F55J40RE

250 Series • All-welded construction. • RoHS compliant product available. Add “E” suffix to part number to specify. ‘Thin’ Stackohm® Vitreous Enamel Power �������� 0.031" 0.794 mm Diam. 0.063" 1.588 mm Diam. 0.125" 3.175 mm 0.110": 2.776 mm 0.125" 3.175 mm 0.625" 15.875 mm 0.375" 9.525 mm 10W & 20W L A 0.125" * 3.175 mm 0.375" 9.525 mm 0.250" 6.350 mm 0.125" 3.175 mm Diam. 0.109" 2.776 mm Diam. 0.196" 4.979 mm 0.250" 6.350 mm 0.188" 4.763 mm 30W, 40W & 55W L A 1.000" 25.400 mm Material Coating: Lead free vitreous enamel. Core: Ceramic. Terminals: Tinned lug with hole. RoHS solder composition is 96% Sn, 3.5% Ag, 0.5% Cu Derating: Linearly from 100% @ +25°C to 0% @ +350°C. Electrical Tolerance: ±5% (J) Power rating: Based on mounting a single resistor on a metal surface measuring 10” (254mm) square by 0.04” (1.016mm) F eat u r es thick. Reduce rating by 15% when mounting on non-metallic • Small size-to-power ratio. surface. • Stackable Overload: 10x rated wattage for • Integral mounting bracket con5 seconds if max. voltage is not ducts heat to mounting surface. exceeded. • Low profile for use in equipment Temperature coefficient: where space is limited. 1 to 20Ω: ±400 ppm/°C. Over 20Ω: ±260 ppm/°C ordering infO Dielectric withstanding Series RoHS Compliant voltage: 500 VAC: 10 and 20 watt rating. 1000 VAC: 30, 40 and 55 watt rating (measured from lug to Coating Wattage Tolerance Ohms Blank = Vitreous F = 1% 1R0 = 1 Ω mounting bracket) C = Centohm H = 3% 250 = 250 Ω To calculate max. amps: S = Silicone J = 5% 1K0 = 1,000 Ω K = 10% 25K = 25,000 Ω use the formula √P/R 0.375" 9.525 mm S pe c i f i c at i ons 0.938" 23.813 mm When limited space is a consideration, choose Ohmite’s “thin” stackable 250 Type resistors. These oval-shaped ceramic-core resistors feature a low profile to permit installation in spaces with height restrictions. They are also equipped with integral mounting brackets so they can be fastened to a chassis and stacked in locations with limited surface area. When properly fastened, the mounting brackets add a heat sinking benefit resulting in a smaller size per watt. Durable 250 Type resistors are fully welded and coated with lead free vitreous enamel. 0.250" * 6.350 mm 0.125" 3.175 mm 0.438" 11.113 mm *Reference dimension only; varies according to resistance value. Note: When resistors are stacked, use washers or spacers as required to insure clearance and improve power dissipation. 25K5 = 25,500 Ω Made-to-order parts Terminal Type See website for See “Resistor Terminals for Tubular Cores” custom core info Tolerance RoHS Compliant J = 5% ��������������� Series Vitreous enamel: 25 = 250 Fixed 26 = 260 Adjustable Silicone ceramic: 45 = 450 Fixed 46 = 460 Adjustable Wattage & Core Code See “Core and Terminal Selection” Mounting Brackets (user supplies bracket for core TB) B = Stacking box S = Stacking stud, std. height H = Stacking stud high U = Unit type Ohms Example: 1R00 = 1 Ω 250R = 250 Ω 1K00 = 1,000 Ω 25K0 = 25,000 Ω 25K5 = 25,500 Ω Dimensions (in. /mm) Max. Length L Length A Voltage* 0.750 / 19.050 1.000 / 25.400 187 2.000 / 50.800 2.313 / 58.750 815 1.250 / 31.750 2.000 / 50.800 281 2.000 / 50.800 2.750 / 69.850 655 3.500 / 88.900 4.250 / 107.950 1405 Series Wattage Ohms F10 10 1.0-15K F20 20 1.0-50K F30 30 1.0-10K F40 40 1.0-25K F55 55 1.0-30K Adjustable versions available. Consult Ohmite. Other sizes available. Consult Ohmite. Also available in low cost Centohm or Silicone coating. Consult Ohmite. * Maximum Voltage is based on Ohm’s Law [V=√P*R] as limited by the resistance value of specified product S ta n d a r d pa rt n u m b e r s f o r 2 5 0 s e r i e s                                         1,500 2,000 2,500 3,000 4,000 5,000 6,000 7,500 10,000 15,000 20,000 25,000 40,000 –––1K5E –––2K0E –––2K5E –––3K0E –––4K0E –––5K0E –––6K0E –––7K5E –––10KE –––15KE –––20KE –––25KE –––40KE           F55J––– 55     F40J––– 40            F30J––– 30   F20J––– 20  –––50RE –––75RE –––100E –––150E –––200E –––250E –––300E –––400E –––500E –––750E –––800E –––1K0E –––1K25E Part No. Prefix  Suffix F10J––– 10 50 75 100 150 200 250 300 400 500 750 800 1,000 1,250 Ohmic value Ohmic value         F55J––– 55 F55J––– 55         F40J––– 40 F40J––– 40     F30J––– 30 F30J––– 30  F20J––– 20 F20J––– 20  F10J––– 10 F10J––– 10 –––1R0E –––1R5E –––2R0E –––3R0E –––4R0E –––5R0E –––7R5E –––10RE –––15RE –––20RE –––25RE –––30RE –––40RE Part No. Prefix  Suffix Wattage  1 1.5 2 3 4 5 7.5 10 15 20 25 30 40 Wattage  Part No. Prefix  Suffix  Ohmic value Wattage          = Standard values; check availability using the worldwide inventory search at www.ohmite.com         Ohmite Mfg. Co. 1600 Golf Rd., Rolling Meadows, IL 60008 • 1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com 33