280 Series F ea t u r e s Corrib® resistors are ideal for applications involving high currents at very low resistance values—as low as 0.1Ω for the 300 Watt unit. These large, heavy-duty resistors are designed to withstand frequent start-stop cycles characteristic of motor starting, dynamic braking and other similar applications. Special order units are available to accommodate up to 1500 watts. • Also available in low cost Centohm or Silicone coating. Consult Ohmite. • Ribbed construction aids in rapid cooling. • Designed for equipment requiring low resistance loads at low ohmic values and high current capacity. • Especially constructed for motor starting, dynamic braking, etc. • RoHS compliant product available. Add “E” suffix to part number to specify. ® Corribs are manufactured with corrugated resistive wire. To accelerate cooling, the wire is securely fused to the ceramic core by the protective vitreous enamel coating to improve durability. Corrib resistors are hollow-core units which can be securely fastened to chassis surfaces with thru bolts and brackets. Spec i f i ca t i o n s Material Coating: Lead free vitreous enamel except for extreme low resistance 35 watt models, and very large models (750 watts and up), which are supplied in Silicone Ceramic. Core: Tubular Ceramic. Terminals: Tinned lug with hole. RoHS solder composition is 96% Sn, 3.5% Ag, 0.5% Cu Adjustable Lug: Supplied ordering infO with adjustable 300 watt models. Part No. 1974-A or Coating 1974-B. Blank = Vitreous C = Centohm RoHS Compliant Electrical S = Silicone Tolerance: ±10% (K) Power rating: Based on Series Wattage Tolerance Ohms 25°C free air rating. C = Fixed K = 10% example: Derating: Linearly from E = Adjustable 1R0 = 1 Ω 250 = 250 Ω 100% @ +25°C to 0% 1K0 = 1,000 Ω @ +400°C. 25K = 25,000 Ω ��������� 25K5 = 25,500 Ω Corrib® Fixed and Adjustable Vitreous Enamel Power Fixed 35 watt Diam. 0.173 in. 4.394 mm 0.375 in. 9.525 mm 0.094 in. 2.381 mm 0.563 in. 14.288 mm 0.625 in. 15.88 mm 2.0 in. 50.80 mm 0.3125 in. 7.938 mm Fixed/Adjustable 300 watt* Diam. 0.196 in. +.015/-.006 0.500 in. ±.030 4.979 mm +.381/-.153 12.7 mm ±.79 1.125 in. 28.58 mm 0.75 in. 19.05 mm * for values over 0.16Ω, terminal dimensions same as 35 watt at above. Overload: 10 times rated wattage for 5 seconds. Temperature coefficient: ±400 ppm/°C. Dielectric withstanding voltage: 1000 VAC measured from terminal to mounting bracket. To calculate max. amps: use the formula √P/R Resistor hardware Thru Bolts Mounting Brackets for 300 Watt Corrib Includes 2 each bracket, bolt, washers (centering, mica, lock) and nut. Note: Single unit mounting contains 1 each bolt and nut; 2 each all Washers. No. of Moun. Part No. Res- Derat. Slotted Elongated istors % 6110-81/2 6126-P-81/2 1 100% - 6127-P-81/2 2 83% - 6128-P-81/2 3 80% - 6129-P-81/2 4 80% ��������������� Terminal Type See “Resistor Terminals for Tubular Cores” Ohms Example: R0200 = 0.02 Ω R2000 = 0.2 Ω 2R500 = 2.5 Ω 10R00 = 10 Ω Tolerance F = 1% H = 3% J = 5% K = 10% (std.) See website for custom core info Lugs for 300 Watt Adjustable Corrib Part No. S ta n d a r d pa rt n u m b e r s f o r 2 8 0 s e r i e s 0.8 1.0 1.2 1.25 1.6 2.0 2.5 3.1 4.0 5.0 6.3 8.0 10.0 12.0 16.0 20.0 100.0 –––R80E –––1R0E –––1R2E –––1R25E –––1R6E –––2R0E –––2R5E –––3R1E –––4R0E –––5R0E –––6R3E –––8R0E –––10RE –––12RE –––16RE –––20RE –––100E (Adjustable) E300K–––300 C300K–––300 Part No. Prefix Suffix C35K ––– 35 Ohmic value (Adjustable) E300K–––300 C300K–––300 –––R02E –––R04E –––R06E –––R08E –––R10E –––R12E –––R15E –––R16E –––R20E –––R25E –––R30E –––R31E –––R40E –––R50E –––R60E –––R63E C35K ––– 35 0.02 0.04 0.06 0.08 0.1 0.12 0.15 0.16 0.2 0.25 0.3 0.31 0.4 0.5 0.6 0.63 Wattage Part No. Prefix Suffix Ohmic value Wattage 0.032 in. 0.813 mm min. 0.75 in. 19.05 mm 8.5 in. 215.90 mm Made-to-order parts Series Wattage & 280 = Fixed Core Code 230 = Adjustable See “Core and Terminal Selection” 0.25 in. 6.35 mm Other Available Sizes (Partial List) Prefix* C90 C100 C110 C135 C150 C160 C180 C190 C215 C220 C270 C375 C500 C750 C1000 C1500 Wattage 90 100 110 135 150 160 180 190 215 220 270 375 500 750 1000 1500 Core Length 4.0” 3.5” 5.0” 6.0” 5.0” 6.0” 6.5” 6.0” 7.0” 6.0” 5.0” 10.5” 10.5” 12.0” 15.0” 20.0” Core O.D. 0.563” 0.75” 0.563” 0.563” 1.0” 0.75” 0.75” 1.0” 1.0” 1.125” 1.5” 1.125” 1.625” 2.5” 2.5” 2.5” Min. Ohms 0.021 0.021 0.029 0.028 0.043 0.038 0.031 0.056 0.068 0.063 0.065 0.130 0.190 0.310 0.410 0.560 Max. Ohms 12 11 16 21 27 26 29 35 43 39 41 80 117 198 258 358 1974-A 1/16 wire Resis- tance Part No. 0.40 1974-B 1/8 wire 0.50 0.63 1.00 1.50 1.60 2.00 2.50 3.10 4.00 5.00 6.30 8.00 10.00 12.00 16.00 20.00 25.00 30.00 48.00 50.00 Resistance 0.10 0.12 0.16 0.20 0.25 0.31 0.80 1.20 *Substitute “C” in = Standard values; check availability using the worldwide inventory prefix with “E” for search at www.ohmite.com adjustable versions. 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 • [email protected] 35