JPH08279329A - Terminal cover with display lamp for circuit breaker - Google Patents

Abstract

PURPOSE: To prevent the occurrence of danger that a terminal cover is carelessly removed during charging. CONSTITUTION: A display lamp 8, which is lighted when a terminal 15 is charged, and a printed board 11 loaded with a lighting circuit for the display lamp 8 are fitted to the top surface of a terminal cover 5. The inside of the terminal cover 5 is provided with springs 17, of which one end is connected to a power source terminal part of the lighting circuit through terminal metal fittings 18 and of which the other end is made to pressure-contact with a terminal 15 in the installation condition of the terminal cover 5. With this structure, when the terminal cover 5 is installed in the terminal part of a circuit breaker, the lighting circuit and the terminals 15 are automatically connected to each other by the springs 17, and when the terminals 15 are charged, the display lamp 8 is lighted so as to display the charging.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal cover mounted on a terminal portion of a circuit breaker such as a circuit breaker for wiring or an earth leakage breaker, and more particularly, it has a function of indicating that the terminal is being charged. The present invention relates to a terminal cover with an indicator light.

[0002]

2. Description of the Related Art FIG. 5 is a perspective view showing an example of a three-phase circuit breaker in which a terminal cover is attached to a load side terminal portion. The circuit breaker whose opening / closing part is covered by the molded case 1 has the opening / closing lever 2 protruding to the front (upper side of the drawing), and the power source side to the upper end (right end of the drawing) and lower end (left end of the drawing), respectively. And the load side terminal portion 3 are arranged in the same configuration. The terminal portion 3 is divided into three phases by the barrier 4 which is integrated with the mold case 1, and each phase terminal made of a flat plate conductor (not shown) is arranged so as to be exposed from the mold case 1 in each division. The terminal cover 5 covers the terminal portion 3 so that a hand or the like does not touch the charging portion such as a terminal which is a charging portion and a connection end portion of a wire connected to the terminal.

The terminal cover 5 is integrally formed of an insulating resin in a box shape as shown in the figure in which the upper surface, the left and right side surfaces and the front surface of the terminal portion 3 are surrounded by walls, and is fitted to the end portion of the mold case 1 so that a part thereof overlaps. ing. The upper wall of the terminal cover 5 is formed in a comb-tooth shape at a portion extending over the barrier 4 of the molded case 1, and an electric detection hole 6 for inserting an electric detection rod into this portion is located right above a terminal screw (not shown). Is opened. Further, a U-shaped notch 7 through which a wiring connected to the terminal is passed is provided on the front wall of the terminal cover 5, and a barrier 5a is provided between the phases. A protrusion (not shown) is formed on the end surface of the barrier 5a on the side of the circuit breaker, and the terminal cover 5 mounted on the terminal portion 3 from above in the drawing has a groove 4a in which the protrusion is provided on the barrier 4. It is inserted and fixed.

[0004]

In the electrical equipment having the circuit breaker with the terminal cover as shown above, the maintenance worker removes the terminal cover at the time of periodic inspection and the like, and the terminal screw of the circuit breaker is removed. Re-tightening and checking for discoloration of terminals may be performed. In such a case, the work is started after confirming that the terminals are not charged with a test stick or a tester.However, carelessness and assumptions lead to work in a charged state, which may lead to an unexpected electric shock or short circuit. There is also the possibility of encountering an accident. SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a terminal cover with an indicator light of a circuit breaker that can prevent the occurrence of the above-described accident by making it possible to know the charged state of the circuit breaker at a glance. Is.

[0005]

In order to achieve the above object, the terminal cover of the present invention includes an indicator lamp which is lit when the terminal is charged, a lighting circuit which illuminates the indicator lamp, and the lighting circuit. One end is connected to the power supply terminal part of the circuit, and the other end is provided with a conductive spring facing the terminal, and the other end of the spring is press-contacted to the terminal in a state of being mounted on the terminal part of the circuit breaker. It shall be.

The terminal cover has a series circuit including an indicator lamp and a resistor for each phase of the three-phase circuit breaker. One end side of these series circuits is connected to each other in a star shape and the other end side is connected to each other. If they are respectively connected to springs facing the respective phase terminals of the circuit breaker, it is possible to distinguish whether the system in which the circuit breaker is inserted is an AA circuit or a three-phase circuit from the lighting mode of the indicator lamp.

[0007]

[Operation] Since the indicator lamp lights up when the terminal is being charged, it can be seen at a glance whether or not the terminal is being charged. Moreover, since the connection between the lighting circuit and the terminal is automatically performed by the pressure contact of the spring by mounting the terminal cover, there is no risk of secondary disaster due to forgetting to connect the power supply of the lighting circuit. In addition, the lighting circuit of the three-phase circuit breaker was connected to one end of each phase series circuit consisting of an indicator lamp and a resistor, and the other end was connected to a spring facing each phase terminal of the circuit breaker. By making the star shape, two indicator lights are lit in the AA circuit (light circuit) and three indicator lights are lit in the three-phase circuit (power circuit), so these circuits can be distinguished from this lighting mode. .

