This is a very normal and simple relay switch. MCU could not directly control home device, because MCU only operates at low power - 5V, but home device operates at high voltage - 110V- 220V. Relay is the best solution to control the high voltage device with MCU. Here for this module, there is one side to connect with MCU, and other side to connect high voltage device with the terminals. Just need to use MCU's Digital pin to send a high level to module, the high voltage terminals will turn on, otherwise it will turn off.
- Turn on at high level, turn off at low level.
- Operation Voltage: 5V
- Max. power can be connected: 10A @250VAC, 15A @125VAC
- Dimension: 17.2x43.1x16.4(h)mm