This module has two main functions. The first function is the analog signal followed by the op amp, suitable for A/D conversion. The second function is the switch signal, which can set the current limit value in advance. When the actual current value reaches the preset current value, the switch signal changes from low level to high level, and the LED indicator lights up. Easy to use. Specifications: 1. Power supply voltage: 3-5V (5V recommended) 2. Power current: 3.5mA 3. Operating temperature: -20°C to 125°C 4. Isolation voltage: 1.5kV 5. Detection current range: -100A to 100A 6. Linearity: 20mV/A 7. Limited current range: 1.5A to 100A 8. Board size: 30mm x 37mm with 4 M3 fixed mounting holes Product Specification: - Model: WCS1800 - Color: As shown - Material: Plastic + Metal Package Contents: 1 x Module Note: Light reflection and different displays may cause the color of the item in the picture to appear slightly different from the real thing. The measurement allowed error is +/- 1-3cm.