CN217008949U - Switch system with moving contact in multipoint contact - Google Patents

Abstract

A switching system having movable contacts with multiple contacts, comprising: two fixed contacts and a moving contact; one of the fixed contacts is connected to a first power supply source, and the other fixed contact can be connected to a second power supply source; the moving contact comprises a first moving contact support and a second moving contact support; the moving contact is switched between the two fixed contacts to be connected with a first power supply or a second power supply; a public contact convex hull, a first main contact convex hull and a second main contact convex hull are respectively arranged at one end of the first movable contact support and the second movable contact support; when the moving contact is connected with a first power supply or a second power supply, one of the first main contact convex hull and the second main contact convex hull and the common contact convex hull are in contact with the fixed contact; the height of the common contact convex hull is less than or equal to the height of the first main contact convex hull and the second main contact convex hull.

Description

Switch system with moving contact in multipoint contact

Technical Field

The present disclosure relates to a switching system having a movable contact with multiple point contacts.

Background

In the prior art, the electrical performance of an Automatic Transfer Switch (ATS) is mainly shown in both on-off capacity and Icm/Icw, wherein the rated short-circuit on capacity (Icm) refers to the highest instantaneous current value that the ATS can bear under a rated voltage value under specified conditions, and the short-time withstand current (Icw) refers to the capacity of tolerating 0.05s, 0.1s, 0.25s, 0.5s or 1s and the like under certain voltage, short-circuit current and power factor without allowing the switch to be disconnected, and the capacity is an assessment index for the electrical stability and thermal stability of the ATS. The existing Automatic Transfer Switch (ATS) has the technical defects that the moving contact is unstable in support under a closing state, small in short-time withstand current and easy to ablate the moving contact on the moving contact.

SUMMERY OF THE UTILITY MODEL

To address one or more of the deficiencies in the prior art, according to one aspect of the present disclosure, a switching system having a movable contact with multiple contacts is provided, the switching system comprising: two static contacts and a moving contact.

One of the fixed contacts is connected to a first power supply source, and the other fixed contact can be connected to a second power supply source.

The moving contact comprises a first moving contact support and a second moving contact support.

The moving contact is switched between the two fixed contacts to be connected with the first power supply or the second power supply or not to be connected with the first power supply and the second power supply.

And a public contact convex hull, a first main contact convex hull and a second main contact convex hull are respectively arranged at one end of the first moving contact support and the second moving contact support.

When the movable contact 2 is connected to the first power supply source, the first main contact convex hull 212 on the first movable contact support 21, the first main contact convex hull 213 on the second movable contact support 22, and the common contact convex hulls 211 and 221 contact the fixed contact 1.

When the movable contact 2 is connected to the second power supply, the second main contact convex hull 222 on the first movable contact support 21, the second main contact convex hull 223 on the second movable contact support 22, and the common contact convex hulls 211 and 221 are in contact with the fixed contact 1.

The height of the common contact convex hull is less than or equal to the height of the first main contact convex hull and the second main contact convex hull.

According to the above-mentioned one aspect of the disclosure, the height of the first main contact convex hull and the height of the second main contact convex hull are the same.

According to the above aspects of the present disclosure, a load side convex hull is provided on the other end of the first movable contact support and the second movable contact support.

The height of the load side convex hull is the same as the height of the first and second main contact convex hulls.

According to the above aspects of the present disclosure, in a transverse direction (width direction) of the first movable contact support and the second movable contact support, the first main contact convex hull and the second main contact convex hull are arranged side by side.

In a longitudinal direction (a length direction) of the first movable contact support and the second movable contact support, the common contact convex hull is disposed adjacent to the first main contact convex hull and the second main contact convex hull and closer to an outer edge of the one end of the first movable contact support and the second movable contact support than the first main contact convex hull and the second main contact convex hull.

According to the above aspects of the disclosure, the common contact lobe, the first main contact lobe, the second main contact lobe and the load side lobe each have an arcuate outer surface.

The highest point of the arc-shaped outer surface of the common contact convex hull is lower than or equal to the highest points of the arc-shaped outer surfaces of the first main contact convex hull, the second main contact convex hull and the load side convex hull.

