CN204270904U - A three-phase AC low-voltage arc-free electrical contact device - Google Patents

Abstract

The utility model relates to a kind of three-phase alternating current low pressure without arc electrical contact device, it is characterized in that, comprising: the first to the 6th sets of contacts, the first to the 6th electromagnetic and mechanical actuating mechanism, single-chip computer control system, the first diode and the second diode, a kind of three-phase alternating current low pressure that the utility model proposes is without arc electrical contact device, with three-phase circuit, based on the operation principle of electrical contact and diode, set up AC low-tension electrical contact system, control the job order of three-phase electric apparatus contact, realize three-phase alternating current low-voltage electrical apparatus without arc joint weldment, comprise circuit overloads, disconnected phase, three-phase imbalance, the thick-less vane of overvoltage and under voltage protection, significantly reduce the cost of three-phase alternating current control apparatus, reduce device for switching volume, increase substantially electrical endurance and the reliability of operation of electrical equipment, the device for switching of low-voltage-grade can be utilized to be combined into the device for switching of more voltage levels.

Description

A three-phase AC low-voltage arc-free electrical contact device

technical field

The utility model relates to the field of low-voltage control and protection electrical appliances, in particular to a three-phase AC low-voltage arc-free electrical contact device.

Background technique

The arc-free on-off of traditional low-voltage switching appliances is the key technology of low-voltage electrical appliances. At present, there are two main types of this technology. One is the non-contact electrical appliances that are completely composed of power electronic controllable devices, and the other is the contactless electrical appliances that are composed of contacts and power electronic controllable components. A hybrid electrical appliance composed of devices, these two electrical technologies have been reported in many papers, and there are also products coming out. Due to the complete application of power electronic controllable devices in non-contact electrical appliances, power electronic controllable devices must run for a long time, and the ability of power electronic controllable devices to withstand overvoltage and overcurrent is poor, so the capacity of power electronic controllable devices is large, resulting in The cost of electrical appliances is very high and the technology is complex. The control system of the hybrid electrical appliance is relatively complicated, and there is a problem of electrical isolation, and the cost is relatively high due to the use of power electronic controllable devices. In actual operation, it will be encountered that the voltage level of electrical products cannot meet the requirements of the voltage level of the three-phase power grid, and these problems need to be solved urgently.

Contents of the invention

The purpose of the utility model is to provide a three-phase AC low-voltage arc-free electrical contact device to overcome the defects in the prior art. The utility model has a simple structure and is easy to realize.

In order to achieve the above purpose, the technical solution of the utility model is: a three-phase AC low-voltage arc-free electrical contact device, which is characterized in that it includes: a first contact group, a second contact group, a third contact group, The fourth contact group, the first electromagnetic mechanical action mechanism, the second electromagnetic mechanical action mechanism, the third electromagnetic mechanical action mechanism, the fourth electromagnetic mechanical action mechanism, the single-chip microcomputer control system, the first diode and the second diode;

One end of the first contact group is connected to the first phase of the three-phase power supply, and the other end is connected to one end of the second contact group; the other end of the second contact group is connected to the load; the second contact group is connected to the load; One end of an electromagnetic mechanical action mechanism is connected to the control end of the first contact group, and the other end is connected to the first output end of the single-chip microcomputer control system; one end of the second electromagnetic mechanical action mechanism is connected to the second contact The control terminal of the group is connected, and the other end is connected with the second output terminal of the single-chip microcomputer control system; the first diode is connected in parallel at both ends of the first contact group or the second contact group;

One end of the third contact group is connected to the second phase of the three-phase power supply, and the other end is connected to one end of the fourth contact group; the other end of the fourth contact group is connected to the load; the first One end of the three electromagnetic mechanical action mechanisms is connected to the control end of the third contact group, and the other end is connected to the third output end of the single-chip microcomputer control system; one end of the fourth electromagnetic mechanical action mechanism is connected to the fourth contact The control end of the group is connected, and the other end is connected to the fourth output end of the single-chip microcomputer control system; the second diode is connected in parallel to both ends of the third contact group or the fourth contact group.

