NCLR CLASS RK1 FAST-ACTING FUSES SCLR CLASS RK1 FAST ...

NCLR CLASS RK1 FAST-ACTING FUSES
SCLR CLASS RK1 FAST-ACTING FUSES
Catalog Number NCLR (1 - 600A) 250 Volts AC or Less
Catalog Number SCLR (1 - 600A) 600 Volts AC or Less
AMPERE RATINGS
NCLR 250V
1 10 35 80 175 400
3 12 40 90 200 450
4 15 45 100 225 500
5 20 50 110 250 600
6 25 60 125 300 —
8 30 70 150 350 —
SCLR 600V
1 8 30 70 150 350
2 10 35 80 175 400
3 12 40 90 200 450
4 15 45 100 225 500
5 20 50 110 250 600
6 25 60 125 300 —
NCLR/SCLR SPECIFICATIONS
Fast-Acting
Voltage Rating:
Ampere Rating:
Interrupting Rating:
Current Limiting:
NCLR - 250VAC, SCLR - 600VAC
1 - 600 Amps
200,000 RMS Symmetrical Amps
RK1 Fuse
Agency Approvals:
UL Listed, Class RK1, Guide JDDZ, File E162363
CSA Certified HRCI-R per C22.2, No. 248.12
Self-Certified DC Ratings:
Voltage Rating: NCLR (1-600) 250VDC
SCLR (1-600) 300VDC
Interrupting Rating: NCLR/SCLR 10,000 Amperes DC
BENEFITS:
• No intentional time-delay; opens quickly on overload current.
• Extremely current limiting silver link construction; provides
superior component circuit protection.
APPLICATIONS:
• Recommended for protection on non-inductive loads such
as lighting and resistance heating circuits.
• Use to protect lower interrupting rating circuit breakers in
series rated applications.
RECOMMENDED FUSEBLOCKS:
Refer to page 136 in this catalog.
RECOMMENDED UPGRADE:
LENRK/LESRK.
CROSS REFERENCE
VOLTS EDISON BUSSMANN GOULD LITTELFUSE
250 NCLR KTN-R A2KR KLNR
600 SCLR KTS-R A6KR* KLSR*
* Larger body size on blade type.
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NCLR CLASS RK1 FAST-ACTING FUSES
SCLR CLASS RK 1 FAST-ACTING FUSES
Application:
Edison NCLR/SCLR Class RK1 fast acting fuses are recommended
for general power distribution system use for main,
feeder and branch circuits having a high percentage of noninductive
loads such as heating and lighting. NCLR/SCLR
fuses are suitable for circuit breaker protection.* When
NCLR/SCLR fast acting fuses are used for inductive loads,
the fuses usually require oversizing to override normal transient
current surges of motors and transformers. Oversizing
fuses usually increases fuse and equipment cost and
reduces overcurrent protection. (For inductive loads,
LENRK/LESRK fuses are recommended). NCLR/SCLR
Class RK1 fast acting fuses are physically interchangeable
with other Class R fuses. They will replace Class K or Class
H fuses in standard fuse clips.
*When used as recommended by a specific circuit breaker manufacturer for a
specific application.
