1733 Reader's Spreads pg1-203:document 1/27/09 4:19 PM Page 183 WF thermal fuse built-in resistors EU • Marking: Ceramic body with alpha/numeric marking • Products with lead-free terminations meet EU RoHS requirements. Pb located in glass material, electrode and resistor element is exempt per Annex 1, exemption 5 of EU directive 2005/95/EC dimensions and construction D W Type Thermal Fuse Resistor WF5N W WF7N 4.5+2-1 ød P Dimensions inches (mm) H P d (R. Lead) d (Fuse Lead) 2A: 0.6 10A: 1.0 .031 (0.8) +.079 .630±.039 .472±.039 1.38±.059 .295 -.039 +2 ) (16.0±1.0) (12±1.0) (35±1.5) (7.5 -1 WF10N Lead Wire D 1.00±.059 +.079 .512±.039 .354±.039 (25.5±1.5) .197 -.039 +2 (13.0±1.0) (9.0±1.0) 1.52±.059 (5 -1 ) (38.5±1.5) H Ceramic Case Cement ordering information New Part # WF 5N Type Style 5N 7N 10N C 8 G 100 K Terminal Surface Temperature C: SnCu Thermal Fuse Symbol See table below Resistor Material G: Glass core wire wound S: Metal oxide film Nominal Resistance 3 digits Resistance Tolerance J: ±5% K: ±10% applications and ratings Thermal Fuse Symbol 8 10 12 14 32 33 34 35 Thermal Current Cut-off Temp. Rating 129±2 (STD) 152±2 +3 188 -1 +1 226 -3 110±2 126±2 130±2 (STD) +3 146 -2 Voltage Rating 5N 7N 10N 250V 1.6 1.6 2.0 2.0 1.2 1.4 1.6 1.6 2.0 2.0 2.4 2.4 1.4 1.6 2.0 2.0 2.5 2.5 3.5 3.5 –– –– –– –– 10A 2A Resistance Range/Material Power Rating (W) Thermal Fuse Resistance Tolerance G: Glass S: Metal G: Glass S: Metal Core Oxide Core Oxide Wirewound Film Wirewound Film 1 - 100 (E24) 110 - 10k J: ±5% (E24) K: ±10% J: ±5% Maximum Working Voltage E= √ P • R Maximum Overload Voltage √ P • R • 6.25 E= * Other combination of thermal cut-off temperatures and resistance values are available on request Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before you order and/or use. 1/06/09 KOA Speer Electronics, Inc. • 199 Bolivar Drive • Bradford, PA 16701 • USA • 814-362-5536 • Fax: 814-362-8883 • www.koaspeer.com 185 circuit protection features 1733 Reader's Spreads pg1-203:document 1/27/09 4:20 PM Page 184 WF thermal fuse built-in resistors environmental applications Derating Curve 100 Percent Rated Power (%) Temp. Symbol 80 60 10˚ 40 14˚ 20 Temp. Symbol 80 60 40 35˚ 33˚ 20 12˚ 8˚ 32˚ 34˚ 0 0 -25 -20 0 25 20 75 40 60 80 89 100 100 120 -25 -20 133 147 140 160 0 25 20 40 60 68 75 91 95 105 80 100 120 140 160 Ambient Temperature (˚C) Ambient Temperature (˚C) Temperature Rise For resistors operated at an ambient temperature of 25°C or above, a power rating shall be deleted in accordance with the above rating curves. 200 PTemperature Rise (deg) circuit protection Percent Rated Power (%) 100 5N 150 7N 100 10N 50 Measuring Point 0 2 4 8 6 Load Power (W) Performance Characteristics Parameter Resistance T.C.R. Requirement Limit Typical Within specified — tolerance ±250 x 10-6/K (G) — ±300 x 10-6/K (S) Test Method 25°C +25°C/-55°C and +25°C/+125°C Overload (Short Time) ±2% ±1.8% Rated voltage x 6.25 for 5 seconds Resistance to Soldering Heat ±1% ±0.9% 350°C ± 10°C, 3.5 seconds Moisture Resistance ±5% ±4.5% 40°C, 90% - 95% RH, 500 hours, No load Load Life ±5% ±4.5% Rated voltage, 25°C, 1000 hours, 1.5 hr ON, 0.5 hr OFF cycle Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before you order and/or use. 186 5/13/08 KOA Speer Electronics, Inc. • 199 Bolivar Drive • Bradford, PA 16701 • USA • 814-362-5536 • Fax: 814-362-8883 • www.koaspeer.com