MCCB Trip Crossbar Structure to Prevent Shooter Jamming
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Solution Overview
Problem
Existing trip devices in Molded Case Circuit Breakers (MCCBs) face issues with friction between the shooter and crossbar during adjustment, leading to potential jamming and arbitrary trip operations, as well as electrical interference between phases due to conductive pins.
Innovation Solution
A trip device design featuring a rotatable adjustment crossbar with a movable crossbar that slides along a fixed crossbar, minimizing friction and allowing for precise adjustment, combined with a non-conductive material configuration to prevent electrical interference between phases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the crossbar is moved during adjustment while the shooter contact portion and shooter are in contact, then the trip section can be adjusted, but friction is caused between the shooter contact portion and shooter leading to jamming
Solution Approach 1:
The crossbar is divided into a fixed crossbar and a movable crossbar. The movable crossbar can slide along the fixed crossbar to adjust the trip section, while the shooter contact portion remains in contact with the fixed crossbar. This segmentation allows adjustment without causing friction and jamming between the shooter components.
Solution Approach 2:
The movable crossbar acts as an intermediary between the adjustment mechanism and the fixed crossbar. It transfers the adjustment movement while maintaining the shooter contact portion's stable contact with the fixed crossbar, preventing direct friction between the shooter components during adjustment.
2Strength
If a pin made of conductive material is inserted into the crossbar for structural support, then the crossbar maintains mechanical integrity, but electrical interference is caused between phases
Solution Approach 1:
The crossbar is constructed using composite materials: a non-conductive base material (such as plastic or resin) combined with conductive reinforcement elements (such as metal fibers or coatings) embedded within. This composite structure provides the necessary mechanical strength and rigidity while the non-conductive base material prevents electrical interference between phases.
3Volume of moving object
If the crossbar is designed to extend along each heater for compact arrangement, then space utilization is improved, but electrical interference between phases occurs due to the conductive pin
Solution Approach 1:
The crossbar uses composite materials with non-conductive base material and embedded conductive reinforcement. This allows the crossbar to extend along the heaters for compact arrangement while preventing electrical interference between phases through the non-conductive properties of the base material.
Solution Approach 2:
The crossbar has different local properties: the base material is non-conductive to prevent electrical interference, while specific localized areas have enhanced mechanical strength through embedded reinforcement. This allows the crossbar to extend along heaters for compact design without causing phase interference.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables smooth trip section adjustment, prevents jamming, and minimizes electrical interference between phases, ensuring reliable operation during overcurrent or fault conditions.
Implementation Method 1
When an overcurrent (small current) flows into the MCCB along the heater 1130, the bimetal 1300 is curved to press a gap adjusting portion 1210 coupled to the crossbar 1200
Implementation Method 2
When a fault current (large current) flows into the MCCB along a heater 1130, electromagnetic force is generated in a magnet 1120
Data Source
AI summary
A trip device is disclosed. The trip device according to an embodiment of the present disclosure comprises an adjustment crossbar. The adjustment crossbar is in contact with or is spaced apart from a shooter and can open or close a breaker having the trip device. The adjustment crossbar is formed by coupling a fixed crossbar and a movable crossbar. The movable crossbar is slidably coupled to the fixed crossbar. The shooter is in contact with the fixed crossbar. Therefore, regardless of the movement of the movable crossbar, the contact between the shooter and the fixed crossbar can be maintained.