Pipeline Corrosion Control

Cathodic Protection Rectifiers, Standard Line, Air Cooled by Universal Rectifiers

Created by: Pipeline Corrosion Control

Last updated 12/2025

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Description

Farwest “Standard Line” air cooled cathodic protection rectifiers, manufactured by Universal Rectifiers, are recognized as industry leading in quality, workmanship and service life. Many years of field-proven service prove their superior design. Conservative equipment ratings, controlled manufacturing techniques, plus many extra features ensure long and trouble-free operation. Typical cathodic protection applications for the air cooled rectifier line include pipelines, storage tanks, and many other non-hazardous locations where continuous duty, DC cathodic protection power is required. Air cooled cathodic protection rectifier purchasing specification Standard Rectifier Features Weatherproof to NEMA 3R Heavy duty 11-gauge, hot dip galvanized cabinet with stainless steel hardware Stainless steel, perforated ventilation screens Front and side opening doors for easy access and maintenance Heavy duty, draw-pull, stainless steel cabinet latch Slide-out equipment racks with separate transformer and stack assemblies for units over 1200 watts Heavy-duty transformer with 15% over-design for reserve capacity Standard18-step voltage control link bar taps. Additional adjustment steps can be custom ordered. Quick-change, heavy-duty knobs for changing tap link bars Air Cooled Rectifier Ordering Guide Configure a model number, like ASAI 20-20 ABCF. Positions from left to right are as follows: Position #1: Model Type A = Standard Air Cooled Line Position #2: Adjustment Type S = Standard Rectifier (Manual taps)C = Constant Current (Reactor style)D = Constant Current (Solid state)E = Constant Voltage (Solid state) P = Constant potential (solid state)I = Constant potential IR free (solid state)M = Multiple Modes (Specify Modes Required)V = Variac control Position #3: Cooling A = Air Cooled Position #4: Stack Type I = Silicon (recommended)E = Selenium (rarely used, selenium stacks age over time) Position #5: DC Output Voltage Rating List Maximum DC Voltage Desired (such as 50 for 50 volts) Position #6: DC Output Amp Rating List Maximum DC Amperage Desired (such as 25 for 25 amps) Position #7: AC Input Voltage Rating AA = 115/230 volts, 1 phase, set for 115 VACBA = 230/460 volts, 1 phase, set for 230 VACCA = 230/460 volts, 3 phase, set for 230 VACEA = 115/460 volts, 1 phase, set for 115 VACG = 115 volts, 1 phase onlyH = 230 volts, 1 phase only AB = 115/230 volts, 1 phase, set for 230 VACBB = 230/460 volts, 1 phase, set for 460 VACCB = 230/460 volts, 3 phase, set for 460 VACEB = 115/460 volts, 1 phase, set for 460 VACD = 208 volts, 3 phaseF = Specify requirements Position #8: Special Optional Features C = AC and DC arrestorsD = DC arrestorE = AC arrestorF = Filter chokeG = Communications filterH = Meter switchesI = Base mounting to standard cabinetJ = Power "ON" indicator lightK = DC failure warning lightM = DC breaker (> 100 amps) or fuseN = Powder coated cabinet (hot-dip galvanized is standard on standard air cooled models) O = Aluminum cabinet optionP = Additional voltage control link bar tapsR = 115 VAC convenience outletRR = GFCI 115 VAC outlet (Not available on all models)S = Multiple rectifiers in one case (Advise qty.)T = Anodized aluminum cabinetU = Anodized aluminum cabinet with clear coatW = RMU terminal stripX = Dead front safety panelY = ETL Certified (Not available on all models)Z = Other, specify requirements