I am beginning to see the reason why so many of these plugs and sockets lead to melt downs, boat fires or entire marina's burning down. The entire contact area here is but a 1.3mm X 2.7mm and 1.3mm X 2.4mm area often trying to handle 25A - 30A of current.



Smart Plug 30A


Back of Pin Contact = 16.4mm X 8.5mm = 139.4 sq mm
Front of Pin Contact = 6mm X 8.5mm = 51 sq mm
Total Contact Area = 190.4 sq mm


30A Twist Lock


Back of Pin Contact = 1.3mm X 2.7mm = 3.51 sq mm
Front of Pin Contact = 1.3mm X 2.4mm = 3.12 sq mm
Total Contact area with dimple locked in place = 6.63 sq mm


Disclaimer: Due to the curved shape of the twist-lock measurements are as near as can be made, with a caliper, without going to impressions on transfer paper. The Smart Plug pins are flat thus measurements are far easier. Still the difference is HUGE!!!!