D ATA S H E E T 300/3 OPEN WOUND SEMI ADJUSTABLE POWER WIREWOUND RESISTORS HD S E R I E S FEATURES HIGH ELEMENT WEIGHT FOR VALUE GOOD STABILITY AT HIGH OPERATING TEMPERATURES POWER RATING 200 - 750 WATTS 7 WATTAGE SIZES HIGH SHORT TERM OVERLOAD CAPACITY Tolerance Temperature coefficients typical values Power dissipation @ 25C Ratings CHARACTERISTICS Standard K ( 10%). Also available J ( 5%). Please consult ARCOL on closer tolerances. Typically less than 100ppm/C. 200 watts to 750 watts. Ratings are given for units mounted vertically in free air in an ambient temperature of 20C; the temperature rise on the surface of the tube under these conditions will be approximately 350C. Core Element Terminals Marking Electrical porcelain. Oxidised copper nickel alloy (iron free). Nickel silver. Resistance value marked on mounting feet. ELECTRICAL SPECIFICATIONS ARCOL TYPE POWER RATING @ 25C RESISTANCE RANGE OHMS ORDERING SYSTEM APPROX WEIGHT GMS TYPICAL SURFACE TEMP. RISE C/W MIN MAX STABILITY R % PER 1000 HRS HD200 200 R49 800R 3 435 1.62 HD300 300 R71 1K2 3 555 1.08 HD400 400 R93 1K66 3 725 0.82 HD450 450 1R16 2K06 3 925 0.73 HD500 500 1R18 2K09 3 920 0.65 HD600 600 1R5 2K62 3 1130 0.55 HD750 750 1R8 3K15 3 1240 0.44 H D SERIES 3 0 0 H L 2 WATTS (MAX) HEAT MOUNTING ADJUSTABLE SINK MOUNTED STYLE BAND TOLERANCE CODE R 2 NOMIMNAL VALUE () J = 5% K TOLERANCE K = 10% THREEMILESTONE INDUSTRIAL ESTATE, TRURO, CORNWALL, TR4 9LG, ENGLAND. Tel +44 (0)1872 277431, Fax +44 (0)1872 222002 http://www.arcol.co.uk E-mail sales@arcol.co.uk Page 1 of 2 OPEN WOUND SEMI ADJUSTABLE POWER WIREWOUND RESISTORS HD S E R I E S DIMENSIONS B D C E H J K N L M DIMENSIONS (MM) ARCOL TYPE B MAX C MAX D MAX E MAX H MAX J MAX K MAX L MAX M MAX N MAX HD200 9.50 22.00 3.00 41.00 68.00 25.00 41.00 155.00 173.40 6.50 HD300 9.50 22.00 3.00 41.00 68.00 25.00 41.00 209.00 226.40 6.50 HD400 9.50 22.00 3.00 41.00 68.00 25.00 41.00 259.00 275.40 6.50 HD450 9.50 22.00 3.00 41.00 68.00 25.00 41.00 311.00 326.40 6.50 HD500 9.50 22.00 3.00 47.50 101.50 25.50 51.00 259.00 281.70 6.40 HD600 9.50 22.00 3.00 47.50 101.50 25.50 51.00 311.00 332.70 6.40 HD750 9.50 22.00 3.00 47.50 101.50 25.50 51.00 362.00 382.70 6.40 A D J U S TA B L E BA N D S TYPE L (Adjustable) When an occasional adjustment is required, this type of band is most suitable since it is vibration-proof and only requires access to one side of the band to make an adjustment. The band is loosened by slackening the locknut with a box spanner. TYPE S (Fixed) This band is most suitable for units which will have the adjustable band pre-set once and will nor require further adjustment. To make an adjustment, it is necessary to have access to both sides of the band. The band is loosened by slackening the screw whilst the locknut ensures that this screw will not work loose by vibration once the band has been set to the desired value. THREEMILESTONE INDUSTRIAL ESTATE, TRURO, CORNWALL, TR4 9LG, ENGLAND. Tel +44 (0)1872 277431 Fax +44 (0)1872 222002 http://www.arcol.co.uk E-mail sales@arcol.co.uk CERTIFICATE NUMBER FM31218 The information contained herein does not form part of a contract and is subject to change without notice. It is the responsibility of the customer to ensure that the component selected from our range is suitable for the intended application. If in doubt please ask us. Page 2 of 2