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KLSR Series
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KLSR001 - Littelfuse KLSR001 - Littelfuse KLSR001.T, UL CLASS RK1 FAST-ACTING FUSE, Voltage: 600/250, Amp Size:1

KLSR001 - Littelfuse KLSR001.T, UL CLASS RK1 FAST-ACTING FUSE, Voltage: 600/250, Amp Size:1

Usually Ships in 3 to 5 Days
Price: $36.03
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KLSR002 - Littelfuse KLSR002 - Littelfuse KLSR002.T, UL CLASS RK1 FAST-ACTING FUSE, Voltage: 600/250, Amp Size:2

KLSR002 - Littelfuse KLSR002.T, UL CLASS RK1 FAST-ACTING FUSE, Voltage: 600/250, Amp Size:2

Usually Ships in 3 to 5 Days
Price: $36.03
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KLSR003 - Littelfuse KLSR003 - Littelfuse KLSR003.T, UL CLASS RK1 FAST-ACTING FUSE, Voltage: 600/250, Amp Size:3

KLSR003 - Littelfuse KLSR003.T, UL CLASS RK1 FAST-ACTING FUSE, Voltage: 600/250, Amp Size:3

Usually Ships in 3 to 5 Days
Price: $36.03
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KLSR004 - Littelfuse KLSR004 - Littelfuse KLSR004.T, UL CLASS RK1 FAST-ACTING FUSE, Voltage: 600/250, Amp Size:4

KLSR004 - Littelfuse KLSR004.T, UL CLASS RK1 FAST-ACTING FUSE, Voltage: 600/250, Amp Size:4

Usually Ships in 3 to 5 Days
Price: $36.03
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KLSR005 - Littelfuse KLSR005 - Littelfuse KLSR005.T, UL CLASS RK1 FAST-ACTING FUSE, Voltage: 600/250, Amp Size:5

KLSR005 - Littelfuse KLSR005.T, UL CLASS RK1 FAST-ACTING FUSE, Voltage: 600/250, Amp Size:5

Usually Ships in 3 to 5 Days
Price: $36.03
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KLSR006 - Littelfuse KLSR006 - Littelfuse KLSR006.T, UL CLASS RK1 FAST-ACTING FUSE, Voltage: 600/250, Amp Size:6

KLSR006 - Littelfuse KLSR006.T, UL CLASS RK1 FAST-ACTING FUSE, Voltage: 600/250, Amp Size:6

Usually Ships in 3 to 5 Days
Price: $36.03
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KLSR008 - Littelfuse KLSR008 - Littelfuse KLSR008.T, UL CLASS RK1 FAST-ACTING FUSE, Voltage: 600/250, Amp Size:8

KLSR008 - Littelfuse KLSR008.T, UL CLASS RK1 FAST-ACTING FUSE, Voltage: 600/250, Amp Size:8

Usually Ships in 3 to 5 Days
Price: $36.03
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KLSR010 - Littelfuse KLSR010 - Littelfuse KLSR010.T, UL CLASS RK1 FAST-ACTING FUSE, Voltage: 600/250, Amp Size:10

KLSR010 - Littelfuse KLSR010.T, UL CLASS RK1 FAST-ACTING FUSE, Voltage: 600/250, Amp Size:10

Usually Ships in 3 to 5 Days
Price: $36.03
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KLSR012 - Littelfuse KLSR012 - Littelfuse KLSR012.T, UL CLASS RK1 FAST-ACTING FUSE, Voltage: 600/250, Amp Size:12

KLSR012 - Littelfuse KLSR012.T, UL CLASS RK1 FAST-ACTING FUSE, Voltage: 600/250, Amp Size:12

Usually Ships in 3 to 5 Days
Price: $36.03
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KLSR015 - Littelfuse KLSR015 - Littelfuse KLSR015.T, UL CLASS RK1 FAST-ACTING FUSE, Voltage: 600/250, Amp Size:15

KLSR015 - Littelfuse KLSR015.T, UL CLASS RK1 FAST-ACTING FUSE, Voltage: 600/250, Amp Size:15

Usually Ships in 3 to 5 Days
Price: $35.21
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KLSR020 - Littelfuse KLSR020 - Littelfuse KLSR020.T, UL CLASS RK1 FAST-ACTING FUSE, Voltage: 600/250, Amp Size:20

