JJS-45 T-Tron® BUSSMANN FUSE 45Amp - USED, bought as new but because storage wear I'm selling as used.
Price is for 1 each.

Current-Limiting
Class T
Very Fast-Acting
Voltage Rating: 600Vac (or less)
Interrupting Rating: 200,000A RMS Sym.

Commonly applied in electric heat circuits, load center, disconnect switches, and meters.
The small size of the T-Tron fuses permits installation in panelboards and control centers for system upgrading when existing circuit breakers cannot safely interrupt larger available short-circuit currents.
High speed of response for semiconductor protection.

Small, space-saving fuses provide a high degree of current limitation on short-circuits for excellent component protection.