JPH0197342A - Circuit breaker - Google Patents

Abstract

PURPOSE:To secure safety at the time of wiring work by tripping an on-off mechanism of a circuit breaker when a terminal cover at the load side is released, dissociating a movable contact therefrom, and preventing the impression of voltage to a load side terminal from occurring. CONSTITUTION:A lever 12 being energized in direction of pressing a movable core 7 by a spring 22 is installed there as an open detecting means for a cover 10. The lever 12 is rotatably held in a phase-to-phase insulating part of a box body 30 of a breaker, and furthermore a terminal cover detecting part 12b is projected into a mounting hole part 13 of the terminal cover 10. Consequently, in an uninstalled state of the terminal cover 10, since the lever 12 presses the movable core 7 with a pressing part 12a installed in an arm, a circuit breaking part comes into a state of being tripped whereby voltage impression to a load terminal is prevented from occurring, while such a state that is not in ON operation is maintained. When the cover 10 is attached, an engaging part 10a pushes the terminal cover 12b and the lever 12 is pushed up so that the tripped state is released, thus the ON operation is made possible.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to the terminal portion of a circuit breaker, and in particular, to improving safety by preventing voltage from being applied to the terminal during wiring work to the terminal. The present invention relates to a preferred circuit breaker.

[Conventional technology]

In conventional devices, as described in Japanese Utility Model Publication No. 49-18689, the cover of the terminal is locked to prevent anyone other than the operator from accidentally touching the terminal.

[Problem that the invention seeks to solve]

The above conventional technology does not take into consideration the prevention of electric shock accidents when performing wiring work, etc., and if the circuit breaker is accidentally turned on during wiring work, voltage is applied to the terminals, resulting in accidents such as electric shock or ground fault. There was a problem that there was a risk of this occurring. Furthermore, if the terminal cover is forgotten to be attached after the wiring work is completed, there is a problem in that the live parts are exposed and there is a risk of electric shock.

SUMMARY OF THE INVENTION An object of the present invention is to provide a circuit breaker with excellent safety during wiring work by preventing voltage from being applied to the terminals when the terminal cover is open.

[Means for solving problems]

The above object includes: a terminal cover provided on the circuit breaker so as to cover each of the power supply side terminal and the load terminal; and a terminal cover mounting portion provided on the casing to allow the terminal cover to be inserted.
An open detecting means for detecting that the terminal cover is opened, and a trip means for tripping the opening/closing mechanism when the open detecting means detects that the terminal cover is opened, and the open detecting means is provided at least on the load side terminal side. This is achieved by configuring the movable contact provided on the terminal cover mounting portion of the terminal cover to separate the movable contact provided on the power source side from the terminal when the terminal cover is opened.

[Effect]

The terminal cover covers the power supply side terminal and the load side terminal, respectively, and prevents hands from touching the terminals.

The terminal cover mounting portion holds the terminal cover on the housing.

The open detecting means is provided in the terminal cover mounting part and detects the opening of the terminal cover 1, and operates the tripping mechanism or the overcurrent detecting means via the trip means to trip the opening/closing mechanism. When the terminal cover of the load side terminal is opened, the opening/closing mechanism of the circuit breaker is tripped, the movable contact is separated, and voltage is prevented from being applied to the load side terminal. This makes it possible to prevent voltage application to terminal l due to erroneous operation during wiring work.

〔Example〕

Embodiments of the present invention will be explained with reference to FIGS. 1 to 19.

A first embodiment of the present invention will be described with reference to FIGS. 11 to 5.

FIG. 1 shows the overall configuration of the circuit breaker of this embodiment, which includes a power supply terminal 1 and a fixed contact 2o as power supply side terminals, and = 3 - movable contact block 2 as a movable contact for opening and closing the electric circuit. , an opening/closing mechanism 6 consisting of a link M@3, a handle 4, and a lever 5 for simultaneously opening and closing various movable contact blocks 2, and a movable core 7 as an overcurrent detection means for tripping due to overcurrent, etc. , a relay shaft 8 as a tripping mechanism for tripping the opening/closing mechanism 6, and a load terminal 9 connected to a movable contact block via a coil that excites the movable core, and furthermore, a person comes into contact with the exposed terminal. prevent this from happening.

It has a terminal cover 10. In this embodiment, a lever 12 is provided as an open detecting means, and the lever 12 is biased in the direction of pressing the movable core 7 by a spring 22, and this lever 12 is attached to the case of the circuit breaker as shown in FIGS. 4 and 5. 9, which is rotatably held in the interphase insulating part 30a that serves as the terminal cover attachment part of 30;
Further, a terminal cover detection portion 12b protrudes into the mounting hole portion 13 of the terminal cover 10 of the interphase insulating portion 30a. Therefore, as shown by the dashed line in FIG. 5, when the terminal cover 10 is not attached (terminal cover open state), the lever 12 pushes the movable core 7 with the suppressing parts 1 and 2 a provided on the arm 12C. Since it is pressed, 1 circuit breaker = 4 = The breaker is in a trip state, preventing voltage application to the load side terminal and maintaining a state in which it cannot be turned on. Then, when the terminal cover 10 is attached, the terminal cover 10
engagement part]-〇a pushes the terminal cover 12b and lever 1
2 is pushed up, the trip state is released, and the ON operation becomes possible after the reset.

