We prefer to live by the motto "better safe than sorry" when it comes to wiring your system. This fused distribution block is cheap insurnace against rendering your system useless because one compressor fails. Rather than let one comrpessor take down your entire system, this fuses each compressor individually. Thus, if one of your compressors fails (we hope it never happens), it will pop one fuse and let the other compressor continue to function. Pretty slick if you ask us!