10
3
/4
1
13
/32
5
/8
5
/16
3
15
/32
1
1
/8
3
/4
3
13
/16
2
7
/8
5
3
/8
3
15
/32
3
/4
1
/8
3
/8
5
/8
1
3
/8
1
3
/8
1
/2
51
Class L
Application: Current limiting
protection for service entrance
equipment, feeder circuits and
metering centers.
Rejection: Its unique dimensions
prevent the substitution of another
fuse.
Fuse Ratings
Class L Blade Type 601-800A
Class L Blade Type 801-1200A
8
5
/8
21
/32
15
/16
3
/8
5
/8
1
1
/8
2
7
/16
3
13
/16
2
7
/16
1
/2
2
7
/8
4
5
/16
8
5
/8
Class T
Application: It combines two highly
desirable features—a high degree of
current limition and a small physical
size. Panelboards, Switchboards and
Metering Center.
Rejection: Its unique dimension
prevents the substitution of another
fuse
* Class K5 fuses do not prohibit the use of Class H type fuses in a switch.
Class Amperes Volts Dimensions Int. Ratings I2t, Ip Circuits
H 1-600A 250 and 600V NEC 10,000A Less than General purpose
or less AC standards – 10,000A available circuits
K5* 1-600A 250 and 600V Class H 100,000A I
2
t - RK5 up to 100A Feeder
or less AC without rejection I
p
- RK5 up to 100A circuits
J 1-600A 600V or less Diff. from 200,000A I
2
t - Low Main & feeder
Class H I
p
- Low circuits
RK1 1/10-600A 600V or less Class H with 200,000A I
2
t - Slightly>J Main & feeder
250V or less rejection I
p
- Slightly>J circuits(motor load
feature small percent)
RK5 1/10-600A 600V or less Class H with 200,000A I
2
t - >RK-1 Motor starting
(time 250V or less rejection I
p
- RK-1 currents
delay) feature
T 1-1200A 300V AC Diff. from 200,000A I
2
t - <J Main & feeder
Class H I
p
- <J circuits
T 1-800A 600V AC Diff. from 200,000A I
2
t - =J Main & feeder
Class H I
p
- =J circuits
L 601-6000A 600V or less Bolt type 200,000A I
2
t - Low Main & feeder
I
p
- Low circuits
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