NXP BT151U-650C

Semiconductor package is a carrier / shell used to contain and cover one or more semiconductor components or integrated circuits. The material of the shell can be metal, plastic, glass or ceramic.

Current rating is the maximum current that a fuse will carry for an indefinite period without too much deterioration of the fuse element.

the minimum current which must pass through a circuit in order for it to remain in the 'ON' state.