RES-METALOHM Datasheet, PDF (1/2 Pages) Ohmite Mfg. Co. – Flameproof and inorganic

Metalohm Series
Cold Rolled Steel Encased Wirewound
Heatsinkable Radial Terminal
F e at u r e s
• Flameproof and inorganic
• Higher power rating due to
heat sink capacity
• All welded construction
• Nonhygroscopic
• High surge construction
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
SERIES SPECI F ICATI O NS
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 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.
characteristics
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 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
Wires
• Stranded, available in any insulation rated 125°C
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
Sleeves
• Steatite construction
• 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 211 252, 279 276 278 277
Style Dielectric Strength
20/45M
1500 N/A N/A N/A N/A
40/70M
1500 1500 2500 2500 N/A
HV40/70M
N/A
N/A
N/A
N/A 4250
50/100M
60/115M
1500 1500 2500 2500 N/A
1500 1500 2500 2500 N/A
85/150M
1500 1500 2500 2500 N/A
297 298
2500V
2500V
N/A
2500V
2500V
2500V
2500V
2500V
N/A
2500V
2500V
2500V
(continued)
1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax [phone] • www.ohmite.com • [e-mail]
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