Rocker Contact Switch for GFCI End-of-Life Detection
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Solution Overview
Problem
Conventional GFCI devices often prematurely enter an end-of-life condition when the test button is depressed quickly, causing a good device to be improperly marked as defective and requiring replacement, due to the same spring beam being used to trip and put the device into end-of-life conditions, leading to incorrect status indications.
Innovation Solution
A rocker contact switch design that uses a movable base and two distinct legs to separate the tripped and end-of-life conditions, where the first leg remains stationary during base movement to trip the device, and the second leg moves to contact a conductive member only when the button is pushed a second distance, preventing premature end-of-life designation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the test button is depressed quickly, then the spring beam contacts the diode lead before the resistor lead, but this causes the GFCI device to be incorrectly put in an end-of-life condition
Solution Approach 1:
The invention divides the single spring beam into two separate members: a first member (spring beam) that contacts the resistor lead to trip the device, and a second member (rocker contact switch leg) that contacts the diode lead to indicate end-of-life condition. This segmentation ensures that the tripping action and end-of-life indication are performed by distinct members, preventing premature end-of-life designation regardless of button depression speed.
2Device complexity
If the same spring beam is used to both trip and put the device in end-of-life condition, then the structure is simple, but the likelihood of incorrect condition indication increases
Solution Approach 1:
The invention segments the single spring beam into two distinct members: the first member (spring beam) for tripping the device by contacting the resistor lead, and the second member (rocker contact switch leg) for indicating end-of-life condition by contacting the diode lead. This segmentation increases structural complexity slightly but significantly improves reliability by eliminating the possibility of incorrect condition indication.
Solution Approach 2:
The rocker contact switch acts as an intermediary mechanism between the spring beam and the diode lead. When the first member trips the device, the rocker contact switch's base moves, which then causes the second member (leg) to move and contact the diode lead. This intermediary ensures that end-of-life indication only occurs after successful tripping, preventing premature indication.
Data Source
AI summary
A rocker contact switch for a GFCI device includes a base and first and second legs extending from the base. When the base is moved, the second leg rotates to contact a conductive member to put the GFCI device in an end of life condition. The first leg is substantially prevented from moving in response to movement of the base. A test button of the GFCI device is pushed a first distance to complete a first circuit that trips the GFCI device. The test button is pushed a second distance, which moves the base of the rocker contact switch, to complete a second circuit that puts the GFCI device in an end of life condition by moving the rocker switch base.