Difference between relay and contactor pdf files

Difference between contactors and relays electrical classroom. Difference between contactor and relay compare the. Relay a device by means of which contacts in one circuit are operated by a change in conditions in the same circuit or in one or more associated circuits contactor a device for repeatedly establishing and interrupting an electric circuit under normal conditions. Compact dimensions for the highest packing densities. En 606691 and en 6066922 for electromechanical step relays. In everyday applications there is cross over and no clearly defined difference between a relay and a contactor. What is the difference between a contactor and a relay. There is no electrical connection inside the relay between the two circuits the link is magnetic and mechanical only.

Basically a relay consists of an electromagnet coil, an armature, a spring and a series of. Difference between contactor and relay since a contactor is required for a higher load, a relay is always cheaper than a contactor. Beta machinedesign com sites machinedesign com files ssr diagram 2. Tesys lr2k is a range of thermal overload relays from 0. The basic principle of operation of the contactor and the relay are the same. The main difference between the contactor and relay is that, contactor is a high power device while relay is a low power device. Generally, relays are smaller than contactors, just as ponds are generally smaller than lakes. Browse our resource section and find the most useful tools and documents for all our products. Other relay variations include three and five pin relays. Contactors are used for loads that have high voltages, high currents, or both.

Shortcircuit protection of the contactors without overload relay, see technical. Nc8 series ac contactor is applied to circuits with ac current frequency of 50. Finder relays, general technical information finder relays and. Relays and contactors use a variety of technologies to switch signals and power connections. Basically, its just two different names for the same thing. A relay is normally used in appliances below 5kw, while a contactor is preferred when the appliance is heavier.

In addition to their current ratings and rating for motor circuit control, contactors often have other construction. A contactor is used for switching of motors, capacitors, lights etc, that drains very high current. These are operated to open or close the load contacts in response to one or more electrical quantities like voltage and current. It has at least a single pair of three phase input and output contacts. Discover schneider electric range of products in contactors and protection relays. A device for repeatedly establishing and interrupting an electric power circuit.

The relay is an automatic protective and switching device which is capable of sensing abnormal conditions in electrical circuits. Difference between contactor and relay difference between. There is nevertheless, some overlap between relays and contactors regarding. Some contactors come with additional auxiliary contacts that may be either no or nc. Both of them are electrically operated switches used for control and switching of loads. A device by which contacts in one circuit are operated by a change in conditions in the same circuit or in one or more associated circuits.

Load capacity contactors are used in control circuits with both low and high ampere capacity that is between 15a to 12500a. Relays allow one circuit to switch over to a second circuit that can be completely separated from the first. Current splits inside the relay, supplying power to both the control and load circuits. The difference between a contactor and a relay is the same difference as between a lake and a pond. The different voltage wiring connected to the relay must also be. Deviating dimensions for auxiliary contactors with cage clamp terminals on. There is nevertheless, some overlap between relays and contactors. Contactors are used for devices that pass more than 15 amps or loads of more than 3kw.

The main difference between contactors and relays is the loads that they are meant to handle. Here are a few of the basic differences that distinguish different types of relay and contactor switches. Contactors and protection relays schneider electric. What is the difference between relay and contactor answer pankaj.