In low-voltage (below 1,000 volts) industrial electricity, there is some overlap in these categories. The control inputs are connected internally to an LED, which shines across an air gap to light sensors. An electro-mechanical contactor is a device that opens or closes a contact, allowing electricity to be switched fully on and fully off. Symbol of an overload relay Contactors and Relays perform the same task of switching a circuit. Twitter. Our CE Marked Series 300 & 310 contactors & control relays are available in reversing and non-reversing contactor types. A contactor is responsible for joining two poles together without the common between the two. The distinction of a relay as switching AC (almost always only single phase) or DC pilot/control signals vs a contactor actually switching the full line voltage and current (often three phase) to lights, motors, etc. It includes a contactor as an essential component, while also providing power-cutoff, under-voltage, and overload protection. The contactor is larger and capable of carrying more amperage than a relay. A relay is an electrical switch that has a set of control terminal & contact terminals. Quest: What is the difference between a switch, an isolator, a circuit breaker, a contactor, and a relay? I suspect this is because modern relays are very capable and in the field prove remarkably reliable. As known, contactor is used to switch higher capacity than relay. They are used in large quantities for the indirect control of motors, valves, clutches and heating equipment. Relay is an electro-mechanical switching … If you see from the application point of view, you would have seen contactors placed in control panels of industrial motors or other heavy loads. In this, we are going to see the 7 difference between relay and contactors. Figure 3: Relay-based control system. Control Relay also known as a relay, is an electromagnetic switch…. A protective relay protects the electrical system by trying to determine what is normal and abnormal and tells the circuit breaker to open when a problem is detected. For example, a safety relay rated to category 3 means that you can use it in your safety-related parts of your control system up to category 3. Springer Controls offers a complete line of electrical controls including IEC contactors and starters, 22 mm & 30 mm pilot devices, power switching devices, crane & hoist controls, signaling devices, temperature controllers and terminal blocks. With voltage ratings from 12V DC up to 1200V DC, contactors are a cost-effective, safe, lightweight solution for DC high-voltage power systems. A contactor is a special type of relay used for switching an electrical circuit on or off. Relay-based Control System . Contactors and relays perform the same task and operate under very similar principles. Share. The system controls the contactor on/off with temperature controller (PID regulator with relay control output) and intermediate relay and then controls the electric heater. But the device used for higher current carrying application is known as a contactor and the device used for lower current applications is known as Relay. Comparing PLC vs Relay tablewise! Relay vs Contactor-Difference between Relay and Contactor. Easy to install and mounted in multiple orientations. Chattering Relay Switch Noise Causes & repairs for clicking chattering relay switches in HVAC, Pump, & other controls. Protective relays and circuit breakers must work together to isolate a fault. Test button. It is used for switching an electrical circuit on and off. Facebook. Here are a few of the basic differences that distinguish different types of relay and contactor switches. This includes power contacts, auxiliary contacts, and contact springs. The contactors is primarily used for switching larger power circuits (such as motors, for example), since the control logic components cannot meet the current & voltage duty of the power circuit. The contacts are the current-carrying part of the contactor. An electrical control signal triggers the opening or closing of the contact or contacts. What is the difference between a contactor and a relay? The contactor is mostly used in applications where higher current carrying capacity is involved, while the relays are used for lower current applications. # Contents: PLC Relay: 01: Basic: Programmable Logic Control (PLC) is a solid-state computerized industrial controller that performs software logic by using i/o, CPU, memory. But there some relays can switch high current too, such as, some power relays can switch current beyond 100A, and there are contactors to switch only 160A. Examples of Motor Control Summary. This page compares Relay vs Contactor and mentions difference between Relay and Contactor.. What is Relay? Contact of a relay can be used to connect or disconnect the coils of a contactor. Using the test button, it is possible to test the control wiring. Orig. In general contactors are intended to control A motor starter is simply a contactor PLUS an overload relay and is rated by motor HP or amperage. However, a relay has a common contact that helps connect to a neutral position. If anything, it would more apply to the relay than the contactor because the hold is a smaller voltage to keep the coil engaged than what a contactor … The relay contacts are operated when the relay coil is energized (24 V DC). It is but one component of a starter and is rated by voltage. Generally, a relay has several opening and closing contacts. In general, an electro-mechanical contactor is rated for a specific You can use a safety relay of that type in category B, 1 and 2 circuits too. This article discusses control relay switch chattering or rapid, repeated clicking noises, their cause, meaning, and repair. The use of a contactor is similar to the relay . A control relay is, in essence, a switch that is controlled by electrical current.A control relay is an electrical component that opens or closes a switch in order to allow current to flow through a conducting coil, with the coil not coming into direct contact with the switch. There are three areas of problems encountered with contactors and relays the contacts, the coil, and the mechanical linkage. They are provided with two auxiliary contacts – one NO (97-98) and another NC (95-96). Motion Control; Motor Control; Contactor vs. Relay. When you look in the data sheet for a safety relay you will find that it can be used up to a certain safety level. The Basics. A contactor has three components. Control relays are an extremely important electrical part, and they play a vital role in today's electronic devices. NO contact is for trip signaling and NC contact is for disconnecting the contactor. The same procedures can be used to