifth area A5 disposed therein on a projection perpendicular to a width direction of the circuit breaker housing 1; the residual current operated circuit breaker further comprises an operating mechanism 5 and a leakage test mechanism which are arranged in a first area A1, a short-circuit instantaneous tripping mechanism 3, an L-pole contact system and an N-pole contact system which are arranged in a second area A2, an arc extinguishing system 4 which is arranged in a third area A3, an overload tripping mechanism which is arranged in a fourth area A4 and comprises a bimetallic strip 13, and a zero sequence current transformer 27 and a magnetic flux tripping device 24 which are arranged in a fifth area A5; the L-pole contact system and the N-pole contact system are arranged side by side along the width direction of the breaker shell 1; the zero sequence current transformer 27 and the magnetic flux release 24 are arranged side by side along the length direction of the breaker housing 1. Further, the first area A1, the second area A2 and the third area A3 are sequentially arranged along the length direction of the breaker housing 1 and are positioned at one end of the breaker housing 1 in the height direction, and the fourth area A4 and the fifth area A5 are positioned at the other end of the breaker housing 1 in the height direction; the second area A2 and the third area A3 are arranged side by side with the fifth area A5 along the height direction of the breaker housing 1; the first area A1, the second area A2 and the fourth area A4 are arranged side by side along the height direction of the breaker housing 1; a part of the fourth area A4 is located between the second area A2 and the fifth area A5; the zero sequence current transformer 27 and the magnetic flux release 24 are respectively arranged opposite to the second area A2 and the third area A3. Further, the fourth area A4 has an L-shaped structure, one end of which is located between the second area A2 and the fifth area A5, and the other end of which is arranged side by side with the fifth area A5 along the length direction of the circuit breaker housing 1.

The residual current operated circuit breaker optimizes the space distribution of each component part, ensures reasonable and compact internal layout, is beneficial to miniaturization of products, and realizes the residual current circuit breaker function with the action function irrelevant to the power supply voltage in a limited space (for example, a space after 18 mm).

The left-right direction of fig. 1 is the height direction of the breaker case 1, the inside-outside direction of the paper of fig. 1 is the width direction of the breaker case 1, and the up-down direction of fig. 1 is the length direction of the breaker case 1. It should be noted that the "height direction", "length direction" and "width direction" are used to designate the three-dimensional space arrangement of the circuit breaker housing 1, so as to facilitate better understanding of the internal structural layout of the residual current operated circuit breaker, and do not limit the actual use direction or orientation of the residual current operated circuit breaker of the present invention.

Specifically, in the residual current operated circuit breaker according to the present invention, as shown in fig. 1, a first area A1, a second area A2 and a third area A3 are sequentially disposed from top to bottom and are located at the left end of the circuit breaker housing 1, and a fourth area A4 and a fifth area A5 are disposed vertically and are located at the right end of the circuit breaker housing 1; the first area A1 and the second area A2 are arranged opposite to the fourth area A4; the second area A2 and the third area A3 are arranged opposite to the fifth area A5; a part of the fourth area A4 is located between the second area A2 and the fifth area A5; the zero sequence current transformer 27 and the magnetic flux release 24 are arranged in the fifth area A5 side by side up and down; the operating mechanism 5 and the leakage test mechanism are arranged in a first area A1, the overload tripping mechanism is arranged in a fourth area A4, the short-circuit instantaneous tripping mechanism 3 is arranged in a second area A2, the arc extinguishing system 4 is arranged in a third area A3, the short-circuit instantaneous tripping mechanism 3 is an electromagnetic tripping mechanism and is arranged side by side with the arc extinguishing system 4 up and down (namely, the short-circuit instantaneous tripping mechanism 3 and the arc extinguishing system 4 are arranged side by side along the length direction of the circuit breaker); the operating mechanism 5 extends to the second area A2, and extends between the short circuit instantaneous trip mechanism 3 and the overload trip mechanism, the L-pole contact system is located between the short circuit instantaneous trip mechanism 3 and the zero sequence current transformer 27, and of course, the portions of the L-pole contact system and the N-pole contact system provided with contacts extend to the third area A3 to be matched with the arc extinguishing system 4.

