Eaton PV240 User Manual

Eaton Corporation Page 37 Ver 1.1The standard formula for DC Fuse Selection:Nominal Voltage of fuse must be 600VDC Rating and the fuse should beselected between 1.56 x Isc < INAssume the maximum short circuit current (Isc) of the solar module used is4.85A. The rating of the selected fuse must have a nominal current greaterthan 1.25 times but less than 1.6 times the short circuit current as 1.56 x Isc< INCalculated by Standard Formula:A) 4.85A x 1.56 = 7.56AB) Implemented the above result within 1.56 x Isc < INC) The calculation result will be 7.56A < IN. That means installer must toselect a fuse rating that is greater than 7.56 A, but must lesser than 9.70A. Refer to the products information provided from Littlefuse factory, weare able to select KLKD008, 8A, 600VDC DC as the protection fuse forthe DC input side.IMPORTANTThe fuse calculation for the fuse selection is referring to therequirements (information) that had been indicated within theNational Electrical Code(NEC), ANSI/NFPA 70.To ensure trouble-free fuse protection, Eaton recommends usingfuses that have been tested by Eaton. The specifications forfuses from Littelfuse and KLKD series can be downloaded fromwww.littlefuse.com.It is important to follow the standard formula in order to select theproper rating of fuse for DC protection. And the size of the DCand AC wiring must to meet with the required size of cables asdescription at chapter H) DC input terminal block and chapter J)AC output terminal block in the section 6.2.