Feature: 1. Double-sided PCB board is adopted, which has higher density, and the layout of the whole module is reasonable and beautiful. 2. The relay module has 4 channels and uses a 30A high-power relay to control the load. 3. Each channel is equipped with optocoupler isolation, which has strong anti-interference ability. 4. Each channel is provided with a relay switch LED indicating that the on and off is clearly visible. 5. The relay module is often used in automated control circuits, and plays the role of automatic adjustment, safety protection, and conversion circuit. Specification: Item Type: Relay Module Quiescent Current: 5mA Maximum Working Current: 90mA/80mA/50mA Trigger Mode: Low level/high level Load Voltage: DC30A or AC250V Load Current: 30A Trigger Voltage Range: 5V Low Level Trigger Module: 0-2VDC relay is connected (ON), 3-5VDC relay is disconnected (OFF) 12V Low Level Trigger Module: 0-5VDC relay is connected (ON), 6-12VDC relay is disconnected (OFF) 24V Low Level Trigger Module: 0-12VDC relay is connected (ON), 13-24VDC relay is disconnected (OFF) 5V High Level Trigger Module: 3.3-5VDC relay is connected (ON), 0-2.5VDC relay is disconnected (OFF) 12V High Level Trigger Module: 6-12VDC relay is connected (ON), 0-5.5VDC relay is disconnected (OFF) 24V High Level Trigger Module: 12-24VDC relay is connected (ON), 0-8.5VDC relay is disconnected (OFF). Package List: 1 x Relay Module Note: Do not exceed the voltage range, otherwise it will cause the product to burn out.