General Purpose Fuses
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
General Purpose Fuses
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
• Reduced damage to equipment caused by heating and magnetic
forces of short-circuits.
• Equipment runs cooler with low-resistance dual-element fuses.
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.
Specifications
Voltage Ratings:
AC: 250 Volts (FLNR)
600 Volts (FLSR)
DC: 125 Volts (FLNR)
300 Volts (FLSR)
AC: 200,000 amperes rms symmetrical
DC: 20,000 amperes
1
⁄
10
– 600 amperes
Standard 248-12, Class RK5
UL Listed (File No: E81895)
CSA Certified (File No: LR29862)
MSHA 300 Volt Listing (FLSR)
QPL: Federal Specification WF-1814
Ampere Ratings
6
⁄
10
⁄
10
1
8
⁄
10
4
8
1
8
1
⁄
8
⁄
10
2
4 ⁄
2
9
15
1
⁄
100
1
2 ⁄
4
5
10
2
⁄
10
1
1
⁄
8
2
1
⁄
2
5
6
⁄
10
12
1
1
8
⁄
4
1 ⁄
4
2 ⁄
10
6
15
3
**
4
1
⁄
10
1 ⁄
10
3
6 ⁄
4
17
1
⁄
2
4
1
2
⁄
10
1 ⁄
2
3 ⁄
10
7
20
1
6
1
1
⁄
2
1 ⁄
10
3 ⁄
2
7 ⁄
2
25
**FLNR only,
Example part number (series & amperage): FLSR100
1
Interrupting Ratings:
Ampere Range:
Approvals:
30
35
40
45
50
60
70
75
80
90
100
110
125
150
175
200
225
250
300
350
400
450
500
600
Recommended Fuse Blocks
LR250 series (for FLNR series fuses)
LR600 series (for FLSR series fuses)
Refer to Blocks & Holders section of this catalog for additional information.
Dimensions
Refer to FLNR_ID series for FLNR dimensions and FLSR_ID series for FLSR
dimensions.
© 2005 Littelfuse
•
POWR-GARD
™
Products Catalog
www.littelfuse.com
33
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