Table of contents
RED indicates NEW information
Selecting Circuit Protection . . . . . . . . . . . . . . . . . . . . . 2
High Speed Fuses . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
2005 NEC® guide to fuse selection for various applications . . . . . . . . . . 2-6
General Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88-89
North American fuses & accessories . . . . . . . . . . . . . . . . . . . . . . . . 90-106
Square body fuses & accessories . . . . . . . . . . . . . . . . . . . . . . . . . 107-180
British BS 88 fuses & accessories . . . . . . . . . . . . . . . . . . . . . . . . . 181-190
Ferrule fuses & accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 191-212
Low Voltage, Branch Circuit Rated Fuses . . . . . . . . . . . . 7
Holders & blocks for branch circuit rated fuses . . . . . . . . . . . . . . . . . . 8-10
Dimensions data for branch circuit rated fuses . . . . . . . . . . . . . . . . . 11-12
CUBEFuse™ Class J fuse & holder system . . . . . . . . . . . . . . . . . . . . 13-14
Low-Peak LPJ_SP Class J fuses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Low-Peak LPN-RK_SP & LPS-RK_SP Class RK1 fuses . . . . . . . . . . . 16-18
Low-Peak LP-CC Class CC fuses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Low-Peak KRP-C_SP & KRP-CL Class L fuses . . . . . . . . . . . . . . . . . . 20-21
Fusetron FRN-R (250V) & FRS-R (600V) Class RK5 fuses . . . . . . . . . 22-23
Limitron JKS Class J fuses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Limitron KTN-R (250V) & KTS-R (600V) Class RK1 fuses . . . . . . . . . 26-27
Limitron KTK-R Class CC fuses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
Limitron KTU & KLU Class L Fuses . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
Dura-Lag DLN-R (250V) & DLS-R (600V) Class RK5 fuses . . . . . . . . . . .30
CC-Tron FNQ-R Class CC fuses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
T-Tron JNN (300V) & JJS (600V) Class T fuses . . . . . . . . . . . . . . . . . 32-33
SC Class G fuses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
NON (250V) & NOS (600V) general purpose Class K5 & H fuses . . . . . . .35
Plug fuses (S, T, W, SL and TL), Fusestat fuse adapters . . . . . . . . . . . 36-37
IEC & British Standard Fuses . . . . . . . . . . . . . . . . . . . 213
Application Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 213-214
CSA Type P & Type D fuses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 215
Tron HRC Form II Class C fuses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 216
HRCI industrial ceramic body fuses . . . . . . . . . . . . . . . . . . . . . . . . . . . 217
HRCI-J fast-acting fuses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 218
HRCI-miscellaneous Type K fuses . . . . . . . . . . . . . . . . . . . . . . . . . . . . 219
HRC Form II current-limiting fuses . . . . . . . . . . . . . . . . . . . . . . . . . . . . 220
BS 88 British Standard low voltage fuses . . . . . . . . . . . . . . . . . . . 221-222
DIN Type D & Neozed low voltage fuses . . . . . . . . . . . . . . . . . . . . . . . 223
NH HRC fuses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 224-225
NH low voltage fuses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 226
Class gG/gL & aM IEC industrial ferrule fuses . . . . . . . . . . . . . . . . 227-228
Class aM & gG/gL IEC industrial ferrule fuses with striker . . . . . . . . . . 229
HRC fuse holders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 230
Low Voltage Supplementary Fuses . . . . . . . . . . . . . . . . 39
Fuse Holders and Blocks . . . . . . . . . . . . . . . . . . . . . 231
Holders & blocks for supplementary fuses . . . . . . . . . . . . . . . . . . . . 40-41
Cable (K Series) & Welder (64000/68000 Series) Limiters . . . . . . . . . . . .42
13
⁄32" x 1 1⁄2" (BAF, BAN, KTK & KLM, DCM, FNM & FNQ) fuses . . . . . . . 43-45
13
⁄32" x 1 3⁄8" (BBS & KTQ) fuses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46