The highest point of the arc-shaped outer surface of the common contact convex hull is 0.01 to 0.05 mm, preferably 0.03 mm, lower than the highest points of the arc-shaped outer surfaces of the first main contact convex hull, the second main contact convex hull and the load side convex hull.

In a transverse direction (width direction) of the first movable contact support and the second movable contact support, a highest point of the arc-shaped outer surface of the common contact convex hull is substantially located between a highest point of the arc-shaped outer surface of the first main contact convex hull and a highest point of the arc-shaped outer surface of the second main contact convex hull.

According to the above aspects of the present disclosure, when the movable contact is in contact with one of the fixed contacts, the common contact convex hull and the first main contact convex hull are in conduction with one of the fixed contacts.

When the moving contact is in contact with the other one of the fixed contacts, the common contact convex hull and the second main contact convex hull are conducted with the other one of the fixed contacts.

According to the above aspects of the present disclosure, the common contact convex hull, the first main contact convex hull and the second main contact convex hull are each made of a conductive metal material; the first main contact convex hull and the second main contact convex hull are arranged on one end of the first movable contact support and the second movable contact support or the common contact convex hull by a welding or electroplating method, and the first main contact convex hull and the second main contact convex hull are integrally formed with one end of the first movable contact support and the one end of the second movable contact support.

According to the above aspects of the present disclosure, the movable contact further includes a movable contact holder, a pressure spring, and a pressure spring holder.

Under the combined action of the moving contact holder, the pressure spring and the pressure spring holder, the first moving contact support and the second moving contact support are held in the moving contact holder.

The pressure spring retainer is in a rectangular annular shape and is held in the movable contact retainer, and the first movable contact support, the second movable contact support and the pressure spring pass through the pressure spring retainer.

The pressure spring acts between the pressure spring holder and the first movable contact support and between the pressure spring holder and the second movable contact support, thereby pressing the first movable contact support and the second movable contact support toward each other.

One end of the first movable contact support and one end of the second movable contact support extend out of the movable contact holder.

According to the above aspects of the present disclosure, one end of the static contact has a gradually-changed chamfer portion, so as to facilitate the insertion of the static contact between the first movable contact support and the second movable contact support.

The stationary contact is disposed on the tapered chamfered portion.

According to the above aspects of the disclosure, a stationary contact notch is disposed on the stationary contact.

When the switch cuts off current, electric arcs generated between the static contact of the static contact and the public contact convex hull, the first main contact convex hull and the second main contact convex hull of the movable contact can be guided by the gap of the static contact, so that the electric arcs are quickly transferred to the arc striking sheet, and the static contact, the public contact convex hull, the first main contact convex hull and the second main contact convex hull are protected from being ablated by the electric arcs.

According to the above aspects of the present disclosure, the other ends of the first and second movable contact supports are pivotally connected to an outlet terminal via the load side convex hull.

The outlet terminal is electrically connected with the load.

And the other end of the static contact is connected with the first power supply and the second power supply through power supply incoming line terminals.

According to the above aspects of the present disclosure, a pressure acting region is provided on a side of the first movable contact support and the second movable contact support that face away from the common contact convex hull, the first main contact convex hull and the second main contact convex hull, and the pressure spring acts on the pressure acting region.

According to the above aspects of the disclosure, the contact between the common contact convex hull and the fixed contact has a first contact resistance value, and the contact between the first main contact convex hull and the fixed contact has a second contact resistance value, where the first contact resistance value is smaller than the second contact resistance value. Therefore, the common contact convex hull can carry a larger current than the first main contact convex hull and the second main contact convex hull, thereby protecting the first main contact convex hull and the second main contact convex hull.

According to the present disclosure, the common contact convex hull is used as a common contact point of two power supplies and the height of the common contact convex hull is lower than or equal to the height of the first main contact convex hull, the height of the second main contact convex hull and the height of the load side convex hull, so that a three-point supporting effect of the moving contact can be well ensured when the switch is switched on (for example, as shown by a thick solid line triangle in fig. 6, the first moving contact support and the second moving contact support are respectively supported by the corresponding first main contact convex hull, the common contact convex hull and the load side convex hull), and the contact stability is improved, thereby reducing the risk of short fusion welding resistance.

