MineWATCH - Power Supplies & Relays
MineWATCH - Model PS21-B - Uninterruptible Power Supply for Hazardous Environments
The MineWATCH PS21-B from Davis Derby Ltd is an advanced uninterruptible power supply unit designed to provide reliable power continuity in demanding environments. This unit builds upon the MineWATCH PS21, featuring an 8Ah battery pack to ensure uninterrupted power delivery. Its robust construction includes a cast steel flameproof enclosure, housing the main transformer and Minewatch PC21-R relays, with six FLP entries for supply and control cables, enhancing safety in hazardous conditions. The PS21-B offers a regulated 12V dc output, maintaining a minimum of 11.5V under full load conditions, up to 700mA, for 8 hours. It includes an intrinsically safe battery enclosure made of sheet steel, as well as an intrinsically safe terminal chamber for connecting to controllers or sensors. This power supply unit can be directly connected to the Minewatch PC21 controller, forming a composite unit, and features an opto output for safe transition indication between mains and battery power in intrinsically safe setups.
