*Dimensions: Length 40mmX width 38mm. *The main chip: operational amplifiers, transformers. *Operating voltage: DC 12V. Features: *Output: Switch output. *Current detection range: AC 0-5A. *Current detection resolution can change the resistance parameter settings. *Output over-current switch signal output. *Over-current signal is adjustable to set the critical point, set the resolution 0.2A. *With mounting holes for easy firmware installation. *Applications: AC current equipment such as motor overcurrent detection, stall protection, short circuit protection testing, demonstration teaching experiments and so on occasion, to facilitate the secondary development; suitable for different loads, including inductive load, capacitive load, resistive load testing.