In an embodiment of the present invention, it also includes a fifth contact group, a sixth contact group, a fifth electromagnetic mechanical action mechanism, and a sixth electromagnetic mechanical action mechanism; one end of the fifth contact group is connected to the three-phase power supply The third phase is connected, and the other end is connected with one end of the sixth contact group; the other end of the sixth contact group is connected with the load; one end of the fifth electromagnetic mechanical action mechanism is connected with the fifth contact The control end of the group is connected, and the other end is connected with the fifth output end of the single-chip microcomputer control system; one end of the sixth electromagnetic mechanical action mechanism is connected with the control end of the sixth contact group, and the other end is connected with the control end of the single-chip microcomputer. The sixth output of the system is connected.

In an embodiment of the utility model, it also includes a seventh contact group and a seventh electromagnetic mechanical action mechanism; one end of the seventh contact group is connected to the third phase of the three-phase power supply, and the other end is connected to the load; One end of the seven electromagnetic mechanical action mechanism is connected to the control end of the seventh contact group, and the other end is connected to the fifth output end of the single-chip microcomputer control system.

In an embodiment of the present invention, the first contact group, the second contact group, the third contact group, the fourth contact group, the fifth contact group and the The sixth contact group includes N pairs of moving and static contacts, and N is a positive integer greater than or equal to 1.

In an embodiment of the present invention, the first contact group, the second contact group, the third contact group, the fourth contact group, the fifth contact group and the The sixth contact group mentioned above is made of silver-based contact material or copper material.

In an embodiment of the present invention, the first contact group, the second contact group, the third contact group, the fourth contact group and the seventh contact group all include N pairs of moving and static contacts, N is a positive integer greater than or equal to 1.

In an embodiment of the present utility model, the first contact group, the second contact group, the third contact group, the fourth contact group and the seventh contact group are all Silver based contact material or copper.

Compared with the prior art, the utility model has the following beneficial effects: a three-phase AC low-voltage arc-free electrical contact device proposed by the utility model is based on the working principle of a three-phase circuit, an electrical contact and a diode. Establish an AC low-voltage electrical contact system to control the working sequence of three-phase electrical contacts. Using a simple control method, multiple low-cost, small-sized switching appliances and diodes form a three-phase low-voltage switching appliance that is connected and broken without arcing. , such as a variety of relays, including magnetic latching relays, can be used to form a three-phase AC contactor with no power consumption in operation, so as to realize arc-free connection and breaking of three-phase low-voltage electrical appliances, such as circuit overload, phase failure, three-phase unbalance, overvoltage The arc-free breaking of voltage and undervoltage protection greatly reduces the cost of three-phase AC control appliances, reduces the volume of switching appliances, greatly improves the electrical life and operation reliability of appliances, and can use low-voltage switches Electrical appliances are combined into switching appliances with higher voltage levels.

Description of drawings

Fig. 1 is a schematic diagram of the electrical connection of Embodiment 1 of the present invention.

Fig. 2 is a schematic diagram of the electrical connection of Embodiment 2 of the present invention.

Fig. 3 is a schematic diagram of the electrical connection of the third embodiment of the present invention.

Fig. 4 is a schematic diagram of the electrical connection of Embodiment 4 of the present invention.

Fig. 5 is a schematic diagram of the electrical connection of Embodiment 5 of the present invention.

Fig. 6 is a schematic diagram of the electrical connection of the sixth embodiment of the present invention.

Fig. 7 is a schematic diagram of the electrical connection of the seventh embodiment of the present invention.

Fig. 8 is a schematic diagram of the electrical connection of the eighth embodiment of the present invention.