GBA/GLD, MIC & MIN. FNA, MIS & KAZ pin indication fuses . . . . . . . 47-48
ANN & ANL Limiters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48
ATC, ATM & MAX automotive blade-type fuses & holders . . . . . . . . . 49-50
GLQ & GMQ In-line size rejecting fuses & holders . . . . . . . . . . . . . . . . . .51
GLR & GMF/GRF In-line non- rejecting fuses & holders . . . . . . . . . . . . . .52
Optima fuse holder modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 232-233
Optima 3-pole overcurrent protection modules . . . . . . . . . . . . . . . 234-235
Class J modular fuse holders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 236
Safety J™ Class J (finger-safe) fuse holders . . . . . . . . . . . . . . . . . 237-238
Global modular fuse holders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 239-240
SAMI™ fuse covers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 241
Class H(K) & R 250V & 600V fuse blocks . . . . . . . . . . . . . . . . . . . 242-247
Class J fuse blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 248-250
Class T 300V & 600V fuse blocks . . . . . . . . . . . . . . . . . . . . . . . . . 251-254
Add-a-pole Class CC & 13⁄32" x 1 1⁄2" fuse blocks . . . . . . . . . . . . . . . . . . . . 255
Class CC, Type M & Class G fuse blocks . . . . . . . . . . . . . . . . . . . . . . . . 256
Modular fuse blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 257
Box cover units for plug fuses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 258
In-line fuse holders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 259-260
Tron in-line fuse holders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 261-262
Panel mounted fuse holders (including indicating) . . . . . . . . . . . . . 263-269
Fuse blocks for 1⁄4" x 1 1⁄4" & 1⁄4" x 1" and fuses . . . . . . . . . . . . . . . . . 270-271
Fuse blocks for 13⁄32" x 1 1⁄2" fuses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .272
Rail mount fuse holders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .273
Electronic - PCB & Small Dimension fuses . . . . . . . . . . .53
5 x 15mm ferrule fuses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
5 x 20mm European (IEC) ferrule fuses . . . . . . . . . . . . . . . . . . . . . . . . . 55
5 x 20mm North American (UL) ferrule fuses . . . . . . . . . . . . . . . . . . . . . 56
1
⁄4" Diameter x 5⁄8" to 1" length ferrule fuses . . . . . . . . . . . . . . . . . . . . . . 57
1
⁄4" Diameter x 1 1⁄4" length fast-acting ferrule fuses . . . . . . . . . . . . . . . . . . 58
1
⁄4" Diameter x 1 1⁄4" length time-delay ferrule fuses . . . . . . . . . . . . . . . . . . 59
PC board mount fuse holders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60-61
PC board fuseclips for 5mm diameter fuses . . . . . . . . . . . . . . . . . . . 62-65
Medium Voltage Fuses . . . . . . . . . . . . . . . . . . . . . . . .67
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
BBU boric acid fuses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69-70
E-rated fuses: CL-14 & bolt-in . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71-72
E-rated fuses for transformers & feeders . . . . . . . . . . . . . . . . . . . . . . 73-76
R-Rated fuses for motor circuit protection . . . . . . . . . . . . . . . . . . . . . 77-79
British Standard IEC fuses for motor circuit protection . . . . . . . . . . . . . . 80
DIN IEC fuses for transformers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .81
Potential transformer fuses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .82
Fast-acting fuses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
British Standard IEC fuses for oil filled switchgear . . . . . . . . . . . . . . . . . 84
EEI-NEMA Type K & T, and Type H & N fuses . . . . . . . . . . . . . . . . . . . . . 85
Fuse clips for medium voltage fuses . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
Power Distribution Blocks . . . . . . . . . . . . . . . . . . .