KLSR020 - Littelfuse KLSR020.T, UL CLASS RK1 FAST-ACTING FUSE, Voltage: 600/250, Amp Size:20

Usually Ships in 3 to 5 Days
Price: $35.21
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KLSR025 - Littelfuse KLSR025 - Littelfuse KLSR025.T, UL CLASS RK1 FAST-ACTING FUSE, Voltage: 600/250, Amp Size:25

KLSR025 - Littelfuse KLSR025.T, UL CLASS RK1 FAST-ACTING FUSE, Voltage: 600/250, Amp Size:25

Usually Ships in 3 to 5 Days
Price: $35.21
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KLSR030 - Littelfuse KLSR030 - Littelfuse KLSR030.T, UL CLASS RK1 FAST-ACTING FUSE, Voltage: 600/250, Amp Size:30

KLSR030 - Littelfuse KLSR030.T, UL CLASS RK1 FAST-ACTING FUSE, Voltage: 600/250, Amp Size:30

Usually Ships in 3 to 5 Days
Price: $35.21
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KLSR035 - Littelfuse KLSR035 - Littelfuse KLSR035.T, UL CLASS RK1 FAST-ACTING FUSE, Voltage: 600/300, Amp Size:35

KLSR035 - Littelfuse KLSR035.T, UL CLASS RK1 FAST-ACTING FUSE, Voltage: 600/300, Amp Size:35

Usually Ships in 3 to 5 Days
Price: $75.94
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KLSR040 - Littelfuse KLSR040 - Littelfuse KLSR040.T, UL CLASS RK1 FAST-ACTING FUSE, Voltage: 600/300, Amp Size:40

KLSR040 - Littelfuse KLSR040.T, UL CLASS RK1 FAST-ACTING FUSE, Voltage: 600/300, Amp Size:40

Usually Ships in 3 to 5 Days
Price: $75.94
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KLSR045 - Littelfuse KLSR045 - Littelfuse KLSR045.T, UL CLASS RK1 FAST-ACTING FUSE, Voltage: 600/300, Amp Size:45

KLSR045 - Littelfuse KLSR045.T, UL CLASS RK1 FAST-ACTING FUSE, Voltage: 600/300, Amp Size:45

Usually Ships in 3 to 5 Days
Price: $75.94
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KLSR050 - Littelfuse KLSR050 - Littelfuse KLSR050.T, UL CLASS RK1 FAST-ACTING FUSE, Voltage: 600/300, Amp Size:50

KLSR050 - Littelfuse KLSR050.T, UL CLASS RK1 FAST-ACTING FUSE, Voltage: 600/300, Amp Size:50

Usually Ships in 3 to 5 Days
Price: $75.94
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KLSR060 - Littelfuse KLSR060 - Littelfuse KLSR060.T, UL CLASS RK1 FAST-ACTING FUSE, Voltage: 600/300, Amp Size:60

KLSR060 - Littelfuse KLSR060.T, UL CLASS RK1 FAST-ACTING FUSE, Voltage: 600/300, Amp Size:60

Usually Ships in 3 to 5 Days
Price: $75.94
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KLSR070 - Littelfuse KLSR070 - Littelfuse KLSR070.V, UL CLASS RK1 FAST-ACTING FUSE, Voltage: 600/300, Amp Size:70

KLSR070 - Littelfuse KLSR070.V, UL CLASS RK1 FAST-ACTING FUSE, Voltage: 600/300, Amp Size:70

Usually Ships in 3 to 5 Days
Price: $157.03
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KLSR080 - Littelfuse KLSR080 - Littelfuse KLSR080.V, UL CLASS RK1 FAST-ACTING FUSE, Voltage: 600/300, Amp Size:80

KLSR080 - Littelfuse KLSR080.V, UL CLASS RK1 FAST-ACTING FUSE, Voltage: 600/300, Amp Size:80

Usually Ships in 3 to 5 Days
Price: $157.03
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KLSR090 - Littelfuse KLSR090 - Littelfuse KLSR090.V, UL CLASS RK1 FAST-ACTING FUSE, Voltage: 600/300, Amp Size:90

KLSR090 - Littelfuse KLSR090.V, UL CLASS RK1 FAST-ACTING FUSE, Voltage: 600/300, Amp Size:90

