A universal extension handle cover for molded case circuit breakers from 250A to 630A

Abstract

This utility model discloses a universal molded case circuit breaker extension handle sleeve for 250A-630A circuit breakers. It includes a handle mounting part and a gripping part connected to the handle mounting part. One end of the handle mounting part has an opening for inserting the molded case circuit breaker handle, and the other end extends to a notched blocking part with a rotating shaft mounted on it. The gripping part includes a fixedly connected grip and a connecting rod, the other end of which is fixed to the rotating shaft. This utility model is 3D printed using resin material, exhibiting excellent insulation performance and reliable mechanical strength. It can be used with most 250-630A molded case circuit breakers. The combined use of the rotating shaft and the blocking part allows the handle sleeve to be used for pull-down or push-up opening and closing operations in confined spaces, as well as as a regular extended handle sleeve in conventional environments, facilitating more effortless and convenient opening and closing operations in any safe environment.

Description

Technical Field

[0001] This utility model belongs to the technical field of circuit breaker operating tools, specifically relating to a universal molded case circuit breaker extension handle sleeve for 250A-630A circuit breakers. Background Technology

[0002] During the inspection and maintenance of low-voltage electrical equipment, circuit breaker opening and closing operations are frequently required. For electrical equipment with a rated current of 630A and below, molded case circuit breakers (MCCBs) are generally chosen as the switching device. Among these, MCCBs with a rated current of 250-630A have higher spring rigidity, requiring greater force for opening and closing. Generally, a special extension handle sleeve is needed depending on the brand and model of the circuit breaker. In some factory distribution cabinets, the distance between the MCCB and the cabinet door is narrow, resulting in limited operating space and making it impossible to use a conventional handle. Applying excessive force when opening or closing these MCCBs can easily damage live parts such as the circuit breaker terminals and busbars. Applying insufficient force will result in incomplete opening or closing, causing frequent power outages to the terminal equipment and affecting its lifespan. Utility Model Content

[0003] To address the problems existing in the prior art, the purpose of this utility model is to provide a universal molded case circuit breaker extension handle sleeve that is easy to manufacture and suitable for use in confined operating spaces. This is achieved through the following technical solution: An extension handle sleeve for a universal molded case circuit breaker of 250A-630A includes a handle mounting part and a gripping part connected to the handle mounting part. One end of the handle mounting part has an opening for inserting the molded case circuit breaker handle, and the other end of the handle mounting part extends into a blocking part with a notch. A rotating shaft is mounted on the blocking part. The gripping part includes a grip and a connecting rod that are fixedly connected. The other end of the connecting rod is fixed to the rotating shaft.

[0004] Furthermore, the length, width, and depth of the opening are 32mm, 10mm, and 24mm, respectively.

[0005] Furthermore, the handle mounting part is provided with screw holes suitable for national standard M8 resin screws at the position corresponding to the opening, and the center of the screw hole is 8mm away from the outer edge of the opening.

[0006] Furthermore, the rotating shaft enables the grip to rotate, and the notched blocking part ensures that the grip rotates by no more than 110°.

[0007] Furthermore, the gripper is a hollow tubular structure, and the outer surface of the gripper is provided with protruding ridges at intervals along its length to increase friction.

[0008] Furthermore, one end of the gripper is provided with a 6*8mm hook hole.

[0009] This utility model is made of resin material by 3D printing, with excellent insulation performance and reliable mechanical strength. It can be used in most 250-630A molded case circuit breakers. The use of the rotating shaft and the blocking part allows the handle to be used for pull-down or push-up opening and closing operations in confined spaces, or as a regular extended handle in normal environments, making it easier and more convenient to perform opening and closing operations in any safe environment. Attached Figure Description

[0010] Figures 1-2 This is a schematic diagram of the structure of this utility model; In the diagram, 1-handle mounting part, 2-grip part, 3-opening, 4-notch, 5-blocking part, 6-rotating shaft, 7-grip, 8-connecting rod, 9-screw hole, 10-protruding ridge, 11-hook hole. Detailed Implementation

[0011] The present invention will be further described below with reference to the accompanying drawings to provide a better understanding of the technical solution.