The breaker housing 1 is in an approximately convex structure and comprises a main body part and a convex part which is convex on the upper side of the main body part, most of the first area A1 and the fourth area A4 are positioned on the convex part, and one end of the bimetallic strip 13 of the overload trip mechanism of the fourth area A4 extends between the second area A2 and the fifth area A5. The second area A2, the third area A3 and the fifth area A5 are positioned in a main body part, two sides of the main body part are respectively provided with a group of connecting terminals, a short-circuit instantaneous tripping mechanism 3, an arc extinguishing system 4, a zero sequence current transformer 27 and a magnetic flux tripping device 24 are arranged between the two groups of connecting terminals, the short-circuit instantaneous tripping mechanism 3 and the zero sequence current transformer 27 are oppositely arranged along the height direction of the circuit breaker shell 1 at intervals, an L-pole contact system and an N-pole contact system are positioned between the short-circuit instantaneous tripping mechanism 3 and the zero sequence current transformer 27, part of operating mechanisms extend to the position between the short-circuit instantaneous tripping mechanism 3 and the zero sequence current transformer 27, the arc extinguishing system 4 and the magnetic flux tripping device 24 are oppositely arranged along the height direction of the circuit breaker shell 1 at intervals, and at least part of L-pole contact systems extend to the position between the arc extinguishing system 4 and the magnetic flux tripping device 24.

As shown in fig. 1 and 2, the operating mechanism 5 includes a handle 5-0, a trip member 5-3, a catch member 5-4, and a lever 5-5 rotatably provided to the circuit breaker housing 1, and a first link 5-1 and a second link 5-2, respectively; one end of the first connecting rod 5-1 is hinged with the handle 5-0, the other end of the first connecting rod is hinged with one end of the second connecting rod 5-2 and is inserted into a waist-shaped hole of the trip piece 5-3 in a sliding way, the other end of the second connecting rod 5-2 is hinged with the lever 5-5, the lever 5-5 is respectively connected with an N pole moving contact 38 of an N pole contact system and an L pole moving contact 19 of an L pole contact system in a driving way so as to synchronously drive the N pole contact system and the L pole contact system to be closed or opened, the trip piece 5-3 is in snap fit with the trip piece 5-4, and the trip piece 5-4 is driven by a short circuit instantaneous trip mechanism 3, an overload protection mechanism or a magnetic flux trip 24 to rotate so as to release the snap fit with the trip piece 5-3, and the operating mechanism is tripped. Further, the locking piece 5-4 and the lever 5-6 are coaxially arranged. The operating mechanism is a cam-five-bar mechanism, the whole structure is compact, and the occupied space for the movement of the whole parts in different states is small, so that the internal space of the circuit breaker shell is further saved; and the tripping mechanism and the operating mechanism which are formed by the tripping element and the locking element are separate and independent mechanisms, and when the operating mechanism executes normal closing or opening operation, the tripping mechanism is in a static state, so that the integral reliability of the operating mechanism is ensured. Further, one end of the jump fastener 5-3 is rotatably arranged on the breaker shell 1, the other end of the jump fastener is in snap fit with the lock fastener 5-4, and the waist-shaped hole of the jump fastener is positioned in the middle of the jump fastener 5-3; when the operating mechanism 5 is in a closing state, the moment applied to the jump buckle 5-3 by the end of the first connecting rod 5-1 inserted in the jump buckle waist-shaped hole is equal to the moment applied to the jump buckle 5-3 by the locking piece 5-4 in opposite directions, and the moment applied to the jump buckle 5-3 by the locking piece 5-4 is larger than the moment applied to the jump buckle 5-3 by the end of the first connecting rod 5-1 inserted in the jump buckle waist-shaped hole, so that the tripping force of the operating mechanism is reduced, and the magnetic flux tripper 24 can reliably push the tripping mechanism to trip.

As shown in fig. 1-2, 4a and 5a-5b, the residual current operated circuit breaker of the invention further comprises a first partition board 2, a short-circuit instantaneous trip mechanism 3, an L-pole contact system and an arc extinguishing system 4, and the L-pole contact system and the N-pole contact system are respectively positioned at two sides of the first partition board 2.

1-2, 4a and 5a-5b, the lever 5-5 comprises a lever partition 5-50, the L-pole moving contact 19 and the N-pole moving contact 38 are respectively positioned at two sides of the lever partition 5-50, the lever partition 5-50 is overlapped with the first partition 2 in a staggered way, and the first partition 2 at least partially stretches into the space between the L-pole moving contact 19 and the N-pole moving contact 38; when the L-pole moving contact 19 and the N-pole moving contact 38 move along with the lever 5-5, the lever partition 5-50 and the insulating partition 1 are always at least partially overlapped, and the lever partition 5-50 is matched with the first partition 2, so that the insulating gap and the creepage distance between the L-pole circuit and the N-pole circuit of the residual current operated circuit breaker are improved. Further, the lever partition 5-50 is a thin plate feature. The handle 5-0, the trip element 5-3, the catch element 5-4 and the lever 5-5, and the first connecting rod 5-1 and the second connecting rod 5-2 are integrally located in the first area A1, the catch element 5-4 extends partially into the second area A2, cooperates with the short circuit instantaneous trip mechanism 3, the overload trip mechanism and the magnetic flux trip 24, and the lever 5-5 extends partially into the second area A2 to assemble the N-pole moving contact 38 of the N-pole contact system and the L-pole moving contact 19 of the L-pole contact system.

