SWT/EWT Series Stackpole Electronics, Inc. Non-Flammable Edgewound Tubular Wirewound Resistor Resistive Product Solutions Features: • High current capability • RoHS compliant, lead-free and halogen-free • Non-inductive style only available with silicone coating (NSWT) • Suitable for soldering or thru bolt connections • Wirewound ribbon on ceramic substrate • SWT – Silicone coating provides temperature handling up to 350ºC • SWTA – Adjustable version • EWT – Vitreous enamel coating provides temperature handling up to 500ºC Electrical Specifications Dielectric Ohmic Range (Ω) and Tolerance Type/Code P o w e r R a t i n g ( W a tts) (SWT, EWT, NSWT) @ 25ºC Strength 5%, 10% VAC SWT NSWT EWT 25 25W 2,500 0.1 - 30K 0.1 - 100 1 - 10K 50 50W 2,500 0.1 - 50K 0.1 - 275 1 - 20K 100 100W 2,500 0.1 - 100K 0.12 - 680 1 - 50K 225 225W 2,500 0.2 - 130K 0.3 - 1.7K 1 - 130K -55ºC 25ºC Power Derating Curve: 100 %) er ( 80 w o P 60 d e at R 40 nt ce er 20 P 350ºC 0 -60 0 50 100 150 200 250 300 350 Ambient Temperature (ºC) Mechanical Specifications Type/Code OD ID L F E G Unit (SWT, EWT, NSWT) 0.563 ± 0.039 0.313 ± 0.039 2.008 ± 0.079 0.472 ± 0.039 0.177 0.079 inches 25 14.30 ± 1.00 7.94 ± 1.00 51.00 ± 2.00 12.00 ± 1.00 4.50 2.00 mm 50 0.563 ± 0.039 0.313 ± 0.039 4.016 ± 0.079 0.748 ± 0.039 0.315 0.197 inches 14.30 ± 1.00 7.94 ± 1.00 102.00 ± 2.00 19.00 ± 1.00 8.00 5.00 mm 0.752 ± 0.039 0.500 ± 0.039 6.496 ± 0.079 0.669 ± 0.039 0.315 0.197 inches 100 19.10 ± 1.00 12.70 ± 1.00 165.00 ± 2.00 17.00 ± 1.00 8.00 5.00 mm 1.126 ± 0.039 0.752 ± 0.039 10.512 ± 0.079 0.709 ± 0.039 0.354 0.197 inches 225 28.60 ± 1.00 19.10 ± 1.00 267.00 ± 2.00 18.00 ± 1.00 9.00 5.00 mm Rev Date: 09/05/2018 1 www.seielect.com This specification may be changed at any time without prior notice marketing@seielect.com Please confirm technical specifications before you order and/or use.

SWT/EWT Series Stackpole Electronics, Inc. Non-Flammable Edgewound Tubular Wirewound Resistor Resistive Product Solutions Hardware: • Sturdy plated steel brackets, thru-bolts, centering washers, and insulating washers • Brackets provide elongated mounting holes for ease of mounting Mounting Brackets Mechanical Specifications Resistor Power Rating A B C D E F Unit 1.000 0.750 0.500 0.219 0.438 0.177 inches 25W 25.40 19.05 12.70 5.56 11.13 4.50 mm 1.000 0.750 0.500 0.219 0.438 0.315 inches 50W 25.40 19.05 12.70 5.56 11.13 8.00 mm 1.000 0.750 0.500 0.219 0.438 0.315 inches 100W 25.40 19.05 12.70 5.56 11.13 8.00 mm 1.500 0.875 1.250 0.281 0.563 0.354 inches 225W 38.10 22.23 31.75 7.14 14.30 9.00 mm Bolts and Washers Mechanical Specifications Metal Centering Washer Mica Insulating Washer Core B o lt Resistor Power Rating OD Bolt No. A B C D Unit Length Length 0.563 2.008 2.500 0.560 0.190 0.750 0.313 inches 25W 10 14.30 51.00 63.50 14.22 4.83 19.05 7.95 mm 0.563 4.016 4.750 0.560 0.190 0.750 0.313 inches 50W 10 14.30 102.00 120.65 14.22 4.83 19.05 7.95 mm 0.752 6.496 7.000 0.750 0.190 1.000 0.500 inches 100W 10 19.10 165.00 177.80 19.05 4.83 25.40 12.70 mm 1.126 10.512 11.250 1.125 0.250 1.500 0.750 inches 225W 0.25" 28.60 267.00 285.75 28.58 6.35 38.10 19.05 mm Rev Date: 09/05/2018 2 www.seielect.com This specification may be changed at any time without prior notice marketing@seielect.com Please confirm technical specifications before you order and/or use.

