How contactors are used in automation?
Contactor Definition Contactors are a specialized form of relay capable of switching higher power loads such as motors, lighting and electric heaters. Turning large electrical power loads such as motors, lighting and heaters on and off is a common automation requirement.
What is important for operating a contactor with an external economizer?
Q: What is important for operating a contactor with an external-economizer? A: The operation of the external economizer should start only 100ms minimum after applying power to the coil. For the Pulse Width Modulation (PWM) TE recommends a minimum frequency of 20kHz. The magnetic force only depends on the coil current.
What is the purpose of high voltage contactor?
A high-voltage contactor, also called a high-voltage relay without distinction in the industry, is widely used in electric vehicles (EV) and hybrid electric vehicles (HEV). It is an electromechanical switching device with a coil to generate a magnetic force that mechanically operates an electric contact.
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 is the purpose of contactors?
A contactor is a special type of relay used for switching an electrical circuit on or off. They are most commonly used with electric motors and lighting applications.
What are the 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.
How many amps does a contactor coil draw?
The Coil does not draw . 5 amps or 55 watts.
Why do we use contactors?
A contactor is an electrical device which is used for switching an electrical circuit on or off. These contacts are in most cases normally open and provide operating power to the load when the contactor coil is energized. Contactors are most commonly used for controlling electric motors.
Why use an auxiliary contactor?
The auxiliary contact is often used in a relay logic circuit, or for some other part of the motor control scheme, typically switching 120 Volt AC power instead of the motor voltage. One contactor may have several auxiliary contacts, either normally-open or normally-closed if required.
What are the 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. Material for making contacts must have a high welding resistance and stable arc resistance.
What is the role of a contactor in a motor?
An electric contactor is a large relay for switching electrical loads on and off in motors and other high-power loads. IEC magnetic contactors provide precise ratings for power-circuit switching and automatic cutoffs during power failures.
Are there any high voltage contactors for cars?
Our Mini K HV pre-charge relays offer a cost-effective, safe, and lightweight solution for DC high-voltage power systems. Our automotive high-current contactors comply with demanding switching requirements of hybrid and electric vehicles, and fuel cell vehicles and charging systems.
How are IEC magnetic contactors used in industrial automation?
IEC magnetic contactors provide precise ratings for power-circuit switching and automatic cutoffs during power failures. NEMA magnetic contactors are commonly used as motor contactors and for switching heating loads, capacitors, and transformers in construction, infrastructure, oil and gas, and industrial automation applications.
How is a contactor used in a starter?
The most widespread switching device used in a starter is the a.c. air-break contactor which consists of contact assemblies actuated by electromagnetic action. An operating coil is enclosed by the magnetic yoke, and when energized attracts an armature to which is attached a set of moving contacts which make with a set of stationary contacts.
