Residual current protection for harsh environments: HD design Residual current circuit-breakers need to be absolutely reliable in all situations, even when they are used in places that are particularly hot or cold, or alternate between the two. This also applies if they are used in areas where corrosive gases or exposure to dust or similar may arise.

Doepke residual current circuit-breakers with HD (heavy duty) design are especially resistant to corrosion as a result of their construction and the special alloys used. The core component of the residual current circuit-breaker – the trip – is extremely durable and is impervious to environmental influences, while the latch is made from robust stainless steel. HD circuit-breakers can easily handle temperatures between -25 °C and 60 °C and are also unaffected by corrosive gases.

The self-protection feature of the HD residual current circuit-breaker is an integral part of its design and is therefore permanently available: 24 hours a day, 7 days a week, 365 days a year, and even when there is no power supply.

This is particularly advantageous when used in building-site distribution boards. Building-site distribution boards often go weeks or months without being used, sometimes during the winter in unheated warehouses and without a power supply. Circuit-breakers that use heaters to protect against cold temperatures, for example, are clearly at a disadvantage here.

Doepke residual current circuit-breakers in the HD design can be used in a wide range of applications, such as cold stores, the agricultural sector, ports and facilities where solvents are processed.

We currently hold the EV RCD’s in stock in HD as we feel this unit should be used for public safety in outdoor fixed point Electric Car Chargers.

HD versions are available for all DFS-series residual current circuit-breakers. Simply add ‘HD’ to the product number or designation.

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