KR20070093498A - Compact leakage breaker having over current and short protection - Google Patents

Abstract

A compact leakage breaker for overload and short circuit protection is provided to prevent the damage of the breaker due to an arc and a fire by installing an arc extinguishing device and an insulating plate in the breaker. A compact leakage breaker for overload and short circuit protection includes a breaker body(10) and a case(40). The breaker body(10) fixes a connecting terminal(11) to be connected to a power line. The breaker body(10) is extended to be bent toward a top part in one direction and forms an extension unit(12) bent in the other direction. A fixing contacting point(13) is fixed on a first stage of the extension unit(12). The case(40) is a shape to wrap a top part of the breaker body(10) and has a penetrating hole and a discharging hole(42). The penetrating hole is formed to make a handle(20) protruded to the outside. The discharging hole(42) with predetermined size is formed to discharge an arc generated in a position of the input side connecting terminal(11).

Description

Compact Leakage Breaker Having Over current and Short Protection}

1 is a cross-sectional view showing a conventional current breaker.

Figure 2 is a cross-sectional view showing a state before the breaker of the present invention blocked.

Figure 3 is a cross-sectional view showing a state in which the breaker of the present invention is blocked.

Figure 4 is an exploded perspective view showing the main part of the present invention.

* Description of the symbols for the main parts of the drawings *

10: breaker main body 11: connector

12: Extension part 13: fixed contact

14: bimetal 15: lead

16: movable contact 17: trip bar

18: core 19: locking groove

20: handle 21: lever

22: crossbar 23: lead wire

24: PCB substrate 25: coil

26: guide 27: spring

29: jam piece 30: char

31: magnetic coil 32: guide

33: spring 34: core

35: engaging piece 36: connecting terminal

37: power line 40: case

41: through hole 42: discharge hole

43: extinguishing device 44: diaphragm

45: insulation plate

The present invention relates to an earth leakage circuit breaker combined with an overload and short circuit protection. The present invention relates to a circuit breaker in which a characteristic range of operation of a short circuit current is expanded in addition to the earth leakage circuit breaker function.

As is well known, the circuit breaker detects an overload current, a short circuit current, and a short circuit to detect a current and cuts off the current to prevent a safety accident.

The short-circuit blocking function of the circuit breaker generates heat to the holding resistor as the current flowing into the circuit breaker and the current output through the circuit breaker flow straight through the conductor without passing through the coil.

The bimetal is stretched and deformed according to the different thermal expansion coefficients of the bimetals installed in the circuit breaker by the heat generated as described above to cut off the current by switching the movable contact from the fixed contact to the off state.

In addition, the circuit breaker of the circuit breaker winding the magnetic coil on the outside of the core, and the coil connected to the conducting wire on the outside of the magnetic coil is formed in the magnetic coil as a magnetic field is formed in the magnetic coil due to the difference between the current drawn into the conductor and the output current. As the installed core is pulled, the trip bar is blocked to perform a short circuit blocking function.

A representative example of such a breaker is shown in FIG.

As shown therein, the coil 102 of the outer circumference is additionally wound when the short circuit current is energized, so that a magnetic field is formed by the coil 102 of the outer circumference of the magnet coil 101 when the short circuit current is energized. With the suction, the trip bar 104 is pulled so that the crossbar 105 is raised and the movable contact 106 is turned off.

Such a circuit breaker often generates a case in which the coil 102 wound around the magnet coil 101 generates heat and damages the magnet coil 101. The coil 102 wound around the magnet coil 101 may be a coil 102. Since the number of turns is limited and the magnetic force is not strong enough, the rapid operation is difficult.

In addition, since the core 103 having a smaller diameter is installed at the center of the magnet coil 101, the resistance of the core 103 is increased, and thus, the sliding operation of the core 103 due to the magnetic force is slow. . In addition, when a short circuit does not occur between two wires and only occurs in a single phase, a conventional small circuit breaker has an instantaneous portion only in a single phase, and thus, when a short circuit current flows in a phase without an instantaneous function, the breaker fails to function and may cause damage and fire. I have a problem.

Disclosure of the Invention An object of the present invention devised to solve the problems described above is to provide an overload and short circuit protection circuit leakage short circuit breaker for quickly blocking the contact of the breaker by overload and short circuit protection, short circuit, and the like.

In order to achieve the above object, the present invention is provided with a connection terminal and an output terminal on both sides of the circuit breaker main body, a bimetal is installed to block the fixed contact and the movable contact of the lead by the overload and short circuit protection, fixed by lifting the lead A lever and a crossbar are installed at the lower part of the handle so that the contact point and the movable contact point are blocked, and a trip bar is installed at the front of the handle to operate the core, and the locking piece of the core is fixed to the locking groove of the trip bar. In the known one having a case coupled to the outside, the PCB substrate is fixed to the front of the trip bar, and the guide tube corresponding to two power lines of positive (+) and negative (-) is fixed to the outside thereof. Overload and short-circuit leakage-leakage car with cores installed to allow coiling and winding of springs inside the guide tube Suggest a short term.

