L
IMITRON
™ Class RK1 250V
KTN-R — 250Vac, 1-600A, Fast-Acting Fuses
Dimensions – in
2"
(± 0.31)
0.56" (± 0.008)
1/10 to 30A
450 to 600A
10.38"
(± 0.094)
2.59" (± 0.008)
3"
(± 0.31)
0.81" (± 0.008)
35 to 60A
225 to 400A
8.63"
(± 0.094)
2.06" (± 0.008)
5.88"
(± 0.062)
1.06" (± 0.008)
7.13"
(± 0.062)
1.56" (± 0.008)
110 to 200A
Description:
Advanced protection Class RK1 current-limiting,
fast-acting fuses.
Catalog Symbol:
KTN-R-(amp)
Ratings:
Volts — 250Vac
— 250Vdc (70-600A)
Amps — 1-600A
IR — 200kA Vac RMS Sym.
— 100kA Vdc
Agency Information:
UL Listed, Std. 248-12, Class RK1, Guide JDDZ, File E4273
CSA Certified, C22.2 No. 248.12, Class 1422-02, File 53787
Catalog Numbers (amps)
KTN-R-1
KTN-R-2
KTN-R-3
KTN-R-4
KTN-R-5
KTN-R-6
KTN-R-8
KTN-R-10
KTN-R-12
KTN-R-15
KTN-R-20
KTN-R-25
Amp Rating
1–30
40–60
70–100
110–200
225–400
450–600
KTN-R-30
KTN-R-35
KTN-R-40
KTN-R-45
KTN-R-50
KTN-R-60
KTN-R-70
KTN-R-80
KTN-R-90
KTN-R-100
KTN-R-110
KTN-R-125
Carton Qty.
10
10
5
1
1
1
KTN-R-150
KTN-R-175
KTN-R-200
KTN-R-225
KTN-R-250
KTN-R-300
KTN-R-350
KTN-R-400
KTN-R-450
KTN-R-500
KTN-R-600
70 to 100A
Features:
• Single-element, fast-acting fuses with minimal time-delay
• Provides a high degree of short-circuit current-limitation
(component protection)
• Particularly suited for circuits and loads with no heavy surge
currents of motors, transformers, solenoids and welders
• Commonly used to protect circuit breakers with lower
interrupting ratings
• If used in circuits with surge currents (motors, etc.) must be
sized to prevent unwanted opening and thus only provide
short-circuit protection
• Incorporate Class R rejection feature. Can be inserted in
non-rejection type fuse holders to physically and electrically
replace fast-acting Class H, K1, K5, RK5, and other fast-
acting fuses.
Recommended Fuse Blocks
Fuse Amps
0-30
35-60
70-100
110-200
225-400
450-600
1-Pole
H25030-1
R25030-1
H25060-1
R25060-1
RM25100-1CR
RM25200-1CR
RM25400-1CR
RM25600-1CR
2-Pole
H25030-2
R25030-2
H25060-2
R25060-2
RM25100-2CR
RM25200-2CR
RM25400-2CR
RM25600-2CR
3-Pole
H25030-3
R25030-3
H25060-3
R25060-3
RM25100-3CR
RM25200-3CR
RM25400-3CR
RM25600-3CR
For additional information on 250 volt fuse blocks, see
Data Sheet # 1110 (R250) and # 1112 (H250) and product
brochure # 3192 (RM Series).
Fuse Reducers For Class R Fuses
Equipment
Fuse Clips
Desired Fuse
(Case) Size
Catalog Numbers
(Pairs) 250V
Carton Quantity and Weight (250Vac)*
60A
100A
200A
200A
400A
600A
30A
30A
60A
60A
100A
100A
200A
100A
200A
400A
NO.263-R
NO.213-R
NO.216-R
NO.226-R
NO.2621-R
NO.2641-R
NO.642-R
NO.2661-R
NO.2662-R
NO.2664-R
†
† Single reducer only (pair not required).
For additional information on Class R fuse reducers, see
Data Sheet 1118.
0713
BU-SB13739
Page 1 of 3
Data Sheet # 1043
L
IMITRON
™ Class RK1 250V
KTN-R — 250Vac, 1-600A, Fast-Acting Fuses
Current-Limitation Curves
B
AMP RATING
600
400
200
100
10,000
60
30
100,000
BU-SB13739
400,000
INSTANTANEOUS PEAK LET-THROUGH CURRENT IN AMPS
100,000
A
RMS SYMMETRICAL CURRENTS IN AMPS
A–B=ASYMMETRICAL AVAILABLE PEAK (2.3 x SYMM RMS AMPS)
The only controlled copy of this Data Sheet is the electronic read-only version located on the Cooper Bussmann Network Drive. All other copies of this document are by definition uncontrolled. This bulletin is
intended to clearly present comprehensive product data and provide technical information that will help the end user with design applications. Cooper Bussmann reserves the right, without notice, to change
design or construction of any products and to discontinue or limit distribution of any products. Cooper Bussmann also reserves the right to change or update, without notice, any technical information
contained in this bulletin. Once a product has been selected, it should be tested by the user in all possible applications.
0713
Page 3 of 3
Data Sheet # 1043
200,000
1,000
10,000
1,000
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