A relay with overcurrent protection

Abstract

The application discloses a relay with overcurrent protection, which comprises a shell, and further comprises a connecting sheet arranged in the interior of the shell, the top and bottom of the two ends of the connecting sheet are provided with contacts, one side of the connecting sheet is provided with two common contacts corresponding to the contacts, and the other side of the connecting sheet is provided with an upper contact and a lower contact corresponding to the contacts. The application sets movable arc-preventing mechanisms at the ends of the connecting sheet, and when the connecting sheet moves downward, the contacts are separated from the upper contact and the lower contact, at this time, the movable sleeve rotates, the arc baffle is moved from between the contacts and the lower contact to between the contacts and the upper contact, the generation of the arc is blocked, the movable arc-preventing mechanisms at the other ends of the connecting sheet are the same, and the arc-preventing mechanisms are rotated at the two ends of the connecting sheet, so that the arc-extinguishing operation is completed, and the space of the movable arc-preventing mechanisms is greatly reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of relays, in particular to a relay with overcurrent protection. BACKGROUND

[0002] The relay mainly works by using the principle of electromagnetic induction. When there is current passing through the coil (input loop part) of the relay, a magnetic field will be generated. This magnetic field will cause the armature to be attracted, thereby changing the state of the contact (output loop part). For example, the normally open contact will be closed, and the normally closed contact may be disconnected. It is like an "electromagnetic switch", and a small current signal of the coil can control the on-off of a large current circuit at the contact.

[0003] At present, the relay controls the opening and closing of the contact through the magnetic field. When the current and voltage in the circuit are too large and do not exceed the threshold of the overcurrent protection of the relay, the overcurrent protection of the relay will not be triggered. When the contact is opened and closed, the connection between the relay contacts will be disconnected, and the two contacts gradually move away. When the two contacts just separate, the gap is very small, at this time the circuit voltage is almost entirely applied between the contacts, forming a very strong electric field, which is easy to produce an electric arc under the action of the strong electric field. Then, as the distance between the contacts increases, the electric arc is gradually lengthened, and the high temperature generated by the electric arc will cause damage to the contacts of the relay, which will cause poor contact. In addition, the commonly used arc extinguishing cover is large in size, which is not conducive to the miniaturization design of the relay. SUMMARY

[0004] The purpose of the present application is to provide a relay with overcurrent protection to solve the problem that the relay contact is easy to produce an electric arc when it is disconnected, which will cause damage to the contacts of the relay, and the commonly used arc extinguishing cover is large in size, which is not conducive to the miniaturization design of the relay.

[0005] In order to achieve the above purpose, the present application provides the following technical scheme: a relay with overcurrent protection, comprising a shell, further comprising:

[0006] A connecting piece is arranged inside the shell, the top and bottom of both ends of the connecting piece are provided with contacts, one side of the connecting piece is provided with two common contacts, the common contacts correspond to the contacts, the other side of the connecting piece is provided with an upper contact and a lower contact, and the upper contact and the lower contact correspond to the contacts;

[0007] Two movable arc prevention mechanisms are arranged at both ends of the connecting piece, the movable arc prevention mechanism comprises a fixed shaft fixed at the end of the connecting piece, a movable sleeve in rotation connection with the fixed shaft, and an arc baffle, a driving mechanism is arranged below the connecting piece, the driving mechanism corresponds to the connecting piece, and a reset assembly is arranged at the top of the connecting piece;

[0008] A protection mechanism is arranged through the shell and is in sliding connection with the shell, and the protection mechanism is connected with the common contact.

[0009] Preferably, the upper contact is arranged above the connecting piece, the lower contact is arranged below the connecting piece, and the two common contacts are arranged on the upper side and the lower side of the connecting piece respectively and correspond to the upper contact and the lower contact respectively.

[0010] Preferably, the movable arc prevention mechanism further comprises a gear and a gear rack, the gear is fixed on one side of the movable sleeve, the gear is coaxially arranged with the movable sleeve, and the gear rack is fixed in the interior of the shell and is in engagement with the gear.

[0011] Preferably, the driving mechanism comprises a support frame, the support frame is fixed in the interior of the shell, an electromagnet is mounted on the support frame, and the electromagnet is arranged below the connecting piece.

[0012] Preferably, a control terminal is arranged through the bottom of the shell, and the control terminal is in electrical connection with the coil of the electromagnet.

