1 channel optocoupler relay module using a relay with normally open load ratings: AC 250V/10A, DC 30V/10A. It provides galvanic isolation and reliable switching for both AC and DC circuits. Optocoupler isolation delivers strong driving ability and stable performance, with a trigger current of 5 mA for solid, noiseimmune operation. Faulttolerant design: if the control line breaks, the relay will not move. Optical coupling isolation improves triggering reliability and stability. Indicators: green power indicator and red onechannel relay status indicator. This is a 1 Channel Isolated 12V 10A Relay Module. Each channel can be configured to level or low level trigger via a jumper. Independent control: each relay can be switched on/off by an optoisolated 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. Applications and use scenarios: Home automation: safely control lighting, fans, or other household devices with galvanic isolation from the controller. Industrial control: remotely switch pumps, solenoids, or other equipment while protecting the host controller from voltages and transients. Prototyping and education: convenient, isolated relay control for learning MCUbased control and signal interfacing. Key benefits: provides reliable, isolated relay switching with easy MCU compatibility, adjustable trigger level, and clear status indication, suitable for projects requiring safe decoupling between control logic and power circuits.