JP5070949B2 - Circuit breaker with leakage alarm - Google Patents

Abstract

The circuit breaker has an alarm switch (12) to emit a leakage alarm by free activation of a triggering unit (16) when default current circulates along an electric path. A cam type manipulating lever (20) connects a manipulating end element of the unit to a leakage indication button (13). The lever locks and retains the button at a pressed position in a normal state and releases the button and ejects the button to a leakage indication position in response to activation of the unit. The lever permits free activation of the unit in a locked state in which the button is pressed.

Description

  The present invention relates to a circuit breaker with an alarm in which a leakage alarm unit is mounted on a breaker body, and more particularly to a configuration of a leakage alarm unit having a trip-free function.

  In an important circuit that does not want to turn off the power even if a leakage accident occurs in the circuit, the circuit breaker with a leakage alarm is used to detect the occurrence of a circuit leakage without using the circuit breaker.

  This circuit breaker with a leakage alarm is equipped with a zero-phase current transformer, a leakage detection circuit, and a leakage alarm relay in the circuit breaker body equipped with overload and short-circuit protection functions. Is known, a circuit breaker with a leakage alarm configured to output a leakage alarm from a leakage alarm relay without disconnecting the circuit is known (see, for example, Patent Document 1). Is shown in FIG.

  In FIG. 15, 1 is a circuit breaker with a leakage alarm connected to a three-phase circuit, 2 is a main circuit (U, V, W phase) of the circuit breaker, 3 is a switching contact of the main circuit 2, and 4 is a main circuit 2. As a primary conductor, a zero-phase current transformer for detecting a ground fault current flowing in the main circuit due to the occurrence of leakage in the electric circuit, 5 is a leakage detection circuit connected to the zero-phase current transformer 4, and 6 is an output side of the leakage detection circuit 5 Connected earth leakage relay, 6a is a relay contact, 7 is a lead wire for earth leakage alarm output pulled out from each terminal of the relay contact 6a, 8 is an LED (Light Emitting Diode) for earth leakage display, 9 is an earth leakage detection circuit 5 A reset button 10 is a leakage test button.

  In the above circuit breaker with a leakage alarm, when a ground fault occurs in the circuit and a ground fault current flows in the main circuit 2, the zero-phase current transformer 4 detects the ground fault current. When the ground fault current exceeds the sensitivity current set in advance by the leakage detection circuit 5, the leakage relay 6 is activated to switch the relay contact 6 a, and a leakage alarm is output to the outside through the output lead wire 7. At the same time, the LED 8 for leakage display provided on the circuit breaker is turned on. Here, the leakage alarm output from the leakage relay 6 and the LED 8 are turned on by pressing the reset button 10 attached to the circuit breaker to cut off the leakage detection signal output from the leakage detection circuit 5 or turning off the power of the electric circuit. It continues until the electrical connection state is released.

  By the way, the above-described circuit breaker with a leakage alarm equipped with the leakage relay 6 has the following problems in terms of function. That is, in an unforeseen state in which the reset button 10 is kept pressed while the circuit breaker is in use (for example, the button is caught in the reset position due to inadequate operation of the reset button and does not automatically return to the set position) If there is a leak in the circuit due to a foreign object hitting the surface of the circuit breaker and the reset button being held in the reset position), the output from the leakage detection circuit 5 stops Therefore, the leakage relay 6 does not operate and the LED 8 does not light up. For this reason, a leakage accident occurring in the electric circuit cannot be accurately detected.

  On the other hand, in response to the above problem, even in an unforeseen state where the reset button of the leakage detection unit is pressed and restrained at the reset position, a leakage accident that has occurred in the electric circuit during this time is correctly detected and a leakage alarm is issued to the outside. A circuit breaker with a leakage alarm whose function is improved so that it can be output is known (see Patent Document 2).

