Type F DRCBO 3: State-of-the-art residual current protection

Washing machines, induction hobs, heating and thermal pumps, ballasts in LED lighting systems, plus tools such as drill hammers or circular saws: these are just some of the appliances that are used regularly – or even daily – in private households and that require special protection. For continuous speed control, many of these electrical consumers operate using single-phase frequency converters; this means that residual currents with mixed frequencies can occur if there is a fault. A reliable protection concept which is ideal for this is the new type F mixed-frequency-sensitive DRCBO 3 from Doepke, the residual current protection experts. It combines residual current protection and line protection in one device, and is state of the art. Its major advantage over a type A residual current circuit-breaker is that it not only reliably detects AC residual currents and pulsating DC residual currents, but also residual currents with mixed frequencies deviating from 50 Hz, without this having any negative effect on its function. Consequently, it is the first choice when it comes to reliably protecting electric circuits in electrical consumers with modern control systems in the event of a short circuit, an overload or residual currents.

Because it is mixed-frequency-sensitive, Doepke’s innovative product is the perfect “home switch”, since many different electrical appliances with single phase frequency converters are now used in domestic households. However, it is also ideally suited to office premises where a large number of adapters are used, or for LED lighting in residential and non-residential buildings.

Using the type F DRCBO 3, electrical systems can be divided so that in the event of a fault, only the affected part of the circuit is switched off. This makes troubleshooting easier for qualified electrical specialists, increases the system’s availability – which is a big advantage in commercial applications in particular – and therefore reduces costs. The indicator triggered by a fault current clearly shows whether the trip was due to an overcurrent or a short circuit, or whether it was caused by a residual current. This speeds up the troubleshooting process.

The Doepke type F DRCBO 3 operates independently of auxiliary voltage and so works reliably at all times. In addition, it is particularly resistant to surge currents, which may occur during storms, when certain electrical devices are switched on or in larger lighting systems with electronically controlled luminaires, for example. The DRCBO 3 is available with B and C tripping characteristics. It is equipped with a protective guard and a tri-stable snap-in slider, allowing it to be easily removed from an interconnection without having to remove the busbar.