Note: In Figure 1, Figure 2, Figure 3 and Figure 4, A1 represents the first contact group, A2 represents the second contact group, B1 represents the third contact group, B2 represents the fourth contact group, C1 represents the fifth Contact group, C2 means the sixth contact group, E1 means the first electromagnetic mechanical action mechanism, E2 means the second electromagnetic mechanical action mechanism, H1 means the third electromagnetic mechanical action mechanism, H2 means the fourth electromagnetic mechanical action mechanism, G1 means The fifth electromagnetic mechanical action mechanism, G2 represents the sixth electromagnetic mechanical action mechanism;

In Figure 5, Figure 6, Figure 7 and Figure 8, A1 represents the first contact group, A2 represents the second contact group, B1 represents the third contact group, B2 represents the fourth contact group, C3 represents the seventh contact Group, E1 represents the first electromagnetic mechanical action mechanism, E2 represents the second electromagnetic mechanical action mechanism, H1 represents the third electromagnetic mechanical action mechanism, H2 represents the fourth electromagnetic mechanical action mechanism, and G3 represents the seventh electromagnetic mechanical action mechanism.

Detailed ways

Below in conjunction with accompanying drawing, the technical solution of the utility model is described in detail.

The utility model provides a three-phase AC low-voltage arc-free electrical contact device, which is characterized in that, as shown in Figures 1 to 4, it includes: a first contact group A1, a second contact group A2, a third contact Group B1, fourth contact group B2, first electromagnetic mechanical action mechanism E1, second electromagnetic mechanical action mechanism E2, third electromagnetic mechanical action mechanism H1, fourth electromagnetic mechanical action mechanism H2, single-chip microcomputer control system I, first two Diode D1 and second diode D2;

One end of the first contact group A1 is connected to the first phase Y1 of the three-phase power supply, and the other end is connected to one end of the second contact group A2; the other end of the second contact group A2 is connected to the load F Connected; one end of the first electromagnetic mechanical action mechanism E1 is connected to the control end of the first contact group A1, and the other end is connected to the first output end of the single-chip microcomputer control system I; the second electromagnetic mechanical action mechanism E2 one end links to each other with the control end of described second contact group A2, and the other end links to each other with the second output end of described single-chip microcomputer control system 1;

One end of the third contact group B1 is connected to the second phase Y2 of the three-phase power supply, and the other end is connected to one end of the fourth contact group B2; the other end of the fourth contact group B2 is connected to the load F; One end of the third electromagnetic mechanical action mechanism H1 is connected to the control end of the third contact group B1, and the other end is connected to the third output end of the single-chip microcomputer control system I; one end of the fourth electromagnetic mechanical action mechanism H2 It is connected with the control end of the fourth contact group B2, and the other end is connected with the fourth output end of the single-chip microcomputer control system I.

It also includes the fifth contact group C1, the sixth contact group C2, the fifth electromagnetic mechanical action mechanism G1 and the sixth electromagnetic mechanical action mechanism G2; one end of the fifth contact group C1 is connected to the third phase of the three-phase power supply Y3 is connected, and the other end is connected to one end of the sixth contact group C2; the other end of the sixth contact group C2 is connected to the load F; one end of the fifth electromagnetic mechanical action mechanism G1 is connected to the fifth contact The control terminal of head group C1 links to each other, and the other end links to each other with the 5th output terminal of described single-chip microcomputer control system (1); Described the 6th electromechanical action mechanism G2 one end links to each other with the control terminal of described 6th contact group C2, The other end links to each other with the sixth output end of described single-chip microcomputer control system 1.

Example 1

As shown in FIG. 1 , the first diode D1 is connected in parallel to both ends of the first contact group A1 ; the second diode D2 is connected in parallel to both ends of the third contact group B1 .

Example 2

As shown in FIG. 2 , the first diode D1 is connected in parallel to both ends of the second contact group A2 ; the second diode D2 is connected in parallel to both ends of the third contact group B1 .

Example 3

As shown in FIG. 3 , the first diode D1 is connected in parallel to both ends of the first contact group A1 ; the second diode D2 is connected in parallel to both ends of the fourth contact group B2 .