As shown in fig. 2, the first partition board 2 includes a partition board main body and a partition board expansion part, wherein a side edge of the partition board main body and a side edge of the lever partition 5-50, which are staggered and overlapped, is a main body side edge, the partition board expansion part is convexly arranged on the main body side edge and extends towards the lever 5-5, and the partition board expansion part is overlapped with the lever partition 5-50 and extends between two moving contacts; the lever 5-5 comprises two lever shafts 5-51 which are respectively arranged at two sides of the lever and are used for being connected with the moving contact, and the two lever shafts 5-51 are positioned in a right-angle notch formed by the expansion part of the partition plate and the side edge of the main body.

As shown in fig. 8, one end of the locking piece 5-4 is rotatably arranged on the breaker casing 1, the other end is provided with a driven surface 61 and a knocking part 62, the driven surface 61 is in driving fit with the short circuit instantaneous trip mechanism 3, and the knocking part 62 is in driving fit with the L-pole moving contact 19; when the driven surface 61 is struck by the short-circuit instantaneous tripping mechanism 3 to rotate the locking piece 5-4, the striking part 62 strikes the L-pole moving contact 19 to break the L-pole moving contact 19 from the L-pole fixed contact 3-2 of the L-pole contact system, so that the L-pole moving contact 19, the L-pole fixed contact 3-2 and the L-pole moving contact are opened for a certain distance before the tripping and resetting of the operating mechanism, and the arc movement is accelerated, so that the current limiting capacity of short-circuit current is improved. Further, the knocking portions 62 behind the receiving surface 61 are located on both sides of the locking piece 5-4 in the width direction.

As shown in fig. 1-2, the short circuit instantaneous trip mechanism 3 is directly in driving fit with the locking piece 5-4; the operating mechanism further comprises a transmission rod 5-7, one end of the transmission rod 5-7 is hinged with the locking piece 5-4, and the other end of the transmission rod is in driving fit with the bimetallic strip 13 and the magnetic flux release 24 respectively. Further, the transmission rod 5-7 is disposed in the second area A2 and extends in the height direction of the breaker housing 1.

As shown in fig. 1 and 3a-3b, the leakage test mechanism comprises a test button 32, and a switch torsion spring 34 and a matched conductive structure which are sequentially connected in series between an L pole circuit and an N pole circuit of the residual current operated circuit breaker, wherein the test button 32, the switch torsion spring 34 and the matched conductive structure are all positioned on one side of a handle 5-0 of the operating mechanism 5, and the test button 32 and the handle 5-0 are arranged at one end of the circuit breaker housing 1 side by side along the height direction of the circuit breaker housing 1. Further, the switch torsion spring 34 comprises a switch arm and a connecting arm, the switch arm is in driving fit with the test button 32, the connecting part is fixedly arranged, the matched conductive structure comprises a matched torsion spring 31, two ends of the matched torsion spring 31 are respectively provided with a matched arm and a fixed arm, the matched arm is in driving fit with the operating mechanism, and the fixed part is fixedly arranged; the short circuit instantaneous tripping mechanism 3 is an electromagnetic tripping device and comprises a magnetic yoke 3-0 and a coil assembly 3-1, wherein the magnetic yoke 3-0 is electrically connected with an L pole contact system; the circuit breaker is in a brake-separating state, and the matching arm is disconnected with the magnetic yoke 3-0; when the breaker is switched from a switching-off state to a switching-on state, the operating mechanism drives the matching arm to be conducted with the magnetic yoke 3-0; the switch arm and the matching conductive structure are kept in a normally open state, and the test button 32 is pressed to drive the switch arm to be in contact conduction with the matching conductive structure.

As shown in fig. 2 and 6, the yoke 3-0 is electrically connected with the L-pole fixed contact 3-2 of the L-pole contact system, and the yoke 3-0 and the L-pole fixed contact 3-2 are preferably in an integral structure. Further, the yoke 3-0 includes a yoke base plate, a first yoke arm and a second yoke arm, where the first yoke arm and the second yoke arm are disposed opposite to each other and are respectively bent and connected to two ends of the yoke base plate, the first yoke arm is matched with the matching arm of the matching torsion spring 31, and the L-pole static contact 3-2 and the first yoke arm are connected to the same end of the yoke base plate 70 and are respectively bent towards two ends of the yoke base plate 70.

As shown in fig. 1 and 3a, the axes of the switch torsion spring 34 and the matching torsion spring 31 are arranged at intervals in parallel, the test button 32 and the handle 5-0 are arranged at intervals side by side, and the moving direction of the test button 32 is perpendicular to the axes of the switch torsion spring 34 and the matching torsion spring 31.

