SCT-013-000 Non-Invasive AC Current Sensor, 100A Split-Core Clamp

The SCT-013-000 is a non-invasive, split-core current transformer built for measuring AC current up to 100A without cutting or exposing any live wiring. Its split-core design means the clamp physically opens, is placed around the wire being measured, and closes again, letting it be installed on an existing circuit without disconnecting anything or working with exposed high-voltage connections, a genuine safety advantage over current sensors that require the wire to be threaded through a solid loop.

Inside the casing, a ferrite core and a fine-wire secondary winding form the actual current-sensing element, around the primary winding that is simply the wire itself passing through the clamp's opening, rated for a 13mm by 13mm maximum wire diameter. The sensor outputs a current proportional to the measured AC current through a standard 3.5mm plug connector, and a sampling resistor inside the module also provides a voltage output option depending on how the circuit reading it is designed.

Accuracy is rated with about 3% non-linearity across 10% to 120% of the sensor's rated input current, and the casing meets the UL94-V0 flame-retardant standard, a genuine safety certification relevant given the sensor sits clamped around live household or industrial wiring. Dielectric strength is rated at 6000VAC for one minute, and operating temperature spans -25C to 85C, giving it real headroom for installation in a utility closet, panel box, or similarly uncontrolled environment.

Listed applications include whole-circuit current measurement, monitoring and protection of AC motors, lighting equipment, and air compressors, reflecting its common use in both energy monitoring projects and industrial equipment protection circuits. A 1 meter cable connects the clamp to whatever reading circuit or data logger is processing the signal. Builders adding non-invasive current monitoring to an energy monitor, a home automation system, or motor protection circuit will find the SCT-013-000's clamp-on installation a straightforward way to add real current sensing without touching exposed wiring.