The tin-plated solder tails keep the board-side cost down. The locking ramp holds the mate under vibration — a half-turn loose is a dropout, but the ramp prevents that in industrial panels and appliances.
Board lock and glow wire — safety and assembly hold
Glow wire compliance (per IEC 60335-1) means this connector can be used in household appliances where a hot component must not sustain a flame.
