This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
鉡 combines 金 (metal) with 半, which likely contributes the sound. The exact historical development is uncertain, and the character is rare.
The left side is metal 金, and the right side is half 半. Picture a half-finished metal tool, but its purpose is unclear.
For ハン, imagine a half-metal object that you can barely hold in your hand: hand -> ハン, and the metal piece is only half complete.