Bussmann
®
Limitron
®
Fast-Acting Fuses
250 Volt
Dimensional Data
2"
(± 0.31)
.56" (± 0.008)
1/10A to 30A
KTN-R
1-600A
3"
(± 0.31)
.81" (± 0.008)
35A to 60A
5.88"
(± 0.062)
1.06" (± 0.008)
70A to 100A
7.13"
(± 0.062)
1.56" (± 0.008)
110A to 200A
Catalog Symbol:
KTN-R (250V)
Fast-Acting
Current-Limiting
Ampere Rating:
1 to 600A
Voltage Rating:
250 ac Vac (or less)*
Interrupting Rating:
200,000A RMS Sym.
Tube Material:
Glass Melamine
End Caps:
70/30 Brass
Operating Temp.:
–40°C to +85°C
Storage Temp.:
–55°C to +85°C
Agency Information:
UL Listed, Std. 248-12, Class RK1, Guide JDDZ, File E54273
CSA Certified, C22.2 No. 248.12, Class 1422-02, File 53787
*0-600A is rated 250Vdc and 10 KAIC.
8.63"
(± 0.094)
2.06" (± 0.008)
225A to 400A
10.38"
(± 0.094)
2.59" (± 0.008)
450A to 600A
Carton Quantity and Weight (250Vac)*
Amps
1–30
40–60
70–100
110–200
225–400
Carton
Qty.
10
10
5
1
1
Weight**
Lbs.
0.45
1.82
1.85
1.05
2.38
3.50
Kg.
0.204
0.824
0.838
0.476
1.078
1.587
Catalog Numbers
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-75
KTN-R-80
KTN-R-90
KTN-R-100
KTN-R-110
KTN-R-125
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
450–600
1
*Contact Bussmann for dc ratings.
**Weight per carton.
CE logo denotes compliance with European Union Low Voltage Directive
(50-1000Vac, 75-1500Vdc). Refer to Data Sheet: 8002 or contact
Bussmann Application Engineering at 314-527-1270 for more information.
Recommended fuseblocks for
Class R 250V fuses
See Data Sheet: 1110
General Information:
• 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.
• LIMITRON fuses are 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 fuseholders. Thus, can physically and
electrically replace fast-acting Class H, K1, K5, RK5, and
other fast-acting fuses.
10-2-02
SB02295
Form No. KTN-R
Page 1 of 2
Data Sheet: 1043
Bussmann
®
Limitron
®
Fast-Acting Fuses
250 Volt
Current-Limitation Curves
400,000
INSTANTANEOUS PEAK LET-THROUGH CURRENT IN AMPS
B
100A
200A
400A
600A
AMPERE
RATING
30A
60A
KTN-R
1-600A
Time-Current Characteristic Curves–Average Melt
300
AMPERE
RATING
100,000
100
600
400
200
100
10,000
60
30
10
A
100,000
200,000
1,000
10,000
1,000
TIME IN SECONDS
1
RMS SYMMETRICAL CURRENTS IN AMPERES
A–B=ASYMMETRICAL AVAILABLE PEAK (2.3 x SYMM RMS AMPS)
Class R (600V) Catalog Data
(Clip Retaining Spring Standard, Suffix “R”)
Terminal Type (Suffix No.)
Basic
Catalog
Number
Screw w/
—
Pres.
Plate
PR
PR
PR
PR
PR
PR
PR
PR
PR
—
—
—
—
—
—
—
—
—
Box Lug w/
—
CR
CR
CR
CR
CR
CR
CR
CR
CR
CR
CR
CR
CR
CR
CR*
CR
CR
CR
Clip
CU only
COR
COR
COR
COR
COR
COR
COR
COR
COR
COR
COR
COR
COR
COR
COR*
COR*
—
—
1/4
Quick
Connect
QR*
QR*
QR*
QR*
QR*
QR*
—
—
—
—
—
—
—
—
—
—
—
—
.1
Amps
Poles
⁄Ω¡º
1
R25030-1
SR
to
2
R25030-2
SR
30
3
R25030-3
SR
⁄Ω¡º
1
R25030-1
SR
to
2
R25030-2
SR
30
3
R25030-3
SR
1
1
R25060-1
SR*
to
2
R25060-2
SR*
60
3
R25060-3
SR*
61
1
R25100-1
—
to
2
R25100-2
—
100
3
R25100-3
—
101
1
R25200-1
—
to
3
R25200-3
—
200
201
1
R25400-1
—
to
3
R25400-3
—
400
401
1
R25600-1
—
to
3
R25600-3
—
600
*UL Recognized, No CSA Certification.
.01
10,000
Form No. KTN-R
Page 2 of 2
Data Sheet: 1043
RMS SYMMETRICAL CURRENT IN AMPERES
The only controlled copy of this Data Sheet is the electronic read-only version located on the 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. Bussmann reserves the right, without notice, to change
design or construction of any products and to discontinue or limit distribution of any products. 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.
10-2-02
SB02295
1,000
100
40