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A short circuit protector will quickly switch off power in case of an overload or short circuit fault in order to quickly isolate or eliminate the fault. This research uses the contradictions matrix of the TRIZ innovation theory and 40 innovation principles to innovate and improve the product. The improved short circuit protection employs an optical coupler for detection, and the control circuit is triggered synchronously at the moment when a short circuit happens so as to cut off the power and sound a buzzer alarm. The response time is 14 milliseconds, which is faster than the response time (0.1 seconds) of tripping a fuse circuit breaker so as to achieve circuit protection.

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Abstract-A socket is used as a handling tool after matching with a ratchet wrench. Its main function is to handle all kinds of screws and nuts and other fastening parts, but sockets are often lost after falling down on the ground or rolling over before and after their use. This research employs TRIZ to improve the socket design. First, this research collects and analyzes literature related to socket design. Second, it then utilizes a contradiction matrix, 39 engineering parameters, and 40 invention principles in TRIZ to find the places that need to be improved and subsequently improves them. Lastly, this research changes the socket structure to reduce losses caused by falling down and rolling over.