Feature: 1. Each channel of the relay module is equipped with a relay LED indicator to show the switch status of the channels. 2. This is a relay that can withstand high power, and its maximum load control can be up to 30A. 3. The use of patch optocoupler isolation design makes the 4channel relay module powerful and more stable in performance. 4. Used in PLC automation equipment control, industrial control, Internet of Things control, experimental development, circuit modification. 5. Exquisite workmanship enables this relay module to work stably and accurately, and makes it a perfect substitute. Specification: Item Type: Relay Module Material: Copper Clad Laminate Module Size: Approx. 129x72x22mm/5.1 x 2.8 x 0.9in Installation Size: Approx. 124 x 67mm/4.9 x 2.6in Quiescent Current: 5mA Trigger Current: 2-4mA Trigger Mode: High/Low Level Trigger Load Current: 30A. Package List: 1 x Relay Module Note: The module power supply voltage must be DC and consistent with the working voltage of the relay.