Low-voltage distribution box with miniature circuit breaker capable of being replaced in live-line mode

Abstract

A low-voltage distribution box with a miniature circuit breaker capable of being replaced in an electrified mode comprises a box body, the box body is provided with a plurality of cable joints used for wiring, a plurality of circuit breaker bases are arranged in the box body, and the circuit breaker bases are detachably connected with circuit breakers. The modularized base is specially matched with the miniature circuit breaker for use; when a user needs to replace a burnt-out switch, or needs to replace a small-current switch with a large current; the miniature circuit breaker with the modularized base has the advantages that any connecting wire does not need to be changed and dismounted, and the miniature circuit breaker and the base do not need to be replaced wholly; when the miniature circuit breaker needs to be replaced, only the miniature circuit breaker needs to be unplugged from the base, a new miniature circuit breaker is inserted into the base for continuous use, and the miniature circuit breaker does not need to be replaced by power failure or live wire removal.

Description

Technical Field

[0001] The utility model relates to the field of low-voltage distribution boxes, in particular to a low-voltage distribution box with a live replaceable miniature circuit breaker. Background Art

[0002] At present, the production and use of a large number of household appliances have brought new experiences to people's lives, and also greatly increased the electricity consumption of each household; this will lead to insufficient capacity of the previous household switches, and there will always be overload tripping and burnt switches, so it is necessary to replace switches with larger rated current or burnt switches; general users use the miniature circuit breakers in the distribution box for fixed installation and wiring. To replace the switch, the main incoming switch must be disconnected, and then the switch wires to be replaced must be removed. After the switch is replaced, the wires are connected to the corresponding new switch in the original way; this series of operations requires very professional electricians to carry out the construction; and the electricians need to be particularly careful in the process of removing the wires to avoid touching the live incoming end of the main incoming switch, and the previous wiring must be restored. Due to the small space of the distribution box, the large number of wires, and the live main incoming line, maintenance operators are very likely to get electric shocks or connect the wrong cables, which makes it impossible to achieve convenient maintenance and safety is not guaranteed; it may even lead to safety accidents, directly causing incalculable casualties and property losses. Utility Model Content

[0003] In order to solve the above problems, the present technical solution provides a low-voltage distribution box with a miniature circuit breaker that can be replaced under power.

[0004] To achieve the above purpose, the technical solution is as follows:

[0005] A low-voltage distribution box with a live replaceable miniature circuit breaker comprises a box body, wherein the box body is provided with a plurality of cable glands for wiring, wherein a plurality of circuit breaker bases are arranged in the box body, and the circuit breaker bases are detachably connected with the circuit breakers.

[0006] In some embodiments, elastic buckles are symmetrically provided on the opening side of the circuit breaker base, the circuit breaker is provided with a snap-fitting step that cooperates with the elastic buckle, and the circuit breaker is also provided with a terminal.

[0007] In some embodiments, a transparent plate is provided on the front side of the box, and the transparent plate is provided with a handle.

[0008] In some embodiments, the box body is provided with a plurality of mounting holes.

[0009] In some embodiments, the box further includes a circuit part, which includes:

[0010] An input end, wherein the input end is provided with a circuit breaker element QF;

[0011] The circuit breaker element QF is provided with a plurality of branches and corresponding circuit breaker elements, and is connected to corresponding loads.

[0012] In some embodiments, the input end is also provided with a plurality of indicator lights via a fuse.

[0013] The beneficial effects of this application are:

[0014] The present application specifically fixes the installation of the miniature circuit breaker and adds a base for the miniature circuit breaker; this modular base is specifically used with the miniature circuit breaker; when the user needs to replace a burned-out switch, or needs to replace a large-current switch with a small-current switch; at this time, the advantage of the patent for the miniature circuit breaker with a modular base is that there is no need to change or remove any wiring, nor is there any need to replace the entire miniature circuit breaker and the base; the miniature circuit breaker only needs to be unplugged from the base and a new miniature circuit breaker inserted into the base to continue using it, without the need to shut down the power or remove the wiring under power to replace the miniature circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following briefly introduces the drawings required for describing the embodiments.