Note that 42 is wiring on the primary side (power supply side).

A second embodiment of the present invention will be described with reference to FIGS. 6 and 7.

In this embodiment, the open detection means is composed of a lever 14 that presses the relay shaft 8 that pulls out the opening/closing mechanism.
b to the right and lever 14 as shown by the solid line in Figure 7.
By holding the relay shaft 8 to the right, the suppression of the relay shaft 8 by the suppression portion 14a is released and the circuit breaker becomes operable.

When the terminal cover 10 is removed and opened, the engaging portion 10a
is disengaged from the detection portion 14b, and the lever 14 is moved to the left by the force of the spring 22 to the position shown by the one-dot chain line in FIG. a presses the relay shaft 8 to enter a trip state, the opening/closing mechanism 6 is tripped, the movable contact block 2 is separated from the fixed contact 20, and the application of voltage to the load side terminal 9 is prevented. The third embodiment of the present invention is shown in FIGS. 8 to 1]
This will be explained using figures.

This embodiment is for the case where a circuit breaker or the like is stored and used inside a box, and when the cover 15 of the outer box as a terminal cover is removed, an open state is detected as shown by the dotted chain line in Fig. 11. The button 16 serving as the means is biased by the spring 24 and comes into a protruding state, and presses the movable core 7 via the lever lever 2 to set it in the trip state, and pulls the opening/closing mechanism 6 as in the first embodiment. The detachable movable contact 2 is opened and the one-circuit breaker cannot be closed.

A fourth embodiment of the present invention will be described with reference to FIG.

In this embodiment, the lever 14 that is linked to the movement of the handle 4 or the handle lever 5, which is the opening/closing mechanism of the circuit breaker, engages with the groove 17 of the engaging portion 10a of the terminal cover 10, and the circuit breaker is in the closed state. In this case, the terminal cover cannot be removed.On the other hand, when the first circuit breaker is opened, the lever 14 is biased by the spring 22 and moves in the direction of the arrow to remove the terminal cover 10 and perform wiring work. It is structured so that it can be done. A first modification and a second modification of this embodiment are shown in FIGS. 13 and 14.

All of these modifications are examples in which the terminal cover 10 is locked in conjunction with the rotational movement of the connecting shaft 3 of the opening/closing mechanism.

A fifth embodiment of the present invention will be described with reference to FIG.

In this embodiment, the open detection means is constituted by a lever 26 swingably provided above the movable core 7, and the other configurations are the same as in the first embodiment. In this embodiment, the lever 26 is swingably held in the housing 30 by a pin 28 at a position closer to the load side than the center, and has a suppressing portion 26a at the end facing the movable core 7 and a terminal on the opposite side. Detection section 26
b, and the detection part 26b is urged upward by the spring 34. A pin 32 is slidably provided above the detection part 26b. If the terminal cover 10 is not attached,
The force of the spring 34 causes the pin 32 to protrude onto the surface of the terminal cover mounting portion 30a of the housing 3°, and at this time, the suppressing portion 26a presses the movable core 7 and pushes it down, the opening/closing mechanism 6 is pulled out, and the movable contactor is released.

When the terminal cover 10 is attached, the pin 32 is pushed down,
As a result, the pressing portion 26a of the lever 26 moves upward, and the trip state is released. In FIG. 15, the terminal cover on the power terminal 1 side is not shown.

A sixth embodiment of the present invention will be described with reference to FIGS. 16 and 17.

The first to fifth embodiments all relate to improving the safety of the load-side terminals, but this embodiment relates to improving the safety of the power-supply terminals.

In this embodiment, a mounting hole 13 is provided in the interphase insulation part 30a of the housing 30.
A switch 18 is provided as an open detecting means facing the opening, and an actuator 18a as a detecting section is protruded into the mounting hole 13.

When the cover 10 is attached, the engaging part 10a pushes the actuator 18a and the contact of the switch 18 opens, and the cover 10
When released, the pressure on the actuator 18a by the engaging portion LOa is released and the contact of the switch 18 is closed.