For each of the first movable contact support and the second movable contact support, one-point contact is changed into two-point contact during switching-on, namely, the common contact convex hull and the corresponding main contact convex hull both participate in contact with the fixed contact. The movable contact structure with the multipoint contact can bear larger current in a closing state, so that the short-time current tolerance performance of the switch system is remarkably improved.

So that the manner in which the disclosure herein recited may be better understood, and in which the contributions to the art may be better appreciated, the disclosure has been summarized rather broadly. There are, of course, embodiments of the disclosure that will be described below and which will form the subject matter of the claims appended hereto.

As such, those skilled in the art will appreciate that the conception, upon which this disclosure is based, may readily be utilized as a basis for the designing of other structures, methods and systems for carrying out the several purposes of the present disclosure. It is important, therefore, that the appended claims be regarded as including such equivalent constructions insofar as they do not depart from the spirit and scope of the present disclosure.

Drawings

The present disclosure will be better understood and its advantages will become more apparent to those skilled in the art from the following drawings. The drawings described herein are for illustrative purposes only of selected embodiments and not all possible implementations and are not intended to limit the scope of the present disclosure.

FIG. 1 illustrates a switching system in a double split state according to the present disclosure;

fig. 2 illustrates a switching system in a closed state according to the present disclosure;

FIG. 3 shows a simplified perspective view of FIG. 2 in accordance with the present disclosure;

fig. 4 illustrates an assembled perspective view of the first movable contact support, the second movable contact support, the pressure spring and the pressure spring holder according to the present disclosure;

fig. 5 illustrates a first main contact lobe, a second main contact lobe, a common contact lobe and a load side lobe disposed on a first movable contact support and a second movable contact support in accordance with the present disclosure;

FIG. 6 is a top view of FIG. 5, wherein three points of the first main contact lobe, the common contact lobe, and the load side lobe form a stabilizing surface;

fig. 7 illustrates a pressure acting region of a pressure spring acting on the respective first movable contact support and second movable contact support according to the present disclosure;

fig. 8 is a top view of fig. 5 wherein the forces are balanced at both the common contact lobe and the load side lobe when the movable contact is in the closed position;

fig. 9 is a partial enlarged view of fig. 5, which shows that the first and second main contact convex hulls arranged on the first and second movable contact supports contact the fixed contact with a second contact resistance value, and the common contact convex hull contacts the fixed contact with a first contact resistance value.

Detailed Description

Specific embodiments according to the present disclosure are described in detail below with reference to the accompanying drawings.

Fig. 1 illustrates a switching system having a movable contact with multiple contacts in an open state according to one embodiment of the present disclosure. Fig. 2 illustrates a switching system in a closed state according to the above-described embodiments of the present disclosure.

In fig. 1 and 2, the switching system comprises two fixed contacts 1 and a movable contact 2, one of the fixed contacts 1 is connectable to a first power supply source (not shown), the other fixed contact 1 is connectable to a second power supply source (not shown), and the movable contact 2 is connectable to a load (not shown).

In fig. 1, the movable contacts 2 are in a double split position, so that the movable contacts 2 do not contact with the respective stationary contacts 1. In fig. 2 and 3, the movable contact 2 is in a closing position, the movable contact 2 is in contact with one of the fixed contacts 1, and the first power supply supplies power to the load.

The movable contact 2 can be switched between the two fixed contacts 1.

When the movable contact 2 is in contact with the other one of the fixed contacts 1, the second power supply supplies power to the load.

As shown in fig. 4, the movable contact 2 is in a clamping structure, and includes a first movable contact support 21 and a second movable contact support 22.

The first movable contact support 21 and the second movable contact support 22 are arranged facing each other and are separated from each other at one of their ends.

As shown in fig. 5, a common contact convex hull 211, 221, a first main contact convex hull 212, 222 and a second main contact convex hull 213, 223 are respectively disposed on one end of the first movable contact support 21 and the second movable contact support 22, and a load side convex hull 214, 224 is disposed on the other end of the first movable contact support 21 and the second movable contact support 22.

In a transverse direction (width direction) of the first movable contact support 21 and the second movable contact support 22, the first main contact convex hulls 212 and 222 and the second main contact convex hulls 213 and 223 are arranged side by side.

