What is the purpose of contactor?
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 is the main advantage of using a lighting contactor?
Lighting contactors are used to switch power in high current circuits, and can have a single or multiple points of contact. Designed to handle and switch large lighting loads, lighting contactors are designed to be extremely durable and should easily last you a few years before you’ll need to replace it.
What is the difference between a lighting contactor and a definite purpose contactor?
Unlike General purpose contactors, which are rated typically based on HorsePower (HP) of the motor, Definite Purpose contactors are rated on Motor Full Load Amps (FLA). DP contactors often have limitations on the maximum Locked Rotor Amps (LRA) it can handle.
What is difference between relay and 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 the difference between a contactor and a switch?
A contactor is an electrically-controlled switch used for switching an electrical power circuit. A contactor is typically controlled by a circuit which has a much lower power level than the switched circuit, such as a 24-volt coil electromagnet controlling a 230-volt motor switch.
How do you size a lighting contactor?
There are 5 primary things to consider when determining how to size a contactor for your application:
- Full Load Amperage at Line Voltage. The first item to consider is the load, which is measured in amperes.
- Contactor Coil Voltage.
- IEC Utilization Categories.
- Reversing vs Non-Reversing Contactors.
- Auxiliary Contacts.
What are the different 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.
Why use a contactor instead of a switch?
Why are Contactors Used? Contactors are used for high power applications. They allow a lower voltage and current to switch a much higher power circuit, so they are generally larger and more heavy-duty than control relays, enabling them to switch higher power loads on and off for many thousands of cycles (Figure 1).
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.
How contactor is connected?
Break your circuit, L N E through your contactor. Link a permanent live and a neutral from your supply to your coil (Al + A2) then use your switch feed to your photocell from A1, and switch the wire to the switched phase of your contactor load. This should now open when light, close when dark.
What is difference between contactor and relay?
How many Poles does a lighting contactor have?
For field conversion, there is a maximum of eight N.C. poles for Type L (electrically held) and a maximum of six N.C. poles for Type LX (mechanically held) contactors.
How are lighting contactors rated?
Lighting contactors can be divided into three general categories: feeder disconnect type 2-, 3-, and 4-pole lighting contactors rated up to 2250 A to control large blocks of load, multi-pole lighting contactors with as many as 12 poles rated 20… 30 A for multi-branch circuit control, and industrial relays rated 20…
What is the difference between a contactor and a relay?
How do you wire a lighting contactor?
how to wire lighting contactor – shapovmusic.com. 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. 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.
What are the functions of a contactor?
The contactor is used for high voltage switching applications and the relay is used for low voltage switching applications.
What is a contactor and how does it work?
Coil terminals On the front of the contactor,you’ll see two wire terminals of A1 and A2.
What is the difference between a relay and a contactor?
– The most compact in size and light in weight. – A large number of contacts with high switching capacity. – ‘Snap-fit’ arrangement of various parts. – ‘Push-on’ type contacts for quick modification/replacement at the site. – Very high endurance for the high frequency of operations.