Fuse Diagnostic Sizing Charts - bussmann.com

1 fuse Diagnostic Sizing Charts Ballasts fuse & Holder Recommendations Indoor Fluorescent Consult fixture manufacturer for size and type. fuse Holder(s) fuse Holder(s). GLR HLR GLQ HLQ. GMF GMQ. GRF. All Other (Mercury, fuse & Holder Recommendations Consult fixture manufacturer for size and type. fuse Holder(s) fuse Holder(s) fuse Holder(s). Sodium, etc.). BAF HPF KTK-R HPS-RR SC 0-15 HPF-EE. BAN HPS FNQ-R HPF-RR HPS-EE. KTK LP-CC SC 20 HPF-JJ. FNM HPS-JJ. FNQ KTQ HPS-L SC 25-30 HPF-FF. FNW BBS HPF-L HPS-FF. fuse & Holder Recommendations Outdoor Mercury, Sodium, etc. Consult fixture manufacturer for size and type. fuse Holder(s) fuse Holder(s). BAF HEB KTK-R HEY. BAN HEX FNQ-R. KTK HPC-D LP-CC. FNM. FNQ. FNW. capacitors (NEC 460). Protected by 150% to 175% of Full Load Current fuse Recommendations Time-Delay Fuses.

2 Volts fuse (s). 0-250 LPN-RK_SP, FRN-R. 0-600 LPS-RK_SP, FRS-R. 0-600 LPJ_SP, LP-CC, FNQ-R, TCF. Protected by fuse Recommendations 250% to 300% of Full Load Current. Non-Time-Delay Fuses. Volts fuse (s). 0-250 KTN-R, NON. 0-300 JJN. 0-600 KTS-R, NOS. On Load Side of Motor Running 0-600 JKS, KTK-R. Protection recommended as shown, but not required. Overcurrent Device. 0-600 JJS. 202 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 fuse Recommendation Electric Space Heating amps for each subdivided load. Volts fuse (s). 0-250 LPN-RK_SP. FRN-R, NON. 0-300 JJN. 0-480 SC 25 to SC 60. 0-600 LPS-RK_SP. FRS-R, NOS. 0-600 JJS. 0-600 LPJ_SP, LP-CC. Electric Boilers with Resistance Size at 125% or next size larger but in no case larger than 150 FNQ-R, JKS, KTK-R, Type Immersion Heating amps for each subdivided load.

3 TCF, SC 1 2 to SC 20. Elements in an ASME Rated and Stamped Vessel Mains, Feeders, Branches Feeder Circuits No Motor Load 100% of non-continuous load plus 125% of continuous load. fuse Recommendations (600A & Less) Volts fuse (s). 0-250 LPN-RK_SP, FRN-R. 0-300 JJN. 0-600 LPS-RK_SP, FRS-R. 0-600 JJS. 0-600 LPJ_SP, LP-CC. JKS, KTK-R. Combination Motor Loads 150%* of the FLA of largest motor (if there are two or more motors of and Other Loads 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 fuse Recommendations load plus 125% of continuous, non-motor load. Volts fuse (s). 0-25O LPN-RK_SP, FRN-R. 0-600 LPS-RK_SP, FRS-R. Motor Loads 150%* of the FLA of largest motor (if there are two or more motors 0-600 LPJ- SP, LP-CC.)

4 Of same size, one is considered to be the largest) plus the sum of all the FLA for all other motors. *A max. of 175% (or the next standard size if 175% does not corre- spond to a standard size) is allowed for all but wound rotor and all dc motors. Main, Branch & 150% to 225% of full load current of largest motor plus 100% of full fuse Recommendation Feeder Circuits load current of all other motors plus 125% of continuous non-motor Volts fuse (s). (601-6000A) load plus 100% of non-continuous non-motor load. 0-600 KRP-C_SP. 2005 Cooper Bussmann 203. fuse Diagnostic Sizing Charts Motor Loads (NEC 430). fuse Sized For: fuse Recommendations Backup Overload w/ Motor Protected by Time- Volts fuse (s). 600V & Less Starter & Short-Circuit 125% of motor FLA or next size larger.

5 Delay Fuses 0-250 FRN-R. Protection 0-600 FRS-R. fuse Recommendations 130% of motor FLA or next size larger. Volts fuse (s). 0-250 LPN-RK_SP. 0-600 LPS-RK_SP. 175%* of motor FLA or next size larger. (If 175% does not corre- Short-Circuit Only spond to a standard size). If this will not allow motor to start, due to fuse Recommendations higher than normal inrush currents or longer than normal Volts fuse (s). acceleration times (5 sec. or greater), fuse may be sized up to 225% 0-250 LPN-RK_SP, FRN-R. or next size smaller. 0-600 LPS-RK_SP, FRS-R. 0-600 LPJ_SP, TCF. Protected by Non-Time Delay Fuses & all Short-Circuit Only Max. of 300%* of motor FLA or next size larger (if 300% does not fuse Recommendations Class CC Fuses correspond to a standard size). If this will not allow motor to start Volts fuse (s).

