Features 1、3 GEAR ADJUSTMENT: This controller supports 3 gears adjustment, switches gears according to the FFU type, and supports RS485 comm mode. 2、INDICATOR DESIGN: With FFU running, FFU fault, and comm indicator, green flashing for normal operation, red constant on for reversed wiring. 3、WITH 5A FUSE: The controller has 5A fuse inside, automatically cuts off the output when there is overcurrent, can check the load voltage and current. 4、RELAY OUTPUT: The power supply voltage of the controller is AC220V 5W, with 10A 250VAC relay output, which ensures stable and reliable operation. 5、INSTALLATION AND DISPLAY: The fan filter unit controller has a compact size, adopts 35mm rail installation, digital tube display, making it convenient and practical. Specification Item Type: FFU Controller Material: ABS Output: Relay 10A 250VAC Operating Temperature: 0-50℃ (no freezing or condensation) Indicator: Running Indicator, No Load Indicator, Comm Indicator (Red and Green) Display: 2Pcs 3 Digits Digital Tubes Default Comm Format: Baud Rate: 9600, No Parity; Data Bits: 8; Stop Bit: 1 Comm Interface: RS485, Support for 03 Read and 06 Write Instruction Installation: 35mm Rail Mount Alarm Indicator: No Load and Comm Error Indicator Gear Adjustment: 3 Gear Adjustment (1-3) Package List 1 x Controller 1 x Resistor