Siemens neozed fuse link 400v ac size do1 and do2 siemens 5se2320 the siemens 5se2320 is a neozed fuse link that is primarily used in neozed fuses systems in distribution technology and industrial switchgear assemblies the fuse is size do1 and rated at 400v ac 20a colour coded blue siemens 5se2320 neozed fuse do2 20 a 10 pcs