DFS PV and DRCBO PV: Residual current protection for photovoltaic systems

Doepke presents the DFS PV residual current circuit-breakers and the DRCBO PV RCBOs (Residual current operated circuit-breakers with integral overcurrent protection). They have been specially developed for use in photovoltaic systems and offer the highest possible level of protection.

In principle, all AC/DC sensitive residual current devices for electrical installations with a PV power supply are required by standards. Exceptions are only made if the PV inverter manufacturer specifies otherwise. Under certain conditions, the obligation to install a residual current device applies regardless of the manufacturer's specifications, for example for fire protection reasons in accordance with VDE 0100-705 in agricultural premises.

As photovoltaic systems use inverters that can cause smooth DC residual currents, residual current protection expert Doepke recommends AC/DC sensitive residual current devices for all PV systems.

The new PV versions offer the highest possible protection level, especially for use in photovoltaic systems. With a PV-optimised short-time delay, the AC/DC sensitive residual current devices are resistant to surge currents. They thus offer higher system availability due to fewer false trippings. In addition, the RCBOs provide protection against short circuits and overloads by disconnecting only the affected circuit. The special design of the devices ensures its reduced power loss. This makes them particularly energy-efficient.

DFS PV and DRCBO PV are available with a rated residual current of 100 mA and 300 mA.

The DFS PV is also available in an HD (=Heavy Duty) version for use in harsh environments. In this version, it is particularly resistant to dust, harmful gases, heat and cold.