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Technical content
Product description: Cable limiters are intended to provide short-circuit protection to electrical systems, typically between the transformer and service entrance. Should a short-circuit occur, the cable limiter removes the affected cable(s) from service and permits the other conductors to continue delivering power. Cable limiters are often used in utility low voltage networks and large multi-cable per phase service entrances. Unlike fuses, cable limiters are selected by cable size rather than amp rating, e.g., a “4/0” limiter will carry the current of a 4/0 cable. Limiters are stable, totally self-contained, static devices with unchanging characteristics that operate without venting ionized gases or explosive action. Under high short-circuit conditions, limiters cut off fault currents within one-half cycle (0.008 second) and reduce insulation damage from the immense heat that is developed by sustained fault current flow. They confine damage to the point of the short-circuit and stop long-length cable burn-back and striking of multiple arcs. This minimizes or eliminates damage to adjacent conductors. Features and benefits:
- Cable limiters enhance multi-conductor system reliability by isolating faulted conductors and taking them offline while the balance of the conductors continue delivering power to their circuits. This is why cable limiters are often used in utility low voltage networks and large multi-cable per phase service entrances.
- Cable limiters enhance service entrance conductor short-circuit protection with current- limiting performance that exceed the typical protection offered by utility overcurrent protective devices.
- Cable limiters meet many system requirements with 250 Vac or 600 Vac ratings for conductor sizes from 12 AWG to 1000 kcmil and terminal options available that make them easy to install including:
- Tube-to-tube (crimp)
- Tube-to-offset bolt (crimp/bolt-in)
- Tube-to-center bolt (crimp/bolt-in)
- Compression rod-to-tube (crimp)
- Bolt-to-offset bolt (bolt-in)
- Select cable limiters are UL Listed under File E90818 for use on 600 V circuit for protection against faults up to 200 kA.
250 V and 600 V cable limiters
Eaton.com/bussmannseries
250 V UH Series
- UH__
Applications
- The 250 Vac UH cable limiters are designed specifically for use in residential applications. Ratings
- Volts: up to 250 Vac
- Interrupting rating: 100 kA, RMS Sym. T erminals
- Center bolt-to-offset bolt — copper or aluminum conductors Conductors
- Copper or aluminum conductors are permitted per the listed cable size. Select the catalog number for the system conductor size in the table below. Dimensions — in (mm) Catalog no. Copper cable size Aluminum cable size A1 A2 B C D E F G H I C A1 FB A2 E D E I G H Bolt terminal detail
Eaton.com/bussmannseries T ube-to-tube terminals:
- Copper or aluminum conductor — see catalog number table for details Catalog number Copper cable size Aluminum cable size A B C D E * UL Listed, File E90818, 600 Vac, 200 kA IR. † Available with shrink tube “–V” suffix. †† Available with molded rubber boot “-B” suffix. Order catalog no. “KCM-B. ” Boot can be purchased separately, order Part# - BOOT-KCM B AAC E D
600 V K Series
- K__
The 600 Vac K cable limiters are designed for use on non-residential 277/480, 120/208 and 120/240 volt systems. Ratings
- Volts: up to 600 Vac
- Interrupting rating: 200 kA, RMS Sym. Agency information
- UL Listed, File E90818, 600 Vac, 200 kA IR on catalog numbers CDA-W, CDB-W, KCD, KCJ, KCM, KCM-B, KCR, KDD, KDF , KDJ, KDM, KDP , KDR, KDU, KEW, KFM, KFT , KHF , KHJ, KHM, KHR Dimensions — in (mm) Available terminals
- Tube-to-tube
- Tube-to-offset bolt
- Compression rod-to-tube
- Center bolt-to-offset bolt
- Center bolt-to-tube Conductors
- Copper or aluminum based upon terminal style and perrmitted conductor material. See catalog number tables for details Compression rod-to-tube terminals
- Copper conductor only Catalog no. Copper cable size A B C D E F G Dimensions — in (mm) G D F E CBA
Eaton.com/bussmannseries T ube-to-offset bolt terminals:
- Copper or aluminum conductor — see catalog number table for details Catalog symbol Copper cable size Aluminum cable size A B C D E F G H J * UL Listed, File E90818, 600 Vac, 200 kA IR. † Available with molded rubber boot “-B” suffix. Boot can be purchased separately, order Part# - BOOT-KDM †† Available with shrink tube “–V” suffix. AC E D B F G H J 1.63" (41.3mm) 0.56" (14.3mm) 0.56" (14.3mm) 0.125" (3.18mm) Bolt terminal detail Dimensions — in (mm) C A FB A 0.25" (6.4mm) D 0.25" (6.4mm) 1.63" (41.3mm) 0.56" (14.3mm) 0.56" (14.3mm) 0.125" (3.18mm) Bolt terminal detail E Center bolt-to-offset bolt terminals
- Copper or aluminum conductor — see catalog number table for details Catalog no. Copper cable size Aluminum cable size A B C D E F * UL Listed for copper only, File E90818, 600 Vac, 200 kA IR. Dimensions — in (mm) Center bolt-to-tube terminals
- Copper conductor only Catalog no. Copper cable size A B C D E F G H * UL Listed for copper only, File E90818, 600 Vac, 200 kA IR. Dimensions — in (mm) G D F E CBAH 1.63 (41.3) 0.56 (14.3) 0.56 (14.3) 0.125 (3.18) Bolt terminal detail Ø 0.56 (14.3)
Follow us on social media to get the latest product and support information. The only controlled copy of this data sheet is the electronic read-only version located on the Eaton network drive. All other copies of this document are by definition uncontrolled. This bulletin is intended to clearly present comprehensive product data and provide technical information that will help the end user with design applications. Eaton reserves the right, without notice, to change design or construction of any products and to discontinue or limit distribution of any products. Eaton also reserves the right to change or update, without notice, any technical information contained in this bulletin. Once a product has been selected, it should be tested by the user in all possible applications. Eaton and Bussmann are valuable trademarks of Eaton in the U.S. and other countries. Y ou are not permitted to use the Eaton trademarks without prior written consent of Eaton. UL is a registered trademark of the Underwriters Laboratories, Inc. Eaton
1000 Eaton Boulevard
Cleveland, OH 44122 Eaton.com Bussmann Division
114 Old State Road
Ellisville, MO 63021 United States Eaton.com/bussmannseries © 2019 Eaton All Rights Reserved Printed in USA Publication No. 1042 — BU-SB14632 February 2019 Peak let-through current Time-current characteristics - total clear 100 1000 10,000 30,000 0.1 0.01 100
12 AWG
10 AWG
8 AWG
4 AWG
3 AWG
2 AWG
1 AWG
6 AWG
B A 400 1000 10,000 100,000 200,000 1000 kcmil 750 kcmil 500 kcmil 350 kcmil 250 kcmil 4/0 AWG 1/0 AWG 100,000 10,000 1000 100 3/0 AWG 2/0 AWG Prospective Short-Circuit Current Symmetrical RMS Amps Instantaneous Peak Let-Through Current in Amps Cable Size