As shown in fig. 1, the matching conductive structure comprises a matching torsion spring shaft, and a matching torsion spring 31 is sleeved on the matching torsion spring shaft; the test button 32 is pressed to cause the switch arm of the drive switch torsion spring 34 to be in contact with the mating torsion spring shaft.

As shown in fig. 3a, one end of the first connecting rod 5-1 connected with the second connecting rod 5-2 of the operating mechanism 5 is in driving fit with a fit arm of the fit torsion spring 31, and when the residual current operated circuit breaker is switched from the opening state to the closing state, the fit arm is driven to be in contact electrical connection with the magnetic yoke 3-0.

As shown in fig. 1-3a, the residual current operated circuit breaker according to the present invention further comprises a current limiting resistor 36, wherein the current limiting resistor 36 is connected in series between the connecting arm of the switching torsion spring 34 and the N-pole terminal of the residual current operated circuit breaker, and the zero sequence current transformer 24 is connected in series between the yoke 3-0 and the L-pole terminal of the residual current operated circuit breaker. Further, the current limiting resistor 36 is electrically connected to the N-pole terminal of the residual current operated circuit breaker through a second wire 37.

As shown in fig. 1 and 3a-3b, the residual current operated circuit breaker according to the present invention further comprises an anti-misoperation device arranged in the first area A1, wherein the anti-misoperation device comprises a limit structure 33 capable of being switched between a first position and a second position; when the handle 5-0 of the residual current operated circuit breaker is positioned at the opening position, the handle 5-0 is in limit fit with the limit structure 33 to limit the handle to the first position, and the limit structure 33 blocks the test button 32 from being pressed to the test position; the residual current operated circuit breaker is in a closing state, the handle 5-0 is positioned at a closing position, when an external force presses the test button 32 to the test position, the residual current operated circuit breaker is tripped, the test button 32 drives the limiting structure 33 to move from the first position to the second position, then the handle 5-0 is limited by the limiting structure 33 in the process of rotating from the closing position to the opening position, the handle 5-0 is prevented from rotating to the opening position, and the handle 5-0 is kept at an intermediate temporary stop position between the closing position and the opening position. Further, after the test button 32 is released and reset from the test position, the limit structure 33 is reset from the second position to the first position, and the handle 5-0 is rotated to the opening position. Further, after the test button 32 is released and reset from the test position, the limit structure 33 is driven by the handle 5-0 to reset from the second position to the first position.

The misoperation preventing device can avoid the situation that a user is injured by the handle impact of the operating mechanism when the user presses the test button in the electric leakage test, and prevent the situation that the operator is afraid of operating the test button due to fear psychology generated by the impact of the handle.

As shown in fig. 1, 3a-3b, the limit structure 33 is rotatably arranged, and the limit structure 33 is rotated to switch between the first position and the second position.

As shown in fig. 1 and 3a-3b, when the test button 32 is released and reset from the test position, the handle 5-0 is rotated toward the release position and drives the limit mechanism 33 to reset from the second position to the first position.

As shown in fig. 1, 3a-3b, the limit structure 33 is located between the test button 32 and the handle 5-0.

As shown in fig. 3b, the limiting structure 33 is rotatably disposed and includes a first boss 33-0 and a second boss 33-1. Referring to fig. 1 and 3a-3b, when the handle 5-0 is located at the opening position, the handle 5-0 is in limit fit with the second boss 33-1 to limit the limit structure 33 at the first position, and the first boss 33-0 is matched with the test button 32 to block the test button 32 from moving to the test position; when the test button 32 is located at the test position, the second boss 33-1 is in limit fit with the handle 5-0 to prevent the handle 5-0 from rotating to the brake-off position when the limit structure 33 is limited at the second position by limit fit of the test button 32 and the first boss 33-0.

As shown in fig. 3b, the handle 5-0 includes a handle operation portion and a handle installation portion, wherein one end of the handle operation portion protrudes outside the circuit breaker housing 1 for operation, and the other end is connected to the handle installation portion, and the handle installation portion is rotatably disposed on the circuit breaker housing 1, and the handle installation portion is engaged with the second boss 33-1. Further, the handle mounting part comprises a circumferential side wall 5-01 and a limiting table 5-02; when the handle 5-0 is positioned at the opening position, the circumferential side wall 5-01 is in limit fit with the second boss 33-1; when the test button 32 is located at the test position and the limit structure 33 is located at the second position, the second boss 33-1 is in limit fit with the limit table 33.