275
163 Series . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 276-277
Series 11675 & 11725 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 278
Series 160, 162, 163 & 165 distribution blocks . . . . . . . . . . . . . . . . . . 278
Series 162, 163 & 165 power stud blocks . . . . . . . . . . . . . . . . . . . . . . 279
Series 160, 162, 163 & 165 power splicer blocks . . . . . . . . . . . . . . . . 279
Series 14002 & 14004 terminal blocks . . . . . . . . . . . . . . . . . . . . . . . . 280
Wire Connection Products . . . . . . . . . . . . . . . . . . . . . 281
Rail mount terminal & disconnect terminal blocks . . . . . . . . . . . . . 282-286
Sectional terminal blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 287-288
Quick connect terminal blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 289
Series TB (100, 200 & 300) double row terminal blocks . . . . . . . . 290-295
Marking options & covers for double row terminal blocks . . . . . . . 296-297
Series TB 400 & KU double row terminal blocks . . . . . . . . . . . . . . 298-299
Series TS standard, flat & raised base terminal blocks . . . . . . . . . 300-302
Cooper Bussmann circuit protection solutions comply with major industrial standards and agency requirements such as: BS, IEC, DIN, UL, NEMA, CSA, CE, C-UL, etc. and are manufactured at facilities that are ISO 9000 certified.
This catalog is intended to present product data and provide technical information that will help the end user with design application. Cooper Bussmann reserves the right, without notice, to change design or construction or 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 catalog. Once a product has been selected, it should be tested by the user in all possible applications. Further, Cooper Bussmann takes no responsibility for errors or omissions contained in this catalog, or for mis-application of any Cooper Bussmann product. Extensive
product information is available in the Bussmann product data sheets available on line at www.cooperbussmann.com/products/datasheet.asp.
©2005 Cooper Bussmann
For product data sheets, visit www.cooper.bussmann.com/products/datasheet.asp
Table of contents
RED indicates NEW information
Low Voltage, Branch Circuit Rated Fuses . . . . . 7
Low Voltage Supplementary Fuses . . . . . . . . . . 39
Electronic - PC Board and
Small Dimension
Fuses
. .Small
. . . . . . . . . . . . . . . 53
Electronic
- PC Board
and
Medium Voltage Fuses and Fuse Links . . . . . . . 67
High Speed Fuses . . . . . . . . . . . . . . . . . . . . . 87
IEC &
British
Fuses
IEC & British Standard Fuses . . . . . . . . . . . . . 213
Fuse
Holders
& Blocks
Fuse Holders and Blocks . . . . . . . . . . . . . . . . 231
Power
Distribution
Blocks
Telpower TPC & TPCDS compact fused disconnect switches . . . . . . . . 332
Telpower TPM & TPMDS miniature fused disconnect switches . . . . . . . 333
Fused disconnect switches for TPA fuses . . . . . . . . . . . . . . . . . . . 334-335
Fused disconnect switches for TPS fuses . . . . . . . . . . . . . . . . . . . . . . 336
Fused disconnect switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 337-338
Telpower high-current switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 339
Telpower 70-600A: 170Vdc fuses . . . . . . . . . . . . . . . . . . . . . . . . . . . . 340
Telpower 1-600A: 170Vdc fuses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 341
Indicating fuses & holders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 342-343
Telpower specialty fuses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 344-345
F38, FE2475 & F7036 Series filtered terminal blocks . . . . . . . . . . . 346-348
Series C7021 & C7024 power feed thru terminal blocks . . . . . . . . 349-350
Page
High Speed
Fuses
Telecom Protection Devices . . . . . . . . . . . . . . . . . . 331
Catalog Sections
Medium
Voltage
Fuses
Safety Module™ fused disconnect switch . . . . . . . . . . . . . . . . . . . . . . . 304
Coordination Module™ fused panelboard . . . . . . . . . . . . . . . . . . . . . . . 305
Power Module™ elevator disconnects . . . . . . . . . . . . . . . . . . . . . . . . . 306
Overview for fusible disconnects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 307
30A Base & rail mount fusible disconnects . . . . . . . . . . . . . . . . . . 308-309
