Contactors and relays pdf

Contactor relays Contactor relays Contactor relays are often used in control and regulating functions. They are used in large quantities for the indirect control of motors, valves, clutches and heating equipment. Download this article in. Relays and contactors use a variety of technologies to switch signals and power connections.

Many devices called relays use similar techniques and topologies.

All About Contactors When a relay is used to switch a large amount of electrical power through its contacts, it is designated by a special name: contactor. Contactors typically have multiple contacts, and those contacts are usually (but not always) normally-open, so that power to the load is shut off when the coil is de-energized. Low-consumption versions for control relays and 9-38A contactors in ACduty.

Motor Starters, contactors , and relays all operate on the same basic principle. The first three steps for selection will be the same. Sometimes called “ice cube relays ” (because they are small and square and with clear plastic like an ice cube).

General Purpose Relays.

Contactor and relay are two terms often encountered when dealing with electric circuits. Both these devices are used for similar purposes and hence people are often confused about the difference between a contactor and a relay. The AF contactor technology revolutionizes how we use contactors and allows use in all parts of the world and in all network conditions. Furthermore, mini- contactor range offers compact dimensions and specific connection possibilities. The AS contactor is efficient and allows you to optimize your equipment design.

Relay is device having typically an electromagnet controlled contacts, actuated by electric signals in one circuit to control current or supply in another circuit. So it usually has a magnet coil, few contacts which may be one or more pairs of con. Competitive Prices on the Finest HVAC Service Products in the Industry! High Quality HVAC Service Products at Wholesale Prices.

This is to help protect the equipment downstream of the contactor from damage due to current. Overloads are much less common on relays. The relay is an automatic protective and switching device which is capable of sensing abnormal conditions in electrical circuits. These are operated to open or close the load contacts in response to one or more electrical quantities like voltage and current.

Latching relays - operate when impulsed by a signal voltage. The impulse can be provided via a pushbutton or switch.

To turn things on and off, we need devices that are switchable by the application of a current or voltage. Electrically, we have transistors and integrated circuits. Mechanically, we have relays and contactors. The main difference between contactors and relays is the loads that they are meant to handle.

To make the most, you need control. ABB 3-pole contactors offer an exhaustive selection of products for simple and extreme applications as well as products with specific purposes. Contactors and starters With a broad portfolio that includes everything from phase, voltage and current monitoring relays to motor protection breakers, Eaton offers the protection your system needs against equipment failure and danger caused by voltage faults, current conditions or excessive load requirements.