WCR38X250A4701JB Vishay

WCR www.vishay.com Vishay MCB Water Cooled Wirewound Resistor FEATURES 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 (1) POWER RATING RESISTANCE RANGE TOLERANCE GLOBAL MODEL W % 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 Note (1) Water inlet temperature 60 C with 40 % glycol, flow rate 5 l/min TECHNICAL SPECIFICATIONS PARAMETER UNIT RESISTOR CHARACTERISTICS Temperature coefficient 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 Ceramic Winding Ni-Cr alloy fully insulated from water Hydraulic plugs Stainless steel (corrosion free) (1) Coating Vitreous enamel or Silicone coating Ohmic values E12 (4.7 to 56 k) Inductance Non-inductive type on request Cooling Industrial or deionized water coolant mixtures up to 60 % glycol Operating pressure 1 bar to 6 bars Test pressure 10 bars Flow 5 l/min to 15 l/min CTI Index > 600 Creeping distance On request Clearance distance On request Electrical connections M3 screw and nut (other on request) Mounting Vertically (recommended) Overload 2 x P 10 s ( at 5 l/min) n 60 C Endurance 1000 cycles P 30 s/30 s variation < 5 % n 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 Pressure drop (flow rate 10 l/min) Note (1) For PD reason (withstand) Revision: 24-Oct-13 Document Number: 32500 1 For technical questions, contact: mcbfixedresistors vishay.com 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 WCR www.vishay.com Vishay MCB DIMENSIONS in millimeters TYPE 30 x 250 38 x 250 38 x 300 Water pipe diameter 8 10 10 A 250 250 300 B + 0.5 / - 0 32 44 44 c 3.5 3.5 3.5 C 14.5 14.5 14.5 D 35 43 43 max. d1 32 40 40 E7 9 9 e8 8 8 f 3.2 3.2 3.2 F11 11 11 H 54 80 80 max. h 2 25 40 40 (1) (1) (1) K L 304 335 385 max. 30 38 38 (2) (2) (2) Q G 3/8 G 3/8 G 3/8 U 288 292 342 V20 35 35 W24 34 34 X 2 286 308 358 Weight 1 kg 1.3 kg 1.5 kg Notes (1) Creeping / clearance on request (2) Other hydraulic connections on request Revision: 24-Oct-13 Document Number: 32500 2 For technical questions, contact: mcbfixedresistors vishay.com 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