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Effective March 2024 Supersedes March 2019 COOPER POWERSERIES ELSP current-limiting backup fuse General Eaton offers its Cooper Power™ series ELSP current-limiting backup fuse that is used in series with low current primary protection devices such as a Bay-O-Net fuse or its Cooper Power series MagneX™ interrupter. The ELSP fuse is designed for use in transformer oil, Envirotemp™ FR3™ fluid, or an approved equivalent. The fuse’s highly efficient current-limiting section minimizes the effects of high fault current stresses on equipment and the distribution system. Its minimum interrupting rating is coordinated with that of a low current interrupter to avoid undesirable low current operation; yet its maximum interrupting rating will clear the highest fault currents likely to occur. Higher continuous current ratings can be achieved by connecting two fuses in parallel. Application The ELSP fuse is used in transformers to protect and isolate faulted equipment. When connected in series with a low current primary protection device, the fuse becomes an element of a two-part protection system that gives a full range of fault protection. This two-part system provides low current protection with the replaceable expulsion fuse or resettable MagneX interrupter, and it adds the energy-limiting protection of a current-limiting fuse. Together, they coordinate easily with upstream and downstream devices. Powering Business Worldwide

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ELSP current-limiting backup fuse HIGH PURITY SILICA SAND FILLER Specific particle size, purity, and compaction gives the heat-absorbing and arc-quenching properties necessary for consistent clearing and low energy let-thru levels. MICA SPIDER Provides stable winding support without generating gas and pressure buildup during fuse operation. SOLID COPPER END CAPS Brass inserts are tapped for attachment of a 1/4 inch 20 x 1/2 inch lead hardware. DOUBLE SEALING SYSTEM Buna-N rubber gasket and epoxy sealant ensures seal performance and integrity. FIBERGLASS HOUSING Provides strength and...

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ELSP current-limiting backup fuse Catalog Data CA132013EN Effective March 2024 Table 1. Electrical ratings and characteristics Fuse type Maximum interrupting current 8.3 kV-15.5 kV backup "C” rated 50,000 A rms symmetrical 17.2 kV backup "C” rated 43,000 A rms symmetrical 23 kV backup "C” rated 31,000 A rms symmetrical © 38 kV backup "C” rated 50,000 A rms symmetrical © © 23 kV, 150 A fuse is rated to 50,000 A rms symmetrical. © 38 kV, 200 A fuse is rated to 26,000 A rms symmetrical due to test lab limitations. Table 2. Interrupting ratings Notes: 1. The 8.3 kV, 80 A and 100 A ratings have...

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Ordering information To order an ELSP current-limiting fuse, determine the amperage and voltage ratings of the application and specify the fuse required from Table 3. For parallel fusing, order two fuses. New part numbering guide C = Cooper XXX = Current rating C =2 inch D =3 inch 1 = Single-barrel design Table 3. Dimensional information EATON www.eaton.com/cooperpowerserie

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EATON www.eaton.com/cooperpowerseries

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ELSP current-limiting backup fuse Catalog Data CA132013EN Effective March 2024 Table 4. Recommended single-phase transformer Bay-O-Net and ELSP combinations 8.3 kV Nominal single-phase voltage (kV) phase-to-ground 2.44.16-4.87.2-7.96 Assumed Assumed Assumed Single-phase transformer ELSP Link transformer ELSP Link transformer ELSP Link transformer impedance rating catalog impedance rating catalog impedance rating catalog ELSP and current sensing Bay-O-Net fuse combinations 0 ELSP and dual element Bay-O-Net fuse combinations © 519030C0319030C0319030C03 1019030C0519030C041.9030C03...

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ELSP current-limiting backup fuse Catalog Data CA132013EN Effective March 2024 Table 4. Recommended single-phase transformer Bay-O-Net and ELSP combinations, continued 15.5 kV23 kV Nominal single-phase voltage (kV) phase-to-ground 12-12.4713.2-14.416-17.219.92 Assumed Assumed Assumed Assumed Single-phase transformer ELSP Link transformer ELSP Link transformer ELSP Link transformer ELSP Link transformer impedance rating catalog impedance rating catalog impedance rating catalog impedance rating catalog ELSP and dual sensing Bay-O-Net fuse combinations © 51.9030 C031.9030 C031.9030 C031.9030...

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ELSP current-limiting backup fuse Catalog Data CA132013ENEffective March 2024 Table 5. Recommended three-phase transformer Bay-O-Net and ELSP combinations with grounded wye-grounded wye-connected primary windings 8.3 kV ELSP fuse (phase-to-ground) Nominal three-phase voltage (kV) 4.167.2-7.9612-12.4713.214.4 Assumed Assumed Assumed Assumed Assumed Three-phase transformer ELSP Link transformer ELSP Link transformer ELSP Link transformer ELSP Link transformer ELSP Link transformer impedance rating catalog impedance rating catalog impedance rating catalog impedance rating catalog impedance...

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ELSP current-limiting backup fuse Catalog Data CA132013ENEffective March 2024 Table 5. Recommended three-phase transformer Bay-O-Net and ELSP combinations with grounded wye-grounded wye-connected primary winding, continued 15.5 kV ELSP fuse (phase-to-ground) Nominal three-phase voltage (kV) 20.822.8624.94 Assumed Assumed Assumed Three-phase transformer ELSP Link transformer ELSP Link transformer ELSP Link transformer impedance rating catalog impedance rating catalog impedance rating catalog ELSP and dual element Bay-O-Net fuse combinations © 4516030C0318030C0316030C03...

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ELSP current-limiting backup fuse Table 5. Recommended three-phase transformer Bay-O-Net and ELSP combinations with grounded wye-grounded wye-connected primary winding, continued 23 kV ELSP fuse (phase-to-ground) Nominal three-phase voltage (kV) 27.6 Assumed transformer ELSP Link Three-phase impedance rating catalog transformer (%) (A) number (kVA) ELSP and current sensing Bay-O-Net fuse combinations ① ELSP and dual sensing Bay-O-Net fuse combinations ELSP and dual element Bay-O-Net fuse combinations High amp overload Bay-O-Net/ELSP combinations 34.5 Assumed transformer impedance (%)...

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