  Next, FIG. 16 shows a circuit diagram of a circuit breaker with alarm disclosed in Patent Document 2. In this circuit breaker with a leakage alarm, a leakage alarm unit having the following assembly is used instead of the leakage relay 6 and the leakage display LED 8 in FIG. That is, a trip coil (electromagnet) 11, an alarm switch (micro switch) 12 that outputs an electric leakage alarm to the outside in conjunction with the operation of the trip coil 11, a pop-up type electric leakage display button 13 that also functions as a reset button, and a trip coil The leakage alarm unit 15 is assembled and configured with a trip-free mechanism 14 that links the movable iron core 11 and the leakage display button 13, and the leakage alarm unit 15 is mounted on the main body case of the circuit breaker for wiring.

Here, the structure and function of the trip-free mechanism 14 are described in detail in Patent Document 2, and a trip bar connected to the leakage indicator button 13, a trip lever linked to the movable iron core of the trip coil 11, a trip bar, It is composed of an assembly of actuators (all not shown) with operating springs that link the trip lever. With this configuration, even when the leakage current display button 13 is pushed into the reset position, if a leakage accident occurs in the electric circuit during this time, the trip coil 11 operates without being interrupted by the leakage display button 13. The alarm switch 12 is switched to output a leakage alarm to the outside through the alarm switch.
JP-A-2-239533 JP 2001-160354 A

  According to the circuit breaker with a leakage alarm of Patent Document 2 described above, even when the leakage indicator button is pushed into the reset position, the trip coil operates to alarm when a leakage accident occurs in the electric circuit. A switch can be switched and a leakage alarm can be output to the outside through the alarm switch. This function is referred to as “trip-free function”.

  However, in the earth leakage alarm unit having the above configuration, the trip-free mechanism that forms the core of the earth leakage alarm unit is an assembly of dedicated parts with a complicated structure and a large number of parts, which makes it difficult to make the earth leakage alarm unit compact and compact. In addition, production costs are also high.

  The present invention has been made in view of the above points, and the object thereof is to solve the above-mentioned problems and divert the main parts of the earth leakage trip unit provided as standard in the existing earth leakage circuit breaker to use only a few dedicated parts. Is to provide a circuit breaker with a leakage alarm provided with a trip-free function similar to that of Patent Document 2 by configuring a small and compact leakage alarm unit at a low cost.

In order to achieve the above object, according to the present invention, a zero-phase current transformer, a leakage detection circuit, and a leakage alarm unit are mounted on a circuit breaker having an overload and short-circuit protection function, and leakage is caused in the electric circuit. A circuit breaker with a leakage alarm that outputs a leakage alarm from the leakage alarm unit without disconnecting the electric circuit when a ground fault current occurs and the leakage alarm unit receives the output signal of the leakage detection circuit. In a trip unit having an operating slider, an alarm switch that outputs an electric leakage alarm in conjunction with the operation of the trip unit, and a pop-up type electric leakage display button that also functions as a reset button,
Wherein when the ground fault current in path in a state pushed leakage display button flows, as trip free mechanism for outputting the leak alarm from the alarm switch is freely operate the trip unit, slider and leakage of the trip unit Linking with the display button, the leakage indicator button is locked and held at the push-in position (set position) at all times, and when the trip unit trips, the leakage indicator button is released and popped up at the leakage indication position. Provided with a cam type operation lever that functions so as not to prevent the free operation of the trip unit even in a restrained state in which the button is pushed into the reset position, the cam type operation lever of the trip free mechanism has a leakage indicator button at its tip A hook-shaped engagement step portion that locks and holds the screw in the set position, an inclined release cam surface that is orthogonal to the engagement step portion, and a tip of the top portion To form an inclined cam surface for resetting, and is pivotally connected to the slider of the trip unit via pivot pins of the vertical axis, a biasing spring (claim 1).
( 1 ) The trip unit includes a movable iron core, a permanent magnet that attracts and holds the movable iron core at a set position, and a plunger type electromagnet that counteracts the magnetic force of the permanent magnet by reverse excitation, and a tip of the movable iron core A slider connected to the shaft and having one end facing the alarm switch, a drive spring (compression coil spring) interposed between the slider and the electromagnet, and a movable iron core that is fitted on the shaft of the movable iron core It consists a return spring which is interposed between the slider (claim 2).
( 2 ) In the preceding item ( 1 ), after the slider is loosely fitted to the tip shaft portion of the movable iron core, a rubber O-ring functioning as an axial sliding resistance member is provided between the tip shaft portion and the slider. It is connected and interconnected (Claim 3 ).
(3) said trip unit, alarm switch, and built-in earth leakage display button on the unit case, further constitutes a leakage alarm unit equipped with a control board that includes a leakage detection circuit to the unit case (claim 4).
( 4 ) The alarm switch is a micro switch that is mounted in a cassette on the unit case, and the actuator of the micro switch is arranged to face the slider tip of the trip unit at this switch mounting position (Claim 5 ).

