Circuit breaker protective shutter and current transformer apparatus

Abstract From the Canadian patent

A circuit breaker protective apparatus including a safety shutter assembly housed in the cubicle of an electric switchboard and forming a diaphragm separating front and rear sections of the cubicle. One or more toroidal winding current transformers are mounted on the partition member of the safety shutter assembly which is provided with ports or pass-through holes corresponding to the insulated line terminal connectors to permit access thereto; each transformer surrounds a corresponding opening in the partition member and is magnetically linked with the respective line terminal when the circuit breaker is closed. Both the partition and safety shutter making up the shutter assembly are …