resistors WF thermal fuse built-in resistor EU features • 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 +2 -1 4.5 Dimensions inches (mm) H P d (R. Lead) d (Fuse Lead) .630±.039 .472±.039 1.38±.059 (16.0±1.0) (12±1.0) (35±1.5) 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 ød P 2A: 0.6 10A: 1.0 .031 (0.8) +.079 .295 -.039 +2 ) (7.5 -1 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 Power Rating (W) Thermal Fuse 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 AC 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 (Ω) 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 E= √ P • R • 6.25 * Other combinations 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. 160 12/27/13 KOA Speer Electronics, Inc. • 199 Bolivar Drive • Bradford, PA 16701 • USA • 814-362-5536 • Fax: 814-362-8883 • www.koaspeer.com thermal fuse built-in resistor environmental applications Derating Curve 100 Percent Rated Power (%) Percent Rated Power (%) 100 Temp. Symbol 80 60 10˚ 40 14˚ 20 Temp. Symbol 80 60 40 12˚ 8˚ 35˚ 33˚ 20 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 derated in accordance with the above rating curves. Temperature Rise (deg) 200 5N 150 7N 100 10N 50 Measuring Point 0 2 4 8 6 Load Power (W) Performance Characteristics Parameter Resistance T.C.R. Requirement ∆ R ±(%+0.05Ω) Limit Typical Within specified — tolerance -6 ±250 x 10 /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. 12/30/10 KOA Speer Electronics, Inc. • 199 Bolivar Drive • Bradford, PA 16701 • USA • 814-362-5536 • Fax: 814-362-8883 • www.koaspeer.com 161 resistors WF