正因为开关电器有触点，使其转换深度较高，因此在接通电路时，开关电器执行电流的电能损耗较小，对被控电路的影响较小。
Because of the contact point of the switch, the switch has a higher conversion depth, so when the circuit is switched on, the power loss of the switching current is smaller, and the impact on the controlled circuit is smaller.

切断电路时，开关电器有触点，它的执行电路 ide电阻很高，因此可以保证电器的电压等级。
When the circuit is cut off, the switching appliance has contacts, and the ide resistance of its execution circuit is very high, so the voltage level of the appliance can be guaranteed.

与此相反，无触点电器启动后不会产生电弧。但是非接触式电器转换深度较低，所以其损耗较大，并且发热比较严重。
In contrast, contactless appliances do not generate arcing after starting. But the non-contact electrical appliances conversion depth is low, so its loss is large, and heating is more serious.

继电器激磁线圈通电后，激磁线环电流在电磁系统中逐渐增大并产生磁通，其中衔铁与铁心间气隙的磁通对衔铁起作用。
After the relay exciting coil is energized, the exciting loop current increases gradually in the electromagnetic system and produces magnetic flux, in which the flux between armature and air gap between armature and core acts on armature.

当工作磁通逐渐增大时，作用于衔铁的电磁吸力(转矩)也越来越大。如果电磁吸力大于系统反力，衔铁将绕其转动轴旋转，带动执行部分C0的动触头运动(触头系统)，从而实现常开触头和常闭触头变位。
When the working magnetic flux increases gradually, the electromagnetic force (Torque) acting on the armature also increases. If the electromagnetic force is greater than the system reaction force, the armature will rotate around its rotating axis and drive the moving contact (contact system) of the actuating part C0, thus realizing the constant open contact and constant close contact displacement.

当激磁线圈断电后，激磁线圈的电流逐渐减小，电磁系统的磁通也逐渐减小，工作气隙磁通也随之减小，作用在磁铁上的电磁吸力越来越小。如果电磁吸力小于磁铁反力，ABB接触器则衔铁在系统反力的作用下，开始返回初始位置，带动动触点C0向初始位置移动，直至常开触点及常闭触头复位。如果电磁吸力小于磁铁反力，则衔铁在系统反力的作用下，开始返回初始位置，带动动触点C0向初始位置移动，直至常开触点及常闭触头复位。

When the power of the exciting coil is cut off, the current of the exciting coil decreases, the magnetic flux of the electromagnetic system decreases, the air gap magnetic flux also decreases, and the electromagnetic force acting on the magnet decreases. If the electromagnetic force is less than the reaction force of the magnet, the armature of the ABB contactor begins to return to the initial position under the reaction force of the system, driving the contact C0 to move to the initial position until the normally open contact and normally closed contact are reset. If the electromagnetic force is less than the reaction force of the magnet, the armature begins to return to the initial position under the reaction force of the system, and drives the contact C0 to move to the initial position until the normally open contact and normally closed contact are reset.