  In the above configuration, the trip coil, the earth leakage display button that also functions as the reset button, the alarm switch, the earth leakage detection circuit, and the unit case, etc., are equipped as standard in the earth leakage circuit breaker products currently on the market. The parts of the mechanism are diverted, and the earth leakage alarm unit corresponding to the trip-free function is configured by adding parts such as a slider, a cam-type operation lever of the trip-free mechanism, and an O-ring to the trip coil. As a result, the number of parts and the production cost can be reduced as compared with the leakage alarm unit of Patent Document 2 configured by combining newly designed and produced dedicated parts.

  Moreover, since the earth leakage alarm unit of the present invention is configured in a compact size equivalent to the earth leakage trip mechanism provided as standard in the conventional earth leakage breaker, wiring with the same outer size as the main case of the earth leakage breaker Even in a circuit breaker, this leakage alarm unit can be mounted without any problem to constitute a circuit breaker with a leakage alarm.

Here, as a trip-free mechanism, a cam type operation lever is assembled to the slider of the trip unit and linked with the earth leakage display button, so that the trip unit is set and tripped via the cam type operation lever as a single component. , Reset, and trip-free operations, and the structure can be greatly simplified as compared with the above-described trip-free mechanism of Patent Document 2.

Further, the movable iron core of the trip unit, by interconnected by interposed an O-ring which serves as a sliding resistance member in the axial direction between the tip end shaft portion and the slider, the set state from the reset operation The trip unit can be stably reset while suppressing the sudden release of the stored spring force of the drive spring (compression coil spring) during the transition.

Furthermore, by having a leakage alarm unit and leakage detection circuit unit configured assembled collectively housed the components in the unit case by combining related thereto, incorporation structure to circuit breaker is simplified.

Further, by mounting the alarm switch to cassette type unit case of earth leakage alarm unit as a micro switch, alarm switch assembly, maintenance convenience can be achieved.

  Hereinafter, embodiments of the present invention will be described based on examples shown in FIGS. 1 to 4 are assembly structure diagrams of the entire leakage alarm unit, FIGS. 5 to 7 are detailed structure diagrams of the trip unit and the trip-free mechanism, and FIGS. 8 to 10 are a set state and a trip of the leakage alarm unit. 11 to 13 are detailed diagrams showing the set, trip, and reset operation states of the trip unit, and FIG. 14 is a circuit diagram of a circuit breaker with a leakage alarm, corresponding to FIG. The same reference numerals are given to the members to be performed.

  First, the circuit of the embodiment of the present invention shown in FIG. 14 is basically similar to the circuit of the circuit breaker with a leakage alarm disclosed in Patent Document 2 (see FIG. 16). The assembly structure of the trip free mechanism 14 that links the trip coil 11 and the leakage display button 13 and the leakage alarm unit 15 is different from the structure disclosed in Patent Document 2 as described later.

  Next, the assembly structure of the leakage alarm unit according to the embodiment of the present invention is shown in FIGS. The earth leakage alarm unit 15 is roughly divided into a trip unit 16 in which a slider 17 is connected to the trip coil 11, an alarm switch 12 for outputting an earth leakage alarm in conjunction with the operation of the trip coil 11, and a pop-up functioning as a reset button. Type earth leakage display button 13, a cam type operation lever (trip-free mechanism) 20 that is attached to the slider 17 to link the earth leakage display button 13, a control including these components and the earth leakage detection circuit 5. It becomes an assembly with the unit case 21 incorporating the substrate.