[0012] like Figure 1-2 As shown, this utility model discloses a universal molded case circuit breaker extension handle sleeve for 250A-630A circuit breakers. Its main structure includes a handle mounting part 1 and a gripping part 2. The gripping part 2 is rotatably connected to the handle mounting part 1. One end of the handle mounting part 1 is provided with an opening 3 for inserting the molded case circuit breaker handle. The length, width and depth dimensions of the opening 3 are 32*10*24mm. This setting is applicable to most molded case circuit breaker handles of this current rating.

[0013] To improve the structural strength and reliability during actual operation, a blocking part 5 with a notch 4 extends from the other end of the handle mounting part 1. A rotating shaft 6 is installed on the blocking part 5. The gripping part 2 includes a fixedly connected grip 7 and a connecting rod 8. The other end of the connecting rod 8 is fixed to the rotating shaft 6. The installation of the rotating shaft 6 enables the gripping part 2 to rotate. The blocking part 5 with the notch 4 ensures that the rotation angle of the gripping part 2 is no more than 110°. This angle setting is based on the common opening and closing operation angle setting of molded case circuit breakers, so that the handle sleeve can meet the operation requirements of pushing up and pulling down in a narrow space, and can also be used as a regular handle sleeve.

[0014] In response to the problem that some molded case circuit breaker handles are relatively thin and are prone to loosening or even falling off during the fitting process with the handle sleeve, screw holes 9 suitable for national standard M8 resin screws are provided on the handle mounting part 1 at the position corresponding to the opening 3. The center of the screw hole 9 is 8mm away from the outer edge of the opening 3. When a poor fit occurs, M8 resin screws can be used for auxiliary reinforcement to prevent it from falling off during operation.

[0015] To prevent slippage during operation, raised ridges 10 are provided at intervals along the length of the outer surface of the gripper 7 to increase friction. At the same time, considering the overall weight of the handle and the feel of use, the gripper 7 is hollowed out without affecting its strength, making the gripper 7 a hollow tubular structure. In addition, for easy hanging, a 6*8mm hook hole 11 is provided at one end of the gripper 7.

Claims

1. A universal molded case circuit breaker extension handle sleeve for 250A-630A circuit breakers, characterized in that, It includes a handle mounting part (1) and a grip part (2) connected to the handle mounting part (1). One end of the handle mounting part (1) is provided with an opening (3) for inserting the handle of the molded case circuit breaker. The other end of the handle mounting part (1) extends with a blocking part (5) with a notch (4). A rotating shaft (6) is installed on the blocking part (5). The grip part (2) includes a grip (7) and a connecting rod (8) that are fixedly connected. The other end of the connecting rod (8) is fixed to the rotating shaft (6).

2. The extension handle sleeve for a universal molded case circuit breaker of 250A-630A as described in claim 1, characterized in that, The length, width, and depth of the opening (3) are 32mm, 10mm, and 24mm, respectively.

3. The extension handle sleeve for a universal molded case circuit breaker of 250A-630A as described in claim 1, characterized in that, The handle mounting part (1) is provided with a screw hole (9) suitable for national standard M8 resin screws at the position corresponding to the opening (3). The center of the screw hole (9) is 8mm away from the outer edge of the opening (3).

4. The extension handle sleeve for a universal molded case circuit breaker of 250A-630A as described in claim 1, characterized in that, The rotating shaft (6) enables the grip (2) to rotate, and the blocking part (5) with a notch (4) enables the grip (2) to rotate at an angle not greater than 110°.

5. The extension handle sleeve for a universal molded case circuit breaker of 250A-630A as described in claim 1, characterized in that, The gripper (7) is a hollow tubular structure, and the outer surface of the gripper (7) is provided with protrusions (10) at intervals along its length to increase friction.

6. The extension handle sleeve for a universal molded case circuit breaker of 250A-630A as described in claim 1, characterized in that, One end of the gripper (7) is provided with a 6*8mm hook hole (11).

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