LITTELFUSE LLSRK6, LLSRK56-10, LLSRK500, LLSRK50, LLSRK45 Datasheet
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LLNRK/LLSRK Series POWR-PRO® Class RK1
250/600 VAC ■ Dual-Element, Time-Delay ■ 1/10 – 600 Amperes
SPECIFICATIONS
Voltage Ratings: AC: 250 Volts (LLNRK)
600 Volts (LLSRK)
DC: 125 Volts (LLNRK)
300 Volts (LLSRK)
Interrupting Ratings:
AC: 200,000 amperes rms symmetrical 300,000 amperes rms symmetrical (Littelfuse self-certified)
DC: 20,000 amperes
Ampere Range: 1/10 – 600 amperes
Approvals: AC: Standard 248-12, Class RK1
UL Listed (File No: E81895)
CSA Certified (File No: LR29862)
QPL: Federal Specification No.WF-1814
DC: Littelfuse self-certified
AMPERE RATINGS
⁄ |
1 |
2 ⁄10 |
6 ⁄4 |
25 |
90 |
300 |
||
1 |
10 |
1 ⁄8 |
8 |
1 |
30 |
100 |
350 |
|
|
⁄ |
3 |
7 |
|||||
15 |
100 |
1 |
3 ⁄10 |
8 |
35 |
110 |
400 |
|
⁄ |
1 ⁄4 |
|||||||
2 |
10 |
1 |
2 |
|
|
|
|
|
1⁄4 * |
14⁄10 |
31⁄2 |
9 |
40 |
125 |
450 |
||
3⁄10 |
16⁄10 |
4 |
10 |
45 |
150 |
500 |
||
4⁄10 |
18⁄10 |
41⁄2 |
12 |
50 |
175 |
600 |
||
1⁄2 |
2 |
5 |
15 |
60 |
200 |
|
||
6⁄10 |
21⁄4 |
56⁄10 |
171⁄2 |
70 |
225 |
|
||
8⁄10 |
21⁄2 |
6 |
20 |
80 |
250 |
|
||
* LLSRK Only.
Example part number (series & amperage): LLNRK 450
RECOMMENDED FUSE BLOCKS
LR250 series (LLNRK Series)
LR600 series (LLSRK Series)
Refer to Fuse Block section of this catalog for additional information.
Littelfuse LLNRK and LLSRK series POWR-PRO® fuses provide superior overload and short circuit protection for service entrance, main, feeder and general-purpose branch circuits up to 600 amperes.
LLNRK/LLSRK series fuses can be installed in existing Class H fuse blocks to upgrade systems containing lower interrupting rating Class H one-time or renewable fuses.
APPLICATIONS
All general-purpose circuits
Motors
Transformers
Solenoids
Fluorescent lighting
All system components with high in-rush currents
FEATURES/BENEFITS
■Extremely current limiting — Reduces damage to circuits and equipment under short-circuit conditions. Stops damaging short circuits faster than any mechanical protective device.
■300kA Interrupting Rating — Littelfuse self-certified to 300,000 amperes as standard. Meets future trend towards higher available short circuit currents.
■Reduced costs — Current limiting design often permits use of readily available, less costly equipment. Low resistance design reduces power consumption and utility bills.
■Excellent time delay — True dual-element construction, with separate non-fatiguing thermally-reversible springloaded thermal overload element, withstands repeated surges within rated time delay without opening needlessly. Eliminates needless downtime caused by power surges or equipment demands.
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