Nylon / ABS + Resin Cast AESW020
Likely the smallest in this series. Primary current maybe around 20 A (or similar low rating).
Nylon / ABS + Resin Cast AESW035
Mid-low range. Perhaps ~35 A (or whatever scale the manufacturer uses). Larger than AESW020, more rugged.
Nylon / ABS + Resin Cast AESW050
Middle of the range. Possibly ~50 A primary. Physical size somewhat larger, increased thermal and mechanical capability.
Nylon / ABS + Resin Cast AESW070
Higher current mid-range. Possibly ~70 A or similar. More robust design, maybe larger aperture window to accept thicker conductor.
Nylon / ABS + Resin Cast AESW100
Highest current among these listed. Likely ~100 A primary or equivalent rating. Largest physical size, more resin to dissipate heat.