6 Due to higher than normal inrush currents or longer than normal 0-250 KTN-R, NON. acceleration times (5 sec. or greater), fuses through 600 amps may 0-300 JJN. be sized up to 400% or next size smaller. 0-600 KTS-R, NOS. 0-600 JJS. 0-600 LP-CC, JKS, KTK-R. *150% for wound rotor and all DC motors. Compare the min. melting time-current characteristics of the fuses with the time-current characteristics of the overload relay curve. The fuse Recommendations Above 600V Volts fuse (s). size fuse which is selected should be such that protection is provided by the fuse and overload protection is provided by the controller overload relays. 2400 JCK, JCK-A, JCH. 4800 JCL, JCL-A, JCG. 7200 JCR, WKMSJ. Solenoids (Coils). fuse Recommendation Branch Circuit Volts fuse (s). Size at 125% or next size smaller.

7 Fuses 0-250 Best: LPN-RK_SP. FRN-R. 0-600 LPS-RK_SP. FRS-R. 0-600 LPJ_SP, LP-CC. FNQ-R, TCF. Supplementary fuse Recommendation Size at 125% or next size larger. Fuses Volts fuse (s). 0-32 MDL 9-30A, FNM 20-30A. 0-125 MDA 25-30A, FNM 12-15A. 0-250 MDL 1 16-8A, MDA 2 10-20A, FNM 1 10-10A, FNW 12-30A, MDQ 1 100-7A. 0-500 FNQ 1 10-30A. 204 2005 Cooper Bussmann fuse Diagnostic Sizing Charts Transformers 600V Nominal or Less (NEC ). Optimum Protection NEC Maximums Note: Components on the secondary still need Max. 300% or next size smaller (See Primary overcurrent protection Rated primary current less 125% or next size larger NEC (C) for control circuit trans- Protection than 2 amps former maximum of 500%. Only Rated primary current greater than or equal to 2 amps but 125% or next size larger Max.)

8 167% or next size smaller less than 9 amps Rated primary current greater 125% or next size larger Max. of 125% or next larger*. than or equal to 9 amps Primary And Without Thermal Rated secondary current less A A. Secondary Overload Protection than 9 amps Protection Rated secondary current 9 B B. % of Primary FLA. amps or greater (or next FLA size smaller). A = 250%. Transformer B = 250%. With Thermal Rated secondary current less C C C = 600%. Impedance of 6%. Overload Protection than 9 amps Primary and secondary D = 600%. or Less fuses at 125% of primary E = 400%. and secondary FLA or F = 400%. Rated secondary current 9 D next size larger D. amps or greater % of Secondary FLA. A = 167% or next size smaller B = 125% or next size larger*. Transformer Rated secondary current less E E C = 167% or next size smaller Impedance of More than 9 amps D = 125% or next size larger*.

9 Than 6% But Less E = 167% or next size smaller Than 10% F = 125% or next size larger*. Rated secondary current 9 F F. amps or greater *When 125% of FLA corresponds to a standard rating, the next larger size is not permitted. fuse Recommendations Volts fuse (s). 250V LPN-RK_SP, FRN-R. 600V KRP-C_SP, LPJ_SP, LPS-RK_SP, FNQ-R, FRS-R, TCF. 2005 Cooper Bussmann 205. fuse Diagnostic Sizing Charts Transformers Over 600V Nominal (NEC ). Note: Components on the secondary still need Primary Primary at code max. of 250% or next overcurrent protection Supervised Protection standard size if 250% does not corre- Installations Only spond to a standard rating Primary Primary and Transformer Secondary at at code Secondary Secondary Impedance Less Than code max. of max. of Over 600V.

10 Protection or Equal to 6% 250%. 300%. Secondary Secondary at 600V or code max. of Below 250% fuse Recommendations Volts fuse (s). 250V LPN-RK_SP, FRN-R. Transformer Primary Secondary at 600V LPS-RK_SP, LPJ-_SP, Impedance Greater at code Secondary code max. of KRP-C_SP, FRS-R, FNQ-R, Than 6% But Less max. of Over 600V. 225% TCF. Than 10% 300%. 2475V JCD. 2750V JCX. 2750/5500V JCW. Secondary Secondary at 5500V JCE, JCQ, JCY, JCU, 600V or code max. of ABWNA, AMWNA, Below 250%. FFN. 7200V ABWNA, SDLSJ, Primary at code max. of 300% Secondary at code max. of SFLSJ. Transformer 8300V JCZ, JDZ, FFN. Unsupervised or next standard size if 300% Secondary 250% or next standard size if Impedance Less Than 15500V JCN, JDN, JDM, CAVH. Installations does not correspond to a Over 600V 250% does not correspond to or Equal to 6% 17500V CAV, SDM.