What is the working principle of contactor?
What is the working principle of contactor?
Operating Principle of a Contactor:The current passing through the contactor excites the electromagnet. The excited electromagnet produces a magnetic field, causing the contactor core to move the armature. A normally closed (NC) contact completes the circuit between the fixed contacts and the moving contacts.
What is the function of contactor relay?
A contactor is a large relay, usually used to switch current to an electric motor or another high-power load. Large electric motors can be protected from overcurrent damage through the use of overload heaters and overload contacts.
What is the advantage of contactor?
Advantages of contactors include: Protection. Simple Operation. High-load capacity.
What is magnetic contactor and how it works?
Magnetic contactors are a form of electrical relay found on most electrically powered motors. They act as a go-between for direct power sources, and high-load electrical motors in order to homogenize or balance out changes in electrical frequency which may come from a power supply as well as to act as a safeguard.
How does a 3 phase contactor work?
A three-phase contactor is an electronic device used to turn power on or off at a three-phase load. A contactor uses a low-voltage signal to control the high-voltage circuit. This low-voltage signal can be controlled by an electrical relay or a computer.
What is difference between contactor and relay?
Control Relay: It is a device through which contacts in one circuit are operated by an alteration in conditions in the same circuit or in associated circuits. Contactor: It is a device which is used for repeatedly establishing and interrupting an electric circuit under normal conditions.
What is different between contactor and relay?
What is the main difference between a relay and a contactor?
A contactor joins 2 poles together, without a common circuit between them, while a relay has a common contact that connects to a neutral position. Additionally, contactors are commonly rated for up to 1000V, while relays are usually rated to only 250V.
What is auxiliary contactor?
Basically, an auxiliary contactor is a regular (low-power) relay – but built like a “regular” contactor and when used together with another contactor it is called auxiliary contactor to clarify that it is not used for switching loads but has an activation/deactivation or control function instead – used to connect/ …
What are A1 and A2 on a contactor?
One side of the contactor coil (A2) is connected directly to one of the incoming power lines. The other side of the coil (A1) has two possible pathways to complete a connection to the other incoming power line.
What are two basic types of contactors?
There are different types of contacts in a contactor, and they are; auxiliary contact, power contact, and contact spring. The power contact has two types that are; stationary and movable contact.
What is the load side of a contactor?
The load side is where the power leaves the device (or electrical box) and travels down the circuit.
Working Principle of Contactors: The time supplied to the contactor generates an electromagnetic field and the fixed coil and the moving coil are attracted to one another. Initially, the current of the electromagnetic field is only more.
How many types of contactors are there in a transformer?
The contactor consists of two iron cores, where one is fixed and the other one is the movable coil and it is an insulated copper coil. Where the copper coil is located on the fixed core. There are six main contacts for power connection, where three are fixed cores and the other three are movable cores.
How does a PLC contactor work?
When this happens, the feedback contact will be closed as well and a signal will be sent to the PLC input, telling us that the contactor is working properly. When you press the stop switch, the coil will be de-energized, the contact will open and the motor will turn off.
How to connect a 24-volt DC coil to a contactor?
On the front of the contactor, you’ll see two wire terminals of A1 and A2. This is where we can connect a 24-volt DC power to the coil to energize it. The A1 wire terminal is where the 24-volt DC positive signal wire gets connected and the A2 wire terminal is where the 24-volt DC negative signal wire gets connected.
