Rittal SK 3120.200 Rack Fan Speed Controller (AC 100-230 V)

The Rittal 3120.200 rack accessory provides temperature-dependent speed control for TopTherm fan-and-filter units and air/air heat exchangers. It reduces noise and saves energy during partial-load operation by adjusting fan speed based on temperature. The unit is designed for mounting on a 35 mm support rail (EN 50 022) and is suitable for integration into standard rack cooling systems. It is white, compact (105 mm wide × 60.2 mm deep), operates on 100–230 V input voltage and has a maximum fan output of 300 W or 2 A.

Advantages

The accessory enables quieter operation and lower energy consumption through microcontroller-controlled phase crossover and temperature-dependent speed regulation. Its rail-mount design simplifies installation in rack systems, and its compact, lightweight construction (360 g) fits into existing cooling setups without significant space or weight impact.

Suitable for

Key specifications

How to use

Mount the Rittal 3120.200 on a 35 mm EN 50 022 support rail inside the rack or enclosure. Connect the accessory to the fan or heat exchanger and to an appropriate 100–230 V supply. The built-in microcontroller performs phase cross-over and regulates fan speed according to temperature; no additional user intervention is required for basic operation. Follow the equipment manufacturer’s wiring and safety instructions during installation.

Recommendations

Install the unit in a position that allows accurate temperature sensing of the cooled area and ensure secure mounting on the specified 35 mm rail. Verify compatibility with the specific TopTherm fan or heat exchanger model and observe the 300 W / 2 A maximum fan output to avoid overload.