Sequential Switch Assembly Preventing Open Neutral Conditions
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Solution Overview
Problem
Existing switch systems fail to properly sequence the neutral and power connections during power source switching, leading to potential damage from high voltages being applied to appliances rated for lower voltages, and often require complex switching sequences or additional interlock constructions.
Innovation Solution
A single switch assembly with a movable actuator that ensures the neutral connection is broken before the power connection when switching from one power source to another, using geometrically different constructions for power and neutral switch contacts to prevent open neutral conditions, allowing for a simple and safe switching process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If discrete switch arrangements with separate actuators are used for power and neutral conductors, then electrical isolation between power sources can be maintained, but the switching operation becomes complex and prone to user error
Solution Approach 1:
The patent combines separate power switch and neutral switch actuators into a single integrated actuator that controls both switching operations simultaneously. This merging ensures that power and neutral connections are made or broken together, maintaining electrical isolation reliability while simplifying the user operation to a single action rather than multiple separate switching steps.
Solution Approach 2:
The switch assembly incorporates preliminary design features where the internal mechanism is pre-configured to ensure proper sequencing of power and neutral connections. The actuator mechanism is designed beforehand to automatically execute the correct switching sequence, eliminating the need for users to manually coordinate complex multi-step switching operations.
2Reliability
If proper sequencing of neutral and power connections is implemented, then open neutral conditions and high voltage damage are prevented, but additional switch interlock constructions are required
Solution Approach 1:
The patent merges the power switch and neutral switch into a single integrated switch assembly with a common actuator. This combination eliminates the need for separate interlock constructions between independent switches, as the unified design inherently ensures proper sequencing of connections while reducing overall device complexity.
Solution Approach 2:
The switch assembly employs asymmetric design in the internal mechanism where the power and neutral contacts are arranged and actuated in a specific non-symmetric sequence. This asymmetric configuration ensures that power connections are made or broken before neutral connections through the single actuator's movement path, preventing open neutral conditions without requiring additional interlock components.
3Reliability
If manual configuration of multiple switches is required during power source switching, then electrical isolation can be maintained, but the switching process becomes time-consuming and error-prone
Solution Approach 1:
The patent combines multiple manual switching operations into a single integrated actuator mechanism that simultaneously controls power and neutral connections. This merging reduces the switching process from multiple time-consuming manual steps to a single rapid operation, significantly reducing time loss while maintaining electrical isolation through the coordinated switching design.
Data Source
AI summary
A switch assembly and method of switching a load between a first power source and a second power source that maintains a desired sequencing of the making and breaking of both the neutral and power connections in response to a single user input. The switch assembly includes an actuator that is movable between a first position and a second position and a first movable element and a second movable element that are operably coupled to one another and the actuator. A positive switch contact arrangement is coupled with the first movable element and a neutral switch contact arrangement is coupled with the second movable element. The positive switch contact arrangement and the neutral switch contact arrangement comprise geometrically different constructions so that moving the actuator between the first position and the second position avoids an open neutral condition.