60-100A Base & rail mount fusible disconnects . . . . . . . . . . . . . . 310-311
200-800A Base & rail mount fusible disconnects . . . . . . . . . . . . . 312-313
30-800A 2-, 3-, 4- & 6-Pole enclosed fusible disconnects . . . . . . . 314-317
Overview for non-fusible disconnects . . . . . . . . . . . . . . . . . . . . . . 318-319
16-100A Base & rail mount non-fusible disconnects . . . . . . . . . . . 320-321
16-100A door mounted non-fusible disconnects . . . . . . . . . . . . . . . . . . 322
400-800A Non-fusible disconnects & accessories . . . . . . . . . . . . . 323-324
16-80A 3-Pole enclosed non-fusible disconnects . . . . . . . . . . . . . . . . . 325
16-3150A 3-Pole enclosed non-fusible disconnects . . . . . . . . . . . . . . . 326
16-400A 2-, 4- & 6-Pole enclosed non-fusible disconnects . . . . . . 327-328
A/C disconnects - fused and non-fused . . . . . . . . . . . . . . . . . . . . . . . . 329
Fused, dead front disconnect switches . . . . . . . . . . . . . . . . . . . . . . . . . 330
Low Voltage Low Voltage
Electronic
Branch
Supplementary
Fuses
Circuit
Fuses
Disconnects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 303
Power Distribution Blocks . . . . . . . . . . . . . . . 275
TVS transient voltage surge suppressors . . . . . . . . . . . . . . . . . . . . . . . 352
TVSS transient surge suppression limiters . . . . . . . . . . . . . . . . . . . . . 353
Wire
Connection
Products
Surge Suppression Devices . . . . . . . . . . . . . . . . . . . . 351
Wire Connection Products . . . . . . . . . . . . . . . 281
Disconnects . . . . . . . . . . . . . . . . . . . . . . . . 303
Application Guide . . . . . . . . . . . . . . . . . . . . . . . . . . 361
Telecom Protection Devices . . . . . . . . . . . . . 331
Surge
Application
Suppression Accessories
Guide
Devices
Cooper Bussmann Electrical Safety Services . . . . . . . . . . . . . . . . . . . . . 262
Fuse technology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 363-369
Motor circuit branch circuit protection . . . . . . . . . . . . . . . . . . . . . . . . . 370
Conductor & termination considerations . . . . . . . . . . . . . . . . . . . . 371-373
Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 374-376
Out-of-stock substitution/upgrades . . . . . . . . . . . . . . . . . . . . . . . . . . . . 376
Cooper Bussmann electrical trademarks . . . . . . . . . . . . . . . . . . . . . . . . 376
Industrial & commercial fuse applications . . . . . . . . . . . . . . . . . . .377-378
Telcom
Protection
Devices
Fuse service kits & assortments . . . . . . . . . . . . . . . . . . . . . . . . . . 255-257
Clip clamps & rail adapters (DIN & American) . . . . . . . . . . . . . . . . . . 258
Spare fuse holders, pullers, testers & cabinets . . . . . . . . . . . . . . . . . . 259
Fuse reducers & dummy "neutrals" . . . . . . . . . . . . . . . . . . . . . . . . . . . 260
Disconnects
Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 255
Surge Suppression Devices . . . . . . . . . . . . . . 351
Accessories . . . . . . . . . . . . . . . . . . . . . . . . 255
Catalog Number Index . . . . . . . . . . . . . . . . . . . . 379-383
Sales support & manufacturing facilities . . . . . . . . . . . 384
Application Guide . . . . . . . . . . . . . . . . . . . . . 361
®
Cross reference and Low-Peak Fuse Stock Consolidation
Index
Inside back cover
Index by Part Number . . . . . . . . . . . . . . . . . . 379
For product Data Sheets, visit www.cooperbussmann.com/products/datasheet.asp
1
Low Voltage, Branch Circuit Rated Fuses
Selecting circuit protection
The following fuse selection guides are based on the 2005
NEC® and provided fuse recommendations for the various
applications listed.
These are only suggestions. Final fuse selection should be
performed only by a qualified personnel able to fully asses
an application’s circuit protection requirements. If you need
assistance in selecting a fuse for a particular application, call
the Cooper Bussmann Application Engineering team. This
team is staffed by degreed electrical engineers and available
by phone for technical and application support Monday –
Friday, 8:00 a.m. – 5:00 p.m. Central Time.
Application Engineering can be reached via phone, fax or
e-mail:
• Phone: 636-527-1270
• Fax: 636-527-1607
• E-mail: fusetech@cooperbussmann.com
Ballasts
Indoor
Fluorescent
Consult fixture manufacturer for size and type.
