Contactor in the motor control circuit and the power switch different effects

Power switch switch, such as iron shell automatic air switch is generally not suitable for frequent operation and remote control, and general motor control are needed. Ac contactor is suitable for the remote control connected or disconnected frequently exchange main circuit, it has the general power switch can realize the function of remote control, and has a high operating frequency, reliable work and stable performance, etc. But the ac contactor protection function is poor, do not have such as overload, short circuit protection function, and these functions is usually necessary to general power switch, motor control circuit automatic air switch, in particular, its perfect complete protection agency, can effectively protect the motor. So need to be used by both to cooperate to achieve flexible control, protection.