METALOHM OHMITE | Alldatasheet

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Technical content

1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com 135 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 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 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 Metalohm series Cold Rolled Steel Encased Wirewound Heatsinkable Radial Terminal 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. Dielectric Strength/Terminal Availability Terminal Type 211 252, 279 276 278 277 297 298 Style Dielectric Strength 20/45M 1500 N/A N/A N/A N/A 2500V 2500V 40/70M 1500 1500 2500 2500 N/A 2500V 2500V HV40/70M N/A N/A N/A N/A 4250 N/A N/A 50/100M 1500 1500 2500 2500 N/A 2500V 2500V 60/115M 1500 1500 2500 2500 N/A 2500V 2500V 85/150M 1500 1500 2500 2500 N/A 2500V 2500V 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 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 series speciFicatiOns (continued)

1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com136 Style A B C D 20/45M 1 17/16 1 7/8 3/4 40/70M 29/16 3 37/16 3/4 HV40-70M 29/16 3 37/16 7/8 50/100M 311/16 4 1/8 4 9/16 3/4 60/115M 59/16 6 67/16 3/4 85/150M 71/2 8 81/2 3/4 0.5" A B C ø0.195" D 0.75" term. style 276 (sq. collar, G3923) 278 (oval collar, G3860) 1.5" max. 0.250" ø0.068" ±0.005 23/16" max. term. style 277 1.5" max. term. style 279 0.437" dia. ø0.089" 1" max. term. style 211 term. style 252 5/16" 1.25" max.ø0.171" term. style 297 1.25" max. term. style 298 wire wire Style Ohms 00R05 = 0.05 00R50 = 0.50 1R000 = 1.00 1K000 = 1,000 10K50 = 10,500 Terminal Type A = 211 B = 252 C = 279 D = 276 Non-inductive (optional) Tolerance K= 10% J= 5% RoHS Compliant E = 277 F = 278 G = 297 H = 298 diMensiOns (in.)

Ordering inFOrMatiOn

Not all terminal types available for all Metalohm sizes Metalohm series Cold Rolled Steel Encased Wirewound Heatsinkable Radial Terminal