Usually Ships in 3 to 5 Days
Price: $157.03
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KLSR100 - Littelfuse KLSR100 - Littelfuse KLSR100.V, UL CLASS RK1 FAST-ACTING FUSE, Voltage: 600/300, Amp Size:100

KLSR100 - Littelfuse KLSR100.V, UL CLASS RK1 FAST-ACTING FUSE, Voltage: 600/300, Amp Size:100

Usually Ships in 3 to 5 Days
Price: $157.03
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KLSR110 - Littelfuse KLSR110 - Littelfuse KLSR110.X, UL CLASS RK1 FAST-ACTING FUSE, Voltage: 600/300, Amp Size:110

KLSR110 - Littelfuse KLSR110.X, UL CLASS RK1 FAST-ACTING FUSE, Voltage: 600/300, Amp Size:110

Usually Ships in 3 to 5 Days
Price: $296.65
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KLSR125 - Littelfuse KLSR125 - Littelfuse KLSR125.X, UL CLASS RK1 FAST-ACTING FUSE, Voltage: 600/300, Amp Size:125

KLSR125 - Littelfuse KLSR125.X, UL CLASS RK1 FAST-ACTING FUSE, Voltage: 600/300, Amp Size:125

Usually Ships in 3 to 5 Days
Price: $296.65
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KLSR150 - Littelfuse KLSR150 - Littelfuse KLSR150.X, UL CLASS RK1 FAST-ACTING FUSE, Voltage: 600/300, Amp Size:150

KLSR150 - Littelfuse KLSR150.X, UL CLASS RK1 FAST-ACTING FUSE, Voltage: 600/300, Amp Size:150

Usually Ships in 3 to 5 Days
Price: $296.65
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KLSR175 - Littelfuse KLSR175 - Littelfuse KLSR175.X, UL CLASS RK1 FAST-ACTING FUSE, Voltage: 600/300, Amp Size:175

KLSR175 - Littelfuse KLSR175.X, UL CLASS RK1 FAST-ACTING FUSE, Voltage: 600/300, Amp Size:175

Usually Ships in 3 to 5 Days
Price: $296.65
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KLSR200 - Littelfuse KLSR200 - Littelfuse KLSR200.X, UL CLASS RK1 FAST-ACTING FUSE, Voltage: 600/300, Amp Size:200

KLSR200 - Littelfuse KLSR200.X, UL CLASS RK1 FAST-ACTING FUSE, Voltage: 600/300, Amp Size:200

Usually Ships in 3 to 5 Days
Price: $296.65
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KLSR225 - Littelfuse KLSR225 - Littelfuse KLSR225.X, UL CLASS RK1 FAST-ACTING FUSE, Voltage: 600/300, Amp Size:225

KLSR225 - Littelfuse KLSR225.X, UL CLASS RK1 FAST-ACTING FUSE, Voltage: 600/300, Amp Size:225

Usually Ships in 3 to 5 Days
Price: $586.36
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KLSR250 - Littelfuse KLSR250 - Littelfuse KLSR250.X, UL CLASS RK1 FAST-ACTING FUSE, Voltage: 600/300, Amp Size:250

KLSR250 - Littelfuse KLSR250.X, UL CLASS RK1 FAST-ACTING FUSE, Voltage: 600/300, Amp Size:250

Usually Ships in 3 to 5 Days
Price: $586.36
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KLSR300 - Littelfuse KLSR300 - Littelfuse KLSR300.X, UL CLASS RK1 FAST-ACTING FUSE, Voltage: 600/300, Amp Size:300

KLSR300 - Littelfuse KLSR300.X, UL CLASS RK1 FAST-ACTING FUSE, Voltage: 600/300, Amp Size:300

Usually Ships in 3 to 5 Days
Price: $586.36
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KLSR Series

KLSR series RK1 fuses were the earliest type of current-limiting fuse 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, KLSR series fuses must be greatly oversized to prevent opening the fuses on harmless inrush currents. In such applications, KLSR series fuses may only provide short-circuit protection.

We recommend using POWR-PRO™ LLNRK/LLSRK series RK1, dual-element, time-delay fuses in all new applications requiring the current-limiting ability of UL Class RK1 fuses, or 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 for KLNR dimensions and FLSR for KLSR dimensions.