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 high-voltage contactor?
TDK High Voltage Contactors (HVC) are designed to meet the requirements of high-voltage DC switching applications. The contactors are hermetically sealed for excellent reliability in harsh environments and have high-speed arc extinguishing.
How does a contactor work?
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.When current is removed, the coil is de-energized and opens the circuit.
How does a 4 pole contactor work?
4 pole contactors are electrically controlled switches (relays) 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 220-volt motor switch.
What does the DC contactor box do?
DC contactors are electrical switching devices, similar to a relay. Contactors can handle much higher current levels than standard relays, which makes them useful for mobile equipment applications.
What are DC contactors?
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.
Why would you use a contactor?
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 is the difference between AC contactor and DC contactor?
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 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. Material for making contacts must have a high welding resistance and stable arc resistance.
How many amps does a contactor coil draw?
04 amps or about 4 watts.
Can a 220V contactor operate a three phase motor?
To use 3 phase motor on 1 phase power supply, we can connect any 2 phase winding coils in series, and then connected to the other phase.If you do not want to increase the voltage, the 220V power supply can use this too.
What happens when the coil of a contactor is energized?
Operating Principle of a Contactor:
The energized electromagnet then creates a magnetic field. This causes the core of the contactor to move the armature. The circuit is then completed between the fixed and moving contacts by a normally closed (NC) contact allowing the current to pass through the contacts to the load.
How does a 120v contactor work?
Contactors use 120 volt standard power to energize a magnetic coil, which causes a set of internal contacts to close and provide higher power to the equipment.
What is the difference between a 3 pole and 4 pole contactor?
A 3-pole isolator is no-load switch with isolating only 3-phases while a 4-pole isolator is no-load switch with isolating 3-phases and a neutral of 3-phase line.
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.
Does contactor have polarity?
Polarized: The power terminals on polarized contactors are labeled positive (+) and negative (-). This designation is intended to guide in the proper installation of the product. Most contactors have internal arc blow-out magnets which are used for breaking loads (opening while current is flowing).
Is a contactor a sealed unit?
Open/Closed Contact Standards
Contactors are almost exclusively designed to operate with normally open (Form A) contacts. Relays on the other hand can and often are both Normally Open and/or Normally Closed depending on the desired function.
Will a DC coil work on AC?
You can use AC coils on DC circuits providing you apply enough DC voltage to draw the same amount of current as when operating on AC.
What is DC relay?
Direct current (DC) is steady and never reverses. A DC relay uses a single coil of wire wound around the iron core to make the electromagnet. When the DC coil is energized, the magnetism generated in the core is steady because the DC just keeps going.
Why do motors need contactors?
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.
How does a circuit breaker work?
Circuit breakers interrupt the flow of electrical current when it exceeds a predetermined amount, which is where a circuit breaker’s ratings come into play. Circuit breakers are rated based on the amount of current that they can safely carry and the amount they can safely interrupt.
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