Power-off device for preventing electrical accidents and mechanical damages caused by false switching-on power transmission

Abstract

The utility model belongs to the technical field of electric leakage protection, and particularly relates to a power-off device for preventing electrical accidents and mechanical damages caused by false switching-on power transmission, which comprises a distribution box power supply, a power-off resending tripping trigger, an electric leakage protection switch and a test button, the power-off retransmitting tripping trigger and the electric leakage protection switch are both electrically connected to the distribution box power supply, the power-off retransmitting tripping trigger is electrically connected with the electric leakage protection switch, and the test button is electrically connected with the power-off retransmitting tripping trigger. According to the utility model, the zero sequence action principle of the leakage protector is utilized, and the power-off resending tripping action is completed through an external line under the condition that the triggering device is maintained in the original state. The neon bulb and the polar capacitor are connected in series, so that the neon bulb emits light in the charging process, emits light during charging and does not emit light after being fully charged. Photoelectric coupling is realized by using a neon bulb and a photoresistor, so that strong and weak current isolation is realized.

Description

Technical Field

[0001] The utility model belongs to the technical field of leakage protection, and particularly relates to a power-off device for preventing electrical accidents and mechanical injuries caused by misclosing and power-on. Background Technique

[0002] When some electrical equipment in use on the power supply line encounters a sudden power outage, for electrical equipment controlled by mechanical switches, if the power switch is not turned off in time, when the power supply resumes, the previously unturned-off electrical equipment will still be in the working state, such as lamps, rice cookers, electric griddles, electric irons, electrically heated oil lamps, infrared heating heaters, some tea boilers heated by electric heating wires, etc. If there are people at home, the switch can be turned off in time, but if people leave the room in this situation, then these electrical equipment with heating functions and mechanical movement functions are very likely to cause fires or other accidents when there is no one at home.

[0003] For small grinding wheel cutters, electrically heated waterproof asphalt furnaces, small machinery controlled by circuit breakers such as rammers, electric drills, grinding wheel cutters, charging equipment, etc. used at the construction site, when suddenly power off or trip during use (due to non-standard power use at the construction site, leakage trips and cable breaks often occur), if the power can be cut off in time after the power outage, it's okay, but if the power is not cut off, these mechanical devices will run by themselves when the power is restored again, and it is very likely to cause mechanical injury accidents. There has been an accident: after the power outage of the line, the worker entered the concrete mixer drum to clean the internal concrete. Since the power-off equipment did not run, the worker forgot to pull the switch to cut off the power. When the line resumed power, the mixer suddenly started and caused death. Therefore, in Article 8.2.8 of the "Technical Specification for Temporary Electrical Use at Construction Sites", it is stipulated that for small equipment with frequent starts, a button box controlled by a contactor should be used. However, the actual situation is that most projects do not implement according to the specification, mainly because the installation and production cost is high, so it is difficult to promote.

[0004] When electricians are dealing with faults and repairs, they will disconnect the upper-level switch and hang a warning sign that prohibits closing the switch during maintenance. However, the actual situation is that there are often cases where the sign is not hung. If someone closes the switch rashly, it is very likely to cause electric shock accidents, and there are many such accident cases. Content of the Utility Model

[0005] In view of the above technical problems, the utility model provides a power-off device for preventing electrical accidents and mechanical injuries caused by misclosing and power-on, which effectively and inexpensively reduces the occurrence of accidents.

[0006] In order to solve the above technical problems, the technical solution adopted by the utility model is as follows:

[0007] A power-off device for preventing electrical accidents and mechanical injuries caused by mistaken power supply due to closing the switch, comprising a distribution box power supply, a power-off and re-powering tripping trigger, a leakage protection switch and a test button, wherein the power-off and re-powering tripping trigger and the leakage protection switch are both electrically connected to the distribution box power supply, the power-off and re-powering tripping trigger is electrically connected to the leakage protection switch, and the test button is electrically connected to the power-off and re-powering tripping trigger.

[0008] The power-off re-transmission trip trigger includes a first indicator light, a second indicator light, a switching power supply, a light-controlled switch, a relay, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a photocoupler, a diode and a polarity capacitor. The first indicator light is connected in parallel between the phase line and the neutral line of the power supply of the distribution box, the switching power supply is connected in parallel with the first indicator light, the light-controlled switch is electrically connected to the switching power supply, and the light-controlled switch is electrically connected to the relay.

