External Circuit Branch Layout for Serviceable Electrical Connection Boxes
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Solution Overview
Problem
The existing electrical connection boxes face challenges in improving the workability of attaching and detaching load-side electric wires, particularly when additional external loads are added, and in efficiently managing overcurrent protection.
Innovation Solution
The electrical connection box design includes a circuit branch component with a conductive circuit branch member and a circuit protection component, both disposed outside the frame, which interpose between the external power supply and loads, featuring detachable electrical connection structures and a fusible portion for overcurrent protection, allowing for easy attachment and detachment of load-side wires and accommodating additional loads with retrofitted circuit protection components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the circuit branch component is disposed inside the frame, then the structure is compact, but the workability of attaching and detaching load-side electric wires deteriorates
Solution Approach 1:
The circuit branch component is extracted from the interior of the frame and disposed outside the frame. This extraction resolves the contradiction by providing easy access to the load-side electric wire connection terminal, thereby improving the workability of attaching and detaching wires without compromising the compact internal structure of the frame
2Adaptability or versatility
If multiple circuit branch components are added to accommodate additional external loads, then the adaptability improves, but the device complexity and space requirements increase
Solution Approach 1:
The circuit branch component is designed with a universal structure that can accommodate multiple external loads through its electrical connection terminal. The component can selectively connect to different load-side electric wires, enabling one physical component to serve multiple functional purposes and thereby improving adaptability without proportionally increasing device complexity
3Ease of repair
If the circuit branch component is disposed outside the frame, then the accessibility for maintenance improves, but the compactness of the overall structure deteriorates
Solution Approach 1:
The electrical connection system is segmented into the frame structure and the externally disposed circuit branch component. This segmentation allows the maintenance-critical components to be positioned outside the compact frame for easy access, while the frame itself maintains its small volume. The connection terminal serves as an interface that bridges the compact internal structure with the accessible external component
Data Source
AI summary
An electrical connection box includes a circuit branch component disposed outside a frame and outside a cylinder of a cylindrical portion, in which a cylindrical wall of the cylindrical portion has an opposing wall body disposed facing the circuit branch component outside the cylinder. The circuit branch component includes a conductive circuit branch member interposed between an external power supply and an external load between a power supply-side electric wire and a load-side electric wire, and a load-side electrical connection structure that electrically connects the load-side electric wire and the circuit branch member outside the frame, and is disposed in a state where a load connection portion of the circuit branch member is exposed on a side opposite to a side of the opposing wall body (41f) outside the frame.