Example 4

As shown in FIG. 4 , the first diode D1 is connected in parallel to both ends of the second contact group A2 ; the second diode D2 is connected in parallel to both ends of the fourth contact group B2 .

In order for those skilled in the art to further understand the contact device of a three-phase AC low-voltage arc-free electrical appliance provided by the utility model, the device will be described below in conjunction with the control method of Embodiment 1 to Embodiment 4. It should be pointed out that in The control method involved in the explanation process is not the protected object of the utility model, and the utility model only protects the structure of the device and its connection relationship.

The three-phase AC low-voltage arc-free electrical contact device includes two working states, wherein:

Switch ON state: the single-chip microcomputer control system I drives the two contact groups in the one-phase line without parallel diodes to be closed first through the corresponding electromagnetic mechanical action mechanism, that is, the third phase Y3 in Embodiment 1~Embodiment 4 The fifth contact group C1 and the sixth contact group C2 on the line are closed first, and since the other two-phase lines have not been connected, the switch on this phase line is turned on without load;

After the single-chip microcomputer control system I detects the voltage or current signal, it drives the contact group on the two-phase line connected with the diode through the corresponding electromagnetic mechanical action mechanism, that is, drives the contact group on the first phase Y1 line and the second phase Y2 line. When the diodes connected in parallel on the corresponding phase line do not have the conduction conditions, the contacts that are not connected in parallel with the diodes on the line are combined to switch, because the diodes have no conduction conditions at this time, and the contact groups in parallel with the diodes are not Therefore, the contact groups without parallel diodes are closed without arcing; that is, the second contact group A2 and the fourth contact group B2 are closed in Example 1, and they are arc-free closing, and the first contact group A1 and the third contact group B1 are not closed; in embodiment 2, the first contact group A1 and the fourth contact group B2 are closed, and it is arc-free closing, the second contact group A2 and the third contact group B1 is not closed; in embodiment 3, the second contact group A2 and the third contact group B1 are closed, and it is arc-free closing, and the first contact group A1 and the fourth contact group B2 are not closed; implementation In Example 4, the first contact group A1 and the third contact group B1 are switched on without arcing, and the second contact group A2 and the fourth contact group B2 are not closed.

Then the single-chip microcomputer control system drives the contact combination gate of parallel diodes through the electromagnetic mechanical action mechanism when the diodes are in the conduction condition. Since the diodes are in the conduction state, the contact group is also arc-free closing, realizing the arc-free connection of the three-phase circuit. Pass. That is, in embodiment 1, the first contact group A1 and the third contact group B1 are closed, and it is arc-free closing; in embodiment 2, the second contact group A2 and the third contact group B1 are closed, and it is Arc-free closing; in embodiment 3, the first contact group A1 and the fourth contact group B2 are closed, and arc-free closing; in embodiment 4, the second contact group A2 and the fourth contact group B2 are closed Gate, and arc-free closing.

Switch breaking state: After the single-chip microcomputer control system detects the voltage or current signal, it drives the contact group on the two-phase line connected with the diode through the electromagnetic mechanical action mechanism. There is a contact group with a diode, and then when the diode does not have the conduction condition, break the other contact group that is not connected in parallel with the diode. Since the diode is cut off at this time, there is no current in this phase, and the contact group has no arc breaking; After the two-phase circuit of the diode is broken, the single-chip microcomputer control system finally drives the contact group of the one-phase without diode to break through the electromagnetic mechanical action mechanism, so as to realize the breaking of the three-phase circuit without arcing. That is, in Embodiment 1, the first contact group A1 and the third contact group B1 are first disconnected according to whether the diode is on or not, then the second contact group A2 and the fourth contact group B2 are disconnected, and finally The fifth contact group C1 and the sixth contact group C2; in embodiment 2, the second contact group A2 and the third contact group B1 are first disconnected according to the conduction of the diode, and the first contact group is secondly disconnected Group A1 and the fourth contact group B2, and finally disconnect the fifth contact group C1 and the sixth contact group C2; in embodiment 3, first disconnect the first contact group A1 and the sixth contact group A1 according to the conduction of the diode Four contact group B2, secondly disconnect the second contact group A2 and the third contact group B1, finally disconnect the fifth contact group C1 and the sixth contact group C2; in embodiment 4, according to the conduction of the diode Whether to first disconnect the second contact group A2 and the fourth contact group B2, secondly disconnect the first contact group A1 and the third contact group B1, and finally disconnect the fifth contact group C1 and the sixth contact Group C2.

