Recessed Switch PCB Mounting in Molded Case Circuit Breakers
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Solution Overview
Problem
Conventional molded case circuit breakers (MCCBs) have limited space for accommodating accessories and electronics due to their mechanical footprint, which restricts the integration of increased functions within electronic trip units.
Innovation Solution
The implementation of recessed switch mounting on the switch printed circuit board (PCB) within the MCCB, allowing the PCB to be positioned closer to the cover, thereby increasing the pocket size and accommodating more or different accessories without altering the external mechanical footprint.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of stationary object
If the switch PCB is mounted conventionally with switches extending out of the cover, then the switch assembly is easily accessible and simple to manufacture, but the pocket size is limited and cannot accommodate more accessories
Solution Approach 1:
The switch PCB is recessed into the cover structure, nesting the switch assembly within the cover thickness rather than extending outward. This allows the pocket space to be maximized while the switch components remain accessible through openings in the cover, effectively nesting one functional element within another spatial envelope.
Solution Approach 2:
The switch PCB mounting transitions from a conventional planar arrangement where switches extend perpendicular to the cover surface, to a recessed arrangement where the PCB is positioned in a different spatial dimension within the cover thickness. This dimensional repositioning frees up external space while maintaining switch functionality.
2Area of stationary object
If the MCCB mechanical footprint is reduced to meet customer demands, then the device occupies less space, but the internal space for accessories and electronics is further constrained
Solution Approach 1:
By recessing the switch PCB into the cover structure, the invention utilizes the cover thickness dimension to house switch components, thereby freeing up the horizontal plane for larger pocket space. This allows the external footprint to be minimized while internal volume is optimized through three-dimensional spatial arrangement.
Solution Approach 2:
The cover structure is designed with differentiated local qualities: the switch PCB is recessed in specific regions to create pocket space, while other regions maintain conventional thickness for structural integrity and switch accessibility. This localized variation in cover geometry optimizes both footprint and internal space.
3Volume of stationary object
If the switch PCB is recessed closer to the cover, then increased pocket size is achieved, but the switch PCB positioning and manufacturing precision requirements increase
Solution Approach 1:
The cover is pre-formed with recessed regions and positioning features during the molding process, establishing precise locations for the switch PCB before assembly. This preliminary structuring of the cover ensures accurate PCB positioning without requiring high-precision post-molding operations or complex alignment procedures during assembly.
Data Source
AI summary
Molded case circuit breakers (MCCBs) have an MCCB body with at least one switch printed circuit board (PCB) holding between 1-4 recessed switches. The switch PCB has a bottom primary surface and an opposing top primary surface and a cover residing over the switch PCB and attached to the MCCB case body so that an outer end portion of the 1-4 switches held by the switch PCB extends through the cover.