  Here, the unit case 21 includes a lower case 21a, an upper case 21b, and a case cover 21c. The lower case 21a is equipped with a trip unit 16, a leakage indicator button 13, and an alarm switch 12, and the upper case 21b is detected for leakage. A unit is configured by mounting a control board (printed board) 23 provided with a circuit 5, a leakage test switch 10a, and a setting switch 22 for rated sensitivity current / operation time.

  Further, as shown in FIG. 5, the trip coil 11 includes a movable iron core 11a, a permanent magnet 11b that attracts and holds the movable iron core at a set position, an exciting coil 11c that counteracts the magnetic force of the permanent magnet 11 by reverse excitation, and a magnetic yoke. 11d is a plunger type electromagnet. Further, a slider 17 is connected to the tip shaft portion of the movable iron core 11a of the trip coil 11, and a drive spring 18 (a compression coil spring) is straddled between the slider 17 and the frame 11e of the trip coil 11. The spring force is set to be smaller than the attractive force of the movable iron core 11a by the permanent magnet 11b), and between the stepped portion of the constricted portion formed on the shaft portion of the movable iron core 11a and the slider 17. A trip unit 16 is constituted by a loosely fitted return spring (coil spring) 19.

  The movable iron core 11a is inserted into a stepped connecting hole 17b drilled in the slider 17 at the front end shaft portion 11a-1, and then the connecting hole 17b drilled in the constricted peripheral surface of the movable iron core 11a and the slider 17. An O-ring 26 made of an elastic material (for example, rubber) that functions as an axial sliding resistance member is interposed between the inner peripheral surface of the movable iron core 11a and the slider 17 via the O-ring 26. They are connected. The shape of the slider 17 is L-shaped, and a leg portion extending laterally is guided and supported by a guide rail formed on the side surface of the lower case 21a of the unit case 21 so as to be slidable in the front-rear direction.

  Further, the pop-up type earth leakage display button 13 has an engaging projection 13a protruding from the base side to the side, and is mounted and supported on the lower case 21a of the unit case 21 in a vertically movable manner in combination with a drive spring (compression coil spring) 13b. ing.

  On the other hand, as shown in FIG. 6, the cam type operation lever 20 which is a core part of the present invention is orthogonal to the engagement step portion 20a protruding in a hook shape at the end of the lever and the bottom surface of the engagement step portion 20a. And a release inclined cam surface 20b formed in the front-rear direction and a reset inclined cam surface 20c formed on the upper surface of the engagement step portion 20a, and a longitudinal through shaft hole 20d formed in the lever base. Become. Then, as shown in FIG. 5, to the slider 17 via an urging spring (torsion coil spring) 25 that presses the support shaft pin 24 and the operation lever 20 toward the engaging protrusion 13a of the electric leakage display button 13. It is mounted so that it can rotate.

  Returning to FIG. 1, the alarm switch 12 is a micro switch in which an actuator protrudes from the lower surface of the case and the lead wire 7 is pulled out from the upper portion. The pocket-shaped recess formed on the side surface of the lower case 21 a of the unit case 21. Insert into the cassette type and install. In this mounting position, the tip 17a (see FIG. 5) of the slider 7 passes through the side wall of the unit case 21 and faces the actuator of the alarm switch 12.

  FIGS. 7A to 7C are assembly diagrams showing the linkage between the trip unit 16 of the leakage alarm unit 15 and the leakage display button 13. Here, in the illustrated state (set state) in which the movable iron core 11a of the trip coil 11 is attracted and held at the set position and the leakage indicator button 13 is pushed in, the engaging step portion 20a of the cam type operation lever 20 mounted on the slider 17 is shown. Overlaps with the engagement protrusion 13a of the leakage indicator button 13 and holds the leakage indicator button 13 in the pushed position.

  Next, the set state of the leakage alarm unit 15 and the trip and trip-free operations will be described with reference to FIGS. FIGS. 11 to 13 show the states of the trip unit corresponding to the set, trip operation, and reset operation.

