SainSmart 4 Channel RS485 DC 12V Delay Timer Switch Adjustable Module Clock Time for Arduino can be controlled directly by a wide range of microcontrollers such as Arduino AVR PIC ARM PLC etc. It is also able to control various appliances and other equipments with large current. Relay output maximum contact is AC250V 10A and DC30V 10A Widely used for all MCU control industrial sector PLC control smart home control. Standard interface can be directly connected with microcontrollers.