In this way, the present invention can provide a compact and large-capacity circuit breaker by quickly operating the trip bar by minimizing the magnetic resistance caused by the strong magnetic field in the core and the large diameter core installed inside the two coils, and overload and short circuit of the power line. The quick disconnection of the contact protects the device safely, as well as helping to prevent an electric shock caused by a short circuit.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

As shown, the present invention consists of a breaker body 10 and a case 40 surrounding the outside thereof.

In addition, the circuit breaker main body 10 fixes the connection terminal 11 so as to be connected to the power line, forms an extension part 12 which is extended to one side and bent upwards and then bent to another side, and a fixed contact point 13 at the tip thereof. Fix it.

In addition, a bimetal 14 is installed vertically in front of the fixed contact 13, and a lead 15 connecting the fixed contact 13 and the bimetal 14 is provided, and the fixed contact 13 and the front end thereof are provided. A movable contact 16 is formed to be in contact and interrupted. Such a bimetal 14 is made of a material having a high thermal expansion rate on one side and a material having a low thermal expansion rate on the other side, and has flexibility in generating overload and short circuit protection.

In addition, the trip bar 17 is installed to be rotated in front of the bimetal 14, and forms a locking groove 19 to be caught by the front end of the core 18 on both sides of the trip bar 17. In addition, the handle 20 for contacting and blocking the fixed contact 13 and the movable contact 16 according to the operation of the trip bar 17 or the user's operation is installed, and the lever 21 is installed at the lower part thereof. On the bottom thereof, two leads 15 are pressed to contact the stationary contact 13, and a crossbar 22 is installed to release the pressurized state of the leads 15 by raising the lever 21.

In addition, a PCB (Printed Curcuit Board) board 24 is installed in front of the trip bar 17, and two guide tubes 26 are formed in a hollow shape so as to wind the coil 25 on the board 24. The coil 25 connected to the conductive wire 23 is wound on the outside of the guide tube 26, and a spring 27 having elasticity is fixed to one side of the guide tube 26. In addition, the core 18 is installed in the guide tube 26 so as to be able to slide, and a locking piece 29 is formed at the tip of the core 18 so as to be caught by the locking groove 19 of the trip bar 17. Fix it.

Since the core 18 is inserted into the guide tube 26, the core 18 is formed to have a diameter larger than that of the core inserted into the magnetic coil of the conventional circuit breaker, and fixes the magnetic strip pieces 30 to the outside of the coil 25. . The magnetic strip piece 30 reduces the magnetic field resistance of the magnetic field generated in the coil 25 to generate a strong magnetic force.

In addition, between the two guide pipes 26, the magnetic coil 31 is wound around the hollow guide tube 32 is wound, the spring 33 is fixed to the inside thereof, the guide tube 32 can slide inside The core 34 is installed so that the locking piece 35 is formed at the tip of the core 34, and the locking piece 35 is fixed to the trip bar 17 to enable the trip bar 17 to be blocked. In addition, the coil 25 connected to the conductive wire 23 and wound around the guide tube 26 is connected to the output side connection terminal 36.

In addition, the case 40 is formed in a form surrounding the upper portion of the body 10, and forms a through-hole 41 so that the handle 20 protrudes to the outside, the arc generated at the position of the input side connection terminal 11 is emitted Excavation device 42 having an appropriately sized discharge hole 42, and having diaphragms 44 arranged at regular intervals to attenuate arcs generated when the fixed contact 13 and the movable contact 16 are blocked or contacted. 43 is provided, and an insulating plate 45 is provided on the rear surface thereof.

In the present invention having such a configuration, the power line is connected to the input side connection terminal 11, and current flows to the output side connection terminal 36 through the circuit breaker main body 10, which is installed at the lower side by operating the handle 20. The lever 21 pushes the crossbar 22 downward to lower the lid 15, whereby the fixed contact 13 of the connecting terminal 11 and the movable contact 16 of the lead 15 come into contact with each other. State, which is shown in FIG.

The energized current flows to the bimetal 14, the conductive wire 23, the coil 25, and the output side connecting terminal 36 connected to the lead 15, and flows to the load side of the motor, home appliance, etc. connected thereto. .

When overload and short-circuit protection occur on the load side in this energized state, overload and short-circuit protection flow through the power line 37 as shown in Figs. 3 and 4, and the overload and short-circuit protection of the guide tube 26 A strong magnetic field is generated in the coil 25 wound on the outside. As a result, the core 18 provided to slide inward of the guide tube 26 is sucked and retracted while compressing beyond the elastic force of the spring 27. The retraction of the core 18 causes the core 18 to be attracted to the substrate 24 side by Fleming's left-hand rule by winding the coil 25 in the direction of the trip bar 17 from the substrate 24 side.

As the core 18 is retracted as described above, the trip bar 17 is pulled by the catching piece 29 fixed to the catching groove 19 of the trip bar 17, and is coupled to the bottom of the trip bar 17. The lever 21 and the crossbar 22 are raised to release the pressurized state of the lid 15, and the lid 15 is raised to move the movable contact 16 away from the fixed contact 13.

