5A Single-Phase AC Current Sensor Module, Onboard Current Transformer

Unlike the clamp-style current sensors that wrap around an existing wire, this module takes the conductor being measured directly through its onboard current transformer, making it better suited to new-build circuits where the current path can be routed through the sensor during assembly rather than retrofitted onto an already-wired, inaccessible conductor.

Rated input current is 5A, with output current scaled down to 5mA through a 1000:1 transformation ratio, and a built-in sampling resistor converts that current output into a readable analog voltage signal without needing an external resistor added by the builder. Linear measurement range extends to 10A through a 100-ohm sampling resistor, and linearity is rated at a tight 0.2 percent with a matching 0.2 precision class rating - solid accuracy for a sensor in this size and price class.

Construction seals the transformer core in epoxy resin, protecting the windings from moisture and mechanical damage while keeping the overall unit compact at just 18 x 19 x 22mm and 8 grams. Operating temperature is rated across a wide -40 to 90C range, giving headroom well beyond typical indoor electronics use.

Builders working on a small-scale current monitoring project, a power-usage logger for a specific circuit, or any application needing to measure AC current up to roughly 10A with good linearity and a compact, in-line transformer design (rather than a clamp-around approach) will find this 5A current sensor module a precise, well-specified option for that use case.