In the longitudinal direction (length direction) of the first movable contact support 21 and the second movable contact support 22, the common contact convex hull 211, 221 is disposed adjacent to the first main contact convex hull 212, 222 and the second main contact convex hull 213, 223 and is closer to the outer edge of the one end of the first movable contact support 21 and the second movable contact support 22 than the first main contact convex hull 212, 222 and the second main contact convex hull 213, 223.

As shown in fig. 5 and 9, the common contact convex hull 211, 221, the first main contact convex hull 212, 222, the second main contact convex hull 213, 223, and the load side convex hull 214, 224 each have an arcuate outer surface, such as a spherical outer surface.

The highest point of the curved outer surface of the common contact convex hull 211, 221 is lower than or equal to the highest point of the curved outer surfaces of the first main contact convex hull 212, 222, the second main contact convex hull 213, 223 and the load side convex hull 214, 224, for example 0.01 mm to 0.05 mm lower, preferably 0.03 mm lower.

The highest point of the curved outer surface of the first main contact convex hull 212, 222, the highest point of the curved outer surface of the second main contact convex hull 213, 223 and the highest point of the curved outer surface of the load side convex hull 214, 224 have the same height.

In a transverse direction (width direction) of the first movable contact support 21 and the second movable contact support 22, a highest point of the arc-shaped outer surface of the common contact convex hull 211, 221 is substantially located between a highest point of the arc-shaped outer surface of the first main contact convex hull 212, 222 and a highest point of the arc-shaped outer surface of the second main contact convex hull 213, 223.

The common contact convex hulls 211, 221, the first main contact convex hulls 212, 222 and the second main contact convex hulls 213, 223 are all configured to be used for conducting current, wherein when the movable contact 2 contacts one of the fixed contacts 1 (as shown in fig. 3), the common contact convex hulls 211, 221, the first main contact convex hulls 212, 222 are conducted with one of the fixed contacts 1, and when the movable contact 2 contacts the other of the fixed contacts 1 (not shown), the common contact convex hulls 211, 221 and the second main contact convex hulls 213, 223 are conducted with the other of the fixed contacts 1.

The heights of the common contact convex hulls 211 and 221 are lower than or equal to the heights of the first main contact convex hulls 212 and 222, the second main contact convex hulls 213 and 223 and the load side convex hulls 214 and 224, so that a three-point supporting effect of the movable contact can be well guaranteed when the movable contact is switched on (for example, as shown by thick solid line triangles in fig. 6, the first movable contact support 21 and the second movable contact support 22 are respectively supported by the corresponding first main contact convex hulls 212 and 222, the common contact convex hulls 211 and 221 and the load side convex hulls 214 and 224), contact stability is improved, and short-tolerance fusion welding risk is reduced.

The common contact convex hulls 211, 221 play a key role when used in the Icw test. In the life test, the number of operation cycles of the common contact convex hull 211, 221 is twice as many as the number of operation cycles of the first main contact convex hull 212, 222 and the second main contact convex hull 213, 223.

The common contact convex hulls 211, 221, the first main contact convex hulls 212, 222 and the second main contact convex hulls 213, 223 are all made of an electrically conductive metal material.

The common contact convex hulls 211, 221, the first main contact convex hulls 212, 222 and the second main contact convex hulls 213, 223 are disposed on the one ends of the first movable contact support 21 and the second movable contact support 22 through methods of welding, electroplating and the like or the common contact convex hulls 211, 221, the first main contact convex hulls 212, 222 and the second main contact convex hulls 213, 223 are integrally formed with the one ends of the first movable contact support 21 and the second movable contact support 22.

As shown in fig. 3, the other ends of the first movable contact support 21 and the second movable contact support 22 are pivotally connected to the outlet terminal 3 via the load side convex hulls 214, 224.

The outlet terminal 3 is electrically connected to the load.

As shown in fig. 1, 2 and 4, the movable contact 2 further includes a movable contact holder 4, a pressure spring 5 and a pressure spring holder 6.

Under the combined action of the moving contact holder 4, the pressure spring 5 and the pressure spring holder 6, the first movable contact support 21 and the second movable contact support 22 are held in the movable contact holder 4, the pressure spring holder 6 is in the shape of a rectangular ring and is held in the movable contact holder 4, the first movable contact support 21, the second movable contact support 22 and the pressure spring 5 pass through the pressure spring holder 6, wherein the pressure spring 5 acts between the pressure spring holder 6 and the first movable contact support 21 and acts between the pressure spring holder 6 and the second movable contact support 22, thereby pressing said first movable contact support 21 and said second movable contact support 22 towards each other, wherein said one end of said first movable contact support 21 and said second movable contact support 22 protrudes from said movable contact holder 4.

