Cmu Medium Voltage Power Fuses Catalog Eaton
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Fusing EquipmentCatalog Data COOPER POWER SERIES Effective September 2019CA132038EN Supersedes October 2015CMU medium voltage power fuses General Eaton’s Cooper Power™ series CMU power fuse The CMU power fuse interrupting rating greatly is a boric acid, expulsion-style fuse. Suitable for exceeds that of conventional distribution cutouts both indoor and outdoor applications, the CMU that use a fuse tube and link design, and power fuse provides an economical alternative to considerably reduces the hazards and noise of refillable fuses. CMU expulsion power fuses are the violent exhaust common to cutouts under available in three maximum voltage classes: 17 fault interrupting conditions. The CMU power fuse, kV, 27 kV, and 38 kV. The fuse unit comes in three employing the use of a calibrated silver element, speed variations: Standard “E”, Slow “SE”, and Fast boric acid for its interrupting media and rod “K”. Amperage sizes range from 3 A through 200 A. mechanism for arc extension, creates low arcing voltage and mild exhaust during fault interruption
Catalog Data CA132038EN CMU medium voltage power fusesEffective September 2019 SLIDING TULIP CONTACT To maintain positive connection between the arcing rod and the plated copper contacts
Actuating Pin HIGH RESISTANCE NICHROME WIRE STRAIN ELEMENT Tin-Plated Bottom Contact Shunts the fuse element and with Permanent Date Code vaporizes immediately after the fuse element melts. Boric Acid Liner Silver COMPRESSED SPRING (inside) Element END CAP WITH A BLOWOUT DISK HEAVY COPPER CYLINDRICAL FIBERGLASS EPOXY TUBE Permits exhaust DURABLE WEATHERPROOF LABEL ARCING ROD Applied to each fuse providing ratings Assures structural strength to exit during Conducts continuous rated and contains the force of arc operation. and manufacturing information. current under normal conditions. interruption
Figure 1. Fuse unit
Application Production testsThe CMU power fuses provide effective protection for circuits Tests are conducted in accordance with Eaton quality assuranceand equipment which operate on system voltages up to 34,500 V. requirements
They can be used on both electric utility and industrial distribution • Physical Inspectionsystems. Typical applications include: • Micro-Ohm Resistance Testing• Power Transformers • Construction Integrity Testing• Feeder Circuits• Distribution Transformers Installation• Potential Transformers No special tools are required to install the CMU power fuse. The• Station Service Transformers CMU power fuse and end fittings are designed to fit into industry• Metal-enclosed Switchgear standard mountings. Refer to Installation Instructions Sheet MN132032EN for details
• Pad-Mounted Switches• Overhead Capacitor Racks Electrical characteristicsCMU power fuses can be used in outdoor or indoor applications, and • The CMU power fuse interrupts at a natural current zero in thecan be used to directly replace competitive equivalent units. current wave and allows a minimum of a half cycle of fault currentWhen used in upstream system protection, the CMU power fuse to flow before the fault is cleared. The time-current characteristicsoperates promptly to limit the stress on electrical systems due to associated with a CMU power fuse have a gradual slope, makingshort circuits. It provides isolation for the faulted circuit, limiting the it easier to coordinate with downstream equipment
size of interrupted service area. • The CMU power fuse is ideal for higher voltage (up to 38 kV) andFull protection is provided for downstream equipment, even down high current applications (through 200 A). Proper coordination can beto minimum melt current, regardless of the nature of the fault. achieved through use of the appropriate time-current curves
