Circuit Breaker Reset Lockout With Single-Actuator Fault Reset
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Solution Overview
Problem
Existing circuit breakers face challenges in effectively integrating reset lockout mechanisms with single actuators, such as rocker actuators, to provide reliable fault protection and reset functionality.
Innovation Solution
A circuit breaker design incorporating a single actuator, a latch arm, a linkage mechanism, and circuitry that enables selective electrical communication between line and load terminals, with a reset lockout mechanism to prevent reestablishment of the conductive path during fault conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a reset lockout mechanism is integrated with a single actuator in circuit breakers, then device complexity is reduced and ease of operation is improved, but reliability may worsen if the integration is not properly designed
Solution Approach 1:
The single actuator (rocker) is designed to perform multiple functions: it serves as the user interface for manual operation, as part of the trip mechanism for fault detection, and as an integral component of the reset lockout system. The linkage mechanism similarly serves multiple functions by connecting the latch arm to both the actuator and the circuitry, enabling mechanical and electrical integration
2Ease of operation
If the circuit breaker uses a single actuator with integrated reset lockout mechanism, then ease of operation is improved, but the difficulty of detecting and measuring fault conditions may worsen
Solution Approach 1:
The linkage mechanism serves as an intermediary component that translates the mechanical position of the latch arm (controlled by the rocker actuator) into electrical signals for the circuitry. This intermediary mechanism enables the circuitry to detect fault conditions by monitoring the mechanical state of the actuator assembly through the linkage, bridging the mechanical and electrical domains
3Ease of manufacture
If the latch arm and linkage mechanism are operably coupled to the single actuator, then the device achieves compact integration improving ease of manufacture, but the precision of mechanical engagement may worsen
Solution Approach 1:
The reset lockout mechanism is segmented into distinct functional components: the latch arm with its proximal and distal portions, the linkage mechanism with separate linkages, and the circuitry. Each component is designed and manufactured separately with standardized interfaces, allowing for modular assembly while maintaining precise mechanical engagement through defined coupling points and geometric constraints
Data Source
AI summary
Multi-pole and single-pole circuit breakers include a housing and a reset lockout mechanism disposed within the housing. The reset lockout mechanism disables electrical communication between line and load terminals of the circuit breaker if a predefined condition exists. Some circuit breakers include a single actuator, transition between ON and OFF states, and are capable of performing test functions. The test functions may involve testing AFCI and/or GFCI functions of the circuit breakers. The test functions may be performed when the circuit breaker transitions from an OFF state to an ON state. Some circuit breakers including a reset lockout mechanism may be powered only on its line side. Some circuit breakers provide an electrical indication when they are in the OFF state.