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New 'foldback' DC power Supply from Finder Boosts Applications

June 26, 2013

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Joining the well established 78 series of switch mode power supplies from Finder, the 78.50 now features ‘foldback’ overload protection. This has been introduced to address market demands by extending application coverage to include lead acid battery charging – not compatible with the ‘hiccup’ mode of protection featured on the rest of the range. As with the rest of the range, it shares a plethora of design features to improve both reliability and efficiency, giving control system builders a stable and dependable low voltage DC supply, up to 91% efficient, and drawing only 0.4W in standby.

This series of modular, rail mounted DC power supplies now comprises models covering outputs rated 24VDC/12W, 24VDC/36W, 24VDC/60W, 12VDC/12W and 12VDC/50W – all supporting a wide AC or DC supply range capability of respectively 100-265VAC and 140-370VDC.

Integrating the latest protection technologies, the 78 Series includes: supply overvoltage (varistor) protection, thermal protection with fast output voltage shutdown; short circuit and overload protection with ‘hiccup’ (auto-recovery) protection – except the 78.50 with ‘foldback’ overload protection. In addition, the high inrush current handling capability means the power supplies will safely tolerate loads with high current transient characteristics, such as capacitive circuits and solenoids fitted with ‘economy’ resistors.

To help minimise downtime in the event of a fault, the power supply inputs are protected by an easy access internal fuse, with an adjacent spare fuse ensuring an even more immediate fix.

Measuring only 17.5 or 70mm wide by 60mm deep, these highly compact 35mm rail mounted power supplies can also help to reduce control panel size.  Conforming to EN60950-1 and EN61204-3 norms, they are fully compliant with global EMC standards for power supply design.

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