[0013] Preferably, the reset assembly comprises a fixed sleeve, the fixed sleeve is arranged outside the connecting piece, a sliding sleeve is fixedly connected to the top of the fixed sleeve, a support column is arranged in the interior of the sliding sleeve, the support column is in sliding connection with the sliding sleeve, and the top end of the support column is fixedly connected to the inner wall of the shell.

[0014] Preferably, a through hole is arranged in the center of the support column, a connecting spring is arranged in the interior of the through hole, and the two ends of the connecting spring are connected with the fixed sleeve and the inner wall of the shell respectively.

[0015] Preferably, a magnetic attraction piece is fixedly connected to the bottom of the fixed sleeve, and the magnetic attraction piece is matched with the electromagnet.

[0016] Preferably, the protection mechanism comprises three load terminals arranged in the interior, the three load terminals are connected with the common contact, the upper contact and the lower contact respectively, and the load terminals are arranged through the shell and extend out of the shell.

[0017] Preferably, the load terminal connected with the common contact is interrupted in the middle, the two broken points of the load terminal are connected with spring contacts respectively, a sliding block is arranged through one side of the shell, the sliding block is in sliding connection with the shell, a fuse is mounted on the sliding block, the two ends of the fuse are connected with connecting terminals respectively, the two connecting terminals correspond to the two spring contacts respectively, and a buckle is arranged between the sliding block and the shell.

[0018] In the above technical solution, the present application has the following technical effects and advantages:

[0019] By setting the movable arc prevention mechanism at the end of the connecting piece, when the circuit between the common contact and the lower contact needs to be connected, the driving mechanism can be opened to make the connecting piece move downward, so that the contact is disconnected from the upper contact and the lower contact, at this time, the movable sleeve rotates to move the arc baffle from between the contact and the lower contact to between the contact and the upper contact, blocking the generation of the electric arc, and the movable arc prevention mechanism at the other end of the connecting piece is the same, by setting the rotating arc baffle at both ends of the connecting piece, the arc extinguishing operation can be completed, greatly reducing the space of the movable arc prevention mechanism.

[0020] By setting the movable arc prevention mechanism at both ends of the connecting piece, the arc extinguishing operation can be performed on the contacts at both ends of the connecting piece at the same time, and the arc extinguishing effect can be further improved.

[0021] By engaging the gear with the rack, the gear is driven to rotate in the process of the movement of the connecting piece, and then the movable sleeve is driven to rotate, so that the movable sleeve drives the arc baffle to rotate, and the rotation of the arc baffle can be automatically completed in the process of controlling the upward and downward movement of the connecting piece, so that the arc baffle can automatically shield and extinguish the arc above and below the connecting piece;

[0022] By setting the protection mechanism, on the one hand, the disconnected load wiring end is connected through the fuse, and on the other hand, the movable slider design can quickly replace the fuse after the fuse is damaged. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments described in the present application, and other drawings can also be obtained by those skilled in the art according to these drawings.

[0024] Figure 1 A schematic diagram of the overall structure of a relay with overcurrent protection provided by the embodiment of the present application.

[0025] Figure 2 A schematic diagram of the internal structure of a relay shell with overcurrent protection provided by the embodiment of the present application.

[0026] Figure 3 A schematic diagram of the internal structure of a relay reset assembly with overcurrent protection provided by the embodiment of the present application.

[0027] Figure 4 A schematic diagram of the overall structure of a relay connecting piece with overcurrent protection provided by the embodiment of the present application.

[0028] Figure 5A partial structure schematic view of a relay with overcurrent protection provided by an embodiment of the present application.

[0029] Figure 6 A partial structure schematic view of a movable anti-arc mechanism of a relay with overcurrent protection provided by an embodiment of the present application.

[0030] Figure 7 A connection structure schematic view of a protection mechanism and a common contact of a relay with overcurrent protection provided by an embodiment of the present application.

[0031] Figure 8 A whole structure schematic view of a protection mechanism of a relay with overcurrent protection provided by an embodiment of the present application.

[0032] Figure 9 A movement state schematic view of a movable anti-arc mechanism of a relay with overcurrent protection provided by an embodiment of the present application.

