Safe protection of solar panels – with DC circuit-breakers

In addition to fuses, protection of photovoltaic modules is provided by string circuit-breakers. They protect photovoltaic modules from fault currents. For example, in large systems they prevent regeneration from intact modules to modules with a short-circuit. Their advantage over fuses is that they are immediately ready for use after a trip and when the cause of the trip has been remedied.

Moeller offers both fuse-switch disconnectors as well as string circuit-breakers. String circuit-breakers are not enclosed and intended for installation in customized generator connection enclosures. The can be combined when necessary with other components such as side-by-side terminals or overvoltage protection devices. The trip currents for the string circuit-breaker can be set over a wide range.

Disconnector with integrated short-circuit protection

The fuse-switch disconnector C10-FD for cylindrical fuse cartridges Z-C 10/SE .. PV of fuse size 10 x 38, protects photovoltaic modules against short-circuit currents. At the same time measurements can be made on the connected modules at the disconnection point.

String circuit-breaker with remote de-energization

String circuit-breakers PKZ-SOL are the fuseless alternative for the protection of photovoltaic modules against short-circuit. With their variable trip range that can be optimally adjusted to the actual short-circuit current of a string. A thermal release triggers at 1.05 … 1.3 fold current and the magnetic release at 6-fold current.

Using the optional shunt release A-PKZ0, remote switching, for example, for the fire brigade is possible. The easy to fit auxiliary switch NHI-E-PKZ0 provides switch state information.

Further information about DC String circuit-breaker ...
Product description in moeller.net

Safely master short-circuit currents up to 70 kA

Circuit-breakers NZM with thermo-magnetic overload and shortcircuit release are used for the protection of DC systems.

They can safely switch off up to 750 V at short-circuit currents of up to 70,000 A. A complete range of accessories is provided just as with the switch-disconnector N.