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20/45M-F17800-297

更新时间： 2024-11-27 09:44:27
品牌 Logo 应用领域
OHMITE /
页数 文件大小 规格书
1页 134K
描述
Fixed Resistor, Wire Wound, 20W, 1780ohm, 1% +/-Tol, 90ppm/Cel, Chassis Mount

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20/45M-F17800-297 数据手册

  
F E A T U R E S  
• Flameproof and inorganic  
• Higher power rating due to heat  
sink capacity  
• All welded construction  
• Nonhygroscopic  
Metalohm Series  
Wirewound Resistors  
term. style 277  
0.250"  
term. style 276 (sq. collar, G3923)  
278 (oval collar, G3860)  
• High surge construction  
term. style 279  
23/16" max.  
S P E C I F I C A T I O N S  
Electrical  
Wattage: Based on a 275°C “U”  
characteristic derating curve  
Temperature coefficient:  
≥18 ohm: 0 ±90ppm/°C  
8 < 18 ohm: 0 ±50ppm/°C  
<8 ohm: 0 ±180ppm/°C  
(TC for some watt/ohm combina-  
tions may be lower)  
Dielectric strength: Terminal to  
case, depends on terminal style  
(1500V min.)  
Creepage: term. style 277: 1.2”  
term. styles 278/276: 0.4”/0.7”  
term. styles 211/252/279: 0.15”  
Termination Wires  
ø0.068"  
1.5" max.  
1.5" ma  
±0.005  
C
B
A
term. style 252  
ø0.195"  
5/16"  
term. style 211  
0.5" D  
0.75"  
ø0.089"  
ø0.171"  
1" max.  
1.25" max.  
term. style 297  
term. style 298  
0.437" dia.  
wire  
wire  
1.25" max.  
• Stranded, available in any insu-  
lation rated 125°C or higher  
(may require term. style 297).  
• Custom cut/stripped lengths  
• Can be potted or pre-soldered to  
terminal styles 211 or 252  
• Quick connect (fully or partially  
insulated), ring or spade termina-  
tions available  
Watts  
Dimensions (inches)  
Style  
w/o heat sink w/ heat sink* A  
B
C
D
Ohmic range**  
20/45M  
20  
40  
40  
50  
60  
45  
70  
70  
1
17/16  
17/8  
3/4  
0.05-6K  
40/70M  
HV40-70M  
50/100M  
60/115M  
29/16  
29/16  
311/16  
59/16  
3
3
37/16  
37/16  
49/16  
67/16  
3/4  
7/8  
3/4  
3/4  
1.0-25K  
1.0-25K  
1.5-47.5K  
2.5-81K  
100  
115  
41/8  
6
*Based on a 12”x12”x1/8” aluminum heat sink, using a thermal compound, in a 25°C ambient  
Dielectric Sleeves  
• Steatite construction  
**Standard winding ranges only listed, other values available; contact factory.  
• Style 276 meets UL/NEMA  
2500V RMS for one minute  
requirement  
• Available as terminal styles 276,  
277, 278, 297  
D I E L E C T R I C S T R E N G T H  
O P T I O N S  
• Noninductive versions (Aryton-  
Perry windings)  
•
Terminal sleeves to increase  
dielectric strength and maximize  
creepage distance  
• Variety of terminal choices  
• Potted or soldered wire leads  
including quick connect, ring,  
spade terminals  
Terminal Type 211 252, 279  
276  
278  
277  
297  
298  
Style  
Dielectric Strength  
20/45M  
40/70M  
HV40/70M  
50/100M  
60/115M  
1500  
1500  
N/A  
1500  
1500  
N/A  
1500  
N/A  
1500  
1500  
N/A  
2500  
N/A  
2500  
2500  
N/A  
2500  
N/A  
2500  
2500  
N/A 2500V 2500V  
N/A 2500V 2500V  
4250  
N/A 2500V 2500V  
N/A 2500V 2500V  
N/A  
N/A  
O R D E R I N G I N F O R M AT I O N  
•
Tapped models  
� ꢀ ꢁ ꢂ ꢀ ꢃ ꢄ ꢅ ꢆ ꢇ ꢀ ꢈ ꢉ ꢊ ꢅ ꢋ ꢂ ꢌ  
Style  
Non-inductive Tolerance Ohms  
Terminal Type  
(see diagram)  
(optional) K = 10%  
J = 5%  
1R000 = 1.000  
10R5K = 10,500  
H = 3%  
G= 2%  
F = 1%  
Ohmite Mfg. Co. 1600 Golf Rd., Suite 850, Rolling Meadows, IL 60008 • Tel. 1-866-9-OHMITE • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com  
27  
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