Metalohm series
Cold Rolled Steel Encased Wirewound
Heatsinkable Radial Terminal
F e at u r e s
OptiOns
• Flameproof and inorganic
• Higher power rating due to
heat sink capacity
• All welded construction
• Nonhygroscopic
• High surge construction
• 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
s e r i e s s p e c i F i c at i O n s
Style
Watts w/o heat sink Watts w/ heat sink*
20/45M
20
45
40/70M
40
70
HV40-70M
40
70
50/100M
50
100
60/115M
60
115
85/150M
85
150
*Based on a 12”x12”x0.125” aluminum heat sink, using a thermal compound, in a 25°C ambient
**Standard winding ranges only listed, other values available; contact Ohmite.
Ohmic range**
0.05-6K
1.0-25K
1.0-25K
1.5-47.5K
2.5-81K
4.5-100K
characteristics
Wattage
Based on a 275°C “U” characteristic derating curve
Temperature
≥18 ohm: 0 ±90ppm/°C
coefficient
8 < 18 ohm: 0 ±50ppm/°C
<8 ohm: 0 ±180ppm/°C
(TC for some watt/ohm combinations may be lower)
Dielectric
Terminal to case, depends on terminal style (1500V
strength
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
• Stranded, available in any insulation rated 125°C
Wires
or higher (may require term. style 297).
• 12" standard length for term. 297 & 298 (custom
lengths available)
• Can be potted or pre-soldered to terminal styles
211 or 252
• Quick connect (fully or partially insulated), ring or
spade terminations available
Dielectric
• Steatite construction
Sleeves
• Style 276 meets UL/NEMA 2500V RMS for one
minute requirement
• Available as terminal styles 276, 277, 278, 297
Dielectric Strength/Terminal Availability
Terminal Type
Style
20/45M
40/70M
HV40/70M
50/100M
60/115M
85/150M
1500
1500
1500
1500
N/A
1500
1500
1500
N/A
N/A
211
252, 279
276
N/A
N/A
278
N/A
N/A
277
N/A
4250
N/A
N/A
N/A
N/A
297
2500V
2500V
2500V
2500V
2500V
N/A
298
2500V
2500V
2500V
2500V
2500V
N/A
Dielectric Strength
2500
2500
2500
2500
2500
2500
1500
1500
2500
2500
(continued)
1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com
135
Metalohm series
Cold Rolled Steel Encased Wirewound
Heatsinkable Radial Terminal
diMensiOns
(in.)
term. style 276 (sq. collar, G3923)
278 (oval collar, G3860)
term. style 277
0.250"
1.5" max.
term. style 279
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.
Style
20/45M
40/70M
2
9
/
16
HV40-70M 2
9
/
16
50/100M 3
11
/
16
60/115M
85/150M
5
9
/
16
7
1
/
2
A
1
B
1
7
/
16
3
3
4
1
/
8
6
8
3
7
/
16
3
7
/
16
4
9
/
16
6
7
/
16
8
1
/
2
C
1
7
/
8
D
3
/
4
7
/
8
3
/
4
3
/
4
3
/
4
3
/
4
O r d e r i n g i n F O r M at i O n
Not all terminal types available for all Metalohm sizes
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
136
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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