  First, FIGS. 8 (a) to 8 (e) and FIGS. 11 (a) and 11 (b) show a set state in a steady state (see FIG. 7). In this set state, the slider 17 connected to the movable iron core 11a of the trip coil 11 is attracted to the left side of the drawing and attracted and held by the permanent magnet 11b, and the tip 17a of the slider 17 turns on the alarm switch 12 at this attracting position. At the same time, the engagement step portion 20a of the cam type operation lever 20 mounted on the slider 17 engages with the engagement protrusion 13a of the leakage display button 13 and restrains and holds it at the set position where the display button is pushed.

  If leakage occurs in the electric circuit from this state and a ground fault current flows in the main circuit 2 of the circuit breaker 1 for wiring (see FIG. 14), the zero-phase current transformer 4 detects this ground fault current, and the leakage detection circuit 5 The coil 11c of the trip coil 11 is reversely excited through. As a result, the magnetic force of the permanent magnet 11b is canceled, the slider 17 connected to the movable core 11a receives the spring force of the drive spring 18 and moves to the trip position in FIG. (Electrical signal) is output to the outside (see FIG. 10E). In this case, the movable iron core 11a connected to the slider 17 also moves to the trip position together with the slider (see FIGS. 12A and 12B). At the same time, the cam-type operation lever 20 mounted on the slider 17 rotates clockwise against the biasing spring 25 while pressing the release inclined cam surface 20b against the engagement protrusion 13a of the leakage indicator button 13. The engagement between the engagement step portion 20a and the engagement protrusion 13a is released.

  As a result, the earth leakage display button 13 is released from the restraint of the push-in and is popped up by the spring force of the drive spring 13b, and the tip of the button protrudes upward from the circuit breaker case to indicate that the earth leakage has occurred. Further, when the engaging protrusion 13a of the earth leakage display button 13 moves upward from the cam type operation lever 20 by this pop-up operation, the operation lever 20 receives the spring force of the biasing spring 25 and rotates counterclockwise. It sinks under the mating protrusion 13b. In the trip operation of the leakage alarm unit 15, only a leakage alarm is issued, and the main circuit contact 3 of the circuit breaker 1 for wiring is kept closed and the electric circuit is not interrupted.

  Then, after confirming the leakage alarm due to the trip operation and checking and repairing the cause of the leakage of the electric circuit, when the operator presses the leakage display button 13 protruding from the circuit breaker case and performs a reset operation, the trip unit 16 It operates as follows and returns to the original set state. That is, when the earth leakage display button 13 is pushed in from the trip operation state of FIG. 9, the engagement protrusion 13a pushes the reset inclined cam surface 20c of the cam type operation lever 20 from above. As a result, the slider 17 moves to the left as shown in the figure while compressing the drive spring 18, and when the slider 17 pushes back the movable core 11a of the trip coil via the return spring 19, the movable core 11a returns to the set position. It is attracted and held by the permanent magnet 11b. In the reset operation process, the O-ring 26 mentioned above slides on the inner peripheral surface of the connecting hole 17b of the slider 17 and moves to the position shown in FIG.

  Further, when the earth leakage display button 13 is pushed deeper from the position shown in FIG. 13, the engagement protrusion 13a gets over the flange tip of the engagement step portion 20a formed on the cam type operation lever 20, and enters the lower inclined cam surface 20b. Abut. At the same time, in response to the spring force of the drive spring 18 stored by the reset operation, the slider 17 moves rightward and returns to the initial set state.

  In this case, the spring force stored in the drive spring 18 is instantaneously released, and this release spring force transiently overcomes the magnetic force of the permanent magnet 11b that holds the movable core 11a of the trip coil 11 by suction. If this happens, the movable iron core 11a connected to the slider 17 may move to the trip position, causing the earth leakage display unit to trip. In this respect, in the illustrated embodiment, an O-ring 26 that functions as a sliding resistance member is interposed between the tip shaft portion of the movable iron core 11 a and the slider 17, and this O-ring 26 covers the hole inner peripheral surface of the slider 17. By sliding, the instantaneous release of the spring force of the drive spring 18 that pulls the movable core 11a away from the permanent magnet 11b via the slider 17 is braked. As a result, the slider 17 returns to the set position while the movable iron core 11a is attracted and held at the set position, and a series of reset operations can be performed safely.

