Technical Data 1042
Effective October 2016
Supersedes December 2015
250 V and 600 V cable limiters
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 250Vac or 600Vac
ratings for conductor sizes from 12AWG to
1000kcmil and terminal options available that
make them easy to install including: tube-
to-tube (crimp), tube-to-bolt (crimp/bolt-in),
compression rod-to-tube (crimp) and bolt-to-
offset bolt (bolt-in) options.
Select cable limiters are UL
®
Listed under
File E90818 for use on 600V circuit for the
protection of faults up to 200kA.
•
•
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 volt-
age networks and large multi-cable per phase
service entrances.
Unlike fuses, cable limiters are selected by
cable size rather than amperage, 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 of ionized gases or
explosive action.
Under high short-circuit conditions, limiters
cut off fault currents within one-half cycle
(0.008 seconds) 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 to minimize damage to or
eliminate damage to adjacent conductors.
•
Technical Data 1042
Effective October 2016
Cable limiters
250V UH Series
Catalog Symbol: UH__
Applications:
•
The 250 Vac UH cable limiters are deisnged specifically for
use in residentail applications.
Ratings:
•
•
Volts: up to 250 Vac
Interrupting Rating: 100 kA, RMS Sym.
Terminals:
•
Center bolt-to-offset bolt — copper or aluminum conductors
Conductors:
•
Copper or aluminum conductors are permitted per the listed
cable size. Select the catalog symbol for the system conductor
size in the table below.
Dimensions - in (mm
)
H
C
A
1
B
A
2
F
Bolt
terminal
detail
B
C
D
E
G
D
E
Catalog Copper
numbers cable size
UHA
UHJ-M
UHJ-T
UHJ-W
3/0 AWG
350 kcmil
600 kcmil
E
Aluminum
cable size A
1
1.06 (27.0)
1.53 (38.9)
1.53 (38.9)
1.53 (38.9)
250 kcmil
500 kcmil
800 kcmil
I
A
2
F
G
H
0.69 (17.5)
0.69 (17.5)
0.69 (17.5)
I
0.56 (14.3)
0.56 (14.3)
0.56 (14.3)
2/0-3/0 AWG 4/0 AWG
1.19 (30.2) 1.44 (36.5) 1.00 (25.4) 0.75 (19.0) 0.12 (3.2)
1.75 (44.4) 1.59 (40.5) 1.50 (38.1) 1.00 (25.4) 0.25 (6.3)
1.75 (44.4) 1.59 (40.5) 1.50 (38.1) 1.00 (25.4) 0.25 (6.3)
1.75 (44.4) 1.59 (40.5) 1.50 (38.1) 1.00 (25.4) 0.25 (6.3)
0.56 (14.3) 0.19 (4.8)
0.87 (22.2) 0.34 (8.6)
0.87 (22.2) 0.34 (8.6)
0.87 (22.2) 0.34 (8.6)
0.59 (15.1) 0.41 (10.3)
2
Eaton.com/bussmannseries
Cable limiters
Technical Data 1042
Effective October 2016
600V K Series
Catalog Symbol: K__
Applications:
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.
KCD, KCJ, KCM, KCR, KDM, KDR, KDP and KFM cable limiters
are UL Listed under File E90818 for only copper conductors.
Tube-to-tube
Tube-to-offset bolt
Compression rod-to-tube
Center bolt-to-offset bolt
Agency information:
•
Terminals:
•
•
•
•
Conductors:
•
Copper only on:
•
Tube-to-tube
•
•
Tube-to-offset bolt
Compression rod-to-tube
•
Copper or aluminum on
•
Center bolt-to-offset bolt
Terminals:
•
Tube-to-tube — copper conductor only
Dimensions - in (mm)
C
E
D
Catalog
symbol
KCY
KCZ
KCA
KCB
KCC
KCD*,
KCE
KCF
KCH
KCJ*
KCV
KCR*,
KCS
†
†
†
††
†
A
B
A
Copper
cable size
4AWG
3AWG
2AWG
1AWG
1/0AWG
2/0AWG
3/0AWG
4/0AWG
250kcmil
350kcmil
500kcmil
600kcmil
750kcmil
1000kcmil
A
1.25 (31.8)
1.25 (31.8)
1.25 (31.8)
1.25 (31.8)
1.5 (38.1)
1.63 (41.3)
1.63 (41.3)
1.75 (44.5)
1.88 (47.6)
2.0 (50.8)
2.88 (73.0)
3.5 (88.9)
3.5 (88.9)
5.0 (127.0)
B
2.88 (73.0)
2.88 (73.0)
2.88 (73.0)
2.88 (73.0)
2.625 (66.7)
2.625 (66.7)
3.63 (92.1)
3.63 (92.1)
3.63 (92.1)
3.63 (92.1)
3.08 (78.2)
3.08 (78.2)
3.75 (95.25)
3.75 (95.25)
C
1.06 (27.0)
1.06 (27.0)
1.06 (27.0)
1.06 (27.0)
1.25 (31.8)
1.25 (31.8)
1.44 (36.5)
1.44 (36.5)
1.44 (36.5)
1.63 (41.3)
1.88 (47.6)
1.88 (47.6)
2.5 (63.5)
2.5 (63.5)
D
0.31 (7.9)
0.34 (8.7)
0.44 (11.1)
0.47 (11.9)
0.52 (13.1)
0.44 (14.3)
0.61 (15.5)
0.34 (17.5)
0.75 (19.0)
0.88 (22.2)
1.06 (27.0)
1.155 (29.3)
1.31 (33.3)
1.56 (39.7)
E
0.25 (6.4)
0.28 (7.1)
0.31 (7.9)
0.34 (8.7)
0.39 (9.9)
0.70 (11.1)
0.48 (12.3)
0.55 (14.0)
0.59 (15.0)
0.70 (17.9)
0.83 (21.0)
0.92 (23.4)
1.06 (27.0)
1.22 (31.0)
KCM*, ,
* UL Listed, File E90818, 600Vac, 200kA I.R.
† Available with shrink tube “–V” suffix.
†† Available with molded rubber boot “-B” suffix. Boot can be purchased separately, order Part# - BOOT-KCM
Eaton.com/bussmannseries
3
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