Features 1、Utilize Current Transformer: The module uses current transformer to collect AC signals to realize relay signal output after overcurrent in the range of 0‑5A. 2、Stable Operation: The relay is closed when there is overcurrent, and the relay is released when there is no overcurrent. 3、Overcurrent Protection: The user can use the three ports of the relay's COM, NC and NO to control the on and off of the external circuit, so as to realize the overcurrent protection function. 4、Product Parameters: Working voltage is DC12V, working current is &lt;20MA, working frequency range is 20Hz‑400Hz, output mode is switch signal output. 5、Easy To Install: The installation hole diameter is 3mm, the hole distance is 52.5mm, and the maximum detection wire diameter of the module is 5.2mm. Specification Item Type: AC Current Detection Sensor Module Working Current: <20MA Operating Frequency Range: 20Hz-400Hz Output Mode: Switch signal output Maximum Detection Wire Diameter: Approx. 5.2mm / 0.20in Mounting Hole: Hole Diameter: Approx. 3mm / 0.12in, Hole Distance: Approx. 52.5mm / 2.07in Working Environment: -40℃~+85℃, 0-95%RH Package List 1 x AC Current Detection Sensor Module