Metalohm series
Cold Rolled Steel Encased Wirewound
Heatsinkable Radial Terminal
F e at u r e s OptiOns
Flameproof and inorganic Noninductive versions (Ar yton-Perr y windings)
Higher power rating due to Terminal sleeves to increase dielectric strength
heat sink capacity and maximize creepage distance
All welded construction Variety of terminal choices
Nonhygroscopic Potted or soldered wire terminals including
quick connect, ring, spade terminals
High surge construction
Tapped models
series speciFicatiOns
Style Watts w/o heat sink Watts w/ heat sink* Ohmic range**
20/45M 20 45 0.05-6K
40/70M 40 70 1.0-25K
HV40-70M 40 70 1.0-25K
50/100M 50 100 1.5-47.5K
60/115M 60 115 2.5-81K
85/150M 85 150 4.5-100K
*Based on a 12x12x0.125 aluminum heat sink, using a thermal compound, in a 25C ambient
**Standard winding ranges only listed, other values available; contact Ohmite.
characteristics
Wattage Based on a 275C U characteristic derating curve Dielectric Strength/Terminal Availability
Temperature 18 ohm: 0 90ppm/C
Terminal Type 211 252, 279 276 278 277 297 298
coefficient 8 < 18 ohm: 0 50ppm/C
Style Dielectric Strength
<8 ohm: 0 180ppm/C
20/45M 1500 N/A N/A N/A N/A 2500V 2500V
(TC for some watt/ohm combinations may be lower)
40/70M 1500 1500 2500 2500 N/A 2500V 2500V
Dielectric Terminal to case, depends on terminal style (1500V
HV40/70M N/A N/A N/A N/A 4250 N/A N/A
strength min.)
50/100M 1500 1500 2500 2500 N/A 2500V 2500V
60/115M 1500 1500 2500 2500 N/A 2500V 2500V
Creepage term. style 277: 1.2
term. style 278: 0.4 85/150M 1500 1500 2500 2500 N/A 2500V 2500V
term. style 276: 0.7
term. styles 211/252/279: 0.15
Termination Stranded, available in any insulation rated 125C
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
Steatite construction
Dielectric
Sleeves Style 276 meets UL/NEMA 2500V RMS for one
minute requirement
Available as terminal styles 276, 277, 278, 297
(continued)
1-866-9-OHMITE Intl 1-847-258-0300 Fax 1-847-574-7522 www.ohmite.com info@ohmite.com 135Metalohm series
Cold Rolled Steel Encased Wirewound
Heatsinkable Radial Terminal
diMensiOns
(in.)
term. style 277
0.250"
term. style 276 (sq. collar, G3923)
term. style 279
278 (oval collar, G3860)
3
2 /16" max.
0.068" 1.5" max. 1.5" max.
0.005
C
B
term. style 252
A
0.195"
5
/16"
term. style 211
0.5" D
0.089"
0.171"
1.25" max.
1" max.
0.75"
term. style 297
term. style 298
0.437" dia.
wire
wire
1.25" max.
Style A B C D
7 7 3
20/45M 1 1 /16 1 /8 /4
9 7 3
40/70M 2 /16 3 3 /16 /4
9 7 7
HV40-70M 2 /16 3 3 /16 /8
11 1 9 3
50/100M 3 /16 4 /8 4 /16 /4
9 7 3
60/115M 5 /16 6 6 /16 /4
1 1 3
85/150M 7 /2 8 8 /2 /4
Ordering inFOrMatiOn
Not all terminal types available for all Metalohm sizes
RoHS Compliant
Style Non-inductive Tolerance Ohms Terminal Type
(optional) K= 10% 00R05 = 0.05 A = 211 E = 277
J = 5% 00R50 = 0.50 B = 252 F = 278
1R000 = 1.00 C = 279 G = 297
1K000 = 1,000 D = 276 H = 298
10K50 = 10,500
136 1-866-9-OHMITE Intl 1-847-258-0300 Fax 1-847-574-7522 www.ohmite.com info@ohmite.com