A3 series products: the overall dimension is 32x74x78mm. It is a micro temperature controller suitable for low temperature forced air cooling refrigeration system. It has a compressor relay output, a NTC probe input and two passive digital switch inputs: one is configured as a door switch, and the other can be set through the parameter "f-02". The RS485 output allows the user to connect to a Modbus RTU compatible monitoring system for remote display. The USB port allows the user to insert a programming key (hotkey) to upload or download the parameter list.
