DC MCB

DC circuits do not provide the natural current zero-crossing point that allows for fault interruption when using AC. When a fault occurs, the arc continues to "hold" and delay in clearing the fault in order to make sure that protection will clear the fault. The DC MCB is intended to be used in applications where there needs to be reliable isolation between photovoltaic strings, battery banks and control circuits while the continuous DC load is taking place. Perfect Automation & Innovation provides these types of breakers for panels where safety and the ability to quickly clear faults have a direct impact on how long a system is available.

Breaking capacity is chosen based on the actual DC voltage and prospective fault current. Breaking capacity ensures that the arc will be contained within the breaking device. Magnetic columns were used for instant tripping for short circuit conditions. Thermal protection also provides a level of sustained overload protection and will not cause nuisance operation. There are polarity markings on the terminals to ensure proper wiring during installation.

Compact construction allows combiner boxes to hold as many circuits inside a combiner box as there are to be in the DC distribution board or others, while at the same time reducing heat accumulation. The safe methods of determining ON, OFF, or TRIP status of each circuit allow for very quickly identifying any problematic circuits when doing maintenance to ensure rapid restoration of service.

The mounting configuration allows for rapid, easy removal of the DC MCBs; therefore there is minimal downtime of critical energy systems due to broken DC MCBs.

These DC MCBs have found great success within solar photovoltaic energy generating systems, battery energy storage systems, telecommunications supply panels, and any controls that use electricity for continuous operation where safe isolation, reliable short circuit protection, and stable DC distribution across the circuit the DC MCB serves are required.