The CMU power fuse acts rapidly to take transformer and feeder • The CMU power fuse provides effective protection for circuits andcircuits off-line before damage can become widespread. It also equipment which operates on voltages from 2,400 V to 34,500 V
provides excellent isolation for capacitors in the event of a faultcondition. When installed on the primary side of substation power • The CMU power fuse has interrupting capabilities from 10,000 totransformers, CMU power fuses provide protection against small, 14,000 A symmetrical
medium or large faults. • The CMU power fuse is offered in three configuration for use with high currents: “E” (standard), “K” (fast), and “SE” (slow). The curves for the “SE” are less inverse and allow for more of a time delay at high currents
• CMU power fuses, when used on the transformer-primary side, should be selected based on the anticipated normal transformer loading schedule, including daily or repetitive peak loads, and2 www.eaton.com/cooperpowerseries CMU medium voltage power fuses Catalog Data CA132038EN Effective September 2019 Element Melts Compressed Spring Water vapor and inert boric anhydride Vapor quenches arc at first current zero Rod withdraws elongating arc vaporizing Boric Acid Sliding TulipFigure 2. CMU power fuse cross section view
must be sized with the inrush currents in mind
The CMU power fuses have been designed and tested according tothe following standards:• IEEE Std C37.40™ standard–Service Conditions and Definitions for High-Voltage Fuses, Distribution Enclosed Single-Pole Air Switches, Fuse Disconnecting Switches, and Accessories• IEEE Std C37.41™ standard–Design Tests for High-Voltage Fuses, Distribution Enclosed Single-Pole Air Switches, Fuse Disconnecting Switches, and Accessories• IEEE Std C37.42™ standard–Specifications for High-Voltage Expulsion Type Distribution Class Fuses, Cutouts, Fuse Disconnecting Switches and Fuse links• IEEE Std C37.46™ standard–Specifications for High-Voltage Expulsion and Current-Limiting Type Power Class Fuses and Fuse Disconnecting Switches• IEEE Std C37.48.1™ standard–Guide for the Operation, Classification, Application, and Coordination of Current-Limiting Fuses with Rated Voltages 1–38 kVOperationThe CMU power fuse utilizes the proven performance of boric acidto create the de-ionizing action needed to interrupt the current
A spring-loaded arcing rod carries the normal continuous currentthrough the unit when the circuit is operational
Figure 3. Outdoor application (left) and dropout action (right)
Under normal conditions, the fusible element’s temperature iswell below its melting temperature and does not melt. When a from the operated fuse unit, and if undamaged, clamped onto thefault occurs that is large enough to melt the fuse element, an arc new fuse unit
is initiated and elongated by the units spring, pulling the arcing When installed indoors, the exhaust and noise produced during therod up into the boric acid interrupting media. The heat produced interruption process are limited by the muffler attached to the lowerdecomposes the boric acid liner inside producing water vapor and end fitting. The CMU power fuse unit is then discarded, and replacedboric anhydride which helps to de-ionize the arc. The by-products with a new unit, re-using the end fittings if undamaged
extinguish the arc at a natural current zero and exit out the bottomof the fuse. During the interrupting process, current continues to flow in the circuit and in the fuse until a current zero is reached. When the arc isThe arcing rod is prevented from falling back into its original position stopped at current zero, the voltage will attempt to re-ignite the arc
