RK5 Dual Element Time-Delay Fuses
These fuses are recommended for AC power
distribution system mains, feeders and
branch circuits having inductive loads
(motors, transformers) or non-inductive
loads (lighting, heating) where the available
short-circuit current does not exceed
200,000 RMS symmetrical amperes. These "dual element, time-delay" fuses have
minimum industry standard time-delay of
10 seconds at 5 times the fuse rating (8 sec.
minimum for 250V, 30A and less). The timedelay
characteristics of these fuses typically
allows them to be sized closer to the running
ampacity of inductive loads to reduce cost
and provide improved overcurrent
protection. These fuses will override normal
equipment current surges to reduce
unnecessary fuse openings. They are the
most popular fuses used in the industry and
the most economical for most applications,
especially motors and transformers. They
have moderate current limitation.
CLASS R FUSES WILL FIT CLASS H, K AND
R FUSE CLIPS. CLASS R FUSE CLIPS WILL
ONLY ACCEPT CLASS R FUSES. FUSES
RATED 600 VOLTS AC OR LESS MAY BE
APPLIED AT ANY LOWER VOLTAGE.
RK1 Dual Element Time-Delay Fuses
The application recommended for these
fuses is exactly the same as for the Edison
ECNR/ECSR fuses except for the advantages
of greater current limitation. The Edison
LENRK/LESRK fuses have up to 40% more
current limitation and up to 350% more
Amps-Squared-Second (I2t) limitation under
fault conditions than Edison ECNR/ECSR
fuses to reduce potential for damage. In
addition, LENRK/LESRK fuses allow better
selectivity for electrical power system
designers and better short circuit protection
for breakers having inadequate interrupting
ratings. ECNR/ECSR and LENRK/LESRK fuse
lines are physically interchangeable (and
electrically interchangeable per U.L.
equipment listing conditions) and are
recommended as a practical, economical
way to upgrade systems for many situations.
SPECIFICATIONS Voltage Rating: ECNR and LENRK: 250 Vac
ECSR and LESRK: 600 Vac
Ampere Rating: ECNR and ECSR: 0.1 to 600 A
LENRK and LESRK: 0.2 to 600 A
Interrupting Rating: 200,000 RMS
symmetrical amps
LENRK and LESRK Self-Certified
Interrupting Rating: 300,000 RMS
symmetrical amps
Current Limiting: ECNR and ECSR: RK5 fuse
LENRK and LESRK: RK1 fuse
Agency Approvals: UL Listed, Class RK5
and RK1, Guide JDDZ, File E162363; CSA
Certified HRCI-R per C22.2, No. 248.12
Self-Certified DC Ratings: Voltage Rating: ECNR (0.1 to 600)
125 Vdc; ECSR (0.1 to 600) 300 Vdc;
LENRK (0.2 to 600) 125 Vdc; LESRK
(0.25 to 30) 200 Vdc; (35 to 600)
300 Vdc
Interrupting Rating: ECNR and ECSR: 20,000 amperes DC
LENRK and LESRK: 20,000 amperes DC
注: Comes with instruction sheet. Ordering Example: (1) ECNR1 1 amp fuse, ¥2,560 plus (1) LENRK10 10 amp fuse, ¥3,175, ¥2,560 + 3,175 = ¥5,735
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