3PS790.9 B & R Automation
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The B & R Automation 3PS790.9 is a power supply from the System 2005 Controllers series with a power rating of 50 W and a supply voltage of 230 VAC. It features internal current limiting, a 6.3 A slow-blow fuse rated at 250 V, and protection against reverse polarity and overload. The device includes a 10-pin terminal block and uses a 5 x 20 mm fuse size.
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Product Description:
The 3PS790.9 is a power supply module manufactured by B & R Automation as part of the System 2005 Controllers series. Inside a System 2005 rack, the unit receives utility power and distributes the regulated low-voltage energy that controller CPUs and I/O modules require for deterministic operation. Integrating this supply within the controller cabinet shortens field wiring runs and keeps the automation system’s electrical domain consolidated. This arrangement also supports stable power delivery for processor logic, module communication, and other control functions that depend on a consistent supply.
This module is designed for a single-phase input of 230 VAC, matching common industrial mains in Europe and many global facilities. Its maximum continuous output capability is rated at 50 W, so the connected controller segments must keep their combined load within that limit. Overcurrent events are contained by internal current limiting, which folds the output back before damage can occur. Primary line protection is delivered by a 6.3 A slow-blow / 250 V fuse that tolerates the inrush current typical of capacitive power supplies while still clearing sustained faults. That cartridge follows the miniature 5 × 20 mm form factor, which is widely used in compact electrical assemblies. Downstream terminations are landed on a 10-pin terminal block, allowing separate circuits for logic and peripheral loads without shared conductors.
Additional safeguards are incorporated through reverse polarity and overload fuse protection, preventing wiring errors or excessive current draw from propagating into the controller chassis. The module uses a shared rack interface with neighboring system components, which helps maintain orderly electrical integration inside the enclosure. Mechanical dimensions, mounting rails, and signaling assignments align with the wider System 2005 Controllers platform, so the supply fits established cabinet layouts and backplane topology. This also helps keep module arrangement consistent when several control sections are installed in the same rack.