All Other (Mercury,
Sodium, etc.)
Consult fixture manufacturer for size and type.
Fuse & Holder Recommendations
Fuse
GLR
GMF
GRF
Holder(s)
HLR
Fuse
GLQ
GMQ
Holder(s)
HLQ
Fuse & Holder Recommendations
Fuse
BAF
BAN
KTK
FNM
FNQ
FNW
Holder(s)
HPF
HPS
Fuse
KTK-R
FNQ-R
LP-CC
Holder(s)
HPS-RR
HPF-RR
KTQ
BBS
HPS-L
HPF-L
Fuse
SC 0-15
Holder(s)
HPF-EE
HPS-EE
SC 20
HPF-JJ
HPS-JJ
SC 25-30 HPF-FF
HPS-FF
Fuse & Holder Recommendations
Outdoor
Mercury, Sodium, etc.
Consult fixture manufacturer for size and type.
Fuse
BAF
BAN
KTK
FNM
FNQ
FNW
Holder(s)
HEB
HEX
HPC-D
Fuse
KTK-R
FNQ-R
LP-CC
Holder(s)
HEY
Capacitors (NEC® 460)
Protected by
Time-Delay Fuses.
150% to 175% of Full Load Current
Protected by
Non-Time-Delay Fuses.
250% to 300% of Full Load Current.
Volts
0-250
0-600
0-600
On Load Side of Motor Running
Overcurrent Device.
2
Fuse Recommendations
Protection recommended as shown, but not required.
Fuse(s)
LPN-RK_SP, FRN-R
LPS-RK_SP, FRS-R
LPJ_SP, LP-CC,
FNQ-R, TCF
Fuse Recommendations
Volts
0-250
0-300
0-600
0-600
0-600
For product Data Sheets, visit www.cooperbussmann.com/products/datasheet.asp
Fuse(s)
KTN-R, NON
JJN
KTS-R, NOS
JKS, KTK-R
JJS
Low Voltage, Branch Circuit Rated Fuses
Selecting circuit protection
Electric Heat (NEC® 424)
Size at 125% or next size larger but in no case larger than
60 amps for each subdivided load.
Electric Space Heating
Fuse Recommendation
Volts
0-250
0-300
0-480
0-600
0-600
0-600
Electric Boilers with
Resistance Type Immersion
Heating Elements in an ASME
Rated and Stamped Vessel
Size at 125% or next size larger but in no case larger than
150 amps for each subdivided load.
Fuse(s)
LPN-RK_SP
FRN-R, NON
JJN
SC 25 to SC 60
LPS-RK_SP
FRS-R, NOS
JJS
LPJ_SP, LP-CC
FNQ-R, JKS, KTK-R,
TCF, SC 1⁄2 to SC 20
Mains, Feeders, Branches
Feeder Circuits
(600A & Less)
No Motor Load
100% of non-continuous load plus 125% of continuous load.
Fuse Recommendations
Volts
0-250
0-300
0-600
0-600
0-600
Combination Motor
Loads and Other Loads
Motor Loads
150%* of the FLA of largest motor (if there are two or more
motors of same size, one is considered to be the largest) plus
the sum of ail the FLA for all other motors plus 100% of noncontinuous, non-motor load plus 125% of continuous, nonmotor load.
150%* of the FLA of largest motor (if there are two or more
motors of same size, one is considered to be the largest) plus
the sum of ail the FLA for ail other motors.
Fuse(s)
LPN-RK_SP, FRN-R
JJN
LPS-RK_SP, FRS-R
JJS
LPJ_SP, LP-CC
JKS, KTK-R, LPT
Fuse Recommendations
Volts
0-25O
0-600
0-600
Fuse(s)
LPN-RK_SP, FRN-R
LPS-RK_SP, FRS-R
LPJ- SP, LP-CC
*A max. of 175% (or the next standard size if 175% does not
correspond to a standard size) is allowed for all but wound
rotor and all dc motors.
Main, Branch &
Feeder Circuits
(601-6000A)
150% to 225% of full load current of largest motor plus 100%
of full load current of all other motors plus 125% of continuous
non-motor load plus 100% of non-continuous non-motor load.
