Three-Pole Fuse Base With Resettable Switch for Low-Voltage Safety
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Solution Overview
Problem
Existing electrical safety devices in three-pole fuse bases face challenges in maintaining high safety levels while minimizing maintenance costs and adapting to different current cut-off situations, particularly in low-voltage installations, where fuses require replacement and breakers offer lower safety and inflexibility.
Innovation Solution
An electrical safety device incorporating a switch element connected in series with a fuse, a control module that measures operational parameters to adjust the switch's state, and a vacuum interrupter for high current handling, allowing remote operation and automatic resetting, thereby reducing maintenance needs and enhancing safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fuses are used to cut off excessive current, then high safety level is achieved, but maintenance costs increase due to fuse replacement
Solution Approach 1:
The patent combines a fuse with a circuit breaker in a hybrid device. The fuse provides high-current protection while the circuit breaker handles lower-current trips and can be reset, eliminating the need to replace the entire device after a trip event.
Solution Approach 2:
The protective device is segmented into two functional parts: a fuse element for high-current protection and a circuit breaker mechanism for resettable protection. This segmentation allows each component to optimize its specific function while reducing overall maintenance requirements.
2Ease of repair
If circuit breakers are used to reset after cut-off, then maintenance costs are reduced, but safety level decreases compared to fuses
Solution Approach 1:
The patent merges a fuse and circuit breaker into a single hybrid device where the fuse provides superior high-current protection and the circuit breaker provides resettable functionality, achieving both high safety and reduced maintenance.
Solution Approach 2:
The device changes the operational parameters by using the fuse for high-current protection (where it excels) and the circuit breaker for lower-current protection (where it can reset), optimizing the safety-maintenance tradeoff across different current ranges.
3Device complexity
If standard breakers are used in low-voltage installations, then device complexity is reduced, but adaptability to different current cut-off situations decreases
Solution Approach 1:
The hybrid device is designed to handle multiple current cut-off scenarios within a single device: the fuse handles high-current faults while the circuit breaker handles lower-current protection, providing universal protection across a wide range of conditions.
4Reliability
If fuses are used to physically cut off current, then safety is ensured, but operator intervention is required for reset
Solution Approach 1:
The patent combines a fuse with a circuit breaker that includes a manual reset mechanism. After a trip event, the operator can reset the circuit breaker without replacing the entire device, reducing operational complexity while maintaining safety through the fuse's high-current protection.
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 device provides a high safety level equivalent to fuses with reduced maintenance costs, flexibility in current cut-off criteria, and autonomous operation, minimizing downtime and operator intervention, while ensuring robustness and reliability in low-voltage environments.
Implementation Method 1
the use of fuses intended for blowing when the intensity of the current exceeds a threshold, thereby cutting off the passage of current
Implementation Method 2
These devices are calibrated to cut off the current under specific conditions, usually by means of bimetal strips
Implementation Method 3
a vacuum interrupter for high current handling
Data Source
Figure 1~2
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AI summary
Safety device and three-pole base. The device (1) comprising a series switch element (104) with a fuse (103), the switch (103) having an open state and a closed state; a manual actuator (105) for opening and closing the switch element (104); measuring means (106) for measuring at least one operational parameter of the device (1); and a control module (107) for performing a disabling when the operational parameter meets a predetermined condition; wherein said disabling comprises acting on the switch element (104) in order to move the switch element (104) from the closed state to the open state.