JP2018206497A - Circuit breaker and safety device unit for circuit breaker - Google Patents

Abstract

To solve such problems that, while, in some circuit breakers, as trip means, an opening is provided to a bottom surface of a housing and a safety device including an actuator for actuating an opening/closing mechanism when a circuit breaker is removed from an attaching/fixing part is mounted to the opening, it was necessary to provide an opening to a bottom surface of a circuit breaker and to secure an arrangement space at the inside thereof, and it was also difficult to ensure insulation around the opening of the bottom surface and to take measures for airtightness in circuit breaking.SOLUTION: In a safety device, a safety device unit is configured to be detachable freely, the safety device unit including: an actuator urged by an elastic member in a direction to actuate a trip unit of a circuit breaker; and a rod which is formed to protrude from a base bottom surface by an urging force from the actuator and which locks, in a state where protrusion is pushed back, the actuator in a position where the trip unit is not actuated.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a circuit breaker such as a circuit breaker for wiring or a leakage breaker, and more particularly to a safety device that automatically trips a circuit breaker in order to prevent dangerous work in a live state. It is.

In the connection method called the circuit breaker plug-in type, there is a risk of electric shock or arc discharge when the main body is removed in the live state, so a safety device (SAFETY DEVICE) that detects and lifts off the mounting plate. ) Needs.
Also, in the connection method called surface type, the terminal screw that is a conductive part is located near the operation handle of the circuit breaker, so in a general switchboard, the wire connection part is protected by a shielding plate called a decorative board. When you open the decorative plate, you need to be careful.

  As a means for sensing and tripping the lifting of the main body, for example, an opening is provided on the bottom of the casing of the circuit breaker, and it is integrated with a rod that moves when the circuit breaker is removed from its mounting and fixing portion, Some safety devices including an actuator that operates an opening / closing mechanism in response to the rod are inserted into the opening (see, for example, Patent Document 1).

JP-A-8-185782 (FIG. 2)

In such a conventional circuit breaker, it is necessary to provide an opening on the bottom surface of the circuit breaker and to secure a space for arranging the rod and the actuator inside.
Furthermore, it is difficult to secure insulation around the opening on the bottom surface and to take measures for airtightness at the time of circuit interruption, and there is a problem that the interruption performance as a circuit breaker is lowered.

  The present invention has been made to solve the above-described problems, and relates to a structure for adding a function of a safety device while avoiding an internal change of a circuit breaker.

  A circuit breaker according to the present invention comprises a housing, an opening / closing contact for opening / closing a circuit, an opening / closing mechanism for driving the opening / closing contact, and a tripping device for operating the opening / closing mechanism in response to an overcurrent. In the circuit breaker provided, the actuator is urged by an elastic member in the direction in which the tripping device is operated, and the urging force from the actuator is configured to be able to protrude from the housing to the outside. A safety device unit for circuit tripping, which is detachably provided on the housing, having a rod that locks the actuator in a position where the tripping device does not operate in a state where the actuator is not operated. .

  According to the present invention, the lifting from the circuit breaker mounting plate (including the lifting from the terminal block when the circuit breaker connection method is a plug-in type) is detected (and the makeup covering the circuit breaker wiring). The circuit breaker that can be attached to and detached from the base or cover without modifying the bottom of the circuit breaker or the opening / closing mechanism is provided by the safety device that operates the tripping device. Can do.

  In addition, in the circuit breaker corresponding to the attachment and detachment of the voltage trip device, the housing for the voltage trip device and the groove for wiring the lead wire are provided in the casing of the circuit breaker such as the base or the cover, The external dimensions of the circuit breaker according to the present invention do not become larger than the conventional one.

It is a perspective view of the circuit breaker of Embodiment 1 of this invention. It is a side view of the circuit breaker of Embodiment 1 of this invention. It is a top view of the circuit breaker of Embodiment 1 of this invention. It is a perspective view of the state which opened the upper cover of the circuit breaker of Embodiment 1 of this invention. It is a perspective view of the state which removed the safety device unit of the circuit breaker of Embodiment 1 of this invention. It is a top view of the state which opened the upper cover of the circuit breaker of Embodiment 1 of this invention. It is the perspective view which showed the inside of the circuit breaker of Embodiment 1 of this invention, and the components in a safety device unit. It is a side view which shows the state with which the circuit breaker of Embodiment 1 of this invention was normally attached. It is a side view which shows the state which the lower rod of the circuit breaker of Embodiment 1 of this invention protruded. It is a figure which shows the lower rod of the circuit breaker of Embodiment 1 of this invention. It is a figure which shows the actuator of the circuit breaker of Embodiment 1 of this invention. It is a perspective view of the circuit breaker of Embodiment 2 of this invention. It is a side view of the circuit breaker of Embodiment 2 of this invention. It is a perspective view of the state which opened the upper cover of the circuit breaker of Embodiment 2 of this invention. It is a perspective view of the state which removed the safety device unit of the circuit breaker of Embodiment 2 of this invention. It is a top view of the state which opened the upper cover of the circuit breaker of Embodiment 2 of this invention. It is the perspective view which showed the inside of the circuit breaker of Embodiment 2 of this invention, and the components in a safety device unit. It is a side view which shows the state in which the decorative board of the circuit breaker of Embodiment 2 of this invention was attached normally. It is a side view which shows the state which the upper rod of the circuit breaker of Embodiment 2 of this invention protruded. It is a figure which shows the upper rod of the circuit breaker of Embodiment 2 of this invention. It is explanatory drawing for demonstrating the reset operation | movement of the circuit breaker of Embodiment 3 of this invention. It is a figure which shows the trip state of the circuit breaker of Embodiment 3 of this invention.