  Next, trip-free operation of the leakage alarm unit, which is the main object of the present invention, will be described with reference to FIGS. That is, as shown in FIG. 10A, a foreign object 27 (for example, a door of a panel in which a circuit breaker for wiring is placed) hits on the earth leakage display button 13, and the earth leakage display button 13 is restrained at the pushing position. In this state, when a leakage occurs in the electric circuit and the trip coil 11 is reversely excited, the slider 17 moves toward the trip position by receiving the spring force of the drive spring 18 (see FIG. 5). In this case, the cam-type operation lever 20 mounted on the slider 17 is rotated clockwise as the release inclined cam surface 20b is pushed away by the engaging projection 13a of the leakage display button (see FIG. 10B). As a result, the slider 17 moves to the trip position without being disturbed by the leakage display button 13 while the side surface of the cam type operation lever 20 is overlapped with the engagement protrusion 13a (see FIG. 10D), and an alarm is issued. Switch 12 is turned OFF. As a result, the leakage display button 13 remains depressed and does not function as a leakage display, but a leakage alarm can be output to the outside through the alarm switch 12.

  As can be seen from the above description, according to the leakage alarm unit 15 of the illustrated embodiment, the cam type operation lever 20 which is a single structural component described with reference to FIGS. By attaching to (slider 17) and linking with the earth leakage display button 13, the earth leakage alarm unit can be set, tripped, reset, and trip-free operation via this cam type operation lever 20. .

  In addition, its structure requires fewer parts than the trip-free mechanism disclosed in the above-mentioned Patent Document 2, and components such as a trip coil and an earth leakage display button are standard on existing earth leakage circuit breakers. Parts can be used as they are and can be manufactured at low cost. As shown in FIG. 1, in the assembly structure of the illustrated embodiment, the control board equipped with the leakage detection circuit 5, the test button 10, the sensitivity current / operation time setting switch 22 and the like together with the components of the leakage alarm unit 15 By mounting the unit 23 on the unit case 21 and configuring the unit, the entire device can be reduced in size and size, and the unit can be easily installed as an optional accessory in the circuit breaker.

1 is an exploded perspective view showing an assembly structure of a leakage alarm unit according to an embodiment of the present invention. 1 is an external perspective view of the assembled state of FIG. Side view of FIG. XX cross-sectional view in FIG. FIG. 1 is an exploded perspective view of the trip unit and the electric leakage display button in FIG. FIG. 5 is an external perspective view showing the detailed structure of the cam type operation lever in FIG. 5A is a side view, FIG. 5B is a bottom view of the main part in FIG. 5A, and FIG. 5C is a sectional view taken along line XX in FIG. FIG. 2 is a set state diagram of a leakage alarm unit according to the embodiment of the present invention, in which (a) is a side view of the front end of the unit, (b) and (c) are perspective views and bottom views of the trip unit, and (d) is in (c). Enlarged view of part A, (e) is a circuit diagram of the alarm switch FIG. 3 is a trip operation state diagram of the leakage alarm unit of the embodiment of the present invention, where (a) is a side view of the front end of the unit, (b) and (c) are perspective views and bottom views of the trip unit, and (d) is (c). Figure A is an enlarged view of part A, (e) is a circuit diagram of the alarm switch FIG. 4 is a trip-free operation state diagram of the leakage alarm unit according to the embodiment of the present invention, where (a) is a side view of the front end of the unit, (b) and (c) are perspective views and bottom views of the trip unit, and (d) is (c) ) Enlarged view of part A, (e) is a circuit diagram of the alarm switch FIG. 9 is a detailed view of the trip unit corresponding to the set state of FIG. 8, (a) is a cross-sectional view of the trip unit assembly viewed from the bottom surface side, and (b) is an enlarged view of P part of (a). FIG. 10 is a detailed view of the trip unit corresponding to the trip state of FIG. 9, (a) is a cross-sectional view of the trip unit assembly viewed from the bottom side, and (b) is an enlarged view of a P part of (a). It is a detailed view of the trip unit corresponding to the reset operation state, (a) is a cross-sectional view of the trip unit assembly viewed from the bottom side, (b) is an enlarged view of P part of (a) The circuit diagram of the circuit breaker for wiring with a leakage alarm according to an embodiment of the present invention Circuit diagram of a circuit breaker with a leakage alarm equipped with a conventional leakage relay Circuit diagram of a circuit breaker with a leakage alarm equipped with a conventional leakage alarm unit

