DEHN + SOHNE DEHNcombo YPV SCI combined arrester for PV systems

The DEHNcombo YPV SCI combined arrester from DEHN reliably protects PV systems from surges caused by lightning. This arrester concept combines a number of benefits for PV systems in a single device. The surge-protective device combines a type 1 lightning current arrester with a type 2 surge arrester. It incorporates the proven Y circuit with the patented SCI technology and takes up little space.

A compact, lightning current carrying combined arrester for the DC side of photovoltaic systems, it can be used without back-up fuse up to 1000 A. It has a total discharge current of 12.5 kA (10/350 μs) and a low-voltage protection level, allowing coordination with terminal equipment.

The SCI technology with a combined disconnection and short-circuiting device is the core of the DEHNcombo YPV SCI. In case of overload, the arrester is safely disconnected and the DC switching arc is extinguished, since the arrester does not feature a mere disconnector but a switching concept specifically developed for PV systems.

The devices are tailored to meet the requirements of the new CLC/FprTS 50539-12 standard and the national supplement 5 of the DIN EN 62305-3 standard. They have a short-circuit current rating Iscpv of 1000 A DC and can thus be used in both small and large-scale systems. The combined arrester is available for voltages of 600, 1000 and 1500.

With a width of only four modules, the device is compact and space saving. Nevertheless, it features an operating-current-free operating state and fault indication as well as a remote signalling contact which immediately provides information on the availability of each protective circuit.