JPH02239535A - Breaker for wiring with earth leakage alarming function - Google Patents

Abstract

PURPOSE:To prevent an internal contact from chattering due to vibration and shocks caused by opening/closing motions by locating an earth leak relay apart from the opening/closing mechanism in a breaker case, putting the relay in a shield case, and installing in the breaker case using a mounting member consisting of magnetic material. CONSTITUTION:An earth leak relay 5, which is installed on a mount table 13 of a sensitivity changeover device 12, separates from an opening/closing mechanism 4, so that no chattering will be generated at an internal contact 501 of the leak relay 5 due to vibration and shocks caused by opening/closing motions. If this leak relay 5 is put in a shield case 19 and mounted on the mount table 13 using a mounting frame 21 and mounting plate 20, the mounting frame 21, mounting plate 20, and shield case 19 consisting of magnetic substance absorb magnetic flux due to large current, so that no voltage will be induced in an internal coil 502 of the leak relay 5, and thereby the internal contact 501 be prevented from chattering.

Description

Detailed Description of the Invention (Industrial Field of Application J) This invention is a molded circuit breaker with an earth leakage alarm function, which has an earth leakage alarm function in addition to the overload/short circuit protection function, which is the basic function of a molded circuit breaker. [Prior Art] As a conventional molded case circuit breaker with an earth leakage alarm function of this type, those shown in Figs. 3 to 7 have been proposed. Fig. 3 is an external perspective view, and Fig. 4 is a perspective view of the circuit breaker. The figure is a schematic front view with the cover removed, Figure 5 is its circuit diagram, Figure 6 is a partial perspective view showing the vicinity of the leakage [no], and Figure 7 is a partial perspective view showing the vicinity of the sensitivity switching device. In the figure, (1) is a molded circuit breaker, and although not shown, it is equipped with overload and short circuit protection functions. (2)
) is the circuit breaker case of the molded circuit breaker (1), and the base (2
a) and a cover (2b) 6 (3) is a manual operation handle provided in the center of the circuit breaker case (2), (4) is an opening/closing mechanism section linked to the manual operation handle (3), (5) is an earth leakage relay (power relay) placed next to the opening/closing mechanism section (4), and is attached to a mounting base (6) on the base (2a) by a board (5a). (7), (
8) is the load side and power supply side terminals located at both ends of the circuit breaker case (2), and (9) is the load side terminal part (7).
The zero-phase current transformer installed on one side, (10) is the earth leakage relay (
5) and the zero-phase current transformer (9), a 4-J amplifier section (
11) is a transformer installed on the other side of the load-side terminal section (7), and (12) is a sensitivity switching device that is attached to the mounting base (l3) on the transformer (11) with a board (14). This is for making switching settings. (15) is an earth leakage display member, and when the earth leakage relay (5) is activated, for example, it lights up in an electric display member (lamp), and projects on the surface of the cover (2b) in a mechanical display member (button). Like that.
]. (16) is a reset button, which is provided for resetting the earth leakage display member (15). (17) is the test button, which is used to check the earth leakage operation in a simulated manner. (tS) is the earth leakage alarm lead wire led out from the circuit breaker case (2). When a leakage occurs in the power distribution line, the zero-phase current transformer (9) detects the leakage current, and this detection signal is amplified by the amplifier (10) to drive the earth leakage relay (5) and issue an alarm. At the same time, the earth leakage display member (15) operates. The alarm is electrically latched inside the circuit, so the reset button (
16) is held until ill-1 1 or the main circuit power is exhausted.

(Problems to be Solved by the Invention) In the conventional molded circuit breaker with earth leakage alarm function as described above, the earth leakage relay (5) is placed close to the opening/closing mechanism (4), so vibrations and shocks due to opening/closing operations may occur. This causes chattering at the internal contacts (501) of the earth leakage relay (5), and since the earth leakage relay (5) is placed on the mounting base (6), when a large current flows, the magnetic flux causes the earth leakage relay (5) to There is also a problem in that chattering occurs at the internal contacts (501) when a voltage is applied to the internal coil (502).

