"GT" suffix on LittleFuse 438 series surface mount fuses

Comparison
Searched Part: 043803.5WRGT
Compared To: 043803.5WR
what does the “GT” mean

The “GT” suffix on the 438 series of LittleFuse surface mount fuses appears to indicate that the 438GT series now replaces the straight 438 series which has gone obsolete