V I S H AY I N T E R T E C H N O L O G Y, I N C . WIREWOUND RESISTORS WCR Resistors - Water-Cooled Power Resistor Water-Cooled Wirewound Resistor KEY BENEFITS • Very high power dissipation up to 2500 W at 60 °C water inlet temperature and 5 l/min • High pulse tolerance: up to 5000 W for 10 s • Non inductive option: below 250 nH APPLICATIONS • • • • Snubber and DC grading resistor for HVDC Discharge and balancing resistor Snubber resistor for drives and large drives Filter resistor RESOURCES • Datasheet: WCR - www.vishay.com/doc?32500 • For technical questions contact [email protected] • Material categorization: For definitions please see www.vishay.com/doc?99912 One of the World’s Largest Manufacturers of Discrete Semiconductors and Passive Components PRODUCT SHEET 1/2 VMN-PT0389-1311 THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000 V I S H AY I N T E R T E C H N O L O G Y, I N C . WIREWOUND RESISTORS WCR WCR www.vishay.com Vishay MCB Water-Cooled WaterWirewound Cooled Wirewound Resistor Resistor • Direct cooling without heat sink • Better power / volume ratio • Non-inductive optional • 1 WCR = 6 wirewound resistors = 5 thick film resistors • Up to 6 resistive functions on 1 WCR tube • 1 single supply for several functions (snubber and divider) • Material categorization: For definitions of compliance please see www.vishay.com/doc?99912 STANDARD ELECTRICAL SPECIFICATIONS POWER RATING (1) W RESISTANCE RANGE Ω TOLERANCE ±% WCR 30 x 250 1500 4.7 to 56K 5 WCR 38 x 250 2000 4.7 to 56K 5 WCR 38 x 300 2500 4.7 to 56K 5 GLOBAL MODEL Note (1) Water inlet temperature 60 °C with 40 % glycol, flow rate 5 l/min TECHNICAL SPECIFICATIONS PARAMETER Temperature coefficient UNIT RESISTOR CHARACTERISTICS ppm/°C 100 ppm/°C (typical) Maximum working voltage V Up to 3500 V (6600 V on specific request) Operating temperature range °C -55 to +120 GENERAL CHARACTERISTICS Core Winding Hydraulic plugs Coating Ohmic values Inductance Cooling Operating pressure Test pressure Flow CTI Index Creeping distance Clearance distance Electrical connections Revision 24-Oct-13 Resistors - Water-Cooled Power Resistor FEATURES Ceramic Ni-Cr alloy fully insulated from water Stainless steel (corrosion free) Vitreous enamel or Silicone coating (1) E12 (4.7 Ω to 56 kΩ) Non-inductive type on request Industrial or deionized water; coolant mixtures up to 60 % glycol 1 bar to 6 bars 10 bars 5 l/min to 15 l/min > 600 On request On request M3 screw and nut (other on request) Mounting Vertically (recommended) Overload 2 x Pn 10 s (θ60 °C at 5 l/min) Endurance Pressure drop 1000 cycles Pn 30 s/30 s; variation < 5 % 0.8 bar for WCR 30 mm x 250 mm; 0.25 bar for WCR 38 mm x 250 mm and WCR 38 mm x 300 mm (flow rate 10 l/min) Note For PD reason (withstand) (1) Revision: 24-Oct-13 PRODUCT Document Number: 32500 1 For technical questions, contact: [email protected] THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SHEET 2/2 SET FORTH AT www.vishay.com/doc?91000 VMN-PT0389-1311 THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000