Pepperl+Fuchs UPR-03 Universal Power Rail, 3 Conductors, 2 m

UPR-03 Universal Power Rail for K-System isolators

The UPR-03 is a 2 metre section of 35 mm DIN mounting rail with a three-conductor insert, supplied with end caps and a cover. It distributes 24 V DC to all K-System modules that are clipped onto it and carries a collective error signal on the third conductor. The rail eliminates the daisy-chained supply wiring that otherwise has to be added to every module in a row.

Seven Star LLC supplies the UPR-03 in Oman and the GCC as an independent supplier in Muscat. This page lists the components, ratings and design rules.

What UPR-03 consists of

The UPR-03 is the type designation of the Universal Power Rail with end caps and cover, 3 conductors, length 2 m. The datasheet describes the Power Rail as a DIN mounting rail UPR-MR with an insert UPR-INS-03. Two conductors carry the supply, one conductor carries the collective error message. The UPR-03 is delivered with two UPR-E end caps and a UPR-COVER cover; all components can be ordered separately.

Shorter lengths exist: the UPR-03-M is 1.6 m and the UPR-03-S is 0.8 m, as listed in the datasheets of the K-System modules. The component comes in 2 m segments and can be cut to any size.

Technical specifications of the UPR-03

How the UPR-03 simplifies wiring

Each module that is clipped on has contacts that touch the conductors of the insert. The power comes through the rail, and any module can pull the error line low in the event of a fault. The power feed module at the start of the rail, such as the KFD2-EB2, supplies the rail and converts the error line into a relay contact. This approach makes it simple to add another isolator later: just snap it on.

The datasheet advises covering open, empty segments with the supplied cover. This protects the conductors from pollution and prevents accidental contact with live parts.

Rail planning with the UPR-03

Rail current is limited to 4 A, and the supply module must be sized for the total current. For long rows, split the rail with UPR-I insulation spacers and feed each section with a power feed module. The KFD2-STC5-1, KFD2-USC-1.D, KFD2-GUT-1.D and KCD2-SR-2 are examples of modules that take their supply from the rail.

Accessories listed on the datasheet are UPR-E end caps, UPR-I insulation spacers, UPR-MR 35 mm rail in 2 m lengths (pack of 2), UPR-INS-03 insert and UPR-COVER.

Selection and ordering checklist for the UPR-03

• Number of modules and their widths to determine rail length (2 m, 1.6 m or 0.8 m)
• Total supply current vs 4 A
• Need for insulation spacers and separate feed zones
• Spare end caps and covers
• Mounting plate preparation: M4 mounting holes
• Cabinet ambient range

Mounting the UPR-03

Fix the rail to the mounting plate with M4 screws and washers, push the insert into the slot, fit the end caps and place the cover over any unused part. Cut the rail to length if necessary, taking care that the cut ends of the insert are covered by end caps.

During maintenance, check that the cover is in place after modules are removed, and that no metal swarf or dirt has fallen on exposed conductors.

Typical applications in Oman and the GCC

Rail length and module count are often decided late in a project, because instrument lists grow. Ordering the rail with one or two extra segments, and fitting the covers on empty sections, makes later expansion a matter of snapping in new modules. The rail is used in marshalling and control cabinets in oil and gas facilities, power plants and desalination plants, where several dozen isolators are installed. Reduced wiring lowers installation cost and means fewer terminals to loosen from vibration. Fault-line diagnostics make a rail installation easier to supervise than isolated modules.

Mechanical points are worth planning as well. The rail is 35 mm wide and 15 mm high, so check the mounting plate clearance and the cabinet door depth together with the module depth of 114 to 115 mm quoted in the module datasheets. Mount it with M4 screws and washers at regular intervals so that the insert is well supported and the rail does not flex when modules are removed and inserted.

Power Rail variants

From the datasheets.

Information to send with an RFQ for the UPR-03

Provide these details.

• Total length needed and the number of modules
• Total current of all modules
• Accessories: end caps, spacers, cover
• Quantity and delivery date

Documents and quotation

The manufacturer datasheet for the UPR-03 is attached on this page, so the electrical data, terminal assignment and ambient limits quoted above can be checked against the original document before an order is placed.

Seven Star LLC supplies Pepperl+Fuchs products in Oman and the GCC as an independent supplier in Muscat. Send the quantity, the signal types and the project delivery date, and we will confirm availability and lead time in a written quotation.