In this embodiment, as shown in FIG. 17, an upper circuit breaker 19 is provided with a voltage tripping device 40 on the upper side of the circuit breaker.
, and the contacts of the switch 18 are connected in series with the excitation coil 40a of the voltage tripping device 40. As a result, when the terminal cover 10 is removed and opened, the voltage tripping circuit 40 operates, tripping the upper circuit breaker 40 provided above the power supply side terminal 1 (on the power supply side) and causing its movable contact to trip. are opened to prevent the application of voltage to the power supply side terminal 1. Note that the circuit breaker of this embodiment is the voltage tripping device 40.
If the device is equipped with a switch 18, a switch 18 may be provided on the load side terminal 9 side.

A seventh embodiment of the present invention will be described with reference to FIGS. 18 and 19. In all of the above embodiments, safety measures were taken when the terminal cover was opened, but in this embodiment, the present invention is applied to a circuit breaker equipped with an interphase barrier 11 as shown in FIGS. 18 and 19. It is.

In this embodiment, the engagement portion 1.1a of the interphase barrier 11 operates the open detection means. The other configurations are the same as in the first embodiment. In addition, in FIGS. 1-8, illustration of the mutual barrier on the power supply side is omitted.

According to the embodiments described above, the safety of the operator can be ensured because the circuit breaker cannot be operated without protective covers such as the terminal cover interphase barrier and the outer box. Furthermore, since wiring work cannot be performed unless the circuit breaker is opened, worker safety can be ensured. Furthermore, even if you make a mistake and attempt to perform wiring work with the circuit closed, the operator may be required to open the circuit breaker by removing the terminal cover, etc., or by opening the second-position circuit breaker, etc. It can prevent accidents such as electric shock to the handler, etc.

〔Effect of the invention〕

According to the present invention, since no voltage is applied to the terminals when the terminal cover is open, it is possible to obtain a circuit breaker with excellent safety during wiring work.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing the configuration of a circuit breaker according to a first embodiment of the present invention, FIG. 2 is a perspective view showing a state in which a terminal cover is attached to the circuit breaker of this embodiment, and FIG. The figure is a perspective view of a terminal cover, Figures 4 and 5 are a plan view and side view showing the main parts of this embodiment, respectively, and Figures 6 and 7 are a circuit breaker according to a second embodiment of the present invention. A plan view and a side sectional view showing the main parts of the circuit breaker, and FIGS. 8 to 10 are views showing the external appearance of a circuit breaker according to a third embodiment of the present invention, and FIG. 8 is a perspective view when it is simply placed in a box. Figure, No. 9
Figures 1-0 are a front view and a side view, respectively, of the case with an operating handle, Figure 11 is a side view showing the configuration of the main parts of this embodiment, and Figure 12 is a fourth embodiment of the present invention. A side sectional view showing the main parts of the circuit breaker in Figure 13, Figure 1.
, 4 are side sectional views showing the main parts of the first modified example and the second modified example of the present embodiment, respectively, and FIG. 15 is the fifth modified example of the present invention.
A side sectional view showing the configuration of a circuit breaker according to an embodiment, the first
- Figure 6 is a side sectional view showing the main parts of a circuit breaker according to the sixth embodiment of the present invention, Figure 17 is a circuit diagram showing electrical connections in this embodiment, and Figure 18 is a seventh embodiment of the present invention. FIG. 19 is a perspective view showing the external appearance of the circuit breaker in this embodiment, and FIG. 19 is a perspective view of the mutual barrier in this embodiment. ]: Power supply side terminal, 2: Movable contact, 6: Opening/closing mechanism, 7:
Overcurrent detection means, 8: Tripping mechanism, 9: Load side terminal, 1
0, 11, 15: Terminal cover 12a, 14-a
, 26 a, 40: l-lip means, 12
b, 1.4b, 26b, 18a: Open detection means, 30
: Housing, 30a: Terminal cover attachment part. ′″> 0
6＼ N 弗 /b Figure Haya 17th

Claims (1)

[Claims] 1. A fixed contact in a housing, a movable contact, a switching mechanism that connects and separates the movable contact from the fixed contact, overcurrent detection means for detecting a load current, the switching mechanism and the overcurrent. a tripping mechanism interposed between the detection means and the overcurrent detection means to transmit the movement of the overcurrent detection means to the opening/closing mechanism and tripping the opening/closing mechanism when an overcurrent is applied; In the circuit breaker, the circuit breaker includes a power supply side terminal connected to the movable contact, and a load side terminal electrically connected to the movable contact via the overcurrent detection means, wherein the power supply side terminal and the load side Among the terminals, a terminal cover provided to cover at least the load-side terminal, a terminal cover mounting portion provided on the housing so that the terminal cover can be inserted, and the terminal cover being opened. an open detection means for detecting the opening of the terminal cover; and a trip means for tripping the opening/closing mechanism when the open detection means detects that the terminal cover is opened; A circuit breaker characterized in that a movable contact provided on the power source side of the terminal is configured to open and separate.