To ensure reliable switching, these nibs bite through oxide, which can form on silver contacts, eliminating the need for expensive logic level blocks for most applications
Drainage holes prevent buildup of liquid inside the operator which can prevent operation in freezing environments
Grounding nibs bit through paint and other coatings to provide secure ground
Earth terminal provides additional grounding point and allows for daisy chain grounding
Reliability nibs improve contact reliability even under dry circuit and fine dust conditions