F E ꢀ T ꢁ R E S
• Flameproof and inorganic
• Higher power rating due to heat
sink capacity
• All welded construction
• Nonhygroscopic
Metalohm Series
Cold Rolled Steel Encased Wirewound
Heatsinkable Radial Terminal
• High surge construction
term. style 277
0.250"
term. style 276 (sq. collar, G3923)
term. style 279
S p E C ꢂ F ꢂ C ꢀ T ꢂ ꢃ ꢄ S
278 (oval collar, G3860)
Electrical
23/16" max.
ø0.068"
1.5" max.
1.5" max.
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)
±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.
Dielectric strength: Terminal to
case, depends on terminal style
(1500V min.)
Creepage:
term. style 277: 1.2”
term. style 297
term. style 298
0.437" dia.
wire
wire
term. style 278: 0.4”
term. style 276: 0.7”
1.25" max.
term. styles 211/252/279: 0.15”
Termination Wires
• 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* ꢀ
B
C
D
ꢃhmic range**
20/45M
20
40
40
50
60
85
45
70
70
1
17/16
17/8
3/4
0.05-6K
40/70M
29/16
29/16
311/16
59/16
71/2
3
3
37/16
37/16
49/16
67/16
81/2
3/4
7/8
3/4
3/4
3/4
1.0-25K
1.0-25K
1.5-47.5K
2.5-81K
HV40-70M
50/100M
60/115M
85/150M
100
115
150
41/8
6
8
4.5-100K
Dielectric Sleeves
• Steatite construction
*Based on a 12”x12”x1/8” aluminum heat sink, using a thermal compound, in a 25°C ambient
• Style 276 meets UL/NEMA
2500V RMS for one minute
requirement
• Available as terminal styles 276,
277, 278, 297
**Standard winding ranges only listed, other values available; contact Ohmite.
D ꢂ E ꢅ E C T R ꢂ C S T R E ꢄ ꢆ T H
ꢃ p T ꢂ ꢃ ꢄ S
• Noninductive versions (Aryton-
Perry windings)
Terminal Type 211 252, 279
276
278
277
297
298
Style
Dielectric Strength
20/45M
40/70M
HV40/70M
50/100M
60/115M
85/150M
1500
1500
N/A
1500
1500
1500
N/A
1500
N/A
1500
1500
1500
N/A
2500
N/A
2500
2500
2500
N/A
2500
N/A
2500
2500
2500
N/A 2500V 2500V
N/A 2500V 2500V
• Terminal sleeves to increase
dielectric strength and maximize
creepage distance
• Variety of terminal choices
• Potted or soldered wire terminals
including quick connect, ring,
spade terminals
4250
N/A
N/A
N/A 2500V 2500V
N/A 2500V 2500V
N/A 2500V 2500V
o r d e r i n g i n f o r m at i o n
• Tapped models
RoHS Compliant
� ꢀ ꢁ ꢂ ꢀ ꢃ ꢄ ꢅ ꢆ ꢀ ꢇ ꢈ ꢀ ꢉ ꢊ
Style
Non-inductive Tolerance Ohms
Terminal Type
(optional) K = 10%
00R05 = 0.05
A = 211 E = 277
B = 252 F = 278
C = 279 G = 297
D = 276 H = 298
J = 5%
00R50 = 0.50
1R000 = 1.00
1K000 = 1,000
10K50 = 10,500
Check product availability at www.ohmite.com
Subscribe to our
ꢄew product Bulletin at
ohmite.com
Ohmite Mfg. Co.
1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com
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