by residual force in the compression spring, whose free length is The voltage across the fuse terminals builds rapidly and is referredgreater than the available space within the fuse unit. When the fuse to as the Transient Recovery Voltage (TRV). The TRV is the mostoperates, the upward motion of the spring forces the top of the severe waveform the fuse will have to withstand. This voltage build-arcing rod to penetrate the upper seal, striking the latch mechanism. up puts a great deal of potentially destructive force on the fuse unitsOn indoor applications, this action causes the blown fuse indicator and the system in total. Whether or not extinguishing of the arc isto actuate. On outdoor installations, the latch releases the fuse successful depends, in general, on the dielectric strength betweenunit allowing the ejector spring to move the assembly outward the fuse terminals. In short, the dielectric strength between the fuseand swing through a 180 degree arc into a dropout position. This terminals must be greater than the voltage trying to re-ignite the arcdropout action provides immediate visual indication that the fuse for a successful interruption to occur
has operated. When the fuse is blown and the dropout actioncompleted, the entire unit is removed with a hotstick. When properly applied, the CMU power fuse has a dielectric withstand that is greater than the TRV, regardless of theWhen replacing the blown fuse, the end fittings should be removed fault current
www.eaton.com/cooperpowerseries 3 Catalog Data CA132038EN CMU medium voltage power fusesEffective September 2019 Table 1. CMU Catalog Numbers and Information Voltage Min. Melt Curve Max. Clear Curve Max Approx. Indoor Outdoor Rating Rating Catalog Reference Reference Int. Shipping End Fittings End Fittings Speed A Numbers R240-91- R240-91- kA Sym Wt. Catalog Number Catalog Number 3 CMU702003 6 CMU702006 8 CMU702008 10 CMU702010 12 CMU702012 15 CMU702015 20 CMU702020 25 CMU702025 17 kV, K 153 156 14 2.1 CMU3097 CMU3095 30 CMU702030 40 CMU702040 50 CMU702050 65 CMU702065 80 CMU702080 100 CMU702100 140 CMU702140 200 CMU702200 5 CMU612005 7 CMU612007 10 CMU612010 13 CMU612013 15 CMU612015 20 CMU612020 25 CMU612025 30 CMU612030 17 kV, E 40 CMU612040 152 155 14 2.1 CMU3097 CMU3095 std 50 CMU612050 65 CMU612065 80 CMU612080 100 CMU612100 125 CMU612125 150 CMU612150 175 CMU612175 200 CMU612200 15 CMU712015 20 CMU712020 25 CMU712025 30 CMU712030 40 CMU712040 50 CMU712050 17 kV, SE 65 CMU712065 151 154 14 2.1 CMU3097 CMU3095 slow 80 CMU712080 100 CMU712100 125 CMU712125 150 CMU712150 175 CMU712175 200 CMU712200NNote: Muffler can be ordered separately. Order catalog number CMUFDA1103
4 www.eaton.com/cooperpowerseries CMU medium voltage power fuses Catalog Data CA132038EN Effective September 2019 Table 1. CMU Catalog Numbers and Information (continued) Voltage Min. Melt Curve Max Clear Curve Max Approx. Indoor Outdoor Rating Catalog Reference Reference Int. Shipping End Fittings End Fittings Speed Rating A Numbers R240-91- R240-91- kA Sym Wt. Catalog Number Catalog Number 3 CMU703003 6 CMU703006 8 CMU703008 10 CMU703010 12 CMU703012 15 CMU703015 20 CMU703020 25 CMU703025 27 kV, K 153 159 12.5 2.1 CMU3097 CMU3095 30 CMU703030 40 CMU703040 50 CMU703050 65 CMU703065 80 CMU703080 100 CMU703100 140 CMU703140 200 CMU703200 5 CMU613005 7 CMU613007 10 CMU613010 13 CMU613013 15 CMU613015 20 CMU613020 25 CMU613025 30 CMU613030 27 kV, std 40 CMU613040 152 158 12.5 2.1 CMU3097 CMU3095 50 CMU613050 65 CMU613065 80 CMU613080 100 CMU613100 125 CMU613125 150 CMU613150 175 CMU613175 200 CMU613200 15 CMU713015 20 CMU713020 25 CMU713025 30 CMU713030 40 CMU713040 50 CMU713050 27 kV, SE 65 CMU713065 151 157 12.5 2.1 CMU3097 CMU3095 slow 80 CMU713080 100 CMU713100 125 CMU713125 150 CMU713150 175 CMU713175 200 CMU713200NNote: Muffler can be ordered separately. Order catalog number CMUFDA1103
