Rittal SK3303.518 TopTherm Blue e wall-mounted enclosure cooling unit with 0.5 kW cooling output, 115 V single-phase supply, integrated e-Comfort controller and UL Type 3R, 4 and 12 protection.
£2,596.76
The Rittal SK3303.518 is an energy-efficient TopTherm Blue e wall-mounted enclosure cooling unit designed for reliable thermal management of industrial electrical and automation enclosures. With a cooling output of 0.5 kW at L35/L35, a 115 V single-phase, 60 Hz supply and an integrated e-Comfort controller, it provides precise temperature regulation for sensitive electrical and electronic equipment.
Designed for demanding indoor and outdoor applications, the SK3303.518 carries UL Type 3R, Type 4 and Type 12 protection classifications. Its separate internal and external air circuits help prevent contaminated ambient air from entering the enclosure, while the condenser incorporates Rittal's hydrophobic RiNano coating to support efficient operation and reduce maintenance requirements.
The cooling unit features a robust sheet steel housing finished in RAL 7035 and measures 285 mm wide × 620 mm high × 298 mm deep. Blue e technology, an e-Comfort controller and compatibility with the Rittal Blue e IoT adaptor make it a practical cooling solution for modern industrial control systems requiring dependable enclosure temperature management.
Electrical enclosures containing drives, PLCs, power supplies and other electronic equipment can generate significant heat during continuous operation. The Rittal SK3303.518 uses a closed-loop refrigeration system to remove this heat while maintaining separation between the enclosure air and the surrounding environment, helping protect sensitive components from excessive temperatures and external contamination.
The integrated e-Comfort controller continuously manages enclosure temperature, while separate internal and external air circuits provide controlled heat transfer. Blue e technology and optional IoT connectivity make the unit well suited to modern automation installations where efficient cooling, temperature monitoring and dependable equipment availability are important.
| Manufacturer | Rittal |
|---|---|
| Series | TopTherm Blue e |
| Model | SK3303.518 |
| Alternative article number | 3303518 |
| Product type | Wall-mounted enclosure cooling unit |
| Cooling output L35/L35 at 60 Hz | 0.5 kW |
| Cooling output L35/L50 at 60 Hz | 0.28 kW |
| Rated operating voltage | 115 V AC |
| Phases | 1-phase |
| Frequency | 60 Hz |
| Maximum rated current | 5.7 A |
| Maximum start-up current | 11.5 A |
| Power consumption L35/L35 at 60 Hz | 0.37 kW |
| Power consumption L35/L50 at 60 Hz | 0.45 kW |
| External air circuit | 345 m³/h |
| Internal air circuit | 280 m³/h |
| Material | Sheet steel |
| Colour | RAL 7035 |
| Mounting | Wall-mounted |
| External circuit protection | IP34 |
| Internal circuit protection | IP56 |
| NEMA / UL protection | Type 3R, Type 4, Type 12 |
| Temperature control | e-Comfort controller |
| Factory temperature setting | +35 °C |
| Temperature setting range | +20 to +50 °C |
| Operating temperature range | -20 to +50 °C |
| Storage temperature range | -40 to +70 °C |
| Refrigerant | R-513A |
| Refrigerant quantity | 0.19 kg |
| Maximum permissible operating pressure | 28 bar |
| Recommended pre-fuse | 10 A |
| Dimensions (W × H × D) | 285 × 620 × 298 mm |
| Net weight | 30.5 kg |
| EAN | 4028177943681 |
| Approval | UL + C-UL listed |
The Rittal SK3303.518 is a wall-mounted enclosure cooling unit designed to remove heat from industrial electrical and automation enclosures while maintaining controlled internal temperatures.
The unit provides a cooling output of 0.5 kW at L35/L35 and 60 Hz, with an output of 0.28 kW at L35/L50.
The cooling unit operates from a 115 V AC, single-phase, 60 Hz supply and has a maximum rated current of 5.7 A.
Yes. The TopTherm Blue e SK3303.518 is designed to be suitable for outdoor siting and carries UL Type 3R, Type 4 and Type 12 protection classifications.
Yes. It has an integrated e-Comfort controller with a factory setting of +35 °C and an adjustable temperature range from +20 to +50 °C.
Rittal TopTherm Blue e cooling units combine efficient refrigeration technology, intelligent temperature control and robust enclosure protection to provide dependable thermal management for industrial automation and electrical control applications.
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2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...