What does AC contactor 43,44 stand for? 13,14 is normally open,43,44 is normally open,21,22 is normally closed,31,32 is normally closed. Normally open and normally closed numbering is regular, the units digit is 1,2 is generally normally closed, the units digit is 3,4 is generally normally open. Some contactor auxiliary contacts are not normally open and normally closed marks, only numbers, so we must pay attention to.
44 represents 4 normally open points and 4 normally closed points, 43 represents 4 normally open points and 3 normally closed points