Contact gaps exist among the common contact convex hull 211, the first main contact convex hull 212 and the second main contact convex hull 213 of the first movable contact support 21, and the common contact convex hull 221, the first main contact convex hull 222 and the second main contact convex hull 223 of the second movable contact support 22.

When the movable contact 2 is in the closing position (when contacting one of the fixed contacts 1), as shown in fig. 2 and 3, the fixed contact 11 of the fixed contact 1 can be located in the contact gap and can contact the common contact convex hull 211 and the first main contact convex hull 212 of the first movable contact support 21 and can contact the common contact convex hull 221 and the first main contact convex hull 222 of the second movable contact support 22.

When the movable contact 2 is in the closing position (when contacting with another one of the fixed contacts 1, not shown), the fixed contact 11 of the fixed contact 1 can be located in the contact gap and can contact with the common contact convex hull 211 and the second main contact convex hull 213 of the first movable contact support 21 and can contact with the common contact convex hull 221 and the second main contact convex hull 223 of the second movable contact support 22.

For each of the first movable contact support 21 and the second movable contact support 22, one-point contact is changed into two-point contact during switching on, that is, a common contact convex hull and a corresponding main contact convex hull both participate in contact with the fixed contact 1. The movable contact structure with the multipoint contact can bear larger current in a closing state, so that the short-time current tolerance performance of the switch system is remarkably improved.

As shown in fig. 7, pressure acting regions 215, 225 are provided on the sides of the first movable contact support 21 and the second movable contact support 22 that face away from the common contact convex hulls 211, 221, the first main contact convex hulls 212, 222, and the second main contact convex hulls 213, 223, and the pressure springs 5 act on the pressure acting regions 215, 225.

If the common contact convex hulls 211, 221 are higher than the first main contact convex hulls 212, 222 and the second main contact convex hulls 213, 223, when the movable contact 2 is in the switching-on position, as shown in fig. 8, the forces at the common contact convex hulls 211, 221 and the load side convex hulls 214, 224 are balanced (i.e., at the two solid circles in fig. 8), and the first main contact convex hulls 212, 222 and the second main contact convex hulls 213, 223 are in a floating state and cannot contact with the fixed contact 1. Therefore, the height of the common contact convex hull 211, 221 should be lower than or equal to the height of the first main contact convex hull 212, 222, the second main contact convex hull 213, 223 and the load-side convex hull 214, 224.

As shown in fig. 1 and 2, a holder driving unit 41 is provided outside the movable contact holder 4. A movable contact driving mechanism (not shown) actuates the first movable contact support 21 and the second movable contact support 22 to rotate between the opening position and the closing position by driving the holder driving portion 41.

The holder driving part 41 has a substantially flat cylindrical shape. A holder notch 411 is provided at an outer circumference of the holder driving part 41, and a holder recess 412 having a spline shape is provided at a center of a top surface of the holder driving part 41.

A holder partition (not shown) may be further disposed inside the movable contact holder 4. Under the action of the pressure spring 5, the first movable contact support 21 and the second movable contact support 22 respectively abut against two sides of the retainer partition.

Fig. 3 shows a stationary contact 1 according to the above-described embodiment of the present disclosure.

One end of the static contact 1 is provided with a gradually-changed chamfer part 14, so that the static contact 11 of the static contact 1 is convenient to be inserted into the contact gap. The stationary contact 11 is disposed on the tapered chamfer portion 14.

A static contact gap 12 is arranged on the static contact 1, when a switch cuts off current, an electric arc generated between the static contact 11 of the static contact 1 and the common contact convex hulls 211 and 221, the first main contact convex hulls 212 and 222 and the second main contact convex hulls 213 and 223 of the movable contact 2 can be guided by the static contact gap 12, so that the electric arc is rapidly transferred to an arc striking plate (not shown), and the static contact 11, the common contact convex hulls 211 and 221, the first main contact convex hulls 212 and 222 and the second main contact convex hulls 213 and 223 are protected from being ablated by the electric arc.

