JP6796542B2 - Circuit breaker for wiring - Google Patents

Description

The present invention relates to a molded case circuit breaker installed in a distribution board or the like, and more particularly to a molded case circuit breaker in which terminals are arranged in a row in the height direction of the circuit breaker housing to form a narrow width.

There is a molded case circuit breaker in which the power supply side terminal and the load side terminal are arranged in a row in the housing height direction of the circuit breaker to narrow the width of the housing. For example, in the molded case circuit breaker disclosed in Patent Document 1, a plug-in type is adopted for the power supply side terminal and a quick connection terminal is adopted for the load side terminal, and the width of the housing is reduced to about half of the conventional one. There is.
FIG. 6 is a perspective view of this conventional molded case circuit breaker, in which the load side terminals 30 are vertically arranged in a row on the inclined front surface, and the electric wires inserted into the quick-connect terminals are released from the lock at the upper end. A lever 31 is provided, and a measuring hole 32 for measuring insulation resistance is provided directly below each load-side terminal.

Japanese Patent No. 4813957

In the above-mentioned conventional molded case circuit breaker, since the measurement hole 32 is arranged on the same surface as the load side terminal 30, the measurement hole is not blocked even when assembled to the distribution board, and the probe is inserted to insulate. The resistance could be measured.
However, as shown in FIG. 6, since the measurement hole 32 is provided directly below the load side terminal 30, it is difficult to confirm the measurement hole 32 when the electric wire is connected. In particular, when assembled in the distribution board, the front surface of the circuit breaker is installed facing up or down, so it is difficult to check and the measurement work is troublesome.

Therefore, in view of such a problem, it is an object of the present invention to provide a molded case circuit breaker in which the measurement hole can be easily visually recognized even when the electric wire is inserted into the load side terminal and the probe can be easily inserted.

In order to solve the above problems, the invention of claim 1 is an operation handle for turning on / off the output of a plurality of power supply side terminals on the back surface of the circuit breaker housing, a plurality of load side terminals on the front surface, and a load side terminal on the upper surface. Are arranged, the load side terminals are arranged vertically in a row, and they are composed of quick connection terminals that are connected simply by inserting an electric wire, and an overcurrent is applied to the electric circuit between the power supply side terminal and the load side terminal. It is a circuit breaker for wiring that has a circuit breaker function that cuts off the electric circuit when it flows, and a measurement hole for measuring insulation resistance is provided near each load side terminal on the front of the circuit breaker housing. It is characterized in that it is not on the row of load side terminals but is arranged at a position shifted to the left or right.
According to this configuration, the measurement holes are not on the row where the load side terminals are arranged, but are arranged at offset positions, so that the measurement holes can be visually recognized from above even if the electric wire is connected to the load side terminals. It is easy to check the measurement hole from the front even when it is assembled on the distribution board.

In the invention of claim 2, in the configuration according to claim 1, the front surface of the circuit breaker housing is formed to be inclined so as to face diagonally upward, and the concave portion and the convex portion are formed in the vertical direction according to the number of load side terminals. It is characterized in that it is periodically arranged in a stepped shape, and individual wire insertion holes of the load side terminals are formed in recesses, and individual measurement holes are formed in the upper part of the protrusions.
According to this configuration, since the measurement hole is formed on the upper portion of the convex portion on the front surface of the circuit breaker housing which is inclined, it is easy to see from above.

The invention according to claim 3 is characterized in that, in the configuration according to claim 1 or 2, the measuring holes are arranged diagonally below or diagonally above the load-side terminal.
According to this configuration, the terminal hole into which the electric wire of the load side terminal is inserted and the measurement hole can be arranged without being greatly separated even if they are laterally shifted, and the measurement hole can be formed without changing the width of the conventional circuit breaker housing. ..

According to the present invention, since the measurement holes are not on the row in which the load side terminals are arranged but are arranged at offset positions, the measurement holes can be easily visually recognized from above even if the electric wires are connected. Therefore, it is easy to check the measurement hole from the front even when it is assembled on the distribution board.

It is a perspective view which shows an example of the molded case circuit breaker which concerns on this invention. It is an enlarged view of part A, (a) shows the state in which an electric wire is inserted, and (b) shows the state before the electric wire is inserted. It is a plan view of FIG. 1, (a) shows a state in which an electric wire is not inserted, and (b) shows a state in which an electric wire is inserted. It is a side view of the circuit breaker for wiring. It is a partial side view which see through the inside. It is a perspective view of the conventional molded case circuit breaker.