[0033] Explanation of reference signs:

[0034] 1, shell; 2, connecting piece; 3, contact; 4, common contact; 5, upper contact; 6, lower contact; 7, movable anti-arc mechanism; 8, driving mechanism; 9, reset assembly; 10, protection mechanism;

[0035] 71, fixed shaft; 72, movable sleeve; 73, arc baffle; 74, gear; 75, rack;

[0036] 81, support frame; 82, electromagnet; 83, control terminal; 84, magnetic absorbing piece;

[0037] 91, fixed sleeve; 92, sliding sleeve; 93, support column; 94, through hole; 95, connecting spring;

[0038] 101, load terminal; 102, spring contact; 103, sliding block; 104, fuse; 105, connecting terminal; 106, buckle. DETAILED DESCRIPTION

[0039] In order for those skilled in the art to better understand the technical solutions of the present application, the present application will be further described in detail below in combination with the drawings.

[0040] Example one

[0041] The present application provides a relay with overcurrent protection as shown in Figures 1-6 and Figure 9 The present application provides a relay with overcurrent protection as shown in

[0042] The connecting piece 2 is arranged inside the shell 1, the top and bottom of the two ends of the connecting piece 2 are provided with contacts 3, one side of the connecting piece 2 is provided with two common contacts 4 corresponding to the contacts 3, and the other side of the connecting piece 2 is provided with an upper contact 5 and a lower contact 6 corresponding to the contacts 3;

[0043] It should be noted that one end of the connecting piece 2 is located between the upper contact 5 and the lower contact 6, and the contacts 3 at one end of the connecting piece 2 can be in contact with the upper contact 5 and the lower contact 6 respectively through the up-down movement of the connecting piece 2, while the contacts 3 at the other end of the connecting piece 2 can always be in contact with one of the two common contacts 4, and the circuit switching of the common contacts 4 and the upper contact 5 and the common contacts 4 and the lower contact 6 can be realized through the up-down movement of the connecting piece 2.

[0044] Among them, the common contacts 4, the upper contact 5 and the lower contact 6 connect the load circuit, and by moving the connecting piece 2 up and down, the common contacts 4 are communicated with the upper contact 5 or the lower contact 6, realizing the switching of the load circuit.

[0045] The movable arc prevention mechanism 7 is arranged in two, and the two movable arc prevention mechanisms 7 are arranged at the two ends of the connecting piece 2 respectively, the movable arc prevention mechanism 7 includes a fixed shaft 71 fixed at the end of the connecting piece 2, a movable sleeve 72 rotationally connected with the fixed shaft 71 and an arc baffle 73, the lower of the connecting piece 2 is provided with a driving mechanism 8 corresponding to the connecting piece 2, and the top of the connecting piece 2 is provided with a reset assembly 9;

[0046] It should be noted that the arc baffle 73 can rotate around the connecting piece 2 through the movable sleeve 72 and the fixed shaft 71, so that when the contacts 3 at the end of the connecting piece 2 are in contact with the common contacts 4, the upper contact 5 or the lower contact 6, the arc baffle 73 can be rotated to the other end of the contact point, so that the arc baffle 73 will not hinder the contact of the contacts 3 with the common contacts 4, the upper contact 5 or the lower contact 6, in addition, after the contacts 3 are separated from the common contacts 4, the upper contact 5 or the lower contact 6, the arc baffle 73 can be rotated to between them, which can block the arc generated when the contact point is disconnected, avoiding damage to the circuit caused by the arc.

[0047] At the same time, by arranging the movable arc prevention mechanism 7 at the two ends of the connecting piece 2, the arc extinguishing operation can be carried out at the same time, further improving the arc extinguishing effect.

[0048] In addition, the driving mechanism 8 and the reset assembly 9 cooperate with each other, the driving mechanism 8 controls the downward movement of the connecting piece 2, and the reset assembly 9 controls the upward reset of the connecting piece 2.

[0049] A protection mechanism 10 is arranged through the shell 1 and is in sliding connection with the shell 1, and the protection mechanism 10 is connected with the common contact 4.

[0050] It should be noted that the protection mechanism 10 is mainly used for short circuit protection, and the protection mechanism 10 is in communication with the common contact 4, when the load circuit has a short circuit, overload or other faults, the protection mechanism 10 disconnects the load circuit, and avoids the electrical equipment connected with the load circuit from being damaged due to the circuit fault.

[0051] The upper contact 5 is arranged above the connecting piece 2, the lower contact 6 is arranged below the connecting piece 2, and the two common contacts 4 are arranged on the upper and lower sides of the connecting piece 2 respectively, and the two common contacts 4 correspond to the upper contact 5 and the lower contact 6 respectively.

[0052] It should be noted that the upper and lower movements of the connecting piece 2 can make the common contact 4 in communication with the upper contact 5 and the lower contact 6 respectively.

