Fusetron®FRN-R
Dual-Element, Time-Delay Fuses 70-600A
Class RK5 – 250 Volt
Form No. FRN-R 70-600
Page 1 of 3
BIF Doc #1020
Bussmann®
11-1-00 A00115
70A to 100A
5.88"
(± 0.062) 1.06" (± 0.008)
110A to 200A
7.13"
(± 0.062) 1.56" (± 0.008)
225A to 400A
8.63"
(± 0.094) 2.06" (± 0.008)
450A to 600A
10.38"
(± 0.094) 2.59" (± 0.008)
Catalog Numbers
FRN-R-70 FRN-R-125 FRN-R-350
FRN-R-75 FRN-R-150 FRN-R-400
FRN-R-80 FRN-R-175 FRN-R-450
FRN-R-85 FRN-R-200 FRN-R-500
FRN-R-90 FRN-R-225 FRN-R-600
FRN-R-100 FRN-R-250 —
FRN-R-110 FRN-R-300 —
General Information:
• Provides motor overload, ground fault and short-circuit
protection.
• Helps protect motors against burnout from overloads and
single phasing when sized properly.
• Simplifies and improves blackout prevention (selective
coordination).
• Dual-element fuses can be applied in circuits subject to
temporary motor overloads and surge currents to provide
both high performance short-circuit and overload
protection.
• The overload element provides protection against low level
overcurrent of overloads and will hold on inrush current
which is five times greater than the ampere rating of the
fuse for a minimum of ten seconds.
Dimensional Data
Carton Quantity and Weight
Ampere Carton Weight*
Ratings Qty. Lbs. Kg.
70–100 5 1.5 0.680
101–200 1 0.77 0.349
201–400 1 1.52 0.689
401–600 1 3.0 1.4
*Weight per carton.
Fuse Reducers For Class R Fuses
Equipment Desired Fuse Catalog Number
Fuse Clips (Case) Size (Pairs) 250V
200A 100A No. 2621-R
400A 100A No. 2641-R
200A No. 242-R
100A No. 2661-R
600A 200A No. 2662-R
400A No. 2664-R*
*Single reducer only (pair not required).
Catalog Symbol: FRN-R †
Current-Limiting
Dual-Element, Time-Delay – 10 seconds (minimum) at 500%
rated current
Ampere Rating: 70 to 600 Amperes
Voltage Rating: 250 Volts AC (or less)
Interrupting Rating: 200,000A RMS Sym.
DC Ratings: 20,000 AIC @ 125 VDC 70-400 Amperes
20,000 AIC @250 VDC 401-600 Amperes
Agency Approvals:
UL Listed, Std. 248-12, Class RK5, Guide JDDZ, File E4273
CSA Certified, C22.2 No. 248.12, Class 1422-01, File 53787
CE logo denotes compliance with European Union Low Voltage Directive
(50-1000 VAC, 75-1500 VDC). Refer to BIF document #8002 or contact
Bussmann Application Engineering at 636-527-1270 for more information.
† To obtain information for 0-60 Amps, access BIF # 1019
Fusetron®FRN-R
Dual-Element, Time-Delay Fuses 70-600A
Class RK5 – 250 Volt
Form No. FRN-R 70-600
Page 2 of 3
BIF Doc #1020
Bussmann®
100
200
400
600
.1
1
10
100
300
1,000
10,000
.01
100
40,000
TIME IN SECONDS
CURRENT IN AMPERES
AMPERE
RATING
Time-Current Characteristic Curves–Average Melt
Fuseblocks for Class R Fuses
(Clip Retaining Spring Standard, Suffix “R”)
Terminal Type (Suffix No.)
Basic Box Lug w/
Catalog — Clip
Amps Poles Number CU only
70 1 R25100-1 CR COR
to 2 R25100-2 CR COR
100 3 R25100-3 CR COR
to 200 1 R25200-1 CR —
to 400 1 R25400-1 CR —
to 600 1 R25600-1 CR —
11-1-00 A00115
Bussmann®
Fusetron®FRN-R
Dual-Element, Time-Delay Fuses 70-600A
Class RK5 – 250 Volt
Current-Limitation Curves
Form No. FRN-R 70-600
Page 3 of 3
BIF Doc #1020
The only controlled copy of this BIF document 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.
11-1-00 A00115
