ohmite mfg. co. 1600 golf rd., suite 850, rolling meadows, il 60008 ? tel. 1-866-9-ohmite ? fax 1-847-574-7522 ? www.ohmite.com ? info@ohmite.com ohmite mfg. co. 1600 golf rd., suite 850, rolling meadows, il 60008 ? tel. 1-866-9-ohmite ? fax 1-847-574-7522 ? www.ohmite.com ? info@ohmite.com metalohm series wirewound resistors 0.5" a b c ?0.195" d 0.75" term. style 276 (sq. collar , g3923) 278 (oval collar , g3860) 1.5" max. 0.250" ?0.068" 0.005 2 3 / 16 " max. term. style 277 1.5" max. term. style 279 0.437" dia. ?0.089" 1" max. term. style 21 1 term. style 252 5 / 16 " 1.25" max. ?0.171" term. style 297 1.25" max. term. style 298 wire wire f e a t u r e s ? flameproof and inorganic ? higher power rating due to heat sink capacity ? all welded construction ? nonhygroscopic ? high surge construction s p e c i f i c a t i o n s electrical wattage: based on a 275c 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 combina - tions may be lower) dielectric strength: terminal to case, depends on terminal style (1500v min.) creepage: term. style 277: 1.2 term. styles 278/276: 0.4/0.7 term. styles 211/252/279: 0.15 termination wires ? stranded, available in any insu - lation rated 125c 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 termina - tions available dielectric sleeves ? steatite construction ? style 276 meets ul/nema 2500v rms for one minute requirement ? available as terminal styles 276, 277, 278, 297 watts dimensions (inches) style w/o heat sink w/ heat sink* a b c d ohmic range** 20/45m 20 45 1 1 7 / 16 1 7 / 8 3 / 4 0.05-6k 40/70m 40 70 2 9 / 16 3 3 7 / 16 3 / 4 1.0-25k hv40-70m 40 70 2 9 / 16 3 3 7 / 16 7 / 8 1.0-25k 50/100m 50 100 3 11 / 16 4 1 / 8 4 9 / 16 3 / 4 1.5-47.5k 60/115m 60 115 5 9 / 16 6 6 7 / 16 3 / 4 2.5-81k *based on a 12x12x 1 / 8 aluminum heat sink, using a thermal compound, in a 25c ambient **standard winding ranges only listed, other values available; contact factory. d i e l e c t r i c s t r e n g t h 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 o p t i o n s ? 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 o r d e r i n g i n f o r m a t i o n ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? style ohm s 1r000 = 1.000 10r5k = 10,500 t erminal t ype a = 21 1 b = 252 c = 279 d = 276 non-inductive (optional) t olerance k = 10% j = 5% h = 3% g = 2% f = 1% rohs compliant e = 277 f = 278 g = 297 h = 298 30
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