[0053] It should be noted that the upper and lower movements of the connecting piece 2 can make the common contact 4 in communication with the upper contact 5 and the lower contact 6 respectively.

[0054] The movable arc prevention mechanism 7 further comprises a gear 74 and a rack 75, the gear 74 is fixed on one side of the movable sleeve 72, the gear 74 is coaxially arranged with the movable sleeve 72, and the rack 75 is fixed in the inside of the shell 1, and the rack 75 is in engagement with the gear 74.

[0055] It should be noted that the gear 74 is connected with the connecting piece 2 through the movable sleeve 72, and can move up and down together with the connecting piece 2, when the gear 74 moves correspondingly with the rack 75, the gear 74 rotates.

[0056] When the connecting piece 2 moves the control contact 3 to disconnect the common contact 4, the upper contact 5 or the lower contact 6, the gear 74 rotates, thereby driving the movable sleeve 72 connected therewith to rotate, and the movable sleeve 72 drives the arc baffle 73 to rotate around the contact 3, the arc baffle 73 can rotate to the disconnected contact points, and can block the arc generated when the contact points are disconnected, thereby avoiding the damage to the circuit caused by the arc.

[0057] In the embodiment, the driving mechanism 8 drives the connecting piece 2 to move downward, so that the contact 3 is separated from the upper contact 5 and the lower contact 6. During the movement, the gear 74 is engaged with the rack 75, and the gear 74 is driven to rotate during the downward movement of the connecting piece 2, and then drives the movable sleeve 72 to rotate, so that the movable sleeve 72 drives the arc baffle 73 to rotate, and the arc baffle 73 located below the connecting piece 2 is rotated upward, and then shields the contact 3 separated from the lower contact 6 at the top of the connecting piece 2, so as to avoid damage to the contact 3 or the lower contact 6 caused by the electric arc generated by the disconnection of the contact.

[0058] Embodiment two

[0059] Based on the driving mechanism 8, the reset assembly 9 and the protection mechanism 10 provided in the embodiment one, the application provides further technical solutions as Figures 1-5 、 Figure 7 and Figure 8 .

[0060] The driving mechanism 8 comprises a support frame 81 fixed in the inside of the shell 1, and an electromagnet 82 installed on the support frame 81, which is arranged below the connecting piece 2.

[0061] A control terminal 83 is penetrated through the bottom of the shell 1, and is electrically connected with the coil of the electromagnet 82.

[0062] It should be noted that the control terminal 83 and the electromagnet 82 are control terminals, which are used to connect a control circuit, and the electromagnet 82 can be switched on or off by the on-off of the control circuit. The electromagnet 82 cooperates with the connecting piece 2 to control the downward movement of the connecting piece 2, so that the on-off of the load circuit is changed, and the normally closed circuit is disconnected, while the normally open circuit is closed.

[0063] The reset assembly 9 comprises a fixed sleeve 91 fixedly sleeved on the outside of the connecting piece 2, and a sliding sleeve 92 fixedly connected with the top of the fixed sleeve 91. A support column 93 is arranged in the inside of the sliding sleeve 92, and the support column 93 is in sliding connection with the sliding sleeve 92. The top end of the support column 93 is fixedly connected with the inner wall of the shell 1.

[0064] It should be noted that the support column 93 cooperates with the movable sleeve 72 to limit the connecting piece 2, so that the connecting piece 2 can move vertically up and down without turning over or tilting. The fixed sleeve 91 needs to be made of insulating material, which can effectively prevent faults such as electric leakage and short circuit.

[0065] A through hole 94 is formed in the center of the support column 93, and a connecting spring 95 is arranged in the inside of the through hole 94. The two ends of the connecting spring 95 are respectively connected with the fixed sleeve 91 and the inner wall of the shell 1.

[0066] It needs to be explained that through the setting of the connecting spring 95, the fixed sleeve 91 and the shell 1 can be connected, when the control circuit is started, under the action of the protection mechanism 10, the connecting sheet 2 moves downward, the connecting spring 95 is stretched and lengthened, and when the control circuit is turned off, the connecting spring 95 can retract to reset the connecting sheet 2.

[0067] The bottom of the fixed sleeve 91 is fixedly connected with a magnetic sheet 84, and the magnetic sheet 84 is matched with the electromagnet 82.

