LIMITRON⢠Class RK1 250V
LIMITRON™ Class RK1 250V KTN-R — 250Vac, 1-600A, Fast-Acting Fuses Dimensions – in
10.38" (± 0.094)
2" (± 0.31) 0.56" (± 0.008)
2.59" (± 0.008)
1/10 to 30A 450 to 600A
8.63" (± 0.094)
3" (± 0.31) 0.81" (± 0.008) 35 to 60A
2.06" (± 0.008) 225 to 400A
5.88" (± 0.062)
7.13" (± 0.062) 1.06" (± 0.008)
Description: Advanced protection Class RK1 current-limiting, fast-acting fuses.
70 to 100A
1.56" (± 0.008) 110 to 200A
CSA Certified, C22.2 No. 248.12, Class 1422-02, File 53787
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 fastacting fuses.
Catalog Numbers (amps)
Recommended Fuse Blocks
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
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
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 Quantity and Weight (250Vac)* Amp Rating 1–30 40–60 70–100 110–200 225–400 450–600
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
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
60A 100A 200A 200A 400A 600A
Desired Fuse (Case) Size
Catalog Numbers (Pairs) 250V
30A 30A 60A 60A
NO.263-R NO.213-R NO.216-R NO.226-R
100A 100A 200A 100A 200A 400A
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
LIMITRON™ Class RK1 250V KTN-R — 250Vac, 1-600A, Fast-Acting Fuses
600A
400A
200A
100A
60A
30A
Time-Current Curves - Average Melt
300
AMP RATING
100
TIME IN SECONDS
10
1
RMS SYMMETRICAL CURRENT IN AMPS
0713
BU-SB13739
Page 2 of 3
10,000
1,000
100
0.01
40
0.1
Data Sheet # 1043
LIMITRON™ Class RK1 250V KTN-R — 250Vac, 1-600A, Fast-Acting Fuses Current-Limitation Curves B AMP RATING
100,000
600 400 200 100 10,000
60 30
10,000
200,000
1,000
100,000
A
1,000
INSTANTANEOUS PEAK LET-THROUGH CURRENT IN AMPS
400,000
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
BU-SB13739
Page 3 of 3
Data Sheet # 1043
10.38" (± 0.094)
2" (± 0.31) 0.56" (± 0.008)
2.59" (± 0.008)
1/10 to 30A 450 to 600A
8.63" (± 0.094)
3" (± 0.31) 0.81" (± 0.008) 35 to 60A
2.06" (± 0.008) 225 to 400A
5.88" (± 0.062)
7.13" (± 0.062) 1.06" (± 0.008)
Description: Advanced protection Class RK1 current-limiting, fast-acting fuses.
70 to 100A
1.56" (± 0.008) 110 to 200A
CSA Certified, C22.2 No. 248.12, Class 1422-02, File 53787
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 fastacting fuses.
Catalog Numbers (amps)
Recommended Fuse Blocks
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
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
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 Quantity and Weight (250Vac)* Amp Rating 1–30 40–60 70–100 110–200 225–400 450–600
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
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
60A 100A 200A 200A 400A 600A
Desired Fuse (Case) Size
Catalog Numbers (Pairs) 250V
30A 30A 60A 60A
NO.263-R NO.213-R NO.216-R NO.226-R
100A 100A 200A 100A 200A 400A
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
LIMITRON™ Class RK1 250V KTN-R — 250Vac, 1-600A, Fast-Acting Fuses
600A
400A
200A
100A
60A
30A
Time-Current Curves - Average Melt
300
AMP RATING
100
TIME IN SECONDS
10
1
RMS SYMMETRICAL CURRENT IN AMPS
0713
BU-SB13739
Page 2 of 3
10,000
1,000
100
0.01
40
0.1
Data Sheet # 1043
LIMITRON™ Class RK1 250V KTN-R — 250Vac, 1-600A, Fast-Acting Fuses Current-Limitation Curves B AMP RATING
100,000
600 400 200 100 10,000
60 30
10,000
200,000
1,000
100,000
A
1,000
INSTANTANEOUS PEAK LET-THROUGH CURRENT IN AMPS
400,000
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
BU-SB13739
Page 3 of 3
Data Sheet # 1043