Further, the first contact group A1, the second contact group A2, the third contact group B1, the fourth contact group B2, the fifth contact group C1 and the The sixth contact group C2 includes N pairs of dynamic and static contacts, N is a positive integer greater than or equal to 1, and all of them are silver-based contact materials or copper materials.

In addition, a three-phase AC low-voltage arc-free electrical contact device is also provided, which is characterized in that, as shown in Figures 5 to 8, it includes: a first contact group A1, a second contact group A2, a third contact Group B1, fourth contact group B2, first electromagnetic mechanical action mechanism E1, second electromagnetic mechanical action mechanism E2, third electromagnetic mechanical action mechanism H1, fourth electromagnetic mechanical action mechanism H2, single-chip microcomputer control system I, first two Diode D1 and second diode D2;

One end of the first contact group A1 is connected to the first phase Y1 of the three-phase power supply, and the other end is connected to one end of the second contact group A2; the other end of the second contact group A2 is connected to the load F connected; one end of the first electromagnetic mechanical action mechanism E1 is connected to the control end of the first contact group A1, and the other end is connected to the first output end of the single-chip microcomputer control system I; the second electromagnetic mechanical action mechanism E2 one end links to each other with the control end of described second contact group A2, and the other end links to each other with the second output end of described single-chip microcomputer control system 1;

One end of the third contact group B1 is connected to the second phase Y2 of the three-phase power supply, and the other end is connected to one end of the fourth contact group B2; the other end of the fourth contact group B2 is connected to the load F; One end of the third electromagnetic mechanical action mechanism H1 is connected to the control end of the third contact group B1, and the other end is connected to the third output end of the single-chip microcomputer control system I; one end of the fourth electromagnetic mechanical action mechanism H2 It is connected with the control end of the fourth contact group B2, and the other end is connected with the fourth output end of the single-chip microcomputer control system I.

It also includes a seventh contact group C3 and a seventh electromagnetic mechanical action mechanism G3; one end of the seventh contact group C3 is connected to the third phase Y3 of the three-phase power supply, and the other end is connected to the load F; the seventh electromagnetic mechanical action One end of the mechanism G3 is connected to the control end of the seventh contact group C3, and the other end is connected to the fifth output end of the single-chip microcomputer control system I.

Example 5

As shown in FIG. 5 , the first diode D1 is connected in parallel to both ends of the first contact group A1 ; the second diode D2 is connected in parallel to both ends of the third contact group B1 .

Example 6

As shown in FIG. 6 , the first diode D1 is connected in parallel to both ends of the second contact group A2 ; the second diode D2 is connected in parallel to both ends of the third contact group B1 .

Example 7

As shown in FIG. 7 , the first diode D1 is connected in parallel to both ends of the first contact group A1 ; the second diode D2 is connected in parallel to both ends of the fourth contact group B2 .

Example 8

As shown in FIG. 8 , the first diode D1 is connected in parallel to both ends of the second contact group A2 ; the second diode D2 is connected in parallel to both ends of the fourth contact group B2 .

In order for those skilled in the art to further understand the three-phase AC low-voltage arc-free electrical contact device provided by the utility model, the device will be described below in conjunction with the control methods in Embodiment 5 to Embodiment 8. It should be pointed out that The control method involved in the description process is not the protected object of the utility model, and the utility model only protects the structure of the device and its connection relationship.