SWT/EWT Series Stackpole Electronics, Inc. Non-Flammable Edgewound Tubular Wirewound Resistor Resistive Product Solutions Spring Clips Mechanical Specifications Resistor Power Rating A B C D Unit 0.625 0.250 0.469 0.313 inches 25W 15.88 6.35 11.91 7.95 mm 0.625 0.250 0.469 0.313 inches 50W 15.88 6.35 11.91 7.95 mm RoHS Compliance Stackpole Electronics has joined the worldwide effort to reduce the amount of lead in electronic components and to meet the various regulatory requirements now prevalent, such as the European Union’s directive regarding “Restrictions on Hazardous Substances” (RoHS 3). As part of this ongoing program, we periodically update this document with the status regarding the availability of our compliant components. All our standard part numbers are compliant to EU Directive 2011/65/EU of the European Parliament as amended by Directive (EU) 2015/863/EU as regards the list of restricted substances. RoHS Compliance Status Stan dard Lead-Free Standard Package / Lead-Free Series Lead-Free Termination Effective Date Product Description Termination Mfg. Effective Date RoHS Composition Code Series Type (Std Product Series) Compliant (YY/WW) SWT Non-Flammable Edgewound Tubular Special YES 100% Matte Sn Always Always Wirewound Silicone Coating Resistor Non-Flammable Edgewound EWT Tubular Wirewound Vitreous S p e cial YES 100% Matte Sn Always Always Enamel Coating Resistor “Conflict Metals” Commitment We at Stackpole Electronics, Inc. are joined with our industry in opposing the use of metals mined in the “conflict region” of the eastern Democratic Republic of the Congo (DRC) in our products. Recognizing that the supply chain for metals used in the electronics industry is very complex, we work closely with our own suppliers to verify to the extent possible that the materials and products we supply do not contain metals sourced from this conflict region. As such, we are in compliance with the requirements of Dodd-Frank Act regarding Conflict Minerals. Compliance to “REACH” We certify that all passive components supplied by Stackpole Electronics, Inc. are SVHC (Substances of Very High Concern) free and compliant with the requirements of EU Directive 1907/2006/EC, “The Registration, Evaluation, Authorization and Restriction of Chemicals”, otherwise referred to as REACH. Contact us for complete list of REACH Substance Candidate List. Rev Date: 09/05/2018 3 www.seielect.com This specification may be changed at any time without prior notice marketing@seielect.com Please confirm technical specifications before you order and/or use.

SWT/EWT Series Stackpole Electronics, Inc. Non-Flammable Edgewound Tubular Wirewound Resistor Resistive Product Solutions Environmental Policy It is the policy of Stackpole Electronics, Inc. (SEI) to protect the environment in all localities in which we operate. We continually strive to improve our effect on the environment. We observe all applicable laws and regulations regarding the protection of our environment and all requests related to the environment to which we have agreed. We are committed to the prevention of all forms of pollution. How to Order 1 2 3 4 5 6 7 8 9 10 11 12 E W T M 5 0 J B 2 0 0 R Product Series Type Power Tolerance Packaging Resistance Value Code Description Code Description Code Power Code Tol Code Description Size Quantity Silicone Coating - Std Tab Connection 25 25W J 5% B Bulk All Sizes Each Four characters SWT with the multiplier (std) M Mounting Hardware 50 50W K 10% used as the EWT Vitreous Enamel S Spring Clips 100 100W decimal holder. Non-inductive L Welded Straight Leads 225 225W NSWT Silicone Coating A Adjustable 1 ohm = 1R00 10 Kohm = 10K0 100 Kohm = 100K Rev Date: 09/05/2018 4 www.seielect.com This specification may be changed at any time without prior notice marketing@seielect.com Please confirm technical specifications before you order and/or use.