The other end of the static contact 1 is connected with the first power supply (not shown) through a power supply incoming line terminal 7.

Fig. 9 is a partially enlarged view of fig. 5, which shows that the contact between the first main contact convex hull and the second main contact convex hull which are arranged on the first movable contact support 21 and the second movable contact support 22 and the fixed contact has a second contact resistance value, and the contact between the common contact convex hull and the fixed contact has a first contact resistance value, wherein the first contact resistance value is smaller than the second contact resistance value, so that the common contact convex hull can carry a larger current than the first main contact convex hull and the second main contact convex hull, thereby protecting the first main contact convex hull and the second main contact convex hull from being ablated by an excessive current.

In fig. 3, the first movable contact support 21 and the second movable contact support 22 may be made of two different materials, so that at the instant of closing the movable contact, the amplitude and the frequency of the bounce of the first movable contact support 21 and the second movable contact support 22 have a deviation, thereby avoiding the occurrence of the phenomenon of simultaneous bounce and arcing, and thus improving the connection and disconnection performance.

The foregoing disclosure provides illustration and description, but is not intended to be exhaustive or to limit the embodiments to the precise form disclosed. Modifications and variations are possible in light of the above disclosure or may be acquired from practice of the embodiments.

Even though particular combinations of features are recited in the claims and/or disclosed in the specification, these combinations are not intended to limit the disclosure of the various embodiments. In fact, many of these features may be combined in ways not specifically recited in the claims and/or disclosed in the specification. Although each dependent claim listed below may be directly dependent on only one claim, the disclosure of various embodiments includes each dependent claim in combination with every other claim in the claim set.

No element, act, or instruction used herein should be construed as critical or essential unless explicitly described as such. In addition, as used herein, the articles "a" and "an" are intended to include one or more items, and may be used interchangeably with "one or more". In addition, as used herein, the article "the" is intended to include the item or items referenced by the conjoined article "the" and may be used interchangeably with "one or more". Further, as used herein, the term "set" is intended to include one or more items (e.g., related items, unrelated items, combinations of related and unrelated items, etc.) and may be used interchangeably with "one or more. Where only one item is intended, the phrase "only one item" or similar language is used. In addition, as used herein, the term "having," variants thereof, and the like are intended to be open-ended terms. Further, the phrase "based on" is intended to mean "based, at least in part, on" unless explicitly stated otherwise. In addition, as used herein, the term "or" when used in series is intended to be inclusive and may be used interchangeably with "and/or" unless specifically stated otherwise (e.g., if used in conjunction with "or" only one of ").

Claims (16)

1. A switching system having movable contacts with multiple contacts, said switching system comprising:

two fixed contacts and a moving contact;

one of the fixed contacts is connected to a first power supply source, and the other fixed contact can be connected to a second power supply source;

the moving contact comprises a first moving contact support and a second moving contact support;

the moving contact is switched between the two fixed contacts to be connected with the first power supply or the second power supply or not to be connected with the first power supply and the second power supply;

a public contact convex hull, a first main contact convex hull and a second main contact convex hull are respectively arranged at one end of the first movable contact support and the second movable contact support;

when the moving contact is connected with the first power supply, the first main contact convex hull on the first moving contact support, the first main contact convex hull on the second moving contact support and the common contact convex hull are in contact with the fixed contact;

when the moving contact is connected with the second power supply, the second main contact convex hull on the first moving contact support, the second main contact convex hull on the second moving contact support and the common contact convex hull are in contact with the fixed contact;

The height of the common contact convex hull is less than or equal to the height of the first main contact convex hull and the second main contact convex hull.

2. The switching system according to claim 1,

the height of the first main contact lobe and the height of the second main contact lobe are the same.

3. The switching system according to claim 2,

a load side convex hull is arranged at the other end of the first moving contact support and the second moving contact support;

the height of the load side convex hull is the same as the height of the first and second main contact convex hulls.

4. The switching system according to claim 3,

in a transverse direction of the first movable contact support and the second movable contact support, the first main contact convex hull and the second main contact convex hull are arranged side by side;

the common contact convex hull is disposed adjacent to the first main contact convex hull and the second main contact convex hull and closer to an outer edge of the one end of the first movable contact support and the second movable contact support than the first main contact convex hull and the second main contact convex hull in a longitudinal direction of the first movable contact support and the second movable contact support.