www.eaton.com/cooperpowerseries 5 Catalog Data CA132038EN CMU medium voltage power fusesEffective September 2019 Table 1. CMU Catalog Numbers and Information (continued) Voltage Min. Melt Curve Max Clear Curve Max Approx. Indoor Outdoor Rating Rating Catalog Reference Reference Int. Shipping End Fittings End Fittings Speed A Numbers R240-91- R240-91- kA Sym Wt. Catalog Number Catalog Number 3 CMU704003 6 CMU704006 8 CMU704008 10 CMU704010 12 CMU704012 15 CMU704015 20 CMU704020 25 CMU704025 38 kV, K 153 159 10 2.8 CMU3097 CMU3095 30 CMU704030 40 CMU704040 50 CMU704050 65 CMU704065 80 CMU704080 100 CMU704100 140 CMU704140 200 CMU704200 5 CMU614005 7 CMU614007 10 CMU614010 13 CMU614013 15 CMU614015 20 CMU614020 25 CMU614025 30 CMU614030 38 kV, E 40 CMU614040 152 158 10 2.8 CMU3097 CMU3095 std 50 CMU614050 65 CMU614065 80 CMU614080 100 CMU614100 125 CMU614125 150 CMU614150 175 CMU614175 200 CMU614200 15 CMU714015 20 CMU714020 25 CMU714025 30 CMU714030 40 CMU714040 50 CMU714050 38 kV, SE 65 CMU714065 151 157 10 2.8 CMU3097 CMU3095 slow 80 CMU714080 100 CMU714100 125 CMU714125 150 CMU714150 175 CMU714175 200 CMU714200NNote: Muffler can be ordered separately. Order catalog number CMUFDA1103
6 www.eaton.com/cooperpowerseries CMU medium voltage power fuses Catalog Data CA132038EN Effective September 2019Construction The bottom indoor fitting is threaded to accept a muffler attachment for limiting noise and contamination to indoor equipment. The mufflerThe complete fuse consists of the fuse unit, end fittings, and a is constructed of a plated steel housing containing copper meshmounting. screening. This copper mesh absorbs and contains the noise and exhaust materials of the fuse during a fault condition. The mufflerCMU end fittings helps prevent contamination of components and mechanisms within the switchgear. This containment action also avoids accidental flash-End fittings are required to complete the electrical connection over from phase-to-phase or phase-to-ground by limiting airbornebetween the fuse unit and the mounting. End fittings are positioned particles and gases
on the top and bottom of the fuse unit. They can be used over againif they remain undamaged
Outdoor fittingsEnd fittings are available in two versions: indoor and outdoor
Outdoor end fittings are made of a cast-copper plated alloy. A large hookeye on the upper fitting allows for easy installation into pole-Indoor fittings top mountings with a hotstick. The pivotal design of this hookeyeThe indoor end fittings are composed of high-impact plastic and high provides for proper engagement of the upper mounting. In the eventconducting copper alloy. The blown fuse indicator, located on the top of a fault, the arcing rod will penetrate through the upper end of theend fitting, provides visual indication of an operated fuse unit. The fuse and cause the latch to release. Once released, the fuse willsilver-plated contact rod ensures positive conductivity between the rotate down to the drop-out position to indicate a blown-fuse
fuse and the mounting. The positive locking action of the latch mechanism preventsThe spring-loaded plastic mounting handle actuates the latch detachment from the mounting due to shock or vibration. Themechanism when engaged into the mounting. It readily accepts a lower end fitting has two cylindrical posts that insert into the lowerhotstick to install or remove the assembled fuse. mounting, serving as the axis to rotate the fuse into the engaged position, and to suspend the fuse during a blown, drop-out condition
A locating pin in the upper fitting assures proper alignment andengagement with the fuse. The cast bottom indoor fitting has alocating slot on the inside bore, which aligns with a locating pin onthe lower section of the fuse for proper alignment. Two pivotal slotsare formed into the fitting for insertion into the mount