As shown in fig. 1, the two ends of the bimetal 13 are respectively a double-gold mounting end and a double-gold matching end, the double-gold mounting end is opposite to the first area A1, and the double-gold matching end is located between the second area A2 and the fifth area A5 and is in driving fit with the operating mechanism 5. Further, the double-metal matching end is in driving fit with the locking piece 5-4 of the operating mechanism 5 through a transmission rod 5-7.

As shown in fig. 1-2, the residual current operated circuit breaker according to the present invention further includes a second partition 15 and a double-gold support 14 provided in the fourth area A4, the double-gold mounting end of the bimetal 13 is provided on the double-gold support 14, the double-gold support 14 is fixed between the second partition 15 and the circuit breaker housing 1 and is in limit fit with the second partition 15 and the circuit breaker housing 1, respectively, the adjusting nut 16-1 is fixed on the second partition 15, and the insulating adjusting knob 17 is rotatably provided on the second partition 15 about its own axis. Further, as shown in connection with fig. 1 and 3a, the current limiting resistor 36 is disposed on one side of the second separator 15, and the bimetal 13, the bimetal support 14 and the adjustment structure are disposed on the other side of the second separator 15.

As shown in fig. 1, the overload protection mechanism further comprises an adjusting structure, the adjusting structure comprises an adjusting screw 16-0, an adjusting nut 16-1 and an insulating adjusting button 17, the adjusting nut 16-1 is fixedly arranged, the adjusting screw 16-0 is in threaded fit with the adjusting nut 16-1, one end of the adjusting screw is matched with the bimetallic strip 13, the other end of the adjusting screw is matched with the insulating adjusting button 17, the adjusting screw 16-0 and the insulating adjusting button 17 synchronously rotate, and the insulating adjusting button 17 improves the insulating gap and the creepage distance between the adjusting screw 16-0 and the exterior of the residual current operated circuit breaker, so that safety is improved. Further, as shown in fig. 2, the insulating adjusting knob 17 includes an adjusting knob boss, an adjusting knob mounting portion and an adjusting knob operating portion which are sequentially connected, the adjusting screw 16-0 is provided with a screw insertion hole which is in insertion fit with the adjusting Niu Tutai, the outer diameter of the adjusting knob mounting portion is larger than the outer diameters of the adjusting knob boss and the adjusting knob operating portion, and the adjusting knob mounting portion is rotatably disposed on the second partition 15. Further, the adjusting button boss is a polygonal boss, and the screw insertion hole is a polygonal hole.

As shown in fig. 5b, the first partition board 2 further includes an air channel 22 disposed at one side of the first partition board, the air channel 22 is a labyrinth type air channel, and includes at least two reverse bending channels, one end of the air channel 22 is in opposite fit with the N-pole contact system, and the other end is provided with at least one air outlet; the air passage 22 prevents the spray arc distance from being excessively large. Further, the air passage 22 is provided with two air outlets, namely a first air outlet 2-10 and a second air outlet 2-13. Further, the first exhaust holes 2-10 and the second exhaust holes 2-13 are respectively oriented in two directions perpendicular to each other.

As shown in fig. 5b, the residual current operated circuit breaker according to the present invention further includes an N-pole arc striking plate 39, the N-pole arc striking plate 39 is disposed opposite to the N-pole fixed contact 20 of the N-pole contact system, the N-pole moving contact 38 is disposed between the N-pole arc striking plate 39 and the N-pole fixed contact 20, and a space between the N-pole arc striking plate 39 and the N-pole fixed contact 20 is disposed opposite to an inlet end of the air passage 22.

As shown in fig. 1 and 7, the residual current operated circuit breaker according to the present invention further includes a circuit board 30 disposed in the fifth area A5, and the circuit board 30, the magnetic flux release 24 and the zero sequence current transformer 27 are disposed side by side in sequence along the length direction of the circuit breaker housing 1.

As shown in connection with fig. 1 and 7, the residual current operated circuit breaker of the present invention further includes a shield 26 and an L-pole incoming electrical connection board 29 disposed in the fifth area A5, and an L-pole striking board 25 disposed in the third area A3; the L-pole arc striking plate 25 and the L-pole power feeding wiring plate 29 are respectively positioned at two sides of the magnetic flux release 24, and the L-pole arc striking plate 25 is electrically connected with the L-pole power feeding wiring plate 29 through a first lead 28; the shielding case 26 comprises a shielding case top plate and a shielding case back plate, the shielding case top plate is positioned between the zero sequence current transformer 27 and the magnetic flux release 24, and the shielding case back plate is positioned between the first conducting wire 28 and the magnetic flux release 24; the shielding cover 26 can effectively shield the influence of a strong magnetic field generated by short-circuit current, and prevents the magnetic steel of the magnetic flux release 24 from demagnetizing. Further, as shown in fig. 7, the L-pole electrical connection board 29 is provided with a groove feature, and one end of the coil of the zero-sequence current transformer 27 is matched with the groove of the L-pole electrical connection board 29, so that the soldering reliability of the L-pole electrical connection board and the L-pole electrical connection board is ensured.

