Dual-Element, Time-Delay Fuses
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Class RK5 - 250 Volt   1/10-60 Amps FRN-R
  • Provides motor overload, ground fault and short-circuit protection
  • Helps protect motors against burnout from overloads
  • Helps protect motors agaianst burnout from single phasing on three phase systems
  • 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 agaianst low level overcurrent of overloads and will hold an overload which is five times greater than the ampere rating of the fuse for a minimum of ten seconds
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Catalog Symbol: FRN-R
Dual-Element, Time-Delay (10 seconds minimum at 500% rated current)
Ampere Rating: 1/10 to 60 Amperes
Voltage Rating: 250 Volts AC (or less)
Interrupting Rating: 200,000A RMS Sym.
DC Ratings: 20,000 AIC @ 125V DC
Agency Approvals
: U.L. listed-Class RK-5, (Guide JDDZ, File E4273), CSA HRCI-R(Class 1422-01; File 53787)

Catalog Numbers

FRN-R-1/10 FRN-R-1-1/4 FRN-R-4 FRN-R-15
FRN-R-1/8 FRN-R-1-4/10 FRN-R-4-1/2 FRN-R-17-1/2
FRN-R-15/100 FRN-R-1-1/2 FRN-R-5 FRN-R-20
FRN-R-2/10 FRN-R-1-6/10 FRN-R-5-6/10 FRN-R-25
FRN-R-1/4 FRN-R-1-8/10 FRN-R-6 FRN-R-30
FRN-R-3/10 FRN-R-2 FRN-R-6-1/4 FRN-R-35
FRN-R-4/10 FRN-R-2-1/4 FRN-R-7 FRN-R-40
FRN-R-1/2 FRN-R-2-1/2 FRN-R-7-1/2 FRN-R-45
FRN-R-6/10 FRN-R-2-8/10 FRN-R-8 FRN-R-50
FRN-R-8/10 FRN-R-3 FRN-R-9 FRN-R-60
FRN-R-1 FRN-R-3-2/10 FRN-R-10 -
FRN-R-1-1/8 FRN-R-3-1/2 FRN-R-12 -

Carton Quantity and Weight
FRN-R FUSTRON (250 Volts AC)

1-15 10 0.40 0.181
17.5-30 10 0.50 0.227
35-60 10 1.00 0.453

*Weight per carton

Fuse Reducers for Class R Fuses

Fuse Clips
Desired Fuse
(Case) Size
Catalog Number
(Pairs) 250V
60A 30A No. 263-R
100A 30A No. 213-R
100A 60A No. 216-R
200A 60A No. 226-R

Fuseblocks for Class R Fuses
(Clip Retaining Spring Standard, Suffix "R")

Amps Poles Basic Catalog # Screw* Screw *
w/Pres. Plate
Box Lug *
Box Lug*
w/Clip CU only
1/4" Quick-
1/10-30 1 R25030-1 SR PR CR COR QR
1/10-30 2 R25030-2 SR PR CR COR QR
1/10-30 3 R25030-3 SR PR CR COR QR
31-60 1 R25060-1 SR - CR COR -
31-60 2 R25060-2 SR - CR COR -
31-60 3 R25060-3 SR - CR COR -

* Terminal type (suffix number)

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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.

FRN_R60 (orig.-8/1/02)