The Rittal SK 3302100 is a wall-mounted cooling unit from the TopTherm series, designed for climate control in control cabinets for industrial applications. It features a total cooling capacity of 0.31 kW at 50 Hz and 0.33 kW at 60 Hz under the L35 L35 operating profile, making it suitable for small to medium-sized control cabinet installations. The unit operates on 230 V, 1~, 50/60 Hz and is made of sheet steel, painted in RAL 7035. It is designed for use in environments with an operating temperature range of 10 °C to 50 °C, with an internal temperature control range between 30 °C and 50 °C. Temperature control is managed by a basic controller, pre-set at +35 °C at the factory.

Applications
This cooling unit is designed for use in industrial control cabinets where controlled internal temperature is required to ensure the function and lifespan of electronic components. It is particularly suitable for installations operated indoors or in lightly protected outdoor areas, as the external circuit has IP 34 protection and the internal circuit has IP 54 protection. The NEMA UL Type 12 rating further enhances its suitability for industrial environments with increased dust and splash water hazards.

Features and Equipment in Detail
The unit is equipped with a condenser coated with hydrophobic RiNano technology to minimize condensation formation and simplify maintenance. Airflow rates are 310 m³/h in the external circuit and 345 m³/h in the internal circuit, ensuring efficient air circulation within the control cabinet. Cooling performance is achieved using refrigerant R-513A with a quantity of 0.11 kg, which has a Global Warming Potential (GWP) of 631. Energy efficiency is described by the Energy Efficiency Ratio (EER) of 1.07 at 50 Hz and 1.06 at 60 Hz under L35 L35 operation.

Technology Explained Simply
The cooling unit operates on the principle of an air/air heat exchanger. Heat from the control cabinet is transferred to the refrigerant via the internal circuit, where it condenses in the condenser. The heat is then dissipated to the environment via the external circuit. Air circulation is driven by integrated fans. The maximum operating voltage is 230 V, the maximum rated current is 1.6 A (50 Hz) or 1.7 A (60 Hz), and the maximum inrush current is 3 A (50 Hz) or 3.4 A (60 Hz). The rated power is 0.29 kW (50 Hz) or 0.31 kW (60 Hz) under L35 L35 operation. The permissible operating pressure limit is 25 bar.

Compatibility and Accessories
The unit features a plug-in terminal block for easy installation. The delivery includes a drilling template and mounting hardware. Available accessories include digital temperature display and control units, filter mats, condensate hoses (10 x 1.5 x 10 m and 8 x 1.5 x 10 m), aluminum metal filters, electric condensate evaporators, and start-up rollers (TS and VX). These components can be used to extend functionality or improve maintainability.

Installation and Mounting
Mounting is done on the wall of the control cabinet. The drilling template facilitates positioning of the mounting holes. The terminal block allows for quick and secure electrical connection. A fuse (10 A) must be installed in the circuit. Installation must take place in a closed control cabinet, ensuring that air intake and exhaust are unobstructed to maintain cooling performance.

Operational Advantages
The unit features a compact design (280 x 550 x 140 mm) and robust construction. The hydrophobic coating on the condenser reduces condensation formation and lowers maintenance frequency. The integrated temperature control with basic controller enables automatic regulation of cooling performance. Protection ratings IP 34 (external) and IP 54 (internal) provide sufficient protection against dust and splashing water. Storage capability at temperatures from -40 °C to 70 °C allows for flexible storage and transportation conditions.

Note on Inconsistencies
There are inconsistencies in the data regarding total cooling capacity (Source 1/4/5: 0.31 kW/0.33 kW; Source 3/6: 0.36 kW/0.38 kW) and refrigerant (Source 1/4/5: R-513A; Source 3/6: R134a). Additionally, discrepancies exist in EER values (Source 1/4/5: 1.07/1.06; Source 3/6: 1.32) and rated power (Source 1/4/5: 0.29 kW/0.31 kW; Source 3/6: 0.27 kW/0.28 kW). These inconsistencies are not reflected in the text, as the data from Sources 1, 4, and 5 are consistent and up-to-date. The data from Sources 3 and 6 are considered outdated, as they do not align with official manufacturer specifications (Sources 4/5).