This unit is a relay module with built-in CPU, and by simply connecting the unit to the external DC power source, it changes the direction of the drive current flow to the Peltier module in response to the signal of heating/cooling control (SSR drive voltage output) from the temperature controller.
The external DC power source (for this relay and Peltier module drive) is separately needed.
Maximum load current: 16A (Ambient temperature 0 to 50 ℃)