Cosel PBW Series Switch Mode Power Supplies The PBW series of switch mode power supplies (SMPS) from Cosel are a compact, lightweight solution. PBW switching power supplies feature a universal rated input of 85 V ac to 264 V ac making them a versatile solution. Features and Benefits: Harmonic attenuator Built-in overcurrent protection PFC function Parallel operation and parallel redundancy Convection cooled