As shown in fig. 1-2 and 4a-4b, the residual current operated circuit breaker of the invention further comprises a magnetic flux trip reset structure, wherein the magnetic flux trip reset structure comprises a deflector 21 and a push rod 22 which are respectively rotatably arranged on the circuit breaker shell 1, and a reset spring 23; when the magnetic flux release 24 acts, the ejector rod of the magnetic flux release 24 ejects to drive the push rod 22 to rotate, and the push rod 22 drives the operating mechanism 5 to release; after the residual current operated circuit breaker is tripped and opened due to the action of the magnetic flux tripper 24, the reset spring 23 drives the deflector 21 to rotate, and meanwhile, the deflector 21 drives the push rod 22 to rotate in the direction of resetting the push rod; when the residual current operated circuit breaker is switched on, the operating mechanism 5 drives the deflector rod 21 to rotate so as to be separated from the push rod 22. Further, when the magnetic flux release 4 operates, the push rod 22 drives the latch 5-4 of the operating mechanism 5 to rotate to release the snap fit with the latch 5-3, so as to release the operating mechanism 5. Further, when the magnetic flux release 4 acts, the push rod 22 drives the locking piece 5-4 to rotate through the transmission rod 5-7. Further, as shown in fig. 1, the magnetic flux release reset structure is disposed between the arc extinguishing system 4 and the magnetic flux release 24.

As shown in fig. 1-2 and 4a-4b, the middle part of the push rod 22 is rotatably arranged on the breaker housing 1, one end of the push rod is matched with the transmission rod 8a, and the other end of the push rod is respectively matched with the deflector rod 21 and the magnetic flux release 24.

As shown in fig. 1-2 and 4a-4b, the magnetic flux release resetting structure further comprises a pull rod 18, the pull rod 1 is slidably arranged on the circuit breaker housing 1, and the lever 5-6 of the operating mechanism 5 is in driving fit with the deflector rod 2 through the pull rod 18. Further, the lever shaft 5-51 of the lever 5-6 is in driving engagement with the shift lever 21 via the pull rod 18. Further, one end of the deflector rod 21 is rotatably arranged on the breaker housing 1, the middle part of the deflector rod is matched with the pull rod 1, and the other end of the deflector rod is in driving fit with the push rod 3.

The foregoing is a further detailed description of the invention in connection with the preferred embodiments, and it is not intended that the invention be limited to the specific embodiments described. It will be apparent to those skilled in the art that several simple deductions or substitutions may be made without departing from the spirit of the invention, and these should be considered to be within the scope of the invention.

Claims

1. A residual current operated circuit breaker, characterized by: the circuit breaker comprises a circuit breaker housing (1), wherein the circuit breaker housing (1) comprises a first area (A1), a second area (A2), a third area (A3), a fourth area (A4) and a fifth area (A5) which are arranged in the circuit breaker housing (1) on the projection perpendicular to the width direction of the circuit breaker housing (1); the residual current operated circuit breaker further comprises an operating mechanism (5) and a leakage test mechanism which are arranged in the first area (A1), a short-circuit instantaneous tripping mechanism (3), an L-pole contact system and an N-pole contact system which are arranged in the second area (A2), an arc extinguishing system (4) which is arranged in the third area (A3), an overload tripping mechanism which is arranged in the fourth area (A4) and comprises a bimetallic strip (13), and a zero sequence current transformer (27) and a magnetic flux tripping device (24) which are arranged in the fifth area (A5); the L-pole contact system and the N-pole contact system are arranged side by side along the width direction of the breaker shell (1); the zero sequence current transformer (27) and the magnetic flux release (24) are arranged side by side along the length direction of the breaker shell (1) and are respectively opposite to the second area (A2) and the third area (A3).

2. The residual current operated circuit breaker according to claim 1, characterized in that: the first area (A1), the second area (A2) and the third area (A3) are sequentially arranged along the length direction of the circuit breaker shell (1) and are positioned at one end of the circuit breaker shell (1) in the height direction, and the fourth area (A4) and the fifth area (A5) are positioned at the other end of the circuit breaker shell (1) in the height direction; the second area (A2) and the third area (A3) are arranged side by side with the fifth area (A5) along the height direction of the breaker housing (1); the first area (A1) and the second area (A2) are arranged side by side with the fourth area (A4) along the height direction of the breaker shell (1); a portion of the fourth region (A4) is located between the second region (A2) and the fifth region (A5); the zero sequence current transformer (27) and the magnetic flux release (24) are respectively arranged opposite to the second area (A2) and the third area (A3).

