Metalohm Series
FEATURES
• Flameproof and inorganic
• Higher power rating due to heat
sink capacity
• All welded construction
• Nonhygroscopic
• High surge construction
term. style 279
Cold Rolled Steel Encased Wirewound
Heatsinkable Radial Terminal
term. style 277
term. style 276 (sq. collar, G3923)
278 (oval collar, G3860)
0.250"
1.5" max.
SPECIFICATIONS
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. style 278: 0.4”
term. style 276: 0.7”
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
Dielectric Sleeves
• Steatite construction
• Style 276 meets UL/NEMA
2500V RMS for one minute
requirement
• Available as terminal styles 276,
277, 278, 297
ø0.195"
C
B
A
ø0.068"
±0.005
2
3
/
16
" max.
1.5" max.
term. style 252
0.5"
D
ø0.089"
term. style 211
5
/
16
"
ø0.171"
1" max.
1.25" max.
0.75"
term. style 297
0.437" dia.
wire
term. style 298
wire
1.25" max.
Watts
Style
w/o heat sink w/ heat sink*
20/45M
20
45
40/70M
40
70
HV40-70M
40
70
50/100M
50
100
60/115M
60
115
Dimensions (inches)
A
B
C
1
1
7
/
16
1
7
/
8
2
9
/
16
3
3
7
/
16
2
9
/
16
3
3
7
/
16
3
11
/
16
4
1
/
8
4
9
/
16
9
/
16
5
6
6
7
/
16
D
3
/
4
3
/
4
7
/
8
3
/
4
3
/
4
Ohmic range**
0.05-6K
1.0-25K
1.0-25K
1.5-47.5K
2.5-81K
*Based on a 12”x12”x
1
/
8
” aluminum heat sink, using a thermal compound, in a 25°C ambient
**Standard winding ranges only listed, other values available; contact Ohmite.
OPTIONS
• Noninductive versions (Aryton-
Perry windings)
• 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
• Tapped models
DIELECTRIC STRENGTH
Terminal Type 211
Style
20/45M
1500
40/70M
1500
HV40/70M
N/A
50/100M
1500
60/115M
1500
252, 279
N/A
1500
N/A
1500
1500
276
278
277
Dielectric Strength
N/A
N/A
N/A
2500
2500
N/A
N/A
N/A
4250
2500
2500
N/A
2500
2500
N/A
297
2500V
2500V
N/A
2500V
2500V
298
2500V
2500V
N/A
2500V
2500V
O R D E R I N G I N F O R M AT I O N
RoHS Compliant
½½½½½½½½½½½½½½½
Style
Non-inductive Tolerance
(optional)
K = 10%
J = 5%
Ohms
00R05 = 0.05
00R50 = 0.50
1R000 = 1.00
1K000 = 1,000
10K50 = 10,500
Terminal Type
A = 211 E = 277
B = 252 F = 278
C = 279 G = 297
D = 276 H = 298
Check product availability at
www.ohmite.com
Subscribe to our
New Product Bulletin at
ohmite.com
28
Ohmite Mfg. Co.
1600 Golf Rd., Rolling Meadows, IL 60008 • 1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com
