What is the AC Contactor’s Operating Principle?

The electromagnetic outside ac unit contactor has three poles, a NO main contact, and air as the arc extinguishing medium. Coil, short-circuit ring, moving contact, static contact, auxiliary NO contact, auxiliary NC contact, pressure spring sheet, response spring, buffer spring, and arc extinguishing device are some of its components. There are original components on the cover. Below is shown the appearance structure of the common AC contactor in the figure:

Meba Air Conditioner Contactor Relay MBK3-3P30A

System of electromagnetic waves Coil, a static iron core, and a moving iron core are all part of it.

Contact system: It has both primary and secondary contacts. The main contact connects and disconnects the main circuit while allowing a greater current to flow through. One of the technical characteristics of the contactor is often the maximum current permitted by the primary contact (also known as the rated current). When in operation, auxiliary contacts are typically wired to the control circuit and are only permitted to carry very tiny currents.

The auxiliary connections on AC contactors can either be NO or NC contacts, whereas the main contacts are often NO contacts. Four auxiliary contacts are present in a contactor with a lesser rated current, whereas six auxiliary contacts are present in a carrier ac contactor with a greater rated current.

Meba Air Conditioner Contactor Switch MBK3-2P40A

The NO contact designates that the coil’s moving and static contacts are open while it is not activated and that the coil is closed when it is energized.NC contact denotes that the moving and static contacts are closed when the coil is not energized, and they are disconnected when the coil is energized.

When the primary contact is severed, the arc extinguishing device’s job is to swiftly stop the arc. As a result, arc extinguishing mechanisms are often present on AC contactors. Arc extinguishing grids are frequently utilized with AC contactors of greater capacity.

The illustration below depicts the basic operational structure of the aircon contactor. The armature is drawn to move downward when the coil is ignited, opening the usually closed contact and closing the normally open contact. The magnetic force is lost when the coil is de-energized. The response spring causes the armature to return to its initial position and the contact to take on its initial condition.

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All about the Basics and Components of Contactor

A contactor is a component that is needed to switch an electrical circuit on or off. It is said to be a part of the relay family, but the main difference is that they are used for applications or in circuits that need more current. To lighting circuits or electrical motors outside ac unit contactor are generally used to supply power.

Within an electrical system or electronic circuit, contactors include multiple contacts which are used to control other components and send signals. The contacts are usually normally opened but can be normally closed also. Typically, when the contactor coil has been energized, the contacts are used to supply the power to the load.

The presence of a high current load is the most common application for contactors. An example of this is the power supply to an electrical motor. When they are interrupted an electrical motor produces arcs. We minimize the number of arcs and control them to be safe by using a contactor.

Carrier ac contactor is designed so that they can get easily mounted and small so they can be fitted into control panels and circuits. In a range of different amp (A) ratings and voltage (V) ratings, they are available.

Major Components of a Contactor

Contactors are not just one component; they are prepared from a series of components. Three main components are needed by contactors. Below you can have a look at them:

Enclosure Or Body

A form of insulation and protection is provided by the enclosure of a contactor. This makes sure that with the contacts or coil the personnel will not come into contact. Generally, from a plastic such as a polycarbonate, the enclosure is prepared.

Contacts

The contacts are the part of the contractor and it carries the current. Several various contacts can feature inside/on a contactor, contact springs, aux or auxiliary contacts, and power contacts. Usually, the contact configuration of a contactor is open (NO) but can also be normally closed (NC).

Coil In the component, the coil is the most important part as it is the part that is needed to close the aircon contactor contacts. The coil is not visible as in an enclosure it is protected.

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