The three-phase AC low-voltage arc-free electrical contact device includes two working states, wherein:

Switch ON state: The single-chip microcomputer control system 1 drives the two contact groups in the one-phase line without parallel diodes to close first through the corresponding electromagnetic mechanical action mechanism, that is, the third phase Y3 in Embodiment 5~Embodiment 8 The seventh contact group C3 on the line is closed first, and since the other two-phase lines have not been connected, the switch on this phase line is connected without load;

After the single-chip microcomputer control system I detects the voltage or current signal, it drives the contact group on the two-phase line connected with the diode through the corresponding electromagnetic mechanical action mechanism, that is, drives the contact group on the first phase Y1 line and the second phase Y2 line. When the diodes connected in parallel on the corresponding phase line do not have the conduction conditions, the contacts that are not connected in parallel with the diodes on the line are combined to switch, because the diodes have no conduction conditions at this time, and the contact groups in parallel with the diodes are not Therefore, the contact group without parallel diodes is closed without arcing; that is, the second contact group A2 and the fourth contact group B2 are closed in Example 5, and they are arc-free closing, and the first contact group A1 and the third contact group B1 are not closed; in embodiment 6, the first contact group A1 and the fourth contact group B2 are closed, and arc-free closing, the second contact group A2 and the third contact group B1 is not closed; in embodiment 7, the second contact group A2 and the third contact group B1 are closed, and it is arc-free closing, and the first contact group A1 and the fourth contact group B2 are not closed; implementation In Example 8, the first contact group A1 and the third contact group B1 are switched on without arcing, and the second contact group A2 and the fourth contact group B2 are not closed.

Then the single-chip microcomputer control system drives the contact combination gate of parallel diodes through the electromagnetic mechanical action mechanism when the diodes are in the conduction condition. Since the diodes are in the conduction state, the contact group is also arc-free closing, realizing the arc-free connection of the three-phase circuit. Pass. That is, in embodiment 5, the first contact group A1 and the third contact group B1 are closed, and it is arc-free closing; in embodiment 6, the second contact group A2 and the third contact group B1 are closed, and it is Arc-free closing; in embodiment 7, the first contact group A1 and the fourth contact group B2 are closed, and it is arc-free closing; in embodiment 8, the second contact group A2 and the fourth contact group B2 are closed Gate, and arc-free closing.

Switch breaking state: After the single-chip microcomputer control system detects the voltage or current signal, it drives the contact group on the two-phase line connected with the diode through the electromagnetic mechanical action mechanism. There is a contact group with a diode, and then when the diode does not have the conduction condition, break the other contact group that is not connected in parallel with the diode. Since the diode is cut off at this time, there is no current in this phase, and the contact group has no arc breaking; After the two-phase circuit of the diode is broken, the single-chip microcomputer control system finally drives the contact group of the one-phase without diode to break through the electromagnetic mechanical action mechanism, so as to realize the breaking of the three-phase circuit without arcing. That is, in Embodiment 5, the first contact group A1 and the third contact group B1 are first disconnected according to whether the diode is turned on or not, then the second contact group A2 and the fourth contact group B2 are disconnected, and finally The seventh contact group C3; in embodiment 6, the second contact group A2 and the third contact group B1 are first disconnected according to the conduction of the diode, and then the first contact group A1 and the fourth contact group are disconnected Group B2, and finally disconnect the seventh contact group C3; in embodiment 7, according to whether the diode is conducting or not, first disconnect the first contact group A1 and the fourth contact group B2, and secondly disconnect the second contact group A2 and the third contact group B1, and finally disconnect the seventh contact group C3; in embodiment 8, the second contact group A2 and the fourth contact group B2 are first disconnected according to the conduction of the diode, and then the second contact group B2 is disconnected. Open the first contact group A1 and the third contact group B1, and finally disconnect the seventh contact group C3.

Further, the first contact group A1, the second contact group A2, the third contact group B1, the fourth contact group B2 and the seventh contact group C3 all include N For static and dynamic contacts, N is a positive integer greater than or equal to 1, and they are all silver-based contact materials or copper materials.

