270 Series Vitreous Enamel Power Resistors Series Wattage Ohms L12 12 0.1-51K L25 25 0.15-100K L50 50 0.38-260K L100 100 0.23-101K L175 175 0.13-101K L225 225 0.16-129K L500 500 0.38-218K L1000 1000 0.69-392K Select 270 Type fixed resistors for applications requiring wattage ratings from 12 to 1000 watts. The 270 Type resistors are equipped with lug terminals suitable for soldering or sturdy bolt connection. When secure mounting is required, the hollow core of these resistors permit fastening with springtype brackets, thru bolts or thru bolts with slotted-steel brackets. Suitable for rugged applications, the 270 Type resistors feature all-welded construction and durable lead free vitreous enamel coating. Mounting brackets not included with resistors. C D L Dimensions (in. / mm) L D C Length Diam. I. D. Core 1.75 / 44.4 0.313 / 7.94 0.188 / 4.76 2.0 / 50.8 0.562 / 14.3 0.313 / 7.94 4.0 / 101.6 0.562 / 14.3 0.313 / 7.94 6.5 / 165.1 0.750 / 19.1 0.50 / 12.7 8.5 / 215.9 1.125 / 28.6 0.75 / 19.1 10.5 / 266.7 1.125 / 28.6 0.75 / 19.1 12.0 / 304.8 2.50 / 63.5 1.75 / 44.5 20.0 / 508.0 2.50 / 63.5 1.75 / 44.5 Voltage 565 625 1625 2845 3595 4595 4970 8900 Non-Inductive versions available; Other sizes available; Also available in low cost Centohm coating; Consult Factory. ORDERING INFO M A D E - T O - O R D E R OPRADRET RS I N G I N F O RoHS Compliant Series Wattage Tolerance F = 1% H = 3% J = 5% K = 10% See page 40 for custom core and terminal info Ohms 1R0 = 1 250 = 250 1K0 = 1,000 25K = 25,000 25K5 = 25,500 Power limitations for high resistance values: When resistance exceeds the resistance values listed at right, derate the Power Rating by 25% to improve reliability: Power rating 12W 25W 50W 100W Core Diameter See "Core and Terminal Selection" Terminal Type See "Resistor Terminals for Tubular Cores" RoHS Compliant Wattage Coating 270 = Vitreous 470 = Silicone Ceramic Resistance value 3,900 12,000 35,000 75,000 Tolerance F = 1% H = 3% J = 5% K = 10% Ohms R500 = 0.500 1R00 = 1 250R = 250 1K00 = 1,000 25K0 = 25,000 25K5 = 25,500 No power derating necessary for ratings higher than 100W. See page 34 for mounting hardware FEATURES * Terminals suitable for soldering or bolt connection. * High wattage applications. * Rugged lead free vitreous enamel coating. * Flame resistant coating. * All-welded construction. * RoHS compliant product available Jan. 2006 Add "E" suffix to part number to specify. SPECIFICATIONS Material Coating: Lead free vitreous enamel. Core: Tubular ceramic. Terminals: Solder coated radial lug. Derating: Linearly from 100% @ +25C to 0% @ +350C. Electrical Tolerance: 5% 1 and over (J) 10% under 1 (K) Power rating: Based on 25C free air rating. Overload: 10 times rated wattage for 5 seconds. Temperature coefficient: 1 to 20: 400 ppm/C. Above 20: 260 ppm/C Dielectric withstanding voltage: 1000 VAC: 12 to 100 watt rating. 3000 VAC: 175 to 225 watt rating (Measured from terminal to mounting bracket) To calculate max. amps: use the formula P/R S TA N D A R D PA RT N U M B E R S F O R S TA N D A R D R E S I S TA N C E VA L U E S = Most popular Standard values = Standard values = Non-Standard values subject to minimum handling charge per item Ohmite Mfg. Co. L500J--- 500 L1000J---1000 L225J--- 225 L175J--- 175 4,000 5,000 6,000 7,500 8,000 10,000 12,000 15,000 20,000 25,000 30,000 35,000 40,000 50,000 60,000 70,000 75,000 80,000 100,000 125,000 150,000 175,000 200,000 250,000 L50J--- 50 L100J--- 100 Part No. Prefix Suffix ---4K0 ---5K0 ---6K0 ---7K5 ---8K0 ---10K ---12K ---15K ---20K ---25K ---30K ---35K ---40K ---50K ---60K ---70K ---75K ---80K ---100K ---125K ---150K ---175K ---200K ---250K L25J--- 25 L225J--- 225 Ohmic value L175J--- 175 L500J--- 500 L100J--- 100 L1000J---1000 L50J--- 50 1 2 3 4 5 10 15 25 50 75 100 125 150 200 250 500 750 800 1,000 1,500 2,000 2,500 3,000 3,500 Part No. Prefix Suffix ---1R0 ---2R0 ---3R0 ---4R0 ---5R0 ---10R ---15R ---25R ---50R ---75R ---100 ---125 ---150 ---200 ---250 ---500 ---750 ---800 ---1K0 ---1K5 ---2K0 ---2K5 ---3K0 ---3K5 L25J--- 25 12 Watt L12J470 L12J560 L12J680 L12J820 L12J1K0 L12J1K2 L12J1K5 L12J1K8 L12J2K2 L12J2K7 L12J3K3 L12J3K9 L12J4K7 L12J5K6 L12J6K8 L12J8K2 L12J10K L12J12K L12J15K L12J18K L12J22K L12J27K L12J33K L12J39K L12J47K L12J51K Wattage 12 Watt L12JKR51 L12J1R0 L12J1R5 L12J2R2 L12J3R3 L12J4R7 L12J6R8 L12J10R L12J12R L12J15R L12J18R L12J22R L12J27R L12J33R L12J39R L12J47R L12J56R L12J68R L12J82R L12J100 L12J120 L12J150 L12J180 L12J220 L12J270 L12J330 L12J390 Ohmic value 470 560 680 820 1000 1200 1500 1800 2200 2700 3300 3900 4700 5600 6800 8200 10000 12000 15000 18000 22000 27000 33000 39000 47000 51000 Ohmic value Wattage Ohmic value 0.51 1 1.5 2.2 3.3 4.7 6.8 10 12 15 18 22 27 33 39 47 56 68 82 100 120 150 180 220 270 330 390 Shaded values involve very fine resistance wire and should not be used in critical applications without burn-in and/or thermal cycling. Red outlined values supplied in Silicone-Ceramic coatings instead of vitreous enamel. 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