[0008]

1 to 4 show an embodiment of the present invention. FIG. 1 is a front view of a load side terminal portion of a three-phase circuit breaker with a terminal cover mounted, and FIG. 2 is a circuit breaker. Plan view, FIG.
Is an exploded perspective view of the terminal cover, and FIG. 4 is a wiring diagram of the lighting circuit. First, in FIGS. 1 to 3, the terminal cover 5 is shown in FIG.
In the same configuration as the conventional example, the upper surface of the terminal cover 5 in the figure is an indicator light 8 (8A to 8C) composed of three LEDs,
A printed circuit board 11 on which a lighting circuit including a voltage adjusting resistor 9 and a protective diode 10 is mounted is attached by a screw (not shown), and a box-shaped protective cover 12 made of an insulating resin for protecting the printed circuit board 11 is mounted thereon. ing. The protective cover 12 includes the detection hole 6 of the terminal cover 5 and the printed board 1.
Three holes 13 and 14 are formed in accordance with the indicator lamp 8 on the terminal 1. The protective cover 12 is locked to the terminal cover 5 via a claw (not shown).

On the other hand, inside the terminal cover 5, a conductive coil spring 17 made of, for example, phosphor bronze, which connects the terminal 15 of the circuit breaker and the power supply terminal portion of the lighting circuit, as shown in FIG. It is provided for each phase. One end (upper end in FIG. 1) of the spring 17 is fitted to and electrically connected to the terminal fitting 18, and the other end (lower end in FIG. 1) is the terminal of the terminal 15 when the terminal cover 5 is attached as illustrated. It surrounds the screw 16 and is in pressure contact with the terminal 15. Terminal fitting 1
Reference numeral 8 denotes a stepped rod composed of a cylindrical head portion and a linear shaft portion, two right and left are provided for each phase, and a spring 17 is elastically fitted over the left and right two heads. ing. As shown in FIG. 3, a shaft portion of the terminal fitting 18 is inserted into the terminal cover 5 on both sides of the detection hole 6, and an upper end of the terminal fitting 18 is bent into an L shape and soldered to the printed board 11.

Next, in the connection diagram of FIG. 4, an indicator lamp 8 (8) for each phase of R, S and T in which a protection diode 10 is connected in parallel is provided.
A to 8C) and the resistor 9 are connected in series, and one ends of these series circuits are connected to each other in a star shape at a point D. The other ends of these series circuits are connected to the springs 17 facing the respective phase terminals via terminal fittings 18, respectively. Here, the elements 8, 9, 10 of each phase have the same characteristics. In such a lighting circuit, the indicator lamp 8 is lit when the terminal 15 is charged, but the indicator lamps 8A to 8A are used when the power source is a three-phase three-wire type.
In the case of the single-phase three-wire system, the indicator lights 8A and 8C are illuminated, but the indicator light 8B on the neutral line is not illuminated, while C is all illuminated.

[0011]

As described above, according to the present invention, since the indicator lamp is turned on when the terminal is being charged, it is not necessary to inadvertently remove the terminal cover during charging to start working. Further, since the spring is pressed against the terminal when the terminal cover is attached and the terminal and the lighting circuit are automatically connected, there is no risk of forgetting to connect the power supply when the terminal cover is attached and causing a secondary disaster. Furthermore, by making the lighting circuit of the three-phase circuit breaker star-shaped, it is possible to easily distinguish whether the power supply system is a single-phase three-wire system or a three-phase three-wire system from the lighting mode of the indicator light.
The efficiency of maintenance work is improved.

[Brief description of drawings]

FIG. 1 is a front view of a load-side terminal portion of a circuit breaker showing an embodiment of the present invention.

2 is a plan view of the circuit breaker of FIG. 1. FIG.

FIG. 3 is an exploded perspective view of a terminal cover in the circuit breaker of FIG.

FIG. 4 is a wiring diagram of a lighting circuit of the terminal cover of FIG.

FIG. 5 is a perspective view of a circuit breaker showing a conventional example.

[Explanation of symbols]

 3 terminal part 5 terminal cover 8 indicator light 9 resistance 10 protective diode 11 printed board 12 protective cover 15 terminal 16 terminal screw 17 spring 18 terminal fitting

Claims (2)

[Claims] 1. A terminal cover attached to a terminal portion of a circuit breaker, an indicator lamp which is lit when the terminal is being charged, a lighting circuit which illuminates the indicator lamp, and a power supply terminal section of the lighting circuit. And a conductive spring having one end connected to the other end and the other end facing the terminal, and the other end of the spring comes into pressure contact with the terminal in a state of being attached to a terminal portion of a circuit breaker. Terminal cover with indicator light for circuit breaker. 2. A three-phase circuit breaker has a series circuit including an indicator lamp and a resistor for each phase, one end side of these series circuits is connected to each other in a star shape, and the other end side is a circuit breaker. 2. A terminal cover with an indicator light for a circuit breaker according to claim 1, wherein each of the phase terminals is connected to a spring facing each other.