VTI FDP Series - Fused Distribution Panel
Wall-mounted High-speed Fused Power Distribution Unit
VTI's Fused Distribution Panel (FDP) is designed to provide electrical power distribution in applications requiring high-speed clearing of branch-circuit load faults from the supply source. The FDP is available for single-phase and three-phase input voltages and can accomodate single, double, or three pole switches, up to 42 pole positions per unit (or more by special order). Each branch switch output feeds a high-speed, sub-cycle clearing fuse which in turn feeds the load.
The VTI Fused Distribution Panel is supplied with UL or CUL labels. They are engineered, assembled and tested at our factory to your specifications, and then are shipped to the customer's site ready for installation. The net result is a completely self-contained, easy to order, and easy to install fused power distribution panel meeting OSHA and NEC electrical standards.
Product News Bulletin
Change to Panelboard Configuration
Sep 29 2008
VTI standardized on using Square D panelboards in our Unitized Distribution Substations (UDSs) and the Fused Distribution Panels (FDPs) back in the 1980s. Please be advised that Square D is discontinuing the type NQOD panelboard. The new panelboard will be Square D’s type NQ.
The type NQ panelboard is functionally interchangeable with NQOD and will use all of the same branch circuit breakers. The most significant change in the new type NQ panelboard is the number of pole spaces available on the 100 amp single phase and the 100 amp 3 phase panelboards. Square D is offering only 18 circuits and 30 circuits in the 100 amp configuration of the NQ panelboard.
For VTI products this change will only affect the Fused Distribution Panels. The 20 circuit single phase FDP and the 24 circuit 3 phase FDPs will no longer be available. Both the single phase and the 3 phase panelboards will now be 18 circuits. If 18 circuits are insufficient for your requirements then use the 30 circuit panelboard and VTI will only populate the number of circuits you require.
Please contact VTI if you need clarification or have any questions.
Typical applications include power distribution from an uninterruptable power supply, where standard thermomagnetic breakers are too slow to coordinate with the automatic transfer bypass circuit in a UPS. During a branch circuit fault, the UPS transfers back to the utility source to clear the fault. After the fault is cleared, the UPS transfers back to the UPS output. This transfer takes place because the UPS has limited short circuit capacity and cannot produce enough short circuit current to cause an ordinary branch breaker to reach its instantaneous trip level. On occasion you can drop the load during the transfer cycle or worse case, have the UPS transfer to the utility voltage source that is not there. The solution is to incorporate the Fused Distribution Panel (FDP) into your system network. Select the proper high-speed fuse with appropriate clearing time curve and current rating (from 0.1A to 30A).
The FDP is also useful for power distrubution to multiple small electrical loads such as electronic instruments, where fuses can be sized down to 0.1Amps for precise load protection for sensitive instruments. This offers an advantage over a standard panelboard where the smallest breaker is 10 Amps).
The FDP-DC is also available for DC power applications.
Fused Distribution Panels can use either a molded case circuit breaker (MB Series) or a fused disconnect switch (FD Series) as the main secondary protection device. The FDP is also available with a Main Lug Only disconnect option (MLO Series).
Optional neon indicator lights on each output will indicate blown fuses.
All of our fused power distribution panels can be configured from the following options:
Number of Poles and Main Disconnect Current Rating:
DocumentsThe following materials are available:
VTI can custom build FDP units to your requirements for type and number of fuses, circuit breaker ratings, and input power. We recommend our online FDP Design Guide, which will allow you to configure FDP units to your specific needs, and automatically generate a Quotation for one or more units, including pricing. Registration for this service is easy and free, and includes access to Design Guides for our other products as well.
You are also welcome to contact VTI directly via email or phone with questions or to discuss specific requirements or to order FDP units.
FDP Model Number Construction Guide
VTI uses a systematic method to construct descriptive Model Numbers for the Fused Distribution Panel. These model numbers include complete specifications on any unit and are suitable for inclusion in your Request for Quote, Project Plan or other documents. To build a model number for a Fused Distribution Panel, please use the following guide:
where the components of the model number include:
30 circuit MLO panels are available in 100A or 225A Main Bus
18 circuit MLO panels are available in 100A Main Bus only
42 circuit MLO panels are available in 225A Main Bus only
Panel Schedule: To complete any order, please provide a panel schedule to specify the Amp rating and number of Circuit Breakers and Fuses. One can be downloaded from this page under the "Documents" section above.
Please note that our online Fused Distribution Panel Design Guide will automatically generate model numbers for you, as well as provide a written Quotation for any number of units, including pricing. You are welcome to Register for VTI Technical Services now to use this service. You will then have access to the FDP Design Guide as well as Design Guides for other products.