What carries a contactor?

What carries a contactor?

A contactor has three components. The contacts are the current-carrying part of the contactor. This includes power contacts, auxiliary contacts, and contact springs. The electromagnet (or “coil”) provides the driving force to close the contacts.

How are contactors selected?

The choice of contactor is dependant upon many parameters i.e. operating voltage, size of contacts, number of operations, ambient temperature, type of load supplied etc. Loads are categorised into various AC ratings, (AC1, AC2, AC3 etc.) and the higher the AC rating the more inductive the load becomes.

What are electric 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.

How do you select a contactor for a motor?

As per above chart:

1. Type of Contactor = AC7b.
2. Size of Main Contactor = 100%X Full Load Current (Line).
3. Size of Main Contactor = 100%x6 = 6 Amp.
4. Making/Breaking Capacity of Contactor = Value above Chart x Full Load Current (Line).
5. Making/Breaking Capacity of Contactor = 8×6 = 52 Amp.

What is the difference between a contactor and a solenoid?

A primary advantage of solenoids is their ability to use a low input to generate a larger output via the coil, thus reducing strain on the battery. The contactor is the relay to use when a circuit must support an even heavier current load (typically 100-600 amps).

What is definite purpose contactor?

Definite purpose contactors and starters are electrically operated switching devices specifically designed for the heating, ventilation, air conditioning and refrigeration (HVAC) industry. They are subjected to stringent quality assurance inspections and testing procedures.

Where are contactors used and where are relays used?

Relays are switching devices used in any control circuit for checking a condition or multiplying the number of contacts available. Contactors are switching devices used to control power flow to any load. Mainly used in control and automation circuits, protection circuits and for switching small electronic circuits.

Are contactors normally open or closed?

Control Relays can and often are both Normally Open and/or Normally Closed depending on the desired function. Contactors, on the other hand, are almost exclusively designed to operate with normally open (Form A) contacts.

What are the different types of contact in a contactor?

Contacts: This is yet another important component of this electrical device. The current carrying task of the contactor is done by the contacts. There are different types of contacts in a contactor namely, contact springs, auxiliary contacts, and power contacts. Each type of contact has an individual role to play.

What should the voltage of a IEC contactor be?

Generally, coil voltages are 250V or below. IEC uses utilization categories, or “codes”, to describe specifically the type of electrical load and duty cycle of the load (s). This is important because these will in part, determine which contactor you use.

How is an auxiliary contact used in a 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.

How are contactors used in a relay circuit?

All About Contactors. 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.