4 channel optocoupler relay module Relay capability: normally open interface supports AC 250V/10A and DC 30V/10A, allowing you to switch voltage or current loads with a single module. Isolation and drive: patch optocoupler isolation provides strong driving ability and stable performance with an input drive current of about 5 mA. Fault tolerance and reliability: fault tolerant design ensures the relay will not move if the control line breaks, and optical coupling isolation improves triggering reliability and stability. Indication: power indicator (green) and four channel status indicators (red) help you quickly verify operation. Module specification: 4 Channel Isolated 12V 10A Relay Module. Each channel can be configured to trigger on or low level via a jumper. Independent control: each relay can be switched on/off individually by an opto isolated digital input. Standard interfaces can be directly connected to microcontrollers and controlled by a wide range of MCUs including Arduino, AVR, PIC, ARM, DSP, etc. All interfaces are accessible through direct connection terminal leads for convenient wiring. Practical applications: Home automation: control lighting, fans, or outlets from a microcontroller with galvanic isolation for safety. Industrial control and testing: safely interface control circuits with mains loads while preserving isolation. Prototyping and development: easy plugandplay control with common microcontroller platforms for rapid testing and deployment.