Hereinafter, embodiments embodying the present invention will be described in detail with reference to the drawings. 1-3 shows an example of a molded case circuit breaker according to the present invention, FIG. 1 is a perspective view, FIG. 2 is an enlarged view of part A, and FIG. 3 is a plan view. As shown in the figure, the molded case circuit breaker 1 is provided with a power supply side terminal 2 on the back surface of the circuit breaker housing 10, and a load side terminal 3 is formed on the front surface. Further, on the upper surface of the circuit breaker housing 10, an operation handle 4 for turning on / off the output of the load side terminal 3 and a release lever 5 for pulling out the electric wire 8 forming the branch electric line inserted in the load side terminal 3 are provided. Each load-side terminal 3 is provided with a measurement hole 6 for measuring insulation resistance in the vicinity.

The poles of the power supply side terminal 2 and the load side terminal 3 are connected by an internal electric circuit provided with an opening / closing contact (not shown) in the middle, and the opening / closing contact is opened / closed by operating the operation handle 4 to the load side. The output on / off operation of the terminal 3 is performed. Further, the circuit breaker housing 10 incorporates an overcurrent detecting means for detecting an overcurrent flowing through the internal electric circuit, and a breaking mechanism for opening the open / close contact when the overcurrent flows to cut off the electric circuit. ..

The power supply side terminal 2 has three copper bar gripping portions P1, P2, and P3 in the vertical direction so as to grip and connect copper bars (not shown) arranged in three layers of a single-phase three-wire electric circuit. The upper copper bar grip portion P1 is a neutral pole terminal, and the central and lower copper bar grip portions P2 and P3 are voltage pole terminals. Each power supply side terminal 2 has a U-shaped terminal fitting, and is formed as a plug-in type terminal that can be connected by simply inserting a conductor bar (not shown) arranged in a distribution board or the like. ing.

The load-side terminal 3 is composed of three terminal holes L1, L2, L3 that are vertically arranged and into which the electric wire 8 is inserted, and the electric wire 8 inserted inside each of the terminal holes L1, L2, L3 is electrically inserted. The terminal fittings to be connected are arranged. The electric wire 8 is used by inserting the electric wire 8 into two specific terminal holes among the three terminal holes L1, L2, and L3, but in FIG. 1 and the like, the three electric wires 8 are connected to the load side terminal 3 for convenience of explanation. Indicates the state.
The three terminal holes L1, L2, and L3 are arranged in a row in the vertical direction. The central terminal hole L2 is a neutral pole terminal hole, and the upper terminal hole L1 and the lower terminal hole L3 are voltage pole terminal holes. It has become.

By vertically arranging the plug-in type power supply side terminal 2 and the load side terminal 3 including the quick connection terminal in this way, the circuit breaker housing 10 is a quadrangular box, but the width is as thin as about 10 cm. It is formed. Further, the front surface on which the load side terminal 3 is arranged is formed to be inclined so as to face diagonally upward so that it can be easily seen from the front in a state of being assembled to the distribution board. In the state of being assembled to the distribution board, the upper surface provided with the operation handle 4 is directed forward.

The measurement holes 6 are provided for each of the load-side terminals 3 and are provided in the vicinity of the terminal holes L1, L2, and L3. Specifically, they are formed diagonally below (lower left) of the individual terminal holes L1, L2, and L3, and the rows of measurement holes 6 are arranged adjacent to and parallel to the rows of load-side terminals 3.
M1 shown in the plan view of FIG. 3 shows the center line of the row of the measurement holes 6, and M2 shows the center line of the row of the load side terminals 3 (rows of the terminal holes L1, L2, L3), and both rows. Indicates that they are arranged in parallel in close proximity.

Further, the front surface of the circuit breaker housing 10 is provided with periodic irregularities in the vertical direction according to the positions of the individual terminal holes L1, L2, L3, and the forming portion of the load side terminal 3 is composed of three steps and has a stepped shape. It is formed. Then, a load-side terminal 3 is formed in each recess D1, and a measurement hole 6 is formed in each convex portion D2.
The load-side terminal 3 is formed by drilling terminal holes L1, L2, and L3 in each recess D1 in a direction orthogonal to the inclined front surface of the circuit breaker housing 10, and the measurement hole 6 is formed on the upper surface 9 of each convex portion D2. It is recessed downward.

