3 grams; The silver content of the contacts with high current is: 85%, 40%, 30% respectively. The one with low current is all alloy. Ac contactors usually have two sets of auxiliary contacts, a pair of normally open, a pair of normally closed, used to form logic circuits, such as self-holding circuit, XOR gate (interlock) circuit, priority circuit, and so on. The secondary contact capacity is usually small and is used for control.