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The invention is a new sensor for non-intrusive power monitoring that measures current flow in a circuit breaker without modifying the breaker panel or the circuit breaker itself. The sensor consists of three main parts: an inductive pickup for sensing current from the breaker face, an inductive link designed to transmit power through the steel breaker panel door, and a passive balanced Junction Gate Field-Effect Transistor (JFET) modulator circuit for transmitting information through the inductive link. A Non-Intrusive Load Monitoring system (NILM) interfaces with the sensor and measures the frequency content of transient events in the current signals from a centralized site. This retrofit system allows the power distribution system to non-intrusively and cost-effectively monitor multiple loads from a single location, all with the use of the presented device.