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Circuit breaker with earth leakage alarm 2 Main circuit 4 Zero phase current transformer 5 Earth leakage detection circuit 11 Trip coil 11a Movable core 11b Permanent magnet 11c Excitation coil 12 Alarm switch 13 Earth leakage display button 13a Engagement protrusion 13b Button drive spring 14 Trip free mechanism 15 Earth leakage alarm unit 16 Trip unit 17 Slider 18 Drive spring 19 Return spring 20 Cam type operation lever 20a Engagement step 20b Release inclined cam surface 20c Reset inclined cam surface 21 Unit case 23 Control board 24 Cam type operation Lever support pin 25 Energizing spring of cam type operation lever 26 O-ring

Claims (5)

A circuit breaker with overload and short-circuit protection function is equipped with a zero-phase current transformer, a leakage detection circuit, and a leakage alarm unit. When a ground fault occurs due to leakage in the circuit, the circuit is disconnected. A circuit breaker with a leakage alarm that outputs a leakage alarm from the leakage alarm unit without
The leakage alarm unit includes a trip unit having a slider that operates in response to an output signal of a leakage detection circuit, an alarm switch that outputs an leakage alarm to the outside in conjunction with the operation of the trip unit, and a pop-up type that also serves as a reset button In what consists of a leak indicator button,
Wherein when the ground fault current in path in a state pushed leakage display button flows, as trip free mechanism for outputting the leak alarm from the alarm switch is freely operate the trip unit, slider and leakage of the trip unit Linking with the display button, the leakage indicator button is locked and held at the pushing position at all times, the leakage indicator button is released by the trip unit operation and popped up at the leakage indication position, and the leakage indicator button is kept depressed. A cam-type operating lever that functions so as not to hinder the free operation of the trip unit even in a restricted state of the trip unit is provided , and the cam-type operating lever of the trip-free mechanism locks and holds the leakage indication button at the set position at the tip thereof. Forming a hook-shaped engagement step portion, an engagement release inclined cam surface orthogonal to the engagement step portion, and a reset inclination cam surface at the top end; and Pivot pin axis, earth leakage circuit breaker for the alarm with wires, characterized in that pivotally connected to the slider of the trip unit through a biasing spring.   2. The circuit breaker with a leakage alarm according to claim 1, wherein the trip unit includes a movable iron core, a permanent magnet that attracts and holds the movable iron core at a set position, and an exciting coil that counteracts the magnetic force of the permanent magnet by reverse excitation. A plunger type electromagnet, a slider connected to the tip shaft of the movable iron core and having one end opposed to the alarm switch, a drive spring interposed between the slider and the electromagnet, and an axis of the movable iron core A circuit breaker with a leakage alarm, characterized by comprising a return spring inserted and interposed between the slider and a slider. 3. The circuit breaker with a leakage alarm according to claim 2 , wherein the slider is loosely fitted to the tip shaft portion of the movable iron core, and functions as an axial sliding resistance member between the tip shaft portion and the slider. A circuit breaker with a leakage alarm, characterized by being interconnected via an O-ring.   The circuit breaker with a leakage alarm according to claim 1, wherein a trip unit, an alarm switch, and a leakage indicator button are incorporated in a unit case of the leakage alarm unit, and a control board including a leakage detection circuit is mounted on the unit case. A circuit breaker with a leakage alarm, characterized by comprising a leakage alarm unit. 5. The circuit breaker with a leakage alarm according to claim 4 , wherein the alarm switch is a micro switch mounted in a cassette type on the unit case, and the micro switch actuator is opposed to the tip of the slider of the trip unit at the switch mounting position. A circuit breaker with a leakage alarm, characterized by being placed.

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