Embodiment 1 FIG.
An example of the circuit breaker according to the first embodiment of the present invention or a component diagram thereof is shown in FIGS.
First, these figures will be described. 1 is a perspective view of the circuit breaker according to the first embodiment, FIG. 2 is a side view of the circuit breaker, FIG. 3 is a top view of the circuit breaker, and FIG. 4 is a perspective view of the circuit breaker with an upper cover opened. FIG. 5 is a perspective view of the circuit breaker with the safety device unit 6 removed, FIG. 6 is a top view of the circuit breaker with the top cover 3 opened, and FIG. 7 is the inside of the circuit breaker and the safety device unit. FIG. 8 is a side view showing a state in which the circuit breaker is normally attached, FIG. 9 is a side view showing a state in which the lower rod 5 of the circuit breaker protrudes, and FIG. 10 is a circuit diagram. FIG. 11 is a view (perspective view, front view, and side view) showing the lower rod 5 of the circuit breaker, and FIG. 11 is a view (perspective view, front view, and side view) showing the actuator 7 of the circuit breaker. The upper rod and the lower rod, which will be described later, are collectively referred to as a rod hereinafter.

The circuit breaker according to the first embodiment includes a base 1 made of an insulating material, a cover 2, an upper cover 3, and the like, an operation handle 4, a rod (specifically, a lower rod 5), and the like. It is included as a component (see FIGS. 1 to 3).
In addition, the circuit breaker includes a safety device unit 6 therein (see FIG. 4). Further, according to FIG. 5, which is a perspective view of the circuit breaker with the safety device unit 6 removed, a cover guide groove 2a is provided on the side surface of the cover 2 (see FIG. 5). It can be seen that the cover is installed using the cover guide groove 2a.

Next, the configuration and operation relating to the circuit breaker switching mechanism will be described below with reference to FIGS.
In relation to the opening / closing mechanism, the actuator 7 is in direct contact with the tripping device in order to change the normal operation from the on operation to the trip operation (see FIGS. 6 to 9). At this time, the actuator 7 changes its position by rotating around a fixed position on the frame 10 serving as a rotation fulcrum by the elastic member 8 (see FIG. 7).
In this case, as shown in FIG. 8, the actuator 7 is attached to the frame 10 by a pin 11 so as to freely rotate.

  In the above, the elastic member 8 urges the actuator 7 in the clockwise direction. The actuator 7 is in contact with the inclined surface 5a of the lower rod 5 at the actuator lower end portion 7a, and biases the lower rod 5 obliquely downward (see FIGS. 9 to 11). Further, a projection 5b guided by the cover guide groove 2a is provided on the side surface of the lower rod 5, and displacement other than the vertical direction is restricted by the cover guide groove 2a (see FIGS. 8 and 10).

  When the circuit breaker is normally attached to the terminal block when the connection method is a plug-in type, or to the mounting plate when the connection type is the front or back type, as shown in FIG. Specifically, since the lower end 5c of the lower rod 5) is designed so as not to protrude below the base 1, the actuator 7 cannot be rotated any further, and the operating portion 7b of the actuator 7 is a tripping device. No contact with 9.

Next, the configuration and operation related to the trip operation will be described below with reference to FIGS.
FIG. 9 shows a state in which the circuit breaker is lifted by removal or the like, and the rod (specifically, the lower rod 5) protrudes. At this time, the inclined surface 5a of the lower rod 5 moves downward so that the actuator lower end 7a. Moves clockwise and the actuating part 7b pushes the tripping device 9, thereby tripping the circuit breaker and opening the switching contact.
As a result, even if the circuit breaker is in an energized state, conduction on the load side is lost and dangerous work can be avoided.