For product Data Sheets, visit www.bussmann.com/products/datasheet.asp
Fuse Recommendation
Volts
0-600
Fuse(s)
KRP-C_SP
3
Low Voltage, Branch Circuit Rated Fuses
Selecting circuit protection
Motor Loads (NEC® 430)
Fuse Sized For:
600V & Less
Protected by TimeDelay Fuses
Backup Overload w/
Motor Starter & ShortCircuit Protection
Fuse Recommendations
125% of motor FLA or next size larger.
Volts
0-250
0-600
Fuse(s)
FRN-R
FRS-R
Fuse Recommendations
130% of motor FLA or next size larger.
Short-Circuit Only
Protected by NonTime Delay Fuses &
all Class CC Fuses
Short-Circuit Only
175%* of motor FLA or next size larger. (If 175% does not correspond to a standard size). If this will not allow motor to start,
due to higher than normal inrush currents or longer than normal acceleration times (5 sec. or greater), fuse may be sized up
to 225% or next size smaller.
Max. of 300%* of motor FLA or next size larger (if 300% does
not ocrrespond to a standard size). If this will not allow motor
to start due to higher than normal inrush currents or longer
than normal acceleration times (5 sec. or greater), fuses
through 600 amps may be sized up to 400% or next size
smaller.
Volts
0-250
0-600
Fuse Recommendations
Volts
0-250
0-600
0-600
Compare the min. melting time-current characteristics of the fuses with the time-current characteristics of the overload relay
curve. The size fuse which is selected should be such that short.circuit protection is provided by the fuse and overload protection is provided by the controller overload relays.
Fuse(s)
LPN-RK_SP, FRN-R
LPS-RK_SP, FRS-R
LPJ_SP, TCF
Fuse Recommendations
Volts
0-250
0-300
0-600
0-600
0-600
*150% for wound rotor and all DC motors.
Above 600V
Fuse(s)
LPN-RK_SP
LPS-RK_SP
Fuse(s)
KTN-R, NON
JJN
KTS-R, NOS
JJS
LP-CC, JKS, KTK-R,
LPT
Fuse Recommendations
Volts
2400
4800
7200
Fuse(s)
JCK, JCK-A, JCH
JCL, JCL-A, JCG
JCR, 7.2 WKMSJ
Solenoids (Coils)
Branch Circuit
Fuses
Fuse Recommendation
Size at 125% or next size smaller.
Volts
0-250
0-600
0-600
Supplementary
Fuses
Size at 125% or next size larger.
Fuse Recommendation
Volts
0-32
0-125
0-250
0-500
4
For product Data Sheets, visit www.cooperbussmann.com/products/datasheet.asp
Fuse(s)
Best: LPN-RK_SP
FRN-R
LPS-RK_SP
FRS-R
LPJ_SP, LP-CC
FNQ-R, TCF
Fuse(s)
MDL 9-30A,
FNM 20-30A
MDA 25-30A,
FNM 12-15A
MDL 1⁄16-8A,
MDA 2⁄10-20A,
FNM 1⁄10-10A,
FNW 12-30A,
MDQ 1⁄100-7A
FNQ 1⁄10-30A
Low Voltage, Branch Circuit Rated Fuses
Selecting circuit protection
Transformers 600V Nominal or Less (NEC® 450.3)
Primary
Protection
Only
Primary And
Secondary
Protection
Note: Components on the secondary still
need overcurrent protection
Without Thermal
Overload
Protection
With Thermal
Overload
Protection
NEC® Maximums
Optimum Protection
Rated primary current less
than 2 amps
125% or next size larger
Max. 300% or next size smaller (See
NEC® 430.72(C) for control circuit
transformer maximum of 500%
Rated primary current
greater than or equal to 2
amps but less than 9 amps
125% or next size larger
Max. 167% or next size smaller
Rated primary current
greater than or equal to 9
amps
125% or next size larger
Max. of 125% or next larger*
Rated secondary current
less than 9 amps
A
A
Maximum Fuse Size
Transformer
Impedance of 6%
or Less
Transformer
Impedance of
More Than 6%
But Less Than
10%
Rated secondary current 9
amps or greater
B
B
Rated secondary current
less than 9 amps
C
Rated secondary current 9
amps or greater
D
Rated secondary current
less than 9 amps
E
E
Rated secondary current 9
amps or greater
F
F
C
Primary and secondary
fuses at 125% of primary and secondary FLA or
next size larger
D
% of Primary FLA
(or next FLA size smaller)
A = 250%
B = 250%
C = 600%
D = 600%
E = 400%
F = 400%
% of Secondary FLA
A = 167% or next size smaller
B = 125% or next size larger*
C = 167% or next size smaller
D = 125% or next size larger*
E = 167% or next size smaller
F = 125% or next size larger*
*When 125% of FLA corresponds to
a standard rating, the next larger size
is not permitted.