[0009] The relay is electrically connected to the first resistor and the fourth resistor respectively, the first resistor is electrically connected to the second indicator light and the leakage protection switch respectively, the second indicator light is electrically connected to the leakage protection switch, the fourth resistor is electrically connected to the relay through the polarity capacitor, and the fourth resistor is electrically connected to the neutral line of the distribution box power supply.

[0010] The light-controlled switch is electrically connected to a photoelectric coupler, the second resistor and the third resistor are connected in parallel at both ends of the first indicator light, the second resistor is connected in series with the third resistor, the second resistor is electrically connected to the photoelectric coupler and the fifth resistor respectively through a diode, the photoelectric coupler and the fifth resistor are both electrically connected to one end of a test button, one end of the test button is electrically connected to a relay, and the other end of the test button is electrically connected to the fourth resistor.

[0011] The relay includes a first pin, a second pin, a third pin, a fourth pin, a fifth pin, a sixth pin, a seventh pin, an eighth pin, a relay coil, a first contact and a second contact. The relay coil is electrically connected between the first pin and the eighth pin, the third pin is electrically connected to the first contact, the first contact, the second pin and the fourth pin constitute a single-pole double-throw switch, and the first contact is normally closed at the second pin; the sixth pin is electrically connected to the second contact, the second contact, the fifth pin and the seventh pin constitute a single-pole double-throw switch, and the second contact is normally closed at the seventh pin.

[0012] The first pin and the eighth pin of the relay are electrically connected to the light control switch. The second pin of the relay is electrically connected to the phase line of the distribution box power supply. The third pin of the relay is electrically connected to the first resistor. The fourth pin of the relay is open. The fifth pin of the relay is electrically connected to the fourth resistor. The sixth pin of the relay is electrically connected to the polar capacitor. The seventh pin of the relay is electrically connected to the test button.

[0013] The optocoupler includes a neon bulb and a photosensitive resistor. The photosensitive resistor is electrically connected to the light control switch. The neon bulb is electrically connected between the diode and the test button.

[0014] The leakage protection switch includes a drivable knife switch, a circuit breaker, an electromagnet coil, phase lines, and a neutral line. There are three phase lines, and the three phase lines are respectively electrically connected to the three phase lines of the distribution box power supply. Each of the three phase lines is electrically connected to a drivable knife switch. The neutral line is electrically connected to the neutral line of the distribution box power supply. Each of the three phase lines is electrically connected to a circuit breaker. The phase lines and the neutral line are both arranged inside the electromagnet coil. The electromagnet coil is electrically connected to the circuit breaker.

[0015] The phase line is electrically connected to the second indicator light, and the neutral line is electrically connected to the first resistor.

[0016] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0017] The present utility model utilizes the zero-sequence action principle of the leakage protector. While maintaining the original state of the triggering device, the power-off and retransmission tripping action is completed through an external circuit. The present utility model realizes the charging process by connecting the neon bulb in series with the polar capacitor, and the neon bulb emits light during charging and does not emit light when fully charged. By utilizing the characteristic that the current required for the neon bulb to emit light is very small, the time for the capacitor to be fully charged is extended, avoiding the situation where the action time of the relay is less than 0.1S of the leakage protector when the power comes back. The optoelectronic coupling is realized by using the neon bulb and the photosensitive resistor, thereby realizing the isolation between the strong electricity and the weak electricity. Description of the Drawings

[0018] In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only exemplary, and for those of ordinary skill in the art, without creative efforts, other implementation drawings can also be obtained based on the provided drawings.

[0019] The structures, proportions, sizes, etc. shown in this specification are only used to match the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the implementation conditions of the present utility model. Therefore, they do not have substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size, without affecting the efficacy that the present utility model can produce and the purpose that can be achieved, should still fall within the scope covered by the technical content disclosed in the present utility model.