  In FIG. 10, FIG. 10C is a perspective view of the lower rod 5, FIG. 10A is a front view of the lower rod 5, and FIG. 10B is a side view of the lower rod 5. In FIG. 11, FIG. 11C is a perspective view of the actuator 7, FIG. 11A is a front view of the actuator 7, and FIG. 11B is a side view of the actuator 7.

Embodiment 2. FIG.
An example of a circuit breaker according to Embodiment 2 of the present invention, or a component diagram thereof, is shown in FIGS.
12 is a perspective view of the circuit breaker according to the second embodiment, FIG. 13 is a side view thereof, FIG. 14 is a perspective view of the upper cover 3 in an opened state, and FIG. 15 is a perspective view of the safety device unit 6 removed. FIG. 16, FIG. 16 is a top view of the state in which the upper cover is opened, FIG. 17 is a perspective view showing parts in the circuit breaker and the safety device unit, and FIG. FIG. 19 is a side view showing a state in which the upper rod protrudes, FIG. 19 is a side view showing a state in which the upper rod protrudes, and FIG. 20 is a view showing the upper rod.

  In the first embodiment, the safety device unit in the case where the back surface of the circuit breaker is attached to the board surface is shown. However, in this embodiment, the lifting of a decorative board (not shown) that covers the circuit breaker wiring is detected. The safety device unit will be described below.

In the circuit breaker of the present embodiment, the upper rod 12 is used instead of the lower rod shown in the first embodiment (see FIGS. 12 to 17).
The actuator 7 is in contact with the engaging portion 12a of the upper rod 12 at the horizontal portion 7c, and biases the upper rod 12 upward (see FIG. 18).
A projection 12b guided by the cover guide groove 2a is provided on the side surface of the upper rod 12, and displacement other than the vertical direction is regulated by the cover guide groove 2a (see FIG. 18).

  When a decorative board (not shown) is normally attached to the circuit breaker, the upper end portion 12c of the rod (specifically, the upper rod 12) cannot protrude upward, so that the actuator 7 can be rotated further. It cannot move, and the operation part 7b of the actuator 7 does not contact the tripping device 9 (see FIG. 18).

FIG. 19 shows a state in which the decorative board (not shown) of the circuit breaker is opened and the rod (specifically, the upper rod 12) protrudes upward. At this time, the engaging portion 12a moves upward. As a result, the horizontal portion 7c of the actuator 7 rotates clockwise, and the operating portion 7b of the actuator 7 pushes the tripping device 9.
As a result, the circuit breaker trips, so that even if the circuit breaker is in an energized state, there is no continuity on the load side, and dangerous work can be avoided.
20 is a view showing the upper rod, FIG. 20 (c) is a perspective view of the upper rod, FIG. 20 (a) is a front view thereof, and FIG. 20 (b) is a side view thereof.

Embodiment 3 FIG.
FIG. 21 is an explanatory diagram for explaining the reset operation of the circuit breaker according to the third embodiment of the present invention, and FIG. 22 is a diagram showing a trip state of the circuit breaker.
In the present embodiment, the operation handle 4 is provided with a handle protrusion 4 a that engages with the reset lever 13.

  Next, the reset operation of the circuit breaker will be described with reference to FIGS. FIG. 21 shows a case where the operation handle 4 is in the “on state” position. As shown in this figure, the operation handle 4 is provided with a handle protrusion 4 a that engages with the reset lever 13, and the reset lever 13 is provided with a drive portion 13 a that abuts against the actuator 7. Then, from the trip state shown in FIG. 22 (in this case, the position of the operation handle 4 is at a position indicated by a solid line: Tp) to the position indicated by a broken line (the same as a reset position described later: Tr). The operation handle 4 is manually moved (off operation) so that the actuator 7 can be moved to the reset position where the actuator 7 is tripped and does not contact the device 9.

At this time, by arranging the latch 14 biased in the direction of locking the reset lever 13, the reset lever 13 can be used together with the reset lever 13 even after the operation handle 4 is moved to the ON side (see the operation handle position shown in FIG. 21). The actuator 7 is locked at the reset position.

  The upper rod 12 biased upward is engaged with the latch, and the latch release direction and the reset lever biasing direction are made closer to 90 °, thereby the rod (specifically, the upper rod 12 here). The load that pushes back so as not to protrude can be made smaller than the load required to trip the trip device.

  A general circuit breaker is provided with a cover guide groove 2a of FIG. 5 in the cover 2 so that the terminal block of the accessory device can be fixed, but the lower rod 5 or the upper rod 12 has a protrusion 5b, Alternatively, by providing the protrusion 12b, it is possible to prevent dropout and displacement, and it is possible to attach the safety device unit without increasing the outer dimension in the width direction.

