Electrical enclosure heater Rittal SK 3105.420, aluminium, 115 V AC, 50/60 Hz, 400 W

Rittal SK 3105.420 is an electrical enclosure heater in an aluminium housing that provides controlled heating for control and distribution cabinets. Operating from 115 V AC at 50/60 Hz with a rated heating power of 400 W, this heater is designed to maintain internal cabinet temperature above the dew point, reduce relative humidity and prevent condensation on electrical components. The unit includes a fan-assisted design to promote even heat distribution and rapid moisture control within small to medium-sized enclosures.

Advantages

The aluminium construction offers good thermal conductivity and corrosion resistance while keeping the unit lightweight. Fan-assisted air circulation improves heat transfer to internal components and helps quickly stabilise enclosure humidity. With a continuous thermal output suitable for many indoor control and distribution cabinets, the heater supports reliable operation of relays, controllers and other sensitive devices by preventing condensation and associated corrosion or short-circuits.

Suitable for

• Indoor control cabinets and distribution enclosures that require condensation prevention
• Electrical and electronic installations with limited ventilation needing temperature maintenance
• Applications where a compact, fan-assisted heater with 400 W output is appropriate

When it may not be suitable

This specific model provides 400 W of heating and is intended for indoor enclosures; it may be undersized for very large cabinets or enclosures with high heat loss. It is not designed as outdoor weatherproof heating unless installed inside a suitably rated outdoor cabinet or additional protection is provided.

Key specifications

• Housing material: aluminium
• Supply voltage: 115 V AC, 50/60 Hz
• Nominal heating power: 400 W
• Design: fan-assisted heater for improved air circulation
• Primary function: prevent condensation and regulate internal enclosure humidity

How to use

Mount the heater inside the electrical enclosure following manufacturer spacing and mounting recommendations so airflow is not obstructed. Connect the unit to a suitable 115 V AC supply and ensure the enclosure door remains closed during normal operation to maintain efficient temperature control. Use the heater in combination with thermostats or humidity controllers if specific internal setpoints are required; where available, follow local electrical codes and safety practices during installation and wiring.

What to consider before purchase

• Enclosure internal volume and heat loss to confirm that 400 W is sufficient for maintaining temperature above the dew point
• Compatibility with the supply voltage (115 V AC) and available control options such as thermostats or humidity controllers
• Whether the unit will be used in an indoor cabinet or requires additional protection for outdoor installations

Usage recommendations

For reliable condensation prevention, position the heater to promote circulation around sensitive components and combine it with a thermostat or hygrostat to avoid unnecessary energy use. Verify regular maintenance access and periodically check fan operation to ensure continued performance.