The above are the preferred embodiments of the utility model, and all changes made according to the technical solution of the utility model, when the functional effect produced does not exceed the scope of the technical solution of the utility model, all belong to the protection scope of the utility model.

Claims (7)

1. A three-phase AC low-voltage arc-free electrical contact device, characterized in that it includes: a first contact group, a second contact group, a third contact group, a fourth contact group, a first electromagnetic mechanical action Mechanism, second electromagnetic mechanical action mechanism, third electromagnetic mechanical action mechanism, fourth electromagnetic mechanical action mechanism, single-chip microcomputer control system, first diode and second diode; One end of the first contact group is connected to the first phase of the three-phase power supply, and the other end is connected to one end of the second contact group; the other end of the second contact group is connected to the load; the second contact group is connected to the load; One end of an electromagnetic mechanical action mechanism is connected to the control end of the first contact group, and the other end is connected to the first output end of the single-chip microcomputer control system; one end of the second electromagnetic mechanical action mechanism is connected to the second contact The control terminal of the group is connected, and the other end is connected with the second output terminal of the single-chip microcomputer control system; the first diode is connected in parallel at both ends of the first contact group or the second contact group; One end of the third contact group is connected to the second phase of the three-phase power supply, and the other end is connected to one end of the fourth contact group; the other end of the fourth contact group is connected to the load; the first One end of the three electromagnetic mechanical action mechanisms is connected to the control end of the third contact group, and the other end is connected to the third output end of the single-chip microcomputer control system; one end of the fourth electromagnetic mechanical action mechanism is connected to the fourth contact The control end of the group is connected, and the other end is connected to the fourth output end of the single-chip microcomputer control system; the second diode is connected in parallel to both ends of the third contact group or the fourth contact group. 2. A three-phase AC low-voltage arcless electrical contact device according to claim 1, characterized in that it also includes a fifth contact group, a sixth contact group, a fifth electromagnetic mechanical action mechanism and a sixth electromagnetic Mechanical action mechanism; One end of the fifth contact group is connected to the third phase of the three-phase power supply, and the other end is connected to one end of the sixth contact group; the other end of the sixth contact group is connected to the load; the second One end of the fifth electromagnetic mechanical action mechanism is connected to the control end of the fifth contact group, and the other end is connected to the fifth output end of the single-chip microcomputer control system; one end of the sixth electromagnetic mechanical action mechanism is connected to the sixth contact The control end of the group is connected, and the other end is connected with the sixth output end of the single-chip microcomputer control system. 3. A contact device for a three-phase AC low-voltage arcless electrical appliance according to claim 1, characterized in that: it also includes a seventh contact group and a seventh electromagnetic mechanical action mechanism; One end of the seventh contact group is connected to the third phase of the three-phase power supply, and the other end is connected to the load; one end of the seventh electromagnetic mechanical action mechanism is connected to the control end of the seventh contact group, and the other end is connected to the The fifth output end of the single-chip microcomputer control system is connected. 4. A contact device for a three-phase AC low-voltage arcless electrical appliance according to claim 2, characterized in that: the first contact group, the second contact group, the third contact group, The fourth contact group, the fifth contact group and the sixth contact group all include N pairs of dynamic and static contacts, and N is a positive integer greater than or equal to 1. 5. A three-phase AC low-voltage arc-free electrical contact device according to claim 2, characterized in that: the first contact group, the second contact group, the third contact group, The fourth contact group, the fifth contact group and the sixth contact group are all silver-based contact materials or copper materials. 6. A contact device for a three-phase AC low-voltage arcless electrical appliance according to claim 3, characterized in that: the first contact group, the second contact group, the third contact group, Both the fourth contact group and the seventh contact group include N pairs of dynamic and static contacts, where N is a positive integer greater than or equal to 1. 7. A three-phase AC low-voltage arc-free electrical contact device according to claim 3, characterized in that: the first contact group, the second contact group, the third contact group, Both the fourth contact group and the seventh contact group are silver-based contact materials or copper materials.