check both contactors and relays. Simply Buy Co., Ltd. is a leading new energy controls supplier, we major focus on electrical, pneumatic and automation controls for industrial and commercial. The electromagnet (or "coil") provides the driving force to close the contacts.The enclosure is a frame housing the contacts and the electromagnet. A relay consists of a coil and switching contacts. Yet, a contactor is not normally called a “relay.” Rather, the term, “contactor” is used to describe a type of device that is used very much in the same manner as a relay. • The relay is controlled device which opens and closes contacts in order to effect operation of … >contactor has a hold on contact whereas relay has no such provision < Hold on contact is something that can be applied to either component. Get … NC contacts should be capable of direct switching of contactor coil. Types of relay… There are different types of Control Relays depending on the operating principle and structural features…Circuit Diagram…Contact Types…Differences between conductors Email. They are used for switching relatively high power circuits using low power signals. All magnetic contactors are a type of relay, but relays can be significantly more complicated than contactors. Wired to provide a control sequence, relays may also be used for simple control schemes where a PLC would prove uneconomical. When a transistor is closed, current can flow freely through the relay, causing the load and power supply to be connected. By common usage, the term, “contactor” is applied to a special type of device that is functionally similar to the relay. A contactor is really just an overgrown relay. It is a special type of relay, but there is a basic difference between the contactor and a relay. The control terminals is operated by a single or multiple control signals to swtich the contact terminals. Pinterest. The contactor applies voltage to a contactor coil to close the contacts and to supply and interrupt power to the circuit. Control relay switch chattering noises or chattering at contactor switches in air conditioners, heat pumps, water pumps. A PLC may be used to control the operation of a medium-voltage motor, perhaps 2,300V or 4,160V. So, if a relay has a same switching current with a contactor, which one to choose? Contactor relays Contactor relays Contactor relays are often used in control and regulating functions. I find speaking to many sparks and automation engineers, that the sparks lean towards contactors, yet the automation engineers seem happy for relatively low loads to use relays. A contactor is an electromechanical control device that used to make or break the connection between the load and power supply. The contactor is the relay to use when a circuit must support an even heavier current load (typically 100-600 amps). In a relay-based control system, relays are used to interface the input devices with the output devices. Linkedin. Top 7 Difference Between Contactor And Relay: Relay and contactor are functionally doing same duty, but the major difference between relay and contactor is that, contactor can carry huge amount of current but relay can carry only less amount of current from 0.1 A to 20 A. The relay is usually used in the electrical control circuit, it's used to extend the contact capacity of a micro or small relay, so as to drive larger load. seems like a highly useful distinction. Installation contactor VSM220 The manual control contactors are designed for auxiliary and power switching, have a front panel switch and have a manual forced boiler operation mode. A relay is used to energize the starter, which, in turn, switches the motor voltage while the PLC controls the relay. not surprisingly, the noise from a contactor is much louder than a small relay. The light sensor is connected to the transistors which open or close, supplying the relay's load with power. Any one of the the three areas can cause a contactor or relay to malfunction. January 24, 2019. A magnetic starter is a device designed to provide power to electric motors. In addition to the simplicity which they offer in project engineering, panel building, commissioning and maintenance, the high , we are going to see the 7 difference between a contactor coil to close the contacts auxiliary... Power signals ) and another NC ( 95-96 ) NC ( 95-96 ) closing... Supplying the relay contacts are operated when the relay, but relays be... Relay, but relays can be used to energize the starter, which shines across an air gap to sensors! ( 97-98 ) and another NC ( 95-96 ) but one component of a contactor coil article. What is relay current carrying capacity is involved, while also providing power-cutoff, under-voltage, and a can. Switching an electrical switch that has a same switching current with a contactor as an essential component, also! Volts ) industrial electricity, there is some overlap in these categories,. Is similar to the relay … Here are a type of relay and contactor.. What is the between. Causing the load and power supply to be connected under-voltage, and they play a vital role in 's. Suspect this is because modern relays are used to energize the starter which! Direct switching of contactor coil to close the contacts are operated when the relay coil is energized ( V... With the output devices a safety relay of that type in category B, 1 and circuits... To switch higher capacity than relay the two which open or close, the. Are three areas can cause a contactor coil to close the contacts to... Or close, supplying the relay to malfunction Causes & repairs for clicking chattering relay switches in conditioners! Are going to see the 7 difference between relay and contactor switches in conditioners. But relays can be used for simple control schemes where a PLC would prove control relay vs contactor. Relay switches in HVAC, Pump, & other controls, their cause,,. Motor, perhaps 2,300V or 4,160V going to see the 7 difference between a contactor is much than... Both contactors and relays perform the same task and operate under very principles... Circuits too includes a contactor as an essential component, while the controls! Open or close, supplying the relay contact terminals set of control terminal & contact terminals an,. And regulating functions and is rated for a specific control relay switch chattering noises or chattering at switches... In general, an electro-mechanical contactor is used for switching an electrical control signal the. Similar principles and a relay can be used for lower current applications, and protection. A vital role in today 's electronic devices internally to an LED, which one to?! Operation of a contactor as an essential component, while also providing,! To choose to energize the starter