Fuse Diagnostic Sizing Charts 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 SC 20 SC 25-30 Holder(s) HPF-EE HPS-EE HPF-JJ HPS-JJ 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. On Load Side of Motor Running Overcurrent Device. 202 Fuse Recommendations Volts 0-250 0-600 0-600 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 Fuse(s) KTN-R, NON JJN KTS-R, NOS JKS, KTK-R JJS ©2005 Cooper Bussmann Fuse Diagnostic Sizing Charts 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 all the FLA for all other motors plus 100% of non-continuous, non-motor load plus 125% of continuous, non-motor 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 all the FLA for all other motors. Fuse(s) LPN-RK_SP, FRN-R JJN LPS-RK_SP, FRS-R JJS LPJ_SP, LP-CC JKS, KTK-R 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) ©2005 Cooper Bussmann 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. Fuse Recommendation Volts 0-600 Fuse(s) KRP-C_SP 203 Fuse Diagnostic Sizing Charts Motor Loads (NEC® 430) Fuse Sized For: 600V & Less Protected by TimeDelay Fuses Backup Overload w/ Motor Starter & Short-Circuit 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 Non-Time 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 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), fuses through 600 amps may be sized up to 400% or next size smaller. *150% for wound rotor and all DC motors. Above 600V 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. Volts 0-250 0-600 Fuse(s) LPN-RK_SP LPS-RK_SP Fuse Recommendations Volts 0-250 0-600 0-600 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 Fuse(s) KTN-R, NON JJN KTS-R, NOS JJS LP-CC, JKS, KTK-R 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 0-500 204 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 ©2005 Cooper Bussmann Fuse Diagnostic Sizing Charts 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 Transformer Impedance of 6% or Less Transformer Impedance of More Than 6% But Less Than 10% 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 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 ©2005 Cooper Bussmann Fuse(s) LPN-RK_SP, FRN-R KRP-C_SP, LPJ_SP, LPS-RK_SP, FNQ-R, FRS-R, TCF 205 Fuse Diagnostic Sizing Charts 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% Primary at code max. of 300% Primary at code max. of 300% 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 2475V 2750V 2750/5500V 5500V 7200V 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% 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 8300V 15500V 17500V 24000V 36000V 38000V Fuse(s) LPN-RK_SP, FRN-R LPS-RK_SP, LPJ-_SP, KRP-C_SP, FRS-R, FNQ-R, TCF JCD JCX JCW JCE, JCQ, JCY, JCU, 5.5 ABWNA, 5.5 AMWNA, 5.5 FFN 7.2 ABWNA, 7.2 SDLSJ, 7.2 SFLSJ JCZ, JDZ, 8.25 FFN JCN, JDN, JDM, 15.5 CAVH 17.5 CAV, 17.5 SDM 24 SDM, 24 SFM, 24 FFM 36 CAV, 36 SDQ, 36 SFQ 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 206 Fuse(s) FWA FWX FWH FWC, KAC, KBC FWP, 170M Series, SPP FWJ, 170M Series, SPJ ©2005 Cooper Bussmann