POWR-GARD
®
Fuse Datasheet
© 2016 Littelfuse POWR-GARD
®
Products
Rev: 1-A-031716
littelfuse.com
2 of 3
CLASS RK1 – LLNRK • LLSRK • LLSRK_ID SERIES FUSES
SHORT CIRCUIT
CURRENT*
APPARENT RMS SYMMETRICAL CURRENT FOR VARIOUS FUSE RATINGS
3.5 A 5 A 12 A 30 A 100 A 200 A 400 A 600 A
5,000 196 251 427 586 1,764 2,821 - -
10,000 247 316 538 739 2,222 3,554 6,850 8,489
15,000 283 362 616 845 2,544 4,069 7,8 42 9,718
20,000 312 399 677 930 2,800 4,478 8,631 10,696
25,000 336 430 730 1,002 3,016 4,824 9,297 11,522
30,000 357 456 776 1,065 3,205 5,126 9,880 12,244
35,000 376 481 816 1,121 3,374 5,397 10,401 12,889
40,000 393 502 854 1,172 3,528 5,642 10,874 13,476
50,000 423 541 919 1,263 3,800 6,078 11,714 14,516
60,000 450 575 977 1,342 4,038 6,459 12,448 15,426
80,000 495 633 1,075 1,477 4,445 7,109 13,700 16,979
100,000 533 682 1,158 1,591 4,788 7,6 58 14,758 18,290
150,000 610 781 1,326 1,821 5,481 8,766 16,894 20,936
200,000 671 859 1,460 2,005 6,032 9,648 18,594 23,043
Current-Limiting Effects of LLSRK and LLSRK_ID (600 V) Fuses
SHORT CIRCUIT
CURRENT*
APPARENT RMS SYMMETRICAL CURRENT FOR VARIOUS FUSE RATINGS
30 A 60 A 100 A 200 A 400 A 600 A
5,000 900 1,400 2,000 2,700 4,800 5,000
10,000 1,100 1,900 2,700 3,500 6,200 8,500
15,000 1,250 2,100 3,100 4,200 7,000 9,500
20,000 1,400 2,400 3,500 4,600 8,000 10,800
25,000 1,500 2,600 3,900 5,000 8,300 11,500
30,000 1,600 2,800 4,000 5,250 9,000 12,000
35,000 1,700 2,850 4,300 5,500 9,500 12,500
40,000 1,800 3,000 4,600 5,800 9,800 13,500
50,000 1,900 3,200 4,800 6,300 10,200 14,000
60,000 2,000 3,500 5,200 6,700 11,000 15,000
80,000 2,200 3,900 5,700 7,2 00 12,200 16,000
100,000 2,300 4,000 6,000 8,100 12,700 17,000
150,000 2,500 4,500 6,700 9,100 14,000 19,000
200,000
2,600 4,800 7,000 9,700 15,000 20,000
*Prospective RMS Symmetrical Amperes Short-Circuit Current
Note: Data derived from Peak Let-Thru Curves
Current-Limiting Effects of LLNRK (250 V) Fuses
Blown Fuse Indicator Assembly
Granular Quartz Filling
Precision Formed Short Circuit Element
Fiberglass Reinforced Pultruded Body
Elastomeric Silicone Overload Section
Plated End Caps
LLSRK_ID Fuses—Quality Construction
for performance you can rely on…
Littelfuse LLSRK_ID Fuses feature true dual-element
construction. This robust design withstands
repeated surges within rated time delay
without opening needlessly, eliminating
downtime caused by power surges
or equipment demands.
