Expansion of multi-circuit installations is enabled by the fact the FDB2 units are modular, additionally with internal capacity or by connection of further units, so leading to useful cost and space savings at initial installation and over the lifetime of the project.
Their development over 40 years use in this environment has led to their Network Rail approval for use with general service equipment, e.g. in cafes, adjacent offices etc. to protect against induced DC current.
Each surface mounting enclosure contains solid state electronics for stability and immunity from spurious tripping. Externally RCD test buttons and MCB toggles are fully accessible at the front panel of the enclosure.
Voltage 110/230V earth fault protection is offered at 20, 30 or 100mA overload at 10, 16, 20, 25 and 32A ratings.