[0020] Figure 1 is the circuit diagram of the present utility model;

[0021] Figure 2 is the pin schematic diagram of the relay of the present utility model;

[0022] Figure 3 is the circuit path diagram of the trigger circuit after the power is restored in the present utility model;

[0023] Figure 4 is the schematic diagram of the circuit flow during the charging process of the present utility model;

[0024] Figure 5 is the schematic diagram of the relay being powered on and working and the capacitor discharging in the present utility model;

[0025] Figure 6 is the current path diagram when the test button of the present utility model is pressed;

[0026] Figure 7 is the schematic diagram of the charging and discharging process of the polarized capacitor in the present utility model.

[0027] Among them: 1 is the power supply of the distribution box, 2 is the power-off restoration tripping trigger, 3 is the leakage protection switch, K1 is the test button, HL1 is the first indicator light, HL2 is the second indicator light, AC / DC is the switching power supply, P is the light control switch, J is the relay, R1 is the first resistor, R2 is the second resistor, R3 is the third resistor, R4 is the fourth resistor, R5 is the fifth resistor, OC is the optocoupler, D is the diode, C is the polarized capacitor, K2 is the driveable knife switch, QF is the circuit breaker, LC is the electromagnet coil, L is the phase wire, and N is the neutral wire. Specific embodiments

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. These descriptions are only to further illustrate the features and advantages of the present utility model, rather than a limitation on the claims of the present utility model; based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present application.

[0029] The specific implementation manners of the present utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following embodiments are used to illustrate the present utility model, but are not used to limit the scope of the present utility model.

[0030] The terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise specified, the meaning of "a plurality" is two or more.

[0031] In the description of the present application, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0032] A power-off device for preventing electrical accidents and mechanical injuries caused by misclosing and energizing, as Figure 1 shown, includes a distribution box power supply 1, a power-off and reclosing tripping trigger 2, a leakage protection switch 3, and a test button K1. The power-off and reclosing tripping trigger 2 and the leakage protection switch 3 are both electrically connected to the distribution box power supply 1. The power-off and reclosing tripping trigger 2 is electrically connected to the leakage protection switch 3, and the test button K1 is electrically connected to the power-off and reclosing tripping trigger 2.

[0033] Further, the power-off restoration trip trigger 2 includes a first indicator light HL1, a second indicator light HL2, a switching power supply AC / DC, a light control switch P, a relay J, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, an optocoupler OC, a diode D, and a polar capacitor C. The first indicator light HL1 is connected in parallel between the phase wire and the neutral wire of the distribution box power supply 1. The switching power supply AC / DC is connected in parallel with the first indicator light HL1. The light control switch P is electrically connected to the switching power supply AC / DC and is also electrically connected to the relay J. The relay J is electrically connected to the first resistor R1 and the fourth resistor R4 respectively. The first resistor R1 is electrically connected to the second indicator light HL2 and the leakage protection switch 3 respectively. The second indicator light HL2 is electrically connected to the leakage protection switch 3. The fourth resistor R4 is electrically connected to the relay J through the polar capacitor C and is also electrically connected to the neutral wire of the distribution box power supply 1. The light control switch P is electrically connected to the optocoupler OC. The second resistor R2 and the third resistor R3 are connected in parallel across the two ends of the first indicator light HL1. The second resistor R2 and the third resistor R3 are connected in series. The second resistor R2 is electrically connected to the optocoupler OC and the fifth resistor R5 respectively through the diode D. Both the optocoupler OC and the fifth resistor R5 are electrically connected to one end of the test button K1. One end of the test button K1 is electrically connected to the relay J, and the other end of the test button K1 is electrically connected to the fourth resistor R4.

[0034] Further, as Figure 2 shown, the relay J includes a first pin, a second pin, a third pin, a fourth pin, a fifth pin, a sixth pin, a seventh pin, an eighth pin, a relay coil, a first contact, and a second contact. A relay coil is electrically connected between the first pin and the eighth pin. A first contact is electrically connected to the third pin. The first contact, the second pin, and the fourth pin form a single-pole double-throw switch, and the first contact is normally closed at the second pin. A second contact is electrically connected to the sixth pin. The second contact, the fifth pin, and the seventh pin form a single-pole double-throw switch, and the second contact is normally closed at the seventh pin.

[0035] Further, the first pin and the eighth pin of the relay J are electrically connected to the light control switch P. The second pin of the relay J is electrically connected to the phase wire of the distribution box power supply 1. The third pin of the relay J is electrically connected to the first resistor R1. The fourth pin of the relay J is an open circuit. The fifth pin of the relay J is electrically connected to the fourth resistor R4. The sixth pin of the relay J is electrically connected to the polar capacitor C. The seventh pin of the relay J is electrically connected to the test button K1.

