The structure and working principle of electromagnetic ac contactor

 The principle,selection and connection of ac contactor,ac contactor is widely used as the power of open circuit and control circuit.It use main contact to mini electric motor open and close circuit,to perform the control instruction with auxiliary contacts.Main contact usually only normally generator stator open contacts and auxiliary contacts often two to have often opened the function of normally closed contacts,small contactor is also often used as intermediate relay with main circuit.Ac contactor contact,made of silver tungsten alloy has good electrical conductivity and high temperature electric motors price erosion resistance.

Ac contactor has four main components:(1) the electromagnetic system,including attracting coil,moving iron core and static iron core;(2) the contact system,including three main contactor and two normally open,normally closed,auxiliary contacts,it is even with the moving iron core of linked together with each other;(3) wholesalemotor.blogspot.com arc extinguishing device,generally larger capacity of ac contactor has arc extinguishing device,in order to quickly cut off the electric arc,from burn out the main contactor;(4) insulation shell and accessories,all kinds of springs,transmission mechanism,short circuit ring,terminal,etc.