3. The residual current operated circuit breaker according to claim 2, characterized in that: the fourth area (A4) is of an L-shaped structure, one end of the fourth area is located between the second area (A2) and the fifth area (A5), and the other end of the fourth area and the fifth area (A5) are arranged side by side along the length direction of the breaker shell (1).

4. A residual current operated circuit breaker according to any one of claims 1-3, characterized in that: the operating mechanism (5) comprises a handle (5-0), a jump fastener (5-3), a lock catch piece (5-4) and a lever (5-5) which are respectively arranged on the breaker shell (1) in a rotating way, and a first connecting rod (5-1) and a second connecting rod (5-2); one end of the first connecting rod (5-1) is hinged with the handle (5-0), the other end of the first connecting rod is hinged with one end of the second connecting rod (5-2) and is inserted into a jump fastener waist-shaped hole of the jump fastener (5-3) in a sliding mode, the other end of the second connecting rod (5-2) is hinged with the lever (5-5), the lever (5-5) is respectively connected with an N pole moving contact (38) of an N pole contact system and an L pole moving contact (19) of an L pole contact system in a driving mode, the jump fastener (5-3) is in snap fit with the lock fastener (5-4), and the lock fastener (5-4) is driven by a short circuit instantaneous tripping mechanism (3), an overload protection mechanism or a magnetic flux tripping device (24) to rotate so as to release the snap fit with the jump fastener (5-3), and the operating mechanism is tripped.

5. The residual current operated circuit breaker according to claim 4, characterized in that: the residual current operated circuit breaker further comprises a first partition board (2), a short-circuit instantaneous tripping mechanism (3), an L-pole contact system and an arc extinguishing system (4), and the short-circuit instantaneous tripping mechanism and the L-pole contact system are respectively positioned at two sides of the first partition board (2);

the lever (5-5) comprises a lever partition (5-50), the L-pole movable contact (19) and the N-pole movable contact (38) are respectively positioned at two sides of the lever partition (5-50), the lever partition (5-50) is overlapped with the first partition (2) in a staggered manner, and the first partition (2) at least partially stretches into the space between the L-pole movable contact (19) and the N-pole movable contact (38); the L-pole moving contact (19) and the N-pole moving contact (38) always keep at least partially overlapped with the insulating partition board (1) when the L-pole moving contact and the N-pole moving contact move together with the lever (5-5).

6. The residual current operated circuit breaker according to claim 4, characterized in that: the short circuit instantaneous tripping mechanism (3) is directly in driving fit with the locking piece (5-4); the operating mechanism further comprises a transmission rod (5-7), one end of the transmission rod (5-7) is hinged with the locking piece (5-4), and the other end of the transmission rod is respectively in driving fit with the bimetallic strip (13) and the magnetic flux release (24).

7. The residual current operated circuit breaker according to claim 4, characterized in that: one end of the locking piece (5-4) is rotatably arranged on the circuit breaker shell (1), the other end of the locking piece is provided with a driven surface (61) and a knocking part (62), the driven surface (61) is in driving fit with the short circuit instantaneous tripping mechanism (3), and the knocking part (62) is in driving fit with an L pole moving contact (19) of the L pole contact system; when the driven surface (61) is struck by the short-circuit instantaneous tripping mechanism (3) to enable the locking piece (5-4) to rotate, the striking part (62) strikes the L-pole moving contact (19) to be disconnected with the L-pole fixed contact (3-2) of the L-pole contact system.

8. A residual current operated circuit breaker according to any one of claims 1-3, characterized in that: the leakage test mechanism comprises a test button (32), and a switch torsion spring (34) and a matched conductive structure which are sequentially connected in series between an L pole circuit and an N pole circuit of the residual current operated circuit breaker, wherein the test button (32), the switch torsion spring (34) and the matched conductive structure are all positioned on one side of a handle (5-0) of the operating mechanism (5), and the test button (32) and the handle (5-0) are arranged side by side along the height direction of the circuit breaker shell (1).

9. The residual current operated circuit breaker according to claim 8, characterized in that: the two ends of the switch torsion spring (34) are respectively provided with a switch arm and a connecting arm, the switch arm is in driving fit with the test button (32), the connecting arm is fixedly arranged, the matched conductive structure comprises a matched torsion spring (31), the two ends of the matched torsion spring (31) are respectively provided with a matched arm and a fixed arm, the matched arm is in driving fit with the operating mechanism, and the fixed arm is fixedly arranged; the short-circuit instantaneous tripping mechanism (3) is an electromagnetic tripping device and comprises a magnetic yoke (3-0) and a coil assembly (3-1), wherein the magnetic yoke (3-0) is electrically connected with the L pole contact system; the circuit breaker is in a brake-separating state, and the matching arm is disconnected with the magnetic yoke (3-0); when the breaker is switched from a switching-off state to a switching-on state, the operating mechanism drives the matching arm to be conducted with the magnetic yoke (3-0); the switch arm and the matched conductive structure are kept in a normally open state, and the test button (32) is pressed to drive the switch arm to be in contact conduction with the matched conductive structure.

