NH Fuse Disconnector Locking Assembly Without Power Shutdown
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Solution Overview
Problem
Existing locking accessories for NH-type fuse disconnectors require disassembly and power shutdown for installation, compromising safety and violating IP3X protection standards.
Innovation Solution
A locking accessory design that allows installation without disassembling the fuse holder, featuring a passage in the cover for inserting and aligning with a coupling zone on the base, enabling secure locking without power shutdown and maintaining IP3X protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the locking accessory is installed by opening and disassembling the fuse holder, then the locking accessory can be securely connected to the base, but the power supply must be disconnected which compromises safety and reduces productivity
Solution Approach 1:
The locking accessory is designed with a coupling portion that can be connected to the base before the fuse holder is assembled. The base includes a coupling zone with coupling elements that engage with the locking accessory's coupling portion, allowing the locking mechanism to be installed in advance without requiring disassembly of the fuse holder during powered operation
Solution Approach 2:
The coupling portion acts as an intermediary element between the base and the locking accessory. It includes coupling elements that interface with the base's coupling zone, enabling secure attachment without requiring direct access to the base interior or disassembly of the fuse holder cover
2Ease of operation
If the locking accessory is installed by creating holes in the fuse holder cover, then the locking portion can protrude for padlock attachment, but the installation becomes particularly tedious and complex
Solution Approach 1:
The locking portion is extracted from the fuse holder cover assembly process. Instead of being integrated into the cover requiring hole creation, the locking portion is a separate component that attaches to the base through the coupling portion, eliminating the need to modify the fuse holder cover with holes
Solution Approach 2:
The locking accessory is segmented into distinct functional portions: the coupling portion that attaches to the base, and the locking portion that provides padlock attachment. This segmentation allows each portion to be optimized independently and simplifies installation by eliminating the need to modify the fuse holder cover
3Ease of operation
If the locking accessory is removed from the electrical switching equipment, then the fuse holder cover can be accessed, but the IP3X protection standard is no longer met creating safety risks
Solution Approach 1:
The locking accessory design allows the fuse holder cover to maintain its protective function while the locking mechanism remains effective. The coupling portion connects to the base rather than requiring modifications to the cover, allowing the cover to remain intact and maintain IP3X protection when the locking accessory is properly installed
Data Source
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AI summary
Assembly comprising an electrical switching device of the NH fuse disconnector type and a locking accessory. The invention relates to an assembly comprising an electrical switching device (1) comprising a fuse holder (5) comprising a cover (6), a base (9), the fuse holder (5) being movable relative to the base (9) between a so-called closed contact position (PON) and a so-called open contact position, and a locking accessory (2) comprising a coupling portion (3) and a padlocking portion (4) characterized in that said cover (6) comprises a passage (11) arranged to allow said locking accessory (2) to pass through said cover (6) in a direction of movement in an insertion direction, said passage (11) and said coupling zone being substantially aligned in the so-called closed contact position (PON) and in the so-called open contact position.said locking accessory (2) is removable from said electrical switching device (1) and is configured to, in the coupling position (PC), pass through said passage (11) so that the coupling portion (3) is mechanically connected with said coupling area and that the locking portion (4) is at least partially protruding from the cover (6).