UL Fuse Classification Chart


UL CLASS FUSE OVERLOAD CHARACTERISTICS INTERRUPTING RATING, AMPERES AC VOLTAGE RATING AVAILABLE AMPERE RATINGS LITTELFUSE SERIES NUMBER BUSSMAN SERIES NUMBER EDISON SERIES NUMBER
L TIME-DELAY 200,000 600* 200 - 6000
601 - 4000
200 - 2000
KLPC
KLLU
LDC
KRPC
KLU
n/a
n/a
LCL
n/a
RK1*** TIME-DELAY 200,000 250
600
1/10  - 600 LLNRK
LLSRK
LPNRK
LPSRK
LENRK
LLSRK
RK1*** FAST-ACTING 200,000 250
600
1 - 600 KLNR
KLSR
KTNR
KTSR
NCLR
SCLR
RK5 TIME-DELAY 200,000 250 35 - 600 FLNR-ID FRNR
ECNR
RK5 TIME-DELAY 200,000 250 1/10 - 600
FLNR FRNR
ECNR
RK5 TIME-DELAY 200,000 600 1/10 - 600
FLSR & FLSR-ID
IDSR
FRSR
ECSR
T FAST-ACTING 200,000 300**
600
1 - 1200
1 - 1200
JLLN**
JLLS
JJN
JJS
TJN
TJS
J TIME-DELAY 200,000 600 8/10 - 600 JTD & JTD-ID LPJ
JDL
J FAST-ACTING 200,000 600 1 - 600 JLS JKS
JFL
CC TIME-DELAY 200,000 600 1/10 - 30
1/5 - 30
KLDR
CCMR (formerly KLMR)
FNQR
LPCC
HCTR
EDCC
CC FAST-ACTING 200,000 600 1/10-30 KLKR KTKR
HCLR
CD TIME-DELAY 200,000 600 35 - 60 CCMR LPCC
EDCC
G TIME-DELAY 100,000 480* 1/2 - 60 SLC SC
SEC
K5 FAST-ACTING 50,000 250
600
1 - 600 NLN
NLS
NON
NOS
KON
KOS
H RENEWABLE FUSES FAST-ACTING 10,000 250
600
1 - 600 RLN
RLS
REN
RES
ERN
ERS

* LDC rated 600 volts AC/DC
** JLLN Class T is UL Listed at 300 volts
*** RK1 Class fuses are Ultra-Fast Clearing