Electric shock prevention residual current circuit breakers provide electrical shock protection before contact of any current. The circuit breaker eliminating the flaws of the concurrent residual current circuit breakers comprises a digital logic microcontroller, a fault sensor circuit, an electromagnetic trip circuit, a low voltage supply circuit, a ground line circuit, and a set of corresponding members, such as a close or open circuit assembly, an input terminal, an output terminal, a switch handle, an overcurrent and short circuit trip device, a dynamic contact, a static contact, an avoiding arc device, a leakage detecting circuit, and a housing unit.

The present invention relates generally to an electric shock prevention residual current circuit breaker. More particularly, the present invention relates to a no-current-contact electric shock prevention residual current circuit breaker that is controlled by a digital logic microcontroller and can protect against current leakage, overcurrent and short circuit. In addition, this no-current-contact electric shock prevention residual current circuit breaker is designed to provide new, intelligent protection and protection in advance of actual contact with an electric current, against electrical accidents such as electric shock and electrical fire that may likely lead to bodily injuries and fatalities, and that are caused by disconnected ground lines (due to loose or broken connections) under a controlled circuit, and by a hot ground line or a hot neutral line, a neutral line misconnected with the phase lines, a single phase misconnected with the two phases, and over voltage, and it can essentially eliminate indirect electric shocks to persons and electrical fires.

In comparison with similar models of current residual current circuit breakers in the world, the present invention consumes less power, has a slightly higher manufacturing cost, but is no larger in size.

The current residual current circuit breaker was put into use half a century ago, and it has been brought into the high-tech era through continuous improvement in its structure and breaking capacity. However, its main functions are still imperfect and its flaws include that it is not able to provide protection from a variety of electric shocks that can likely occur to a person from electrical accidents caused by disconnected ground lines (due to loose or broken connections) in a controlled circuit, and by hot ground line or hot neutral line, misconnected neutral lines with the phase lines, misconnected single phase with the two phases, and over-voltage, nor can it provide protection in advance against electric shocks without contacting electric current.

Protection provided against electric shocks only after contact with an electric current is an incomplete protection because the person is surely to suffer some level of injury, whether it is minor or severe.

Protection against electric shocks without contact with an electric current is an improved protection. Since no electric current passes through the body, no bodily harm is done to the person. Complete protection is certainly an improvement over incomplete protection.

The key to the present invention's intelligent protection against electric shock without contact with an electric current is the digital logic microcontroller that is original to this invention. It consumes little power, is small in size, is easy to install, and is inexpensive to produce. Therefore, compared with similar models of the current residual current circuit breakers in the world, the present invention consumes less power, is no bigger in size and has only a slightly higher manufacturing cost.

Therefore, only by designing an electric shock prevention residual current circuit breaker that can provide intelligent protection against the electrical faults caused by the "disconnected ground line, etc.," can we ensure effectiveness of grounding protection in a controlled circuit. Such a design would greatly contribute to global electrical safety, the prevention of electric shock fatalities and injuries, and electrical fires.