Blown-Fuse Indicator (in blown- fuse position)* Contact Rod Clamp screw Locating Pin Clamp (inside bore) Screw Locating Pin (inside bore) Locating slot (inside bore) Locknut Clamp Upper Seal Locating Slot Clamp Actuating Pin - extends through screw Upper Seal when Locating Slot Upper Seal Fuse Unit is blown Actuating and extends the Pin - extends Blown- Fuse Indicator through Upper Locating Slot Seal when Fuse Unit is blown and extends the Blown- Fuse Indicator Lower Ferrule Colored End Cap (remove and discard before installing Muffler) Locating Pin Lower Ferrule Colored End Cap should NOT Shoulder be removed Locating Pin Muffler when CMU power fuse unit is used in out- door mountingFigure 4. Indoor CMU power fuse fuse fittings. Figure 5. Outdoor CMU power fuse fittings
Upper End Fitting www.eaton.com/cooperpowerseries 7 Lower Catalog Data CA132038EN CMU medium voltage power fusesEffective September 2019 .944 Table 2. TRV Characteristics DIA. .72 REF
Primary Faults Secondary Faults Test Circuit - Test Circuit - Normal Normal Frequency TRV Frequency TRV Recovery Natural TRV Recovery Natural TRV 1.244 Fuse Rating Voltage, Frequency, Amplitude Voltage, Frequency, Amplitude DIA. kV Normal kV rms Kc Factor kV rms Kc Factor A B 14.4 17.1 5.5 1.6 14.4 17 1.7 25 27 5.5 1.6 27 13 1.7 34.5 38 3.9 1.6 38 6.5 1.7 Table 3. CMU Power Fuse Short-Circuit Interrupting Ratings Dimensions in Inches MVA, Interrupting kV, Nominal Amperes, Interrupting (Three-Phase Symmetrical) Rating A B Symmetrical 17.1 kV 19.08 19.41 based on Where CMU System X/R = 15 Asymmetrical X/R = 15 27.0 kV 22.58 22.91 7.2 175 38.0 kV 28.76 29.09 4.8 / 8.32Y 200 7.2 / 12.47Y 300 17 7.62 / 13.2Y 14000 22400 320 .944 .72 REF
DIA. 13.8 335 14.4 350 16.5 400 1.244 DIA. 7.2 / 12.47Y 270 7.62 / 13.2Y 285 A B 13.8 300 REF. C 14.4 310 27 16.5 12500 20000 365 23.0 500 14.4 / 24.9Y 540 20 / 34.5Y1 – 23.0 – 14.4 / 24.9Y – Dimensions in Inches 27.6 475 Rating A B C 38 10000 16000 20 / 34.5Y 600 17.1 kV 19.08 27.19 28.82 34.5 600 27.0 kV 22.58 30.69 32.32 1 Applies to 23 kV single-insulator style only, for protection of single-phase-to-neutral circuits (line or transformers) 38.0 kV 28.76 36.87 38.50 and three-phase transformers or banks with solidly grounded neutral connections
Figure 6. Outdoor (top) and indoor (bottom)dimensions
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Printed in USA For Eaton's Cooper Power series product Publication No. CA132038EN All other trademarks are property information call 1-877-277-4636 or visit: September 2019 of their respective owners. www.eaton.com/cooperpowerseries
CMU Catalog Numbers and Information Voltage Rating Speed Rating A Catalog Numbers Min. Melt Curve Reference R240-91-Max. Clear Curve Reference R240-91-Max Int. kA Sym …
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Frequently Asked Questions
What is the voltage of the eaton medium voltage expulsion fuses?
EATON CORPORATION1 Medium Voltage Expulsion Fuses Product FocusIndoor and Outdoor RBA, RDB, DBU, DBA 8.3kV - 145kV CA01303001E May 2002 1 For more information visit: www.cutler-hammer.eaton.com Contents Description Page Introduction................................................... 2
What is the kv max of the fuse unit?
Fuse Unit Fittings kV Max. A B 17 19.08 19.41 27 22.58 22.91 38 28.76 29.09 Fuse Mounting (Dimensions in Inches) kV Catalog kV Max. Number BIL A B C D E F G H J K L M 17 DBU17-GDML** 95 22.50 18.44 30.50 19.25 14.25 9.25 18.44 9.44 11.50 3.0 9.50 3.75
What is the application data for cutler hammer expulsion power fuses?
application data pertains only to expulsion fuses. For information on the application of current- limiting fuses see the Cutler Hammer Current Limiting Fuse Catalog. General Information Expulsion Power Fuses are divided into two types “Refillable” and “Replaceable”. Refillable fuses are constructed so that the inner components can be removed and
What are the different configurations of the power fuse?
The DBU Power Fuse is offered in 3 configurations for use with high currents: “E” (Standard), “K” (Fast) and “SE” (Slow). The curves for the “SE” are less inverse and allow for