[0016] Figure 1 It is a structural schematic diagram of an embodiment of the utility model;

[0017] Figure 2 This is a schematic diagram of the circuit breaker operation of the embodiment of the utility model;

[0018] Figure 3 It is a schematic diagram of the circuit structure of an embodiment of the utility model. DETAILED DESCRIPTION

[0019] In order to make the technical problems, technical solutions and beneficial effects solved by the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0020] Please refer to Figure 1-3 As shown, a low-voltage distribution box with a miniature circuit breaker that can be replaced under power includes a box body 1, wherein the box body 1 is provided with a plurality of cable glands 2 for wiring, and a plurality of circuit breaker bases 3 are arranged inside the box body 1, and the circuit breaker bases 3 are detachably connected with circuit breakers 4.

[0021] In this embodiment, the opening side of the circuit breaker base 3 is symmetrically provided with elastic buckles 5 , the circuit breaker 4 is provided with a snap-fitting step 10 matched with the elastic buckle 5 , and the circuit breaker 4 is also provided with a terminal 6 .

[0022] In this embodiment, a transparent plate 7 is provided on the front side of the box body 1 , and a handle 8 is provided on the transparent plate 7 .

[0023] In this embodiment, the box body 1 is provided with a plurality of mounting holes 9 .

[0024] In this embodiment, the box 1 also includes a circuit part, which includes:

[0025] An input end, wherein the input end is provided with a circuit breaker element QF;

[0026] The circuit breaker element QF is provided with a plurality of branches and corresponding circuit breaker elements, and is connected to corresponding loads.

[0027] In this embodiment, the input end is also provided with a plurality of indicator lights through a fuse.

[0028] Technical solution:

[0029] It mainly includes two aspects: structural aspect and electrical aspect;

[0030] Structure: adopt the bending and welding technology of steel plate to make a wall-mounted metal box with a length*width*height of 500*200*500mm. The corresponding primary components: miniature circuit breaker, miniature circuit breaker base, surge protector SPD (FS), primary wiring terminal (JX) and neutral ground bar and other components are installed in the corresponding positions in the box according to the plane layout of the box. The primary cable wiring of the components and the wiring of the indicator light are done well, thus forming a low-voltage distribution box with a miniature circuit breaker that can be replaced under power.

[0031] There is an inner door panel inside the box to prevent maintenance personnel from accidentally touching the wires in the box; a hole is opened on the inner door panel of the box to expose the operating handle of the miniature circuit breaker; after the inner door is closed, only the handle for users to operate the switch is exposed in the distribution box, which can prevent operators from accidentally entering the live gap and increase the safety of operation; there is a movable hinge on the right side of the inner door, and the left side is fixed with 2 M6 captive screws. The advantage of this screw is that even if the screw and nut are loosened, the screw and nut will not fall off, which maximizes the convenience of opening the door and maintenance; glands for incoming and outgoing cables are installed at the top and bottom of the box, which make the cables waterproof and fixed when entering and exiting the box; there are hanging ears welded on the four corners of the distribution box, and the distribution box can be fixed to the wall or shelf by passing bolts through the hanging ears; because there are glands on the top and bottom of the distribution box, wiring can be connected from the top or bottom of the distribution box as needed;

[0032] Electrical: The primary power cable wiring inside the entire metal box is wired according to the maximum rated current of the miniature circuit breaker, that is, 16 square mm wires are used to connect the base of the miniature circuit breaker according to the primary system diagram. The current carrying capacity of the 16 square mm wire is 80A; so it is applicable to switches with a rated current of less than or equal to 80A. If it exceeds, a larger wire needs to be replaced, but the rated current of the miniature circuit breaker generally does not exceed 63A; the distribution box incoming line miniature circuit breaker QF and feeder miniature circuit breakers QF1~12 of this solution are all equipped with a base, and the base of the miniature circuit breaker is just enough to A U-shaped plastic part wraps around the miniature circuit breaker. Both ends of the U-shaped plastic part are equipped with conductive metal components that cooperate with the metal terminals on the miniature circuit breaker. The circuit breaker and the U-shaped base are electrically connected through the metal terminals. There are movable spring clips at both ends of the U-shaped plastic part. Insert the miniature circuit breaker connected to the metal terminals into the base, lock the clips to fix the miniature circuit breaker in the base and power it on. If it needs to be replaced, unlock the lock, pull out the miniature circuit breaker, install the metal terminals on the new switch, and fix it in the base according to the above steps to run normally. The base outlet of the feeder miniature circuit breaker is connected to the primary terminal. The user can directly connect the wires to the corresponding terminals, neutral row and ground row to draw power. There are holes on the neutral row and ground row, and there are rivet nuts in the holes. The user only needs to use a screwdriver to align the screws with the nuts and tighten the wire ears. There is no need to use a wrench to fix the nuts. The above solution is convenient for relevant personnel to connect wires and replace the incoming lines and feeder switches on the base to the greatest extent.