5. The switching system according to claim 3,

the common contact convex hull, the first main contact convex hull, the second main contact convex hull and the load side convex hull each have an arcuate outer surface;

the highest point of the arc-shaped outer surface of the common contact convex hull is lower than or equal to the highest points of the arc-shaped outer surfaces of the first main contact convex hull, the second main contact convex hull and the load side convex hull.

6. The switching system according to claim 5,

when the moving contact is contacted with one of the static contacts, the public contact convex hull and the first main contact convex hull are conducted with one of the static contacts;

when the moving contact is in contact with the other one of the fixed contacts, the common contact convex hull and the second main contact convex hull are conducted with the other one of the fixed contacts.

7. The switching system according to claim 5,

the first main contact convex hull and the second main contact convex hull are made of conductive metal materials;

the first main contact convex hull and the second main contact convex hull are arranged on one end of the first movable contact support and the second movable contact support or the common contact convex hull by a welding or electroplating method, and the first main contact convex hull and the second main contact convex hull are integrally formed with one end of the first movable contact support and the one end of the second movable contact support.

8. The switching system according to claim 5,

the moving contact also comprises a moving contact retainer, a pressure spring and a pressure spring retainer;

under the combined action of the moving contact holder, the pressure spring and the pressure spring holder, the first moving contact support and the second moving contact support are held in the moving contact holder;

the pressure spring retainer is in a rectangular annular shape and is held in the moving contact retainer, and the first moving contact support, the second moving contact support and the pressure spring penetrate through the pressure spring retainer; wherein

The pressure spring acts between the pressure spring holder and the first movable contact support and acts between the pressure spring holder and the second movable contact support so as to press the first movable contact support and the second movable contact support towards each other; wherein

One end of the first movable contact support and one end of the second movable contact support extend out of the movable contact holder.

9. The switching system according to claim 8,

one end of the static contact is provided with a gradually-changed chamfer part, so that the static contact of the static contact is conveniently inserted between the first movable contact support and the second movable contact support;

The stationary contact is disposed on the tapered chamfered portion.

10. The switching system according to claim 9,

a static contact notch is formed in the static contact;

when the switch cuts off current, electric arcs generated between the static contact of the static contact and the public contact convex hull, the first main contact convex hull and the second main contact convex hull of the movable contact can be guided by the gap of the static contact, so that the electric arcs are quickly transferred to the arc striking sheet, and the static contact, the public contact convex hull, the first main contact convex hull and the second main contact convex hull are protected from being ablated by the electric arcs.

11. The switching system according to claim 10,

the other ends of the first movable contact support and the second movable contact support are pivotally connected to an outlet terminal through the load-side bulge;

the outlet terminal is electrically connected with the load;

and the other end of the static contact is connected with the first power supply and the second power supply through power supply incoming line terminals.

12. The switching system according to claim 11,

a pressure acting region is provided on one side of the first movable contact support and the second movable contact support, which faces away from the common contact convex hull, the first main contact convex hull and the second main contact convex hull, and the pressure spring acts on the pressure acting region.

13. The switching system according to claim 12,

the contact between the public contact convex hull and the static contact has a first contact resistance value;

the contact between the first main contact convex hull and the static contact and the contact between the second main contact convex hull and the static contact have second contact resistance values; wherein

The first contact resistance value < the second contact resistance value.

14. The switching system according to claim 5,

the highest point of the arc-shaped outer surface of the common contact convex hull is 0.01 to 0.05 mm lower than the highest points of the arc-shaped outer surfaces of the first main contact convex hull, the second main contact convex hull and the load side convex hull.

15. The switching system according to claim 14,

the highest point of the arc-shaped outer surface of the common contact convex hull is 0.03 mm lower than the highest points of the arc-shaped outer surfaces of the first main contact convex hull, the second main contact convex hull and the load side convex hull.

16. The switching system according to claim 5,

in the transverse direction of the first movable contact support and the second movable contact support, the highest point of the arc-shaped outer surface of the public contact convex hull is located between the highest point of the arc-shaped outer surface of the first main contact convex hull and the highest point of the arc-shaped outer surface of the second main contact convex hull.

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