10. A residual current operated circuit breaker according to any one of claims 1-3, characterized in that: the residual current operated circuit breaker further comprises an anti-misoperation device arranged in the first area (A1), wherein the anti-misoperation device comprises a limiting structure (33) capable of being switched between a first position and a second position; when the handle (5-0) of the residual current operated circuit breaker is positioned at the opening position, the handle (5-0) is in limit fit with the limit structure (33) to limit the limit structure (33) at a first position, and the limit structure (33) blocks a test button (32) of the leakage test mechanism from being pressed to a test position; when the circuit breaker is in a closing state, an external force presses the test button (32) to a test position, the limiting structure (33) acts to a second position, and the handle (5-0) is prevented from rotating to a breaking position;

after the test button (32) is released and reset, the limit structure (33) is driven by the handle (5-0) to reset from the second position to the first position, and the handle (5-0) rotates to the opening position;

the two ends of the bimetallic strip (13) are respectively a double-gold mounting end and a double-gold matching end, the double-gold mounting end is opposite to the first area (A1), and the double-gold matching end is positioned between the second area (A2) and the fifth area (A5) and is in driving fit with the operating mechanism (5);

the overload protection mechanism further comprises an adjusting structure, the adjusting structure comprises an adjusting screw (16-0), an adjusting nut (16-1) and an insulating adjusting button (17), the adjusting nut (16-1) is fixedly arranged, the adjusting screw (16-0) is in threaded fit with the adjusting nut (16-1), one end of the adjusting screw is matched with the bimetallic strip (13), the other end of the adjusting screw is matched with the insulating adjusting button (17), and the adjusting screw (16-0) and the insulating adjusting button (17) synchronously rotate;

the residual current operated circuit breaker further comprises a second partition plate (15) and a double-gold support piece (14) which are arranged in the fourth area (A4), wherein the double-gold mounting end is arranged on the double-gold support piece (14), the double-gold support piece (14) is fixed between the second partition plate (15) and the circuit breaker shell (1), the adjusting nut (16-1) is fixed on the second partition plate (15), and the insulating adjusting button (17) is rotatably arranged on the second partition plate (15) around the axis of the insulating adjusting button;

the first partition board (2) comprises an air passage (22) arranged at one side of the first partition board, the air passage (22) is a labyrinth type air passage and comprises at least two reverse bending passages, one end of the air passage (22) is matched with the N-pole contact system relatively, and the other end of the air passage is provided with at least one air outlet;

the residual current operated circuit breaker further comprises a circuit board (30) arranged in the fifth area (A5), and the circuit board (30), the magnetic flux release (24) and the zero sequence current transformer (27) are sequentially arranged side by side along the length direction of the circuit breaker shell (1);

the residual current operated circuit breaker further comprises a shielding case (26) and an L-pole electricity-feeding wiring board (29) arranged in a fifth area (A5), and an L-pole arc striking board (25) arranged in a third area (A3);

the L-pole arc striking plate (25) and the L-pole electric outlet wiring plate (29) are respectively positioned at two sides of the magnetic flux release (24), and the L-pole arc striking plate (25) is electrically connected with the L-pole electric inlet wiring plate (29) through a first lead (28); the shielding case (26) comprises a shielding case top plate and a shielding case back plate, the shielding case top plate is positioned between the zero sequence current transformer (27) and the magnetic flux release (24), and the shielding case back plate is positioned between the first lead (28) and the magnetic flux release (24);

the residual current operated circuit breaker further comprises a magnetic flux release reset structure, wherein the magnetic flux release reset structure comprises a deflector rod (21) and a push rod (22) which are respectively rotatably arranged on the circuit breaker shell (1), and a reset spring (23);

when the magnetic flux release (24) acts, the ejector rod of the magnetic flux release (24) is ejected to drive the push rod (22) to rotate, and the push rod (22) drives the operating mechanism (5) to release; after the residual current operated circuit breaker is tripped and disconnected due to the action of the magnetic flux tripper (24), the reset spring (23) drives the deflector rod (21) to rotate, and meanwhile, the deflector rod (21) drives the push rod (22) to rotate in the direction of resetting the ejector rod; when the residual current operated circuit breaker is switched on, the operating mechanism (5) drives the deflector rod (21) to rotate so as to separate the deflector rod from the push rod (22).