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FLNR/FLSR Class RK5 Fuses
250/600 VAC • Dual-Element, Time-Delay • 1/10 – 600 Amperes
Applications
Service entrance switches
Switchboard main and feeder switches
Motor control center mains and motor branch circuits
Individual fused combination motor controllers
Distribution panelboards
Industrial control panels
Protection of fully rated panelboards and loadcenters
All general purpose circuits
Safety
• 200,000 A.I.R. — Reliable interruption of all overcurrents up to
200,000 amperes.
• Faster acting short-circuit protection than any non-current-limiting
mechanical protective device.
Reliability
Accurate and reliable — Automated, precision manufactured and
assembled parts ensure accurate, consistent response to overloads
and short-circuits.
Longer Equipment Life
Littelfuse FLNR/FLSR series fuses have been the superior UL Class
RK5 dual-element time-delay fuses, and are the most widely used class
of fuses. FLNR/FLSR series fuses provide excellent protection for all
types of circuits especially those containing motors. However, users and
specifiers should consider the significant benefits offered by Indicator
fuses. Complete information on these fuses may be found earlier in this
section.
Reduced damage to equipment caused by heating and magnetic
forces of short-circuits.
Equipment runs cooler with low-resistance dual-element fuses.
Specifications
Ampere Ratings
Voltage Ratings:
AC: 250 Volts (FLNR)
1 10
6 10
1 8 10
4
8
30
80
225
600 Volts (FLSR)
1 8
8 10
2
4 1 2
9
35
90
250
DC: 125 Volts (FLNR)
15 100
1
2 1 4
5
10
40
100
300
300 Volts (FLSR)
2 10
1 1 8
2 1 2
5 6 10
12
45
110
350
Interrupting Ratings:
AC: 200,000 a­peres r­s sy­­etrical
1 4
1 1 4
2 8 10
6
15
50
125
400
DC: 20,000 a­peres
3 10 **
1 4 10
3
6 1 4
17 1 2
60
150
450
Ampere Range:
1 10 – 600 a­peres
4 10
1 1 2
3 2 10
7
20
70
175
500
Approvals:
Standard 248-12, Class RK5
1 2
1 6 10
3 1 2
7 1 2
25
75
200
600
UL Listed (File No: E81895)
**FLNR only,
Exa­ple part nu­ber (series & a­perage): FLSR100
CSA Certified (File No: LR29862)
MSHA 300 Volt Listing (FLSR)
Recommended Fuse Blocks
QPL: Federal Specification WF-1814
Dimensions
LR250 series (for FLNR series fuses)
LR600 series (for FLSR series fuses)
Refer to Blocks & Holders section of this catalog for additional infor­ation.
Refer to FLNR_ID series for FLNR di­ensions and FLSR_ID series for FLSR
di­ensions.