  A general circuit breaker has a space for storing the accessory device in the cover or base. However, by configuring the safety device unit to fit in the storage space, the external shape of the circuit breaker after installation The dimensions do not increase.

In addition, in a general circuit breaker, the circuit breaker is electrically tripped by a command from a distance, that is, away from the circuit breaker, so that a voltage trip device (shunt trip ( The tripping device of the circuit breaker can be mounted by making the operating portion 7b of the actuator 7 of the safety device unit the same shape as the operating portion of the voltage tripping device. The safety device unit can be operated without changing the specifications.

  Further, the actuator 7 is provided with an actuator lower end 7a that is an engaging portion with the lower rod 5 and a horizontal portion 7c that is an engaging portion with the upper rod 12 (see FIG. 11). By sharing the parts, the safety device unit can cope with both the floating of the circuit breaker and the opening of the decorative plate only by replacing the lower rod 5 and the upper rod 12.

  It should be noted that the present invention can be freely combined with each other within the scope of the invention, and each embodiment can be appropriately modified or omitted.

  1 base, 2 cover, 2a cover guide groove, 3 upper cover, 4 operation handle, 4a handle projection, 5 lower rod, 5a slope, 5b projection, 5c lower end, 6 safety device unit, 7 actuator, 7a actuator lower end, 7b Actuator, 7c Horizontal part, 8 Elastic member, 9 Tripping device, 10 Frame, 11 Pin, 12 Upper rod, 12a Engagement part, 12b Projection, 12c Upper end part, 13 Reset lever, 13a Drive part, 14 Latch

Claims (9)

In a circuit breaker comprising a housing, an opening / closing contact for opening / closing a circuit, an opening / closing mechanism for driving the opening / closing contact, and a tripping device for operating the opening / closing mechanism in response to an overcurrent,
An actuator urged by an elastic member in a direction to operate the tripping device;
A rod that is configured to be able to protrude outward from the housing by the urging force from the actuator, and in a state where the actuator does not protrude outward from the housing, the actuator is tripped and locked to a position where the device does not operate,
A circuit breaker comprising: a safety device unit for circuit tripping, which is detachably attached to the housing.   When the rod is a lower rod, the rod is configured to project from the bottom surface of the housing, and when the rod is an upper rod, the rod is configured to project from the upper shielding surface of the housing. The circuit breaker according to claim 1. In a circuit breaker comprising a housing, an opening / closing contact for opening / closing a circuit, an opening / closing mechanism for driving the opening / closing contact, and a tripping device for operating the opening / closing mechanism in response to an overcurrent,
An actuator urged by an elastic member in a direction to operate the tripping device;
A reset lever for driving the actuator to a reset position where the tripping device is not activated by an off operation of an operation handle of the opening / closing mechanism;
A latch that locks the reset lever at the reset position;
A rod configured to be able to protrude from the upper shielding surface of the housing by an urging force from the actuator, and when protruding from the upper shielding surface of the housing, the rod is driven to release the reset lever. When,
A circuit breaker comprising: a safety device unit for tripping a circuit having a detachable attachment to the housing.   4. A guide groove for moving the safety device unit is provided on a side surface of the housing, and the rod has a protrusion configured to correspond to the guide groove. Circuit breaker according to item.   The circuit breaker according to any one of claims 1 to 3, wherein a space for housing the safety device unit is provided on an upper surface, a side surface, or an inside of the casing.   The space for housing the safety device unit of the housing is configured to be shared with a storage space for a voltage trip device that electrically trips the circuit breaker according to a command from a location away from the circuit breaker. The circuit breaker according to claim 5. Used in a circuit breaker comprising a housing, an opening / closing contact for opening / closing a circuit, an opening / closing mechanism for driving the opening / closing contact, and a tripping device for operating the opening / closing mechanism in response to an overcurrent A safety device unit,
An actuator urged by an elastic member in a direction to operate the tripping device;
A rod configured to be able to protrude from the housing by the urging force from the actuator, and in a state where the actuator does not protrude from the outermost surface of the circuit breaker, a rod that locks the actuator at a position where the trip device does not operate,
And a circuit breaker safety device unit, wherein the circuit breaker is configured to be freely attached to and detached from the circuit breaker. When the rod is a lower rod, the rod is configured to project from the bottom surface of the housing, and when the rod is an upper rod, the rod is configured to project from the upper shielding surface of the housing. The safety device unit for a circuit breaker according to claim 7.   The actuator includes both a portion that engages with the lower rod and a portion that engages with the upper rod, and the lower rod or the upper rod is configured to be attachable. The circuit breaker safety device unit according to claim 8.

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