4 and 5 are side views of the molded case circuit breaker 1, FIG. 4 shows the insertion angle of the electric wire 8, and FIG. 5 is a partial view of the inside and shows the insertion angle of the probe 20. As shown in FIGS. 4 and 5, terminal holes L1, L2, and L3 are formed in the load side terminal 3 so that the electric wire 8 is inserted from diagonally above perpendicular to the front surface of the circuit breaker housing 10, and the measurement holes 6 are formed. The probe 20 is formed so as to be inserted downward from the vertical direction orthogonal to the upper surface of the circuit breaker housing 10.
Further, the terminal metal fittings constituting the load side terminal 3 are composed of an electric wire connection metal fitting 11 forming a quick connection terminal and a terminal seat metal fitting 12 integrally formed with an internal electric circuit, and are inserted as shown in FIG. The probe 20 is configured to come into contact with the end of the terminal seat bracket 12. The terminal seat metal fitting 12 is formed so as to be arranged obliquely upward, and its end portion is formed by being bent in the horizontal direction, and is arranged at the bottom of the recessed measurement hole 6. As a result, the tip of the probe 20 inserted from above comes into good contact with the terminal seat bracket 12.

The electric wire connecting metal fitting 11 is composed of a connecting spring 11a that is electrically connected to the inserted electric wire 8 and a retaining spring 11b that prevents the electric wire from coming off while being connected to the connecting spring 11a. The electric wires 8 inserted through the holes L1, L2, and L3 are electrically connected without performing a connecting operation such as screwing. Further, the electric wire connecting metal fitting 11 is arranged above the terminal seat metal fitting 12, and is arranged so as to be in close contact with the terminal seat metal fitting 12.

As described above, since the measurement holes 6 are not on the row in which the load side terminals 3 are arranged but are arranged at offset positions, it is easy to visually recognize the measurement holes 6 from above even if the electric wires 8 are connected. It is easy to check the measurement hole 6 from the front even when it is assembled to the distribution board.
Further, since the measurement hole 6 is arranged diagonally below the terminal holes L1, L2, L3, the terminal holes L1, L2, L3 into which the electric wire 8 of the load side terminal 3 is inserted and the measurement hole 6 may be laterally displaced. The measurement holes 6 can be formed without changing the width of the conventional circuit breaker housing 10 because they can be arranged without being greatly separated.
Further, since the measurement hole 6 is formed on the upper portion of the convex portion D2 on the front surface of the inclined circuit breaker housing 10, it is easy to see from above. In addition, since the measurement hole 6 is recessed downward, the measurement can be easily performed by inserting the probe 20 from above, that is, from the front when the probe 20 is assembled to the distribution board.

In the above embodiment, the measurement hole 6 is provided diagonally below the corresponding load-side terminal 3, but may be provided diagonally above. Further, although it is provided at the lower left of the load side terminal 3, it may be at the lower right.

1 ・ ・ Circuit breaker for wiring, 2 ・ ・ Power supply side terminal, 3 ・ ・ Load side terminal (quick connection terminal), 4 ・ ・ Operation handle, L1, L2, L3 ・ ・ Terminal hole (electric wire insertion hole), 6 ・・ Measurement hole, 8 ・ ・ Electric wire, 9 ・ ・ Top surface, 10 ・ ・ Circuit breaker housing, D1 ・ Recessed part, D2 ・ ・ Convex part.

Claims (3)

A plurality of power supply side terminals are arranged on the back surface of the circuit breaker housing, a plurality of load side terminals are arranged on the front surface, and an operation handle for turning on / off the output of the load side terminal is arranged on the upper surface, and the load side terminals are arranged vertically in a row. In addition to being arranged, it is composed of quick-connect terminals that are connected simply by inserting an electric wire, and has a blocking function that shuts off the electric circuit when an overcurrent flows through the electric circuit between the power supply side terminal and the load side terminal. It is a circuit breaker for wiring
Measurement holes for measuring insulation resistance are provided in the vicinity of the individual load-side terminals on the front surface of the circuit breaker housing.
A molded case circuit breaker characterized in that the measurement holes are not on the row of load-side terminals but are arranged at positions shifted to the left or right. The front surface of the circuit breaker housing is formed to be inclined so as to face diagonally upward, and concave portions and convex portions are periodically arranged in the vertical direction according to the number of load side terminals to form a staircase shape.
The molded case circuit breaker according to claim 1, wherein the individual electric wire insertion holes of the load side terminals are formed in the concave portion, and the individual measurement holes are formed in the upper portion of the convex portion. The molded case circuit breaker according to claim 1 or 2, wherein the measuring hole is arranged diagonally below or diagonally above the load-side terminal.

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