[0033] After the surge protector SPD (FS) and its protective circuit breaker QFS are connected in series, they are then connected in parallel on the outgoing side of the incoming switch, mainly to prevent lightning shocks and induced high voltages from causing insulation breakdown on the load and causing component failure and damage; the secondary circuit components of the distribution box are signal lights (HY, HG, HR) connected to the incoming side of the incoming switch, which is convenient for operators or maintenance personnel to see the energized status of each phase of the ABC phases of the incoming cable of the box when the box is closed, which is convenient for operators to quickly judge and repair faults.

[0034] The technical effect of this scheme is

[0035] The miniature circuit breaker in the distribution box adopts a matching pluggable base. If the user wants to replace a miniature circuit breaker with a different current or a burned-out one, he only needs to install the metal terminal on the new miniature circuit breaker and then replace it with the miniature circuit breaker in the base. This process does not require disconnecting the main switch, power outage, or wiring. It has greatly changed the unfavorable situation that maintenance personnel are prone to electric shock or wrong cable connection when replacing traditional fixed miniature circuit breakers, leading to safety accidents.

[0036] The above base is a U-shaped plastic part, without any exposed live conductors, and can wrap the miniature circuit breaker; the distribution box is also equipped with an inner door; there is a double layer of protection to prevent operators from accidentally entering the live gap;

[0037] The primary wire connections in the distribution box are connected to the primary wiring terminals with wires that can meet the maximum rated current of the miniature circuit breaker; and the zero and ground rows are connected with pressure rivet nuts, making the external wiring of the distribution box safer, faster and simpler for users.

[0038] The above description is only a preferred embodiment of the present application and is not intended to limit the scope of implementation of the present application. Other principles and basic structures that are the same or similar to those of the present application are within the protection scope of the present application.

Claims

1. A low-voltage distribution box with a live replaceable miniature circuit breaker, characterized in that: The invention comprises a box body (1), wherein the box body (1) is provided with a plurality of cable glands (2) for wiring, wherein a plurality of circuit breaker bases (3) are provided inside the box body (1), and the circuit breaker bases (3) are detachably connected with circuit breakers (4).

2. A low-voltage distribution box with a live replaceable miniature circuit breaker according to claim 1, characterized in that: The opening side of the circuit breaker base (3) is symmetrically provided with elastic buckles (5), the circuit breaker (4) is provided with a snap-fitting step (10) that cooperates with the elastic buckle (5), and the circuit breaker (4) is also provided with a terminal (6).

3. A low-voltage distribution box with a live replaceable miniature circuit breaker according to claim 2, characterized in that: A transparent plate (7) is provided on the front side of the box body (1), and the transparent plate (7) is provided with a handle (8).

4. A low-voltage distribution box with a live replaceable miniature circuit breaker according to claim 1, characterized in that: The box body (1) is provided with a plurality of mounting holes (9).

5. A low-voltage distribution box with a live replaceable miniature circuit breaker according to claim 1, characterized in that: The box (1) also includes a circuit part, which includes: An input end, wherein the input end is provided with a circuit breaker element QF; The circuit breaker element QF is provided with a plurality of branches and corresponding circuit breaker elements, and is connected to corresponding loads.

6. A low-voltage distribution box with a live replaceable miniature circuit breaker according to claim 5, characterized in that: The input end is also provided with a plurality of indicator lights via a fuse.

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