In 1923, Hugo Stotz made history. He invented a new and innovative circuit breaker that would revolutionize the world of electrical installation and safety. A combination of a thermal and magnetic trip unit in a single device, became the “Thermal-electromagnetical circuit breaker,” that was then patented in 1924 as the first ever resettable fuse. As it could simply be screwed into usual fuse sockets, it was a huge success for the company, which has now been located in Germany for over 120 years. This revolutionary circuit breaker is able to interrupt an electrical circuit in case of overload; whereas the metal wire in previous fuses would melt when too much current flowed through it. Another key benefit to this pioneering design is that no electrician was needed to change fuses any more – even an amateur could do it and to this day, it is still the case.