[0068] It needs to be explained that through the cooperation of the magnetic sheet 84 and the electromagnet 82, when the electromagnet 82 is powered on, it can attract the magnetic sheet 84 above it, thereby driving the fixed sleeve 91 connected with the magnetic sheet 84 to move downward, and in turn driving the connecting sheet 2 to move downward, while cooperating with the reset assembly 9 to automatically reset after the electromagnet 82 is powered off.

[0069] The protection mechanism 10 includes three load terminals 101 arranged inside, and the three load terminals 101 are respectively connected with the common contact 4, the upper contact 5 and the lower contact 6, and the load terminals 101 penetrate through the shell 1 and extend outside the shell 1.

[0070] It needs to be explained that through the load terminals 101 extending out of the shell 1, external load circuits can be connected;

[0071] When the external load connects the common contact 4 and the upper contact 5 through the load terminals 101, it is in a normally closed state, at this time the external load is normally powered on, and when the electromagnet 82 is started, the external load can be powered off;

[0072] When the external load connects the common contact 4 and the lower contact 6 through the load terminals 101, it is in a normally open state, at this time the external load is normally powered off, and when the electromagnet 82 is started, the external load can be powered on.

[0073] Among them, the load terminal 101 connected with the common contact 4 is interrupted in the middle, both ends of the load terminal 101 are connected with the elastic sheet contact 102, one side of the shell 1 penetrates through the sliding block 103, the sliding block 103 is slidingly connected with the shell 1, the fuse 104 is installed on the sliding block 103, both ends of the fuse 104 are connected with the connecting terminal 105, and the two connecting terminals 105 correspond to the two elastic sheet contacts 102 respectively, and the buckle 106 is arranged between the sliding block 103 and the shell 1.

[0074] It should be noted that by setting the fuse 104 in the middle of the load terminal 101, when the load current is too large, the fuse 104 will be blown, at this time the load circuit can be disconnected, avoiding the damage of the equipment in the load circuit due to the too high current, in addition, through the design of the slidable slider 103, the fuse 104 can be quickly replaced after damage.

[0075] The embodiment is specific: the control circuit is connected with the two control terminals 83 at the bottom of the relay, and the load circuit is connected with the load terminal 101 at the top of the relay according to requirements, so that the load circuit is connected with the common contact 4 and the upper contact 5 (at this time the circuit is normally closed), or the common contact 4 and the lower contact 6 (at this time the circuit is normally open);

[0076] When the control circuit is started, the electromagnet 82 can be started, so that the electromagnet 82 attracts the magnetic attraction piece 84 at the bottom of the fixed sleeve 91, and the connecting piece 2 moves downward, at this time the normally closed circuit is opened, and the normally open circuit is closed.

[0077] In addition, the protection mechanism 10 is located between the load terminal 101 and the common contact 4, when the current in the circuit exceeds the threshold value, the fuse 104 is blown, and the load circuit can be automatically disconnected to prevent damage to the equipment in the load circuit.

[0078] The working principle of the application is as follows:

[0079] Referring to the drawings in the specification Figures 1-9 First, the control circuit is connected with the two control terminals 83 at the bottom of the relay, the switch of the electromagnet 82 is controlled through the control circuit, and the load circuit is connected with the load terminal 101 at the top of the relay according to requirements.

[0080] When it is required to connect the circuit between the common contact 4 and the lower contact 6, the control circuit can be connected, the electromagnet 82 is opened, at this time the electromagnet 82 attracts the magnetic attraction piece 84 at the bottom of the fixed sleeve 91, the connecting piece 2 moves downward, the contact 3 is separated from the upper contact 5 and connected with the lower contact 6, in the process of moving, because the gear 74 is engaged with the rack 75, in the process of the connecting piece 2 moving downward, the gear 74 is driven to rotate, and then the movable sleeve 72 is driven to rotate, the movable sleeve 72 drives the arc baffle 73 to rotate, the arc baffle 73 located below the connecting piece 2 rotates upward, and then the contact 3 separated from the connecting piece 2 at the top and the lower contact 6 is shielded, avoiding the damage of the arc generated by the disconnection of the contact to the contact 3 or the lower contact 6;

[0081] When the circuit between the common contact 4 and the upper contact 5 needs to be turned on, the control circuit can be disconnected, the connecting piece 2 is closed, under the action of the connecting spring 95, the connecting piece 2 is reset upwards, the contact 3 is separated from the lower contact 6 and the upper contact 5, in the process of moving, because the gear 74 is engaged with the rack 75, in the process of the connecting piece 2 moving upwards, the gear 74 is driven to rotate, and then drives the movable sleeve 72, so that the movable sleeve 72 drives the arc baffle 73 to rotate, the arc baffle 73 above the connecting piece 2 rotates downwards, and then shields the contact 3 separated from the bottom of the connecting piece 2 and the upper contact 5;

[0082] When a short circuit, overcurrent and other faults occur in the load, the fuse 104 is fused, the load circuit can be automatically disconnected, the equipment in the load circuit is prevented from being damaged, and through the design of the slidable sliding block 103, the fuse 104 can be quickly replaced after being damaged.

