John T. Wilson has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
Abstract: A circuit breaker of the type having short delay and long delay tripping modules. Separate signals are provided as external outputs from the latter modules. Furthermore, inputs are provided to the latter modules for disabling the normal operation thereof. The above-mentioned breaker also includes an instantaneous tripping circuit. If the amount of overload current is sufficiently high, an instantaneous tripping operation takes place. If the overload current is relatively lower than that which would necessitate instantaneous tripping, short delay or long delay tripping will take place. If the current then continues to increase to a sufficiently high value, the circuit breaker will operate through the instantaneous tripping circuit.
Abstract: A self-powered self-contained ground fault protective device including a current monitor, an electronic circuit for amplifying the output of the current monitor, and a relay connected to the amplifying circuit and adapted to operate whenever ground fault current through the current monitor rises above a predetermined level. The current monitor, amplifying circuit, and relay are all supported and enclosed by a molded insulating housing.
Abstract: A self-powered self-contained ground fault protective device including a current monitor, an electronic circuit for amplifying the output of the current monitor, a relay connected to the amplifying circuit and adapted to operate whenever ground fault current through the current monitor rises above a predetermined level, and an interchangeable rating plug including means for activating a circuit board switch. The current monitor, amplifying circuit, and relay are all supported and enclosed by a molded insulating housing. The rating plug is inserted into a socket on the exterior of the housing.
Abstract: Self-powered apparatus for indicating the existence of a fault in any of a plurality of conductors in an multiconductor electrical distribution system. The plurality of conductors pass through the window of a closed loop core structure current transformer, and the current transformer has a power output and a signal output. The power output is connected to, and drives, fault indicating means and starting means. The starting means initiate operation of control signal translation means which are connected to the current transformer signal output. Also included are transmission means connected to the control signal translation means and to prevention means incorporated within the indicating means, and the transmission means transmit the control signal from the signal translation means to the prevention means. The indicating means are responsive to operation of the prevention means, such that only when the control signal is transmitted to the prevention means will the indicating means be allowed to operate.
Abstract: A circuit breaker including a solid-state circuit for providing regulated current to operate a holding coil for an undervoltage release mechanism. An alternating current control line feeds a full wave bridge rectifier in the control circuit to provide pulsating direct current to a reference voltage supply circuit, a current regulating circuit, and the holding coil of an undervoltage release mechanism. The current regulating circuit comprises two series connected units of an integrated circuit quad current differential operational amplifier. The output of the second unit controls the base current of a regulating transistor which is series connected to the holding coil. The reference voltage supply circuit includes a transistor connected as a variable resistor to provide operation of the circuit over a wide range of input voltages without excessive heat generation.
Abstract: A timing device utilizing a transistor and silicon controlled rectifier to provide a momentary relatively high voltage for the solenoid coil of a tripping device which is part of an undervoltage detecting and tripping circuit to thus energize the coil to allow closing of a circuit breaker which is controlled by the undervoltage device when low voltage which originally caused the circuit breaker to trip is no longer present on the line to be protected by the circuit breaker. The relatively high voltage changes to a normal value shortly thereafter.