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Limitron® fast-acting, RK1 – 250 volt fuses
Catalog symbol - KTN-R-(amps)

Advanced protection Class RK1 current-limiting,
fast-acting fuses.

• Volts:   
  • 250 Vac   
  • 250 Vdc (70-350 A)   
• Amps - 1-600 A 
• Interrupting rating:  
  • 200 kA Vac RMS Sym.
  • 100 kA Vdc

Agency Information
• UL® Listed, Std. 248-12, Guide JDDZ,
  File E54273 
• CSA® Certified, Class 1422-02, File 53787 
• CE

• Provides 10X better current limitation to help
  prevent equipment damage caused by
  short-circuit events 
• 200 kA interrupting rating complies with
  NEC® Section 110.9 for today’s large capacity
• Fast-acting fuse helps prevent equipment
  damage caused by short-circuit events  
• Incorporates Class R rejection feature. Can
  be inserted in non-rejection type fuse holders
  to physically and electrically replace Class H,
  K1, K5, and other fast-acting fuses 
• Ideal for critical industrial or commercial
  applications that have specific current
  limitation requirements
Catalog numbers
KTN-R-1 KTN-R-30 KTN-R-125
KTN-R-2 KTN-R-35 KTN-R-150
KTN-R-3 KTN-R-40 KTN-R-175
KTN-R-4 KTN-R-45 KTN-R-200
KTN-R-5 KTN-R-50 KTN-R-225
KTN-R-6 KTN-R-60 KTN-R-250
KTN-R-8 KTN-R-70 KTN-R-300
KTN-R-10 KTN-R-75 KTN-R-350
KTN-R-12 KTN-R-80 KTN-R-400
KTN-R-15 KTN-R-90 KTN-R-450
KTN-R-20 KTN-R-100 KTN-R-500
KTN-R-25 KTN-R-110 KTN-R-600

Carton quantity and weight (250 vac)*
Amps Carton qty
1-30 10
40-60 10
70-100 5
110-200 1
225-400 1
450-600 1
*Contact Eaton’s Bussmann Division for DC ratings.

Dimensions – in :

Recommended fuse blocks and holders:

Fuse amps 1-Pole 2-Pole 3-Pole
0-30 HM25030-1 HM25030-2 HM25030-3
0-30 RM25030-1 RM25030-2 RM25030-3
35-60 HM25060-1 HM25060-2 HM25060-3
35-60 RM25060-1 RM25060-2 RM25060-3
70-100 RM25100-1CR RM25100-2CR RM25100-3CR
110-200 RM25200-1CR RM25200-1CR RM25200-1CR
225-400 RM25400-1CR RM25400-1CR RM25400-1CR
450-600 RM25600-1CR RM25600-1CR RM25600-1CR

For additional information on 250 volt blocks, see data sheet 
No. 10289 (RM250) and (HM250) and product brochure 
No. 3192 (RM style).

Fuse reducers for Class R fuses - 250 V
Equipment fuse clips Desired fuse (case) Size Catalog symbol (pairs)
60A 30A NO.263-R
100A 30A NO.213-R
100A 60A NO.216-R
200A 60A NO.226-R
200A 100A NO.2621-R
400A 100A NO.2641-R
400A 200A NO.242-R
600A 100A NO.2661-R
600A 200A NO.2662-R
600A 400A NO.2664-R†

† Single reducer only (pair not required).

Time-current curves — average melt