Fuse Recommendations
Volts
250V
600V
Fuse(s)
LPN-RK_SP, FRN-R
KRP-C_SP, LPJ_SP, LPS-RK_SP, FNQ-R, FRS-R, TCF
For product Data Sheets, visit www.bussmann.com/products/datasheet.asp
5
Low Voltage, Branch Circuit Rated Fuses
Selecting circuit protection
Transformers Over 600V Nominal (NEC® 450.3)
Supervised
Installations
Primary
Protection
Only
Primary at code max. of 250% or
next standard size if 250% does not
correspond to a standard rating
Primary
and
Secondary
Protection
Transformer
Impedance Less
Than or Equal to 6%
Transformer
Impedance Greater
Than 6% But Less
Than 10%
Unsupervised
Installations
Transformer
Impedance Less
Than or Equal to 6%
Transformer
Impedance Greater
Than 6% But Less
Than 10%
Primary
at code
max. of
300%
Primary
at code
max. of
300%
Primary at code max. of
300% or next standard size
if 300% does not correspond to a standard rating
Primary at code max. of
300% or next standard size
if 300% does not correspond to a standard rating
Note: Components on the secondary still need
overcurrent protection
Secondary
Over 600V
Secondary at
code max. of
250%
Secondary
600V or
Below
Secondary at
code max. of
250%
Secondary
Over 600V
Secondary at
code max. of
225%
Secondary
600V or
Below
Secondary at
code max. of
250%
Secondary
Over 600V
Secondary at code max. of
250% or next standard size
if 250% does not correspond to a standard rating
Secondary
600V or
Below
Secondary at code max. of
125% or next standard size
if 125% does not correspond to a standard rating
Secondary
Over 600V
Secondary at code max. of
225% or next standard size
if 225% does not correspond to a standard rating
Secondary
600V or
Below
Secondary at code max. of
125% or next standard size
if 125% does not correspond to a standard rating
Fuse Recommendations
Volts
250V
600V
Fuse(s)
LPN-RK_SP, FRN-R
LPS-RK_SP, LPJ-_SP,
KRP-C_SP, FRS-R, FNQ-R,
TCF
2475V
JCD
2750V
JCX
2750/5500V JCW
5500V
JCE, JCQ, JCY, JCU,
5.5 ABWNA, 5.5 AMWNA,
5.5 FFN
7200V
7.2 ABWNA, 7.2 SDLSJ,
7.2 SFLSJ
8300V
JCZ, JDZ, 8.25 FFN
15500V
JCN, JDN, JDM, 15.5 CAVH
17500V
17.5 CAV, 17.5 SDM
24000V
24 SDM, 24 SFM, 24 FFM
36000V
36 CAV, 36 SDQ, 36 SFQ
38000V
38 CAV
Solid State Devices (Diodes, SCRs, Triacs, Transistors)
Short-Circuit
Protection
Only
Fuse Recommendations
“F,” “S,” “K,” & 170M Series fuses sized up to several sizes
larger than full load RMS or dc rating of device.
Volts
0-130
0-250
0-500
0-600
0-700
0-1000
6
For product Data Sheets, visit www.cooperbussmann.com/products/datasheet.asp
Fuse(s)
FWA
FWX
FWH
FWC, KAC, KBC
FWP, 170M Series,
SPP
FWJ, 170M Series,
SPJ