F10F1R0E OHMITE | Alldatasheet
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Technical content
Standard part numberS for 250 SerieS
250 Series
‘Thin’ Stackohm® Vitreous Enamel Power 20 –––20RE 30 –––30RE 40 –––40RE Dimensions (in. / mm) Max. Series Wattage Ohms Length L Length A Voltage* 150 –––150E 300 –––300E 800 –––800E 5,000 –––5K0E 6,000 –––6K0E 7,500 –––7K5E 15,000 –––15KE 20,000 –––20KE 25,000 –––25KE 40,000 –––40KE = Standard values; check availability using the worldwide inventory search at www.ohmite.com Ohmic value F10J––– 10 F20J––– 20 F30J––– 30 F40J––– 40 Wattage Part No. Prefix Suffix F55J––– 55 Ohmic value F10J––– 10 F20J––– 20 F30J––– 30 F40J––– 40 Wattage Part No. Prefix Suffix F55J––– 55 Wattage Ohmic value F10J––– 10 F20J––– 20 F30J––– 30 F40J––– 40 Part No. Prefix Suffix F55J––– 55 0.625" 15.875 mm0.031" 0.794 mm 0.125" 3.175 mmDiam. 0.063" 1.588 mm Diam. 0.125" 3.175 mm L A0.110": 2.776 mm 0.250" 6.350 mm 0.375" 9.525 mm 10W & 20W 0.125" 3.175 mm 0.188" 4.763 mmDiam. 0.109" 2.776 mm Diam. 0.196" 4.979 mm L A0.250" 6.350 mm 0.125" 3.175 mm 0.438" 11.113 mm 30W, 40W & 55W 0.375" 9.525 mm 0.125" * 3.175 mm 1.000" 25.400 mm 0.250" * 6.350 mm 0.938" 23.813 mm 0.375" 9.525 mm When limited space is a con- sideration, choose Ohmite’s “thin” stackable 250 Type resistors. These oval-shaped ceramic-core resistors feature a low profile to permit instal- lation in spaces with height restrictions. They are also equipped with integral mount- ing brackets so they can be fastened to a chassis and stacked in locations with lim- ited surface area. When properly fastened, the mounting brackets add a heat sinking benefit result- ing in a smaller size per watt. Durable 250 Type resistors are fully welded and coated with lead free vitreous enamel.
FEATurES
- Small size-to-power ratio.
- Stackable
- Integral mounting bracket con- ducts heat to mounting surface.
- Low profile for use in equipment where space is limited.
- All-welded construction.
- RoHS compliant product avail- able. Add “E” suffix to part num- ber to specify. SPEciFicATiONS 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% @ Electrical Tolerance: ±5% (J) Power rating: Based on mount- ing a single resistor on a metal surface measuring 10” (254mm) square by 0.04” (1.016mm) thick. Reduce rating by 15% when mounting on non-metallic surface. Overload: 10x rated wattage for 5 seconds if max. voltage is not exceeded. Temperature coefficient: 1 to 20Ω: ±400 ppm/°C. Over 20Ω: ±260 ppm/°C Dielectric withstanding voltage: 500 VAC: 10 and 20 watt rating. 1000 VAC: 30, 40 and 55 watt rat- ing (measured from lug to mounting bracket) To calculate max. amps: use the formula √P/R ordering info made-to-order partS See web- site for custom core info Tolerance F= 1% H= 3% J= 5% K= 10% Ohms 1R0 = 1 Ω 250 = 250 Ω 1K0 = 1,000 Ω 25K = 25,000 Ω 25K5 = 25,500 Ω RoHS CompliantSeries WattageCoating Blank =V itreous C= Centohm S= Silicone Ohms Example: 1R00 = 1 Ω 250R = 250 Ω 1K00 = 1,000 Ω 25K0 = 25,000 Ω 25K5 = 25,500 Ω 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” Terminal Type See “Resistor Terminals for Tubular Cores” Mounting Brackets (user supplies bracket for core TB) B= Stacking box S= Stacking stud, std. height H= Stacking stud high U= Unit type RoHS Compliant Tolerance J= 5% *Reference dimension only; varies according to resistance value. 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 Note: When resistors are stacked, use washers or spacers as required to insure clearance and improve power dissipation.