The Journal of Industry and Technology

Industrial Analytical Instrumentation

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Plant engineering and maintenance

FDB13 - 400V 3 phase DC immune protection

FDB Electrical's DC immune protection technology in their top end FDB13 unit is approved by Network Rail for use in DC electrified areas for general purpose earth monitoring, RCD/RCBO overload and short circuit protection of 3 phase 400V circuits. This ensures electrical safety protection for ancillary AC equipment without the nuisance tripping associated with induced currents from nearby high level DC installations.

Protection of AC equipment with FDB13 in installations adjacent to DC electrified areas has been proven over 40 years of development. Importantly it incorporates loss of neutral indication and comes with overload and short circuit protection - features which are likely to be of interest to electrical contractors, design engineers and plant engineers working in and around rail industry installations where induced DC current may cause problems in adjacent AC lines.

FDB13 units are offered in 3 ranges - 10 to 32 amp, 40 to 63 amp and 80 to 100 amp, all available from the FDB online store. They conform to BS4293 (RCD); BSEN60898 (MCB) with IΔn: 20mA; 30mA or 100mA, and are mounted in an IP20 steel surface mounting enclosure complete with knockouts for easy installation.

For further information on FDB products and services, view website: and also FDB blog: 
Refer to page 492

FDB2 multi-way RCBO with DC immune protection

The FDB2 RCBO unit is a multi-way housed earth fault protection system which shares DC immune technology with its smaller sister unit the FDB11. FDB2 offers 2 way, 3 way and 4 way options as standard with approval by Network Rail for use in DC electrified areas where it provides general purpose earth leakage protection, including overload and short circuit protection, for AC equipment without the problems of nuisance tripping associated with DC induced currents.

FDB2 units are modular, enabling expansion of multi-circuit installations with additional 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 20mA, 30mA or 100mA overload at 10A, 16A, 20A, 25A and 32A ratings. For further information, view website:   
Refer to page 492

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