AVERAGE TIME/CURRENT CURVE
Cat. No. NCLR (Amp) 250V and SCLR (Amp) 600V
300
30A
60A
100A
200A
200
100
80
60
40
30
20
10
8
6
4
TIME IN SECONDS
3
2
1
.8
.6
.4
.3
.2
.1
.08
.06
.04
.03
.02
.01
40
60
80
100
200
300
400
600
800
1,000
2,000
3,000
4,000
6,000
8,000
10,000
400A
600A
AMPERE
RATING
RMS SYMMETRICAL CURRENT IN AMPERES
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PEAK LET-THROUGH CURRENT CURVES*
NCLR CLASS RK1 FAST-ACTING FUSES
SCLR CLASS RK1 FAST-ACTING FUSES
NCLR (250V)
SCLR (600V)
400,000
B
400,000
B
300,000
300,000
INSTANTANEOUS PEAK LET-THRU CURRENT IN AMPS
200,000
100,000
80,000
60,000
50,000
40,000
30,000
20,000
10,000
8,000
6,000
5,000
4,000
3,000
A
2,000
AMPERE
RATING
600
400
200
100
60
30
INSTANTANEOUS PEAK LET-THRU CURRENT IN AMPS
200,000
100,000
80,000
60,000
50,000
40,000
30,000
20,000
10,000
8,000
6,000
5,000
4,000
3,000
A
2,000
AMPERE
RATING
600
400
200
100
60
30
1,000
1,000
2,000
3,000
4,000
5,000
6,000
8,000
10,000
20,000
30,000
40,000
50,000
60,000
80,000
100,000
RMS SYMMETRICAL CURRENTS IN AMPERES
A–B=ASYMMETRICAL AVAILABLE PEAK (2.3 X SYMM RMS AMPS)
200,000
1,000
1,000
2,000
3,000
4,000
5,000
6,000
8,000
10,000
20,000
30,000
40,000
50,000
60,000
80,000
100,000
RMS SYMMETRICAL CURRENTS IN AMPERES
A–B=ASYMMETRICAL AVAILABLE PEAK (2.3 X SYMM RMS AMPS)
200,000
*Curves test data obtained at 15% short-circuit power factor when possible.
CURRENT LIMITATION TABLES**
NCLR (250V)
NCLR – RMS & Peak Let-Thru Currents (kA)
Prosp. Fuse Size
Short 30 60 100 200 400 600
C.C. I RMS I p I RMS I p I RMS I p I RMS I p I RMS I p I RMS I p
5,000 1 2 1 3 2 4 3 6 5 10 5 12
10,000 1 2 1 3 2 5 3 8 6 14 8 19
15,000 1 3 2 4 2 6 4 9 7 17 10 22
20,000 1 3 2 4 3 6 4 10 8 19 11 25
25,000 1 3 2 5 3 7 4 10 9 20 12 27
30,000 1 3 2 5 3 7 5 11 10 22 13 29
35,000 1 3 2 5 3 8 5 12 10 23 13 31
40,000 1 3 2 5 3 8 5 12 10 24 14 32
50,000 2 4 2 5 4 9 6 13 11 26 15 36
60,000 2 4 2 6 4 9 6 14 12 28 17 38
70,000 2 4 3 6 4 9 6 15 13 29 17 40
80,000 2 4 3 6 4 10 7 15 13 30 18 42
90,000 2 4 3 6 5 10 7 16 13 31 19 44
100,000 2 4 3 7 5 11 7 17 14 32 20 46
150,000 2 5 3 7 5 13 8 19 16 37 23 53
200,000 2 5 3 8 6 14 9 21 18 41 26 59
SCLR (600V)
SCLR – RMS & Peak Let-Thru Currents (kA)
Prosp. Fuse Size
Short 30 60 100 200 400 600
C.C. I RMS I p I RMS I p I RMS I p I RMS I p I RMS I p I RMS I p
5,000 1 2 1 3 2 4 3 6 5 12 5 12
10,000 1 2 2 4 2 5 4 8 7 15 9 20
15,000 1 3 2 4 3 6 4 10 8 18 11 24
20,000 1 3 2 5 3 7 5 11 9 20 12 28
25,000 1 3 2 5 3 7 5 12 10 22 13 31
30,000 1 3 2 5 3 8 5 13 10 24 14 33
35,000 2 4 2 5 4 8 6 13 11 25 15 35
40,000 2 4 2 6 4 9 6 14 11 26 16 37
50,000 2 4 3 6 4 9 6 14 12 28 17 40
60,000 2 4 3 6 4 10 7 15 13 30 19 43
70,000 2 4 3 7 5 10 7 16 14 32 20 45
80,000 2 4 3 7 5 11 7 17 14 33 21 48
90,000 2 5 3 7 5 12 8 18 15 35 22 50
100,000 2 5 3 7 5 12 8 19 16 36 23 52
150,000 2 5 4 8 6 14 9 21 18 41 26 60
200,000 3 6 4 9 7 15 10 23 20 46 29 66
*"Apparent Let-Thru Amperes" values are read from "Peak Let-Through Current Curves" and the peak current value divided by 2.3
Asymmetry Factor.
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