What is a DC contactor?
A DC contactor is an electrically controlled device designed to switch current on and off. DC contactors control current in DC circuits by closing and opening internal contacts. DC contactors control much lower voltages than AC circuits and offer the benefit of minimal arcing as the circuit opens and closes.
Where are DC contactors used?
DC contactors provide a cost-effective and reliable method to switch current in low-voltage DC circuits. Industries that use our DC contactors include (but are not limited to) agriculture & construction, lawn & garden, marine, mobile hydraulics, heavy trucks, and electric vehicles.
What are contactors used for?
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?
Hence, it is a very important component of the contactor. The contacts are classified as power contact, auxiliary contact, and contact spring. There are two types of power contact; stationary contact and movable contact. The material used for the contacts has stable arc resistance and high welding resistance.
What is AC and DC contactor?
An AC contactor comes with a short circuit ring at the end of the static core. It helps eliminate vibration and noise from the electromagnet. A DC contactor does not come with a short circuit ring as it does not need it. An AC contactor has a high starting current with a maximum operating frequency of 600 times/hour.
How do you test a DC contactor?
How to properly test a contactor – YouTube
What is the difference between AC contactor and DC contactor?
An AC contactor has a high starting current with a maximum operating frequency of 600 times/hour. That of a DC contactor is about 1200 times/hour. A DC contactor uses a magnetic quenching arc, while an AC contactor uses a grid arc as an extinguishing device.
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.
Can I use AC contactor for DC?
So AC contactors and DC contactors cannot be replaceable to each other. If we put the AC contactor in the DC circuit, it will burn out because of the excessive current. Because there is inductive reactance in alternating current but not in direct current.
What is 13 and 14 on a contactor?
Many contactor manufacturers use the designations A1 and A2 for the terminals that connect power to the magnetic coil. Likewise, many manufacturers use the designations 13 and 14 for the terminals of normally open auxiliary contacts. Auxiliary contacts are operated by the magnetic coil just like the main contacts.
Can DC contactor be used for AC?
If we put DC contactor in AC circuit, the DC contactor will not work because of the AC inductive reactance. There is fewer coil turns, higher impedance, lower current, and more noise in AC contactor.
Why is a DC contactor bigger than an AC contactor?
The number of turns of the DC low-voltage contactor coil winding is much more than that of the AC contactor coil, so the resistance value of the DC contactor coil is larger.
What is A1 and A2 on 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.
Can I use DC contactor for AC?
What is the symbol of contactor?
The contactor is designated as K and, in the coil symbol, the K1/4 indicates that there are four associated contacts. Sometimes the coil designation is placed beside the coil symbol. In this case there are three normally open power contacts, and one normally open control contact.
What is the difference between AC & DC contactors?
The DC contactor has a U shape, while the AC contactor has an E shape. The DC contactor has a maximum operating frequency of 1200 times per hour. In contrast, AC contactors have a maximum operating frequency of 600 times per hour. The AC contactor is designed to work at lower resistances, so they have fewer turns.
What is L1 L2 L3 In contactor?
The L1, L2, and L3 terminals are where the power wires connect to the contactor. The T1, T2, and T3 terminals are where the device wires connect to the contactor. The L1 contact connects to the T1 contact, the L2 contact connects to the T2 contact, and the L3 contact connects to the T3 contact.
What is 95 and 96 on a contactor?
The contact 95-96 is used to control the load contactor. The overload relays have a setting scale in Amperes, which allows the direct adjusting of the relay without any additional calculation.
Can I use AC contactors for DC?
What is difference between AC and DC contactor?
How contactor is connected?
What is T1 T2 T3 in contactor?
What is A1 and A2 in contactor?
What Do A1 and A2 Mean on a Contactor? A1 and A2 on a contactor typically refer to either end of the electromagnetic coil assembly. Most contactor manufacturers use A1 and A2 to designate the two terminals connecting electrical power to the contactor’s magnetic coil.