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Series AC contactors are mainly used in circuits with AC (or rated insulation voltage of 0.0000000000. The overload relay forms an electromagnetic starter to protect circuits that may be overloaded.
Structural features and working principles
The contactor is mainly composed of the electromagnetic system, contact system, arc extinguishing system and other parts.
① Electromagnetic system The electromagnetic system includes the electromagnetic coil and the 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 contacts are the executive part of the contactor, including the main contact 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 loop 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 open the circuit is extinguished reliably and to reduce the damage of the arc to the contacts. In order to quickly extinguish the arc when disconnecting, contactors are usually used
They are all equipped with arc extinguishing devices, generally using semi-enclosed longitudinal seam clay arc extinguishing covers and equipped with strong magnetic arc blowing circuits.
④Other parts include insulating shells, spring short-circuit ring transmission mechanisms, etc.
Series Working principle of AC contactor
When the contactor electromagnetic coil is not energized, the reaction force of the spring and the self-weight of the armature core keep the main contact in the off position. When the electromagnetic coil is connected to the control voltage through the control loop (generally
is the rated voltage), the electromagnetic force overcomes the reaction force of the spring and attracts the armature to the static core, driving the main contact to close, connecting the circuit, and the auxiliary contact moves accordingly.
Series AC contactor models
Circle voltage
Constant current
LC1-E2510 Contactor Technology Community