Accordingly, the current drawn into the power line 37 is interrupted, and according to the present invention, the core 18 is attracted by the magnetic field generated by the two coils 25, so that the force pulling the trip bar 17, that is, the attraction force In addition, the core 18 is located inside the coil 25, so that the resistance of the core 18 is minimized, and as the diameter of the core 18 increases, the trip bar 17 can be operated more quickly.

In addition, the conventional circuit breaker was unreasonable in that the overload and short-circuit protection of the power line 37 to which the coil 25 was not wound cannot be interrupted. However, the present invention provides two coils 25 corresponding to each power line 37. By being installed, a positive (+) and a negative (-) power line (37) can be freely connected and used, and the power line (37) of any one of the two power lines (37) can be blocked even if overload and short circuit protection occurs. It will be possible.

In addition, when a short circuit occurs, the present invention is a magnetic field generated in the magnetic coil 31 wound inside the guide tube 32 to suck the core 34 installed in a sliding manner therein, the elastic force of the spring 33 Retreat while compressing over. This retraction of the core 34 causes the core 34 to be attracted to the substrate 24 side by Fleming's left hand law by winding the magnetic coil 31 in the direction of the trip bar 17 on the substrate 24 side.

Accordingly, the engaging piece 35 formed at the tip of the core 34 is retracted and the trip bar 17 is pulled out so that the lever 21 and the crossbar 22 coupled thereto are raised, and the lid 15 is raised. As a result, the current is cut off.

In addition, since the input side connecting terminal 11 having the fixed contact 13 is bent to the rear side, the direction of the current flowing through the fixed contact 13 side and the current flowing through the lead 15 are opposite to each other, so that the movable contact 16 When the c) is raised, a repulsive force to push each other is generated, so that the contacts 13 and 16 are blocked more quickly.

In addition, when the contact (13, 16) contacts or interrupts, an arc is generated as strong as the current flows. A fire extinguishing device (43) made of diaphragm (44) is installed in the direction in which the flame is splashed to absorb and attenuate the flame energy. By doing so, the circuit breaker can be safely protected, and the insulation plate 45 is provided on the back side of the extinguishing device 43, thereby obtaining a more reliable insulation state.

In addition, the arc generated at the contacts 13 and 16 is discharged to the discharge hole 42 formed in the case 40 to maintain the inside of the case 40 in a good state.

In this way, the present invention provides a circuit breaker capable of breaking a short-circuit current of a small size and a large capacity by quickly operating a trip bar by minimizing magnetic resistance due to the operation of a core installed inside two coils and a strong magnetic field on a large diameter core. It can protect the device safely by the quick disconnection of the power line by the overload and short circuit protection of the power line, and also prevent the electric shock caused by the short circuit.The core is operated by the magnetic field by two coils, so the power line can be connected freely. And it is a small circuit breaker that has a useful effect that can be prevented burnout and fire of the circuit breaker due to the arc generated by the extinguishing device and the insulating plate is installed inside the breaker.

Claims (5)

Bimetals are provided on both sides of the circuit breaker main body 10 to connect the connection terminal 11 and the output terminal 37 to block the movable contact 16 of the fixed contact 13 and the lead 15 by overload and short circuit protection ( 14 is installed, and the lever 21 and the crossbar 22 are installed at the lower part of the handle 20 so that the fixed contact 13 and the movable contact 16 are blocked by the lifting of the lid 15. 20) a trip bar 17 installed at the front and operated by the operation of the core 18 is installed, and the engaging piece 29 of the core 18 is fixed to the engaging groove 19 of the trip bar 17, In the known one having a case 40 coupled to the breaker body 10 outside, Fixing the PCB substrate 24 in front of the trip bar 17, fixing the guide tube 26 corresponding to the two power lines 37 of positive (+) minus, coil outside the (25) is a small circuit breaker for overload and short circuit protection, characterized in that the core (18) is installed so as to be able to slide while fixing the spring (27) inside the guide tube (26). The method of claim 1, Small circuit breaker for overload and short circuit protection, characterized in that the magnetic strip piece (30) is installed on the outside of the coil (25). The method of claim 1, An extension part 12 extending to one side of the connection terminal 11 is formed, bent upwards and then bent again to the other side, and a lead 15 is installed on the upper part thereof to generate a magnetic force when a current flows. Small earth leakage breaker with overload and short circuit protection, characterized in that the reverse action to the reverse. The method of claim 1, Small leakage circuit breaker for overload and short circuit protection, characterized in that the extinguishing device 43 is installed in front of the arc contact occurs when the fixed contact (13) and the movable contact (16) is blocked. The method of claim 1, The guide tube 32 is fixed to the earth leakage detecting circuit board at the side of the two guide tubes 26, the magnetic coil 31 is wound inside thereof, and a spring 33 having elasticity inside the guide tube 32. Small leakage circuit breaker with overload and short circuit protection, characterized in that it further comprises a core (34) capable of being over-slidable.

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