Both are Schneiders. The difference is that the front one is a new trademark, and the back one is a trademark from more than 10 years ago.

Contactors are mainly used to frequently connect or break AC and DC circuits. They have large control capacity and can be operated at long distances. With relays, they can achieve timing operation, interlock control, various quantitative controls and voltage loss. And under-voltage protection, it is widely used in automatic control circuits. Its main control object is the motor. It can also be used to control other electrical loads, such as electric heaters, lighting, welding machines, capacitor banks, etc.

①Electromagnetic system: The electromagnetic system includes an electromagnetic coil and an iron core, which is an important part of the contactor, relying on it to drive the closing and opening of the contacts.

②Contact system: The contact is the execution part of the contactor, including main contacts and auxiliary contacts. The function of the main contact is to connect and break the main circuit and control larger currents, while the auxiliary contact is in the control circuit to meet the requirements of various control methods.

③Arc extinguishing system: The arc extinguishing device is used to ensure that the arc generated when the contacts disconnect the circuit is reliably extinguished and reduces arc damage to the contacts.

In order to quickly extinguish the arc during disconnection, the contactor is usually equipped with an arc extinguishing device. Generally, a semi-enclosed longitudinal seam clay arc extinguishing cover is used, and is equipped with a strong magnetic arc blowing circuit.

①The rated current of the main circuit contacts should be greater than or equal to the rated current of the controlled equipment. The contactor for controlling the motor should also consider the starting current of the motor. In order to prevent the main contact ablation of frequently operated contactors, the rated current of frequently operated contactors can be reduced.

② The rated voltage of the electromagnetic coil of the contactor is 36V, 110V, 220V, 380V, etc. The electromagnetic coil is allowed to be used within the range of 80% to 105% of the rated voltage.