This part needs a required base in order to operate. Compatible bases: 651-1088498 - PT 10_FSI/C, Fuse modular terminal block, Fuse type: Flat, Type C, nom. Push_in termination, Color: Black 651-1088499 - PT 10_FSI/C_LED 12, Fuse modular terminal block, Fuse type: Flat, Type C, nom. Push_in termination, 12 V LED indication, Color: Black 651-1088500 - PT 10_FSI/C_LED 24, Fuse modular terminal block, Fuse type: Flat, Type C, nom. Push_in termination, 24 V LED indication, Color: Black 651-1088501 - Fuse modular terminal block, Fuse type: Flat, Type C, nom. Push_in termination, 48 V LED indication, Color: Black