Low Profile Aluminium Low Profile Aluminium Housed Power ResistorsHoused Power Resistors WCCHB / WCDH Series *WCCHB Low profile aluminium casing / WCDH Series * Up to 1.8kW rating on heatsink ** Up toprofile 900Waluminium rating without Low casing heatsink ** Excellent pulse load performance Up to 1.8kW rating on heatsink Up tofor 900W rating without heatsink ** Ideal dynamic braking in 2 - 30kW drives * Excellent pulse load performance * High isolation voltage of 3.5kV Ideal for dynamic braking in 2 - 30kW drives *** RoHS compliant, non-flammable construction High isolation voltage of 3.5kV * RoHS compliant, non-flammable construction Electrical Data WCDH600 WCCHB110 WCDH900 WCCHB166 WCDH1300 WCCHB216 WCCHB270 WCCHB320 Power rating (on 0.5C/W heatsink) Power rating (in free air) Overload rating (5s, non-repetitive) watts watts watts Resistance range ohms TCR Resistance tolerance Dielectric withstand (50Hz AC, 60s) Insulation resistance (1kV) Ambient temperature range 600 250 5,000 650 300 4,000 900 400 8,000 2R2 - 200R 950 480 5,500 1300 550 10,000 3R3 - 250R ppm/C % kV rms ohms C 1400 600 8,000 3R3 - 300R 1600 770 10,000 4R7 390R 1800 900 12,000 5R1 470R 100 5, 10 3.5 >1G -40 to +90 Physical Data Dimensions in mm, weight in g Section types 1 2 L P H W A B C D 1 nom nom nom nom nom nom Section type Wt. 1 102 81 12.5 68 57 45 9 5.5 2 195 WCCHB110 110 98 15 76 60 53 10.5 4.8 1 220 WCDH900 145 124 12.5 68 57 45 9 5.5 2 270 WCCHB166 166 154 15 76 60 53 10.5 4.8 1 350 WCDH1300 195 174 12.5 68 57 45 9 5.5 2 365 WCCHB216 216 204 15 76 60 53 10.5 4.8 1 480 WCCHB270 270 258 15 76 60 53 10.5 4.8 1 620 WCCHB320 320 2x 154 15 76 60 53 10.5 4.8 1 790 WCDH600 H C nom B A W D Construction A wirewound element on an insulating support is held in the aluminium profile in a symmetrical manner to allow for thermal expansion during high loads. An optional internal thermostat is fitted. The housing is then filled with quartz sand, MgO or Al2O3 to spread the heat effectively and minimise surface temperature rise. The termination wires are 300mm long style 1659 PTFE cables, AWG18/16/14 in natural colour. Standard protection is IP45; IP56 is optional. General Note Welwyn Components reserves the right to make changes in product specification without notice or liability. General Note is subject to Welwyn's own test data and is considered accurate at time of print. All information TT electronics reserves the right to Limited make changes in product specification without notice or liability. Welwyn Components All information is subjectPark, to TT electronics' own data and is considered accurate time of going to print.822181 Fax: 01670 829465 Web: www.welwyn-tt.com Welwyn Electronics Bedlington, Northumberland, NE22 7AA, at England. Tel: 01670 www.bitechnologies.com www.irctt.com www.welwyn-tt.com (c) TT electronics plc 09. 11 Low Profile Aluminium Housed Power Resistors Low Profile Aluminium Housed Power Resistors WCCHB / WCDH Series WCCHB / WCDH Series Thermal and Overload Data Temperature Derating Surface Temperature Rise 500 Tem pe ra ture R ise (C ) P roportion of P ow er R ating 120% 100% 80% 60% 40% 20% 400 300 200 100 0 0% -40 -20 0 20 40 60 80 0% 100 Ambient temperature (C) 50% 100% 150% Proportion of Rated Power Repetitive Overload (120s cycle, heatsink mounted) 14 1800 12 1600 P o w e r (k W ) 10 1400 8 1300 6 950 900 650 4 600 2 0 1.0 10.0 100.0 Duration (s) General Note Welwyn Components reserves the right to make changes in product specification without notice or liability. All information General Note is subject to Welwyn's own test data and is considered accurate at time of print. TT electronics reserves the right to make changes in product specification without notice or liability. Welwyn Components Limited All information is subject Park, to TT electronics' own data and is considered accurate time of going print. 822181 Fax: 01670 829465 Web: www.welwyn-tt.com Welwyn Electronics Bedlington, Northumberland, NE22 7AA, atEngland. Tel: to 01670 www.bitechnologies.com www.irctt.com www.welwyn-tt.com (c) TT electronics plc 09. 11 Low Profile Aluminium Housed Low Profile Aluminium Housed Power Resistors Power Resistors WCCHB / WCDH Series WCCHB / WCDH Series Ordering Procedure Example: WCDH900 with IP45 protection and a 160C thermostat at 100 ohms and 5% tolerance: WCDH900A160-100RJB Type Protection degree A B IP45 IP56 Standard Thermostat option NT Temperature (C) No Thermostat 160 standard Value (use IEC62 code) Tolerance (use IEC62 code) J 5% K 10% Packing B Bulk Pack All sizes Box Standard General Note Welwyn Components reserves the right to make changes in product specification without notice or liability All information is subject to Welwyn's own test data and is considered accurate at time of print. 01/10 Welwyn Components Limited WelwynNote Electronics Park, Bedlington, Northumberland, NE22 7AA, England. Tel: 01670 822181 Fax: 01670 829465 Web: www.welwyn-tt.com General TT electronics reserves the right to make changes in product specification without notice or liability. All information is subject to TT electronics' own data and is considered accurate at time of going to print. www.bitechnologies.com www.irctt.com www.welwyn-tt.com (c) TT electronics plc 09. 11