JPH0110845Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to earth leakage and disconnection, and relates to improvements in sensitivity selection switches and the like.

To detect leakage or disconnection, a zero-phase current transformer detects the leakage current in the load power line, this secondary output is amplified by the detection circuit, and a tripping mechanism is activated by the trip coil to quickly disconnect the circuit. It is a type of wiring disconnector. This earth leakage and disconnection switch may be provided with a sensitivity changeover switch that adjusts the secondary output of the zero-phase current transformer by resistive voltage division to enable switching of the earth leakage current, so-called sensitivity current. Conventionally, sensitivity selector switches for earth leakage and disconnection have been installed in the earth leakage and disconnection case (hereinafter referred to as the main body case) or the cover (hereinafter referred to as the main body cover) with a hole for the sensitivity changeover switch provided on the surface of the main body cover. It is placed and fixed using a mounting bracket for easier operation, and the lead wire from the sensitivity selector switch is routed through a groove or space provided in the main body case or main body cover, and the detection circuit storage case (hereinafter referred to as the storage case) is installed. It is connected to the detection circuit part fixed in the resin mold. In this case, the sensitivity selector switch and the detection circuit are installed separately and apart, and the lead wires between them are separated by the length of the distance between them, and each is assembled separately on the main body case or main body cover. Because the lead wire is long, it is susceptible to noise from external magnetic fields or radio wave interference.
There were problems with electrical leakage and disconnection malfunctions.
Also, when assembling the main body case and main body cover, due to the long lead wires that connect this sensitivity selection switch and the detection circuit section, the main lead wires that are wired in the grooves or spaces provided in the main body case or main body cover may be damaged. This has the disadvantage that the lead wires may get caught in the fitting or contact area between the main body case and the main body cover, resulting in damage to the lead wires. Furthermore, the sensitivity selector switch and the detection circuit section are separated and fixed to the main body case or main body cover,
Because they were connected by lead wires, there was a problem that work efficiency during assembly was low, such as when handling lead wires.

The purpose of this invention was made in view of the above circumstances.The arrangement of the detection circuit and sensitivity switch reduces malfunctions caused by noise, prevents damage to the lead wires, and improves work efficiency during assembly. It is about providing the equipment.

An embodiment of the present invention shown in the drawings will be described below. FIG. 1 is a perspective view of main parts such as a detection circuit, and a detection circuit section 2 is housed in a storage case 1 made of an insulating material and fixed together with a resin mold. The sensitivity changeover switch 3 is inserted into a mounting hole provided in a part of the side wall of the storage case 1, and is fixed by being clamped with a nut, and the knob 4 projects out of the storage case. The detection circuit section 2 and the sensitivity changeover switch 3 are wired by extremely short lead wires 5. At this time, it is also possible to directly connect the terminals of the sensitivity changeover switch 3 to the printed circuit board (not shown) of the detection circuit section 2. FIG. 2 is a partially cutaway perspective view of the earth leakage and disconnection switch, in which the storage case 1, the detection circuit section 2, and the sensitivity selector switch 3 are assembled and fixed in the main body case 5 in an integrated state. At this time, the knob 4 of the sensitivity changeover switch 3 is arranged so as to be located in the hole 7a provided in the main body cover 7 of the earth leakage switch.

According to the above configuration, since the sensitivity changeover switch 3 is directly fixed to the storage case 1 that houses the detection circuit part 2 for detecting leakage or disconnection, the lead wire 5 connecting the sensitivity changeover switch 3 and the detection circuit part 2 is connected. It can be made extremely short and is less susceptible to noise caused by external magnetic fields or radio wave interference, thereby preventing electrical leakage and malfunction of the disconnector. In addition, the detection circuit section 2, the sensitivity selector switch 3, and the lead wire 5 are integrated in advance, and the lead wire 5 is independent of the main body case 6 and the main body cover 7, and the lead wire 5 is connected to the fitting part between the main body case 6 and the main body cover 7. Or, it will not get caught in the contact part,
The lead wires will not be damaged. Furthermore, the detection circuit section 2 and the sensitivity selector switch 3 are integrated in advance,
Since it is unitized, it can be easily incorporated into the mass production process, improving work efficiency during assembly, which in turn improves reliability. Naturally, the knob 4 of the sensitivity changeover switch 3 can be operated from the hole 7a provided in the main body cover 7.

According to the present invention, the storage case, the detection circuit,
Since the sensitivity switch and lead wire are integrated, it reduces malfunctions due to external noise that the lead wire receives, prevents damage due to lead wire getting caught, and improves the efficiency of electrical leakage and disconnector assembly work, which in turn improves reliability. There is.

[Brief explanation of the drawing]

Figure 1 is a perspective view of the main unit of this invention, Figure 2 is a perspective view of the main unit of the present invention.
The figure is a partially cutaway perspective view of the current leakage and disconnection switch of the present invention. 1... Storage case, 2... Detection circuit section, 3...
Sensitivity selector switch, 4...knob, 5...lead wire, 6...earth leakage and disconnection case (main case),
7...Earth leakage and disconnection cover (body cover), 7a
……hole.

Claims (1)

[Scope of utility model registration request] A zero-phase current transformer that detects leakage current in the load power line, a detection circuit that amplifies the secondary output of this zero-phase current transformer, and the output of this detection circuit operates via a trip coil to interrupt the circuit. and a sensitivity switching switch that adjusts the secondary output of the zero-phase current transformer by resistive voltage division to switch the detection sensitivity of the leakage current, the detection circuit section is insulated. It is stored in a storage case made of material and fixed with a resin mold, and one side of the storage case is extended to fix a sensitivity changeover switch, and the tip of the sensitivity changeover switch is made to protrude from the extension part of the storage case. Electrical leakage and disconnection characterized by: