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Metalohm Series

Style

Watts

Dimensions (inches)

Ohmic range**

Dielectric strength, by terminal type

w/o heat sink

w/ heat sink*

A

B

C

D

211

252, 279

276

278

277

297

298

20/45M

20

45

1

17/16

17/8

3/4

0.05-6K

1500

N/A

N/A

N/A

N/A

2500V

2500V

40/70M

40

70

29/16

3

37/16

3/4

1.0-25K

1500

1500

2500

2500

N/A

2500V

2500V

HV40-70M

40

70

29/16

3

37/16

7/8

1.0-25K

N/A

N/A

N/A

N/A

4250

N/A

N/A

50/100M

50

100

311/16

41/8

49/16

3/4

1.5-47.5K

1500

1500

2500

2500

N/A

2500V

2500V

60/115M

60

115

59/16

6

67/16

3/4

2.5-81K

1500

1500

2500

2500

N/A

2500V

2500V

*Based on a 12"x12"x¹/₈" aluminum heat sink, using a thermal compound, in a 25°C ambient
**Standard winding ranges only listed, other values available; contact factory.

OPTIONS Noninductive versions (Aryton-Perry windings) Terminal sleeves to increase dielectric strength and maximize creepage distance Variety of terminal choices Potted or soldered wire leads including quick connect, ring, spade terminals Tapped models FEATURES Flameproof and inorganic Higher power rating due to heat sink capacity All welded construction Nonhygroscopic High surge construction

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 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). 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 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

HOW TO ORDER