KLNR Datasheet, PDF (1/2 Pages) Littelfuse – General Purpose Fuses

General Purpose Fuses
KLNR/KLSR Class RK1 Fuses
250/600 VAC  •  Fast Acting  •  1 – 600 Amperes
KLNR/KLSR series RK1 fuses were the earliest type of current-limiting
fuses developed. Their single-element, silver link design enables them
to provide fast-acting overload and short-circuit pro­tec­tion. When used
to protect inductive loads such as motors, solenoids, and trans­form­ers,
KLNR/KLSR series fuses must be greatly oversized to prevent opening
the fuses on harmless in-rush currents. In such applications, KLNR/
KLSR series fuses may only provide short-circuit pro­tec­tion.
We recommend using POWR-PRO^® LLNRK/LLSRK series Class RK1,
dual-element, time-de­lay fuses in all new applications re­quir­ing the
current-limiting ability of UL Class RK1 fuses. POWR-PRO LLNRK/
LLSRK series fuses are also recommended in existing applications
where fast-acting RK1 or RK5 fuses have been open­ing on harmless
system surges such as motor start­ing currents.
Applications
Resistance heaters
Lighting circuits
Non-inductive loads
Molded case circuit breaker load centers and panelboards have
increased in­ter­rupt­ing ratings when series rated with Littelfuse
KLNR/KLSR Class RK1 fuses. Refer to panelboard manufacturer’s
literature for UL Listed com­bi­na­tion of fuses and panelboards. Series
ratings up to 200,000 amperes are available.
Safety
• 200,000 A.I.R. — Reliable interruption of all overcurrents up to
200,000 amperes.
• Extremely current-limiting — Stops dam­ag­ing short-circuit current
faster than any mechanical pro­tec­tive device.
• Fast-acting — Provides fast acting protection to equipment such
as variable speed drives, rectifiers and other equip­ment containing
surge-sensitive com­po­nents.
Longer Equipment Life
• Current-limiting design reduces damage to equip­ment caused by
heating and magnetic effects of short-circuit currents.
Economical
• Extremely current-limiting — often permits use of readily available,
less costly equipment.
• Used as input or output fuses for surge sensitive com­po­nents such
as variable speed drives and rectifiers, fast acting KLNR/KLSR fuses
may prevent opening of ex­pen­sive semiconductor fuses protecting
individual components.
Easy To Use
• 200,000 A.I.R. rating min­i­miz­es need for short-circuit calculations.
Dimensions
• Refer to FLNR_ID for KLNR dimensions and FLSR_ID for KLSR
dimensions.
Specifications
Voltage Ratings: AC: 250 Volts (KLNR); 600 Volts (KLSR)
DC: 125 Volts (1 – 600A KLNR);
250 Volts (1 – 30A KLSR);
300 Volts (35 – 600A KLSR).
In­ter­rupt­ing Ratings: AC: 200,000 amperes rms sym­met­ri­cal
DC: 20,000 amperes
Ampere Range: 1 – 600 amperes.
Approvals: AC: Standard 248-12, Class RK1
UL Listed (File No: E81895)
CSA Certified (File No: LR29862)
DC: Littelfuse self-certified
Ampere Ratings
1
10
40
2
12
45
3
15
50
4
20
60
5
25
70
6
30
80
8
35
90
100
250
110
300
125
350
150
400
175
450
200
500
225
600
Example part number (series & amperage): KLNR 200
Recommended Fuse Blocks
LR250 series (for KLNR series fuses)
LR600 series (for KLSR series fuses)
Refer to the Blocks & Holders section of this catalog for additional in­for­ma­tion.
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© 2005 Littelfuse • POWR-GARD^™ Products Catalog