This invention was made to solve this problem, and the internal contacts of the earth leakage relay are separated from the opening/closing mechanism, placed in a shield case, and attached to the circuit breaker case using a mounting member made of magnetic material. The objective is to obtain a power distribution circuit breaker with an earth leakage alarm function that can eliminate chattering. [Means for Solving the Problems] In order to achieve the above object, the molded circuit breaker with an earth leakage alarm function according to the present invention has the following features: The earth leakage relay is placed in a shield case and installed inside the circuit breaker case using a mounting member made of magnetic material. [Function j] In this invention, since the earth leakage relay is separated from the opening/closing mechanism, the internal contacts do not chattering due to vibrations and shocks caused by the opening/closing operation, and the earth leakage relay is placed in a shield case and the circuit breaker is mounted using a mounting member made of magnetic material. Since it is installed inside the case, no voltage is induced in the internal coil by the magnetic flux caused by the large current. [Example] An example of the present invention will be explained with reference to FIGS. 1 and 2. Figure 1 is a partial perspective view showing the vicinity of the sensitivity switching device, Figure 2
The figure is an exploded view of the main parts of FIG. 1, and the same or corresponding parts as the conventional one are given the same reference numerals and their explanation will be omitted.
In the figure, (19) is a shield case made of magnetic material, into which the earth leakage relay (5) is fitted, and (20) is a mounting plate made of magnetic material, which is a mounting base for the sensitivity switching device (12). l3) with screws, etc. (2l) is a mounting frame made of magnetic material, which is fixed to the mounting plate (20). (21a) is a claw provided on the mounting frame (21), which is hooked onto the circuit board (5a) of the earth leakage relay (5).
5) together with the shield case (19) in the mounting frame (2l). If the earth leakage relay (5) is installed on the mounting base (13) of the sensitivity switching device (12) in this way, the earth leakage relay (5) will be separated from the opening/closing mechanism (4), so vibrations and shocks caused by the opening/closing operation will prevent earth leakage. No chattering occurs at the internal contact (501) of the relay (5). Also, put the earth leakage relay (5) in the shield case (19) and attach it to the mounting frame (2L).
) and the mounting plate (20) to the mounting base (13), the shield case (19) made of magnetic material, the mounting frame (21), and the mounting plate (20) will absorb the magnetic flux caused by the large current. Internal coil (502) for leakage leakage (5)
No voltage is induced in the terminal, and no chattering occurs at the internal contact (501) of (5), causing electrical leakage.

[Effects of the Invention] As described above, according to the present invention, the earth leakage relay is separated from the opening/closing mechanism, is placed in a shield case, and is attached to the circuit breaker case using a mounting member made of a magnetic material, so that vibrations and shocks caused by the opening/closing operation are prevented. No chattering occurs at the internal contacts of the earth leakage relay, and no voltage is induced in the internal coil of the earth leakage relay due to the magnetic flux caused by the large current, so there is an effect that no chattering occurs at the internal contacts.

[Brief explanation of drawings]

Fig. 1 is a perspective view of essential parts showing an embodiment of the present invention, Fig. 2 is a partially exploded view of Fig. 1, Fig. 3 is an external perspective view showing the conventional one, and Fig. 4 is with the cover removed. 5 is a schematic front view, FIG. 5 is a circuit diagram thereof, FIG. 6 is a partial perspective view showing the vicinity of the leakage switch/1, and FIG. 7 is a partial perspective view showing the vicinity of the sensitivity switching device. In the figure, (1) is a molded circuit breaker, (2) is a circuit breaker case, (4) is an opening/closing rock structure, (5) is an earth leakage relay, (9) is a zero-layer current transformer, and (19) is a shield. Case,(
20) and (21.) indicate mounting members. Note that the same reference numerals in the figures indicate the same or corresponding parts. Agent Patent Attorney Masuo Oiwa〕- Figure Figure 9l Zero Paper Purisa Diagram ÷ Isshu 1111

Claims (1)

[Claims] (1) A zero-phase current transformer and an earth leakage relay are built into the circuit breaker case of the molded circuit breaker, and in addition to the overload and short circuit protection function, which is the basic function of the molded circuit breaker, it also has an earth leakage alarm function. In the molded circuit breaker with an alarm function, the earth leakage relay is arranged in a position away from the opening/closing mechanism part in the circuit breaker case, and the earth leakage relay is placed in a shielding case and the circuit breaker is attached to the circuit breaker by a mounting member made of a magnetic material. A molded circuit breaker with an earth leakage alarm function that is installed inside the case.