[0083] The above only describes some exemplary embodiments of the application by way of illustration, and it is needless to say that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the application. Therefore, the above drawings and descriptions are illustrative in nature and should not be understood as limiting the scope of protection of the claims of the application.

Claims

1. A relay with overcurrent protection comprising a housing (1), characterized in that Also include: The connecting sheet (2) is arranged in the inside of the shell (1), the top and bottom of both ends of the connecting sheet (2) are provided with contact (3), one side of the connecting sheet (2) is provided with two common contacts (4), the common contacts (4) correspond to the contact (3), the other side of the connecting sheet (2) is provided with upper contact (5) and lower contact (6), the upper contact (5) and lower contact (6) correspond to the contact (3); The movable arc prevention mechanism (7) is arranged in two, two movable arc prevention mechanisms (7) are arranged in both ends of the connecting sheet (2), the movable arc prevention mechanism (7) includes fixed shaft (71) fixed in the end of the connecting sheet (2), movable sleeve (72) and arc baffle (73) are rotatably connected with the fixed shaft (71), the lower of the connecting sheet (2) is provided with driving mechanism (8), the driving mechanism (8) corresponds to the connecting sheet (2), the top of the connecting sheet (2) is provided with reset component (9);The movable arc prevention mechanism (7) further includes gear (74) and rack (75), the gear (74) is fixed on one side of the movable sleeve (72), the gear (74) is coaxially arranged with the movable sleeve (72), the rack (75) is fixed in the inside of the shell (1), the rack (75) is engaged with the gear (74);The driving mechanism (8) includes support frame (81), the support frame (81) is fixed in the inside of the shell (1), the support frame (81) is installed with electromagnet (82), the electromagnet (82) is arranged below the connecting sheet (2);The reset component (9) includes fixed sleeve (91), the fixed sleeve (91) is fixedly sleeved on the outside of the connecting sheet (2), the top of the fixed sleeve (91) is fixedly connected with sliding sleeve (92), the inside of the sliding sleeve (92) is provided with support column (93), the support column (93) is slidably connected with the sliding sleeve (92), the top end of the support column (93) is fixedly connected with the inner wall of the shell (1);The center of the support column (93) is provided with through hole (94), the inside of the through hole (94) is provided with connecting spring (95), both ends of the connecting spring (95) are connected with the fixed sleeve (91) and the inner wall of the shell (1) respectively;The bottom of the fixed sleeve (91) is fixedly connected with magnetic attraction sheet (84), the magnetic attraction sheet (84) is matched with the electromagnet (82) The protection mechanism (10) is through the shell (1) and is in sliding connection with the shell (1), and the protection mechanism (10) is connected with the common contact (4); the protection mechanism (10) comprises three internally arranged load terminals (101), the three load terminals (101) are respectively connected with the common contact (4), the upper contact (5) and the lower contact (6), the load terminal (101) is through the shell (1) and extends outside the shell (1); wherein the load terminal (101) connected with the common contact (4) is disconnected in the middle, the two breakpoints of the load terminal (101) are both connected with the spring contact (102), one side of the shell (1) is through the sliding block (103), the sliding block (103) is in sliding connection with the shell (1), the fuse (104) is installed on the sliding block (103), the two ends of the fuse (104) are both connected with the connecting terminal (105), the two connecting terminals (105) correspond to the two spring contacts (102) respectively, the buckle (106) is arranged between the sliding block (103) and the shell (1).

2. A relay with overcurrent protection according to claim 1, characterized in that: The upper contact (5) is arranged above the connecting sheet (2), the lower contact (6) is arranged below the connecting sheet (2), and the two common contacts (4) are arranged on the upper side and the lower side of the connecting sheet (2) respectively, and the two common contacts (4) correspond to the upper contact (5) and the lower contact (6) respectively.

3. A relay with overcurrent protection according to claim 1, characterized in that: The bottom of the shell (1) is through the control terminal (83), and the control terminal (83) is electrically connected with the coil of the electromagnet (82).

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