[0036] Further, the optocoupler OC includes a neon bulb and a photoresistor. The photoresistor is electrically connected to the light control switch P, and the neon bulb is electrically connected between the diode D and the test button K1. The function of using the neon bulb is as follows: The current required for the neon bulb to emit light is very small. It can emit light normally when the current is 0.3 mA. Cooperating with the current-limiting resistor prolongs the charging time required, achieving the purpose of extending the charging time with a small capacitor to ensure that the relay operates after the leakage protector 3 trips. The function of setting the fifth resistor R5 is as follows: At the initial stage of charging, the current is large and the neon bulb emits light. The fifth resistor R5 also shunts a part of the current. In the later stage of charging, since the current gradually decreases, the neon bulb will show a phenomenon of bright and dark jumping changes, causing the oscillation of the relay J. At this time, due to the stable shunting of the fifth resistor R5, the neon bulb will no longer emit light.

[0037] Further, the leakage protection switch 3 includes a drivable knife switch K2, a circuit breaker QF, an electromagnet coil LC, a phase line L, and a neutral line N. There are three phase lines L, and the three phase lines L are respectively electrically connected to the three phase lines of the distribution box power supply 1. The three phase lines L are all electrically connected to the drivable knife switch K2. The neutral line N is electrically connected to the neutral line of the distribution box power supply 1. The three phase lines L are all electrically connected to the circuit breaker QF. The phase line L and the neutral line N are both arranged inside the electromagnet coil LC, and the electromagnet coil LC is electrically connected to the circuit breaker QF.

[0038] Further, the phase line L is electrically connected to the second indicator light HL2, and the neutral line N is electrically connected to the first resistor R1.

[0039] The working principle of the present utility model is as follows:

[0040] As Figure 1 shown, in a power-off state, but the leakage protection switch 3 is in a closed state. The second pin and the third pin on the upper side of the relay J are in a conducting state (the first contact is normally closed).

[0041] As Figure 3 shown for the state when power is restored, the phase line current of the distribution box power supply 1 passes through the second pin to the third pin, flows through the third resistor R3, and is connected to the neutral line N at the lower end of the leakage protection switch 3, thus breaking the zero-sequence balance and completing the tripping operation within 0.1 s. The voltage between the second resistor R2 and the third resistor R3 is 220 V / 2 = 110 V. After being rectified by the diode D to form a half-wave rectification and combined with the capacitor to form about 250 V of direct current, it charges the polar capacitor C through the neon lamp, through the seventh pin to the sixth pin of the relay (the second contact is normally closed). During the charging process, the neon bulb of the optocoupler OC remains in a glowing state (since it is direct current, only one pole of the neon bulb emits light). The optocoupler OC is composed of a neon bulb and a photoresistor. The control condition of the light control switch P is that when the photoresistor is illuminated, the switch is not conducting, and when it is not illuminated, it is conducting. That is, when the polar capacitor C is not fully charged, the neon bulb remains in a glowing state until the light intensity becomes weaker and weaker to the full-charge state.

[0042] As Figure 4 shown, when the polar capacitor C is fully charged and the neon bulb does not emit light, the light-controlled switch P conducts, the normally closed contact of the relay J opens after being energized, the upper second pin, third pin and the first resistor R1 are disconnected, and the lower sixth pin and seventh pin disconnect the charging circuit of the neon bulb. However, the fifth pin and the sixth pin conduct to realize the parallel connection of the fourth resistor R4 and the polar capacitor C, completing the process of discharging the polar capacitor C.

[0043] As Figure 5 shown, when the power supply is restored, the leakage protector 3 is in the off state at this time. Therefore, all electrical equipment with mechanical switches in the on state will not work. When there is no problem after inspection or when observing that there is no danger to the electrical equipment after closing the switch, the switch can be closed to supply power. The first indicator light HL1 lights up indicating that the power supply of the line is restored, and when the following second indicator light HL2 does not light up, it means that the switch has not been closed. After closing the switch, the second indicator light HL2 lights up (the meaning of the second indicator light HL2 is: when some large leakage protectors 3 trip, the handle does not point downwards). The second indicator light HL2 lighting up indicates that the switch is closed successfully.

