Contents
What is the purpose of auxiliary contacts 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 does a coil 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.
Does a contactor have a coil?
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.
What is the physical difference between the main and auxiliary contacts of a contactor?
Main contacts are designed to carry high voltage and high current whereas auxiliary contacts are designed for low voltage and low current only. 4. There is a chance of sparking in main contacts as it carrying a high current but in auxiliary contacts, there is no chance of sparking.
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.
What’s the difference between a relay and a contactor?
Control Relay: It is a device through which contacts in one circuit are operated by an alteration in conditions in the same circuit or in associated circuits. Contactor: It is a device which is used for repeatedly establishing and interrupting an electric circuit under normal conditions.
What is an auxiliary contact on a breaker?
Auxiliary contacts monitor Eaton circuit breakers and provide a signal to outside equipment when the breaker trips. In the event of an overcurrent or short circuit, these contacts and switches keep workers and equipment safe by sounding an alarm, initiating a shutdown, or starting up a backup power source.
What do the numbers on a contactor mean?
The different models can be identified by the numbers on the contactor: If there are one-digit numbers (1-6) it is a model with operating contacts (which are used to switch drives or lighting). Two-digit numbers (e.g. 13/14) indicate a model with auxiliary contacts (which are used e.g. in industrial system controls).
Which is an example of an auxiliary contact?
The N/C contacts are, for example, used as electrical interlocks where two contactors are used for forward/reverse operation. The control circuit for one contactor will run through the N/C auxiliary on the other.
What are the different types of contactors do?
A power Contactor have 3 main contacts while a auxiliary contactor have many contacts like 1NO+1NC, 2NO+2NC ect….Power contactor is generally used where we reuired to make and break a large current carring circuit. A Contactor is a electromagnetic device which is used to make or break of any electrical circuit. there are two type of Contactor.
What’s the difference between a regular contactor and an auxiliary contactor?
On the hand, Auxiliary contactors are designed for switching currents of only up to 6 A. An auxiliary contactor is a regular (low-power) relay – but built like a “power” contactor and when used together with another contactor it is called auxiliary contactor.
What are the auxiliary contacts of a circuit breaker?
Main circuit switching devices, such as circuit breakers and contactors, often require additional switching functions over and above those of their primary contacts. These include remote indication of their status, trip function indication, electrical interlocks, and start circuit retainers.