[0044] As Figure 6 shown, if there is a power outage again, the relay J loses power and the first contact and the second contact return to the normally closed state. The upper first resistor R1 is in the conducting state, and the polar capacitor C is also in the state of no charge, making preparations for triggering the trip and power-off when the power comes again. When the power is on and the leakage protector is in the closed state, pressing the test button K1, the leakage protector 3 should trip.

[0045] At present, the use of leakage protectors is very common. The utility model makes full use of effective resources in families, industrial and mining enterprises, hospitals, schools and construction sites, making it more convenient to promote and use. It has a low failure rate. The optoelectronic coupler OC realizes the isolation of strong and weak electricity. By using the characteristic that the current required for the neon bulb to emit light is very small, the time for fully charging the capacitor is extended, avoiding the situation that the action time of the relay when the power comes is less than 0.1S of the leakage protector. Using the working principle of zero sequence and connecting it externally, only by adjusting the resistance value of the first resistor R1 can it be matched with different models (current ampere values) of leakage protectors 3, without changing other components, so it has strong adaptability. Generally, the operating currents of leakage protectors 3 are in specifications such as 15, 30, 75, 150, 250MA, etc. Only by replacing the resistance value of the first resistor R1 can it be matched with the leakage protector 3.

[0046] Installation location: It can be installed beside the leakage protector 3 on the required circuit (except for equipment automatically controlled by programs such as refrigerators and automatic water supply and drainage devices). At the construction site, it can be installed in the second- and third-level distribution boxes. Especially for small equipment and tools that are frequently started (mechanical switches are used to achieve power on / off and forward / reverse rotation), it can prevent mechanical misoperation and electric shock accidents caused by sudden power-on when the switch is not timely returned to the zero position after power failure. The installation form is the C45-type track installation method.

[0047] Parameters of general leakage protection switches: The operating current of the leakage protection switch used at the end of household and small equipment is 30 mA, the operating time is ≤0.1 s, and the resistance of the test circuit in the leakage protector is 5.1 KΩ. Resistance and capacitor charging time: When the resistance is 330 KΩ and a 1 μF capacitor is charged to 0.632 times, the charging coefficient is: 330 kΩ × 1 μF == 0.33 S, and the charging constant is obtained as 0.33. As Figure 7 shown is the charging curve of the polar capacitor C. It is considered fully charged after the time reaches 5 times the charging time constant. From Figure 7 it can be seen that the full charge time is approximately 0.33 × 5 = 1.65 S, and the neon bulb lighting time only needs to be greater than 0.1 s to meet the requirement that the relay J operates after the trip first. According to the provisions of the national standard GB8218 "Low-voltage electrical measuring instruments", the voltage of the neon bulb of the test pen is not less than 50 V but not higher than 90 V, and the operating current of the neon bulb is not greater than 0.4 mA.

[0048] Only the preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art, various changes can be made without departing from the purpose of the present invention, and all such changes should be included within the protection scope of the present invention.

Claims

1. A power-off device for preventing electrical accidents and mechanical damage caused by mistakenly closing the switch, characterized in that: It includes a distribution box power supply (1), a power failure restoration and tripping trigger (2), a leakage protection switch (3), and a test button (K1). The power failure restoration and tripping trigger (2) and the leakage protection switch (3) are both electrically connected to the distribution box power supply (1). The power failure restoration and tripping trigger (2) is electrically connected to the leakage protection switch (3), and the test button (K1) is electrically connected to the power failure restoration and tripping trigger (2).

2. The power-off device for preventing electrical accidents and mechanical injuries caused by misclosing and energizing as claimed in claim 1, wherein: The power failure restoration and tripping trigger (2) includes a first indicator light (HL1), a second indicator light (HL2), a switching power supply (AC / DC), a light control switch (P), a relay (J), a first resistor (R1), a second resistor (R2), a third resistor (R3), a fourth resistor (R4), a fifth resistor (R5), an optocoupler (OC), a diode (D), and a polarized capacitor (C). The first indicator light (HL1) is connected in parallel between the phase wire and the neutral wire of the distribution box power supply (1). The switching power supply (AC / DC) is connected in parallel with the first indicator light (HL1). The light control switch (P) is electrically connected to the switching power supply (AC / DC), and the light control switch (P) is electrically connected to the relay (J).

3. The power-off device for preventing electrical accidents and mechanical injuries caused by misclosing and energizing as claimed in claim 2, wherein: The relay (J) is electrically connected to the first resistor (R1) and the fourth resistor (R4) respectively. The first resistor (R1) is electrically connected to the second indicator light (HL2) and the leakage protection switch (3) respectively. The second indicator light (HL2) is electrically connected to the leakage protection switch (3). The fourth resistor (R4) is electrically connected to the relay (J) through the polarized capacitor (C), and the fourth resistor (R4) is electrically connected to the neutral wire of the distribution box power supply (1).

4. A power-off device for preventing electrical accidents and mechanical damages caused by mistaken closing of the switch according to claim 3, characterized in that: The light control switch (P) is electrically connected to an optocoupler (OC). The second resistor (R2) and the third resistor (R3) are connected in parallel across the two ends of the first indicator light (HL1). The second resistor (R2) and the third resistor (R3) are connected in series. The second resistor (R2) is electrically connected to the optocoupler (OC) and the fifth resistor (R5) respectively through the diode (D). Both the optocoupler (OC) and the fifth resistor (R5) are electrically connected to one end of the test button (K1). One end of the test button (K1) is electrically connected to the relay (J), and the other end of the test button (K1) is electrically connected to the fourth resistor (R4).

5. A power-off device for preventing electrical accidents and mechanical damages caused by erroneous closing of the switch according to claim 3, characterized in that: The relay (J) includes a first pin, a second pin, a third pin, a fourth pin, a fifth pin, a sixth pin, a seventh pin, an eighth pin, a relay coil, a first contact, and a second contact. A relay coil is electrically connected between the first pin and the eighth pin. A first contact is electrically connected to the third pin. The first contact, the second pin, and the fourth pin form a single-pole double-throw switch, and the first contact is normally closed at the second pin. A second contact is electrically connected to the sixth pin. The second contact, the fifth pin, and the seventh pin form a single-pole double-throw switch, and the second contact is normally closed at the seventh pin.

6. The power-off device for preventing electrical accidents and mechanical injuries caused by misclosing and energizing as claimed in claim 5, wherein: The first pin and the eighth pin of the relay (J) are electrically connected to the light control switch (P). The second pin of the relay (J) is electrically connected to the phase wire of the distribution box power supply (1). The third pin of the relay (J) is electrically connected to the first resistor (R1). The fourth pin of the relay (J) is open. The fifth pin of the relay (J) is electrically connected to the fourth resistor (R4). The sixth pin of the relay (J) is electrically connected to the polar capacitor (C). The seventh pin of the relay (J) is electrically connected to the test button (K1).

7. The power-off device for preventing electrical accidents and mechanical injuries caused by misclosing and energizing as claimed in claim 2, wherein: The optocoupler (OC) includes a neon bulb and a photoresistor. The photoresistor is electrically connected to the light control switch (P). The neon bulb is electrically connected between the diode (D) and the test button (K1).

8. A power-off device for preventing electrical accidents and mechanical damages caused by mistaken closing of the switch according to claim 1, characterized in that: The leakage protection switch (3) includes a drivable knife switch (K2), a circuit breaker (QF), an electromagnet coil (LC), a phase wire (L), and a neutral wire (N). There are three phase wires (L). The three phase wires (L) are respectively electrically connected to the three phase wires of the distribution box power supply (1). Each of the three phase wires (L) is electrically connected to a drivable knife switch (K2). The neutral wire (N) is electrically connected to the neutral wire of the distribution box power supply (1). Each of the three phase wires (L) is electrically connected to a circuit breaker (QF). The phase wire (L) and the neutral wire (N) are both arranged inside the electromagnet coil (LC). The electromagnet coil (LC) is electrically connected to the circuit breaker (QF).

9. The power-off device for preventing electrical accidents and mechanical injuries caused by misclosing and power-on is as claimed in claim 8, wherein: The phase wire (L) is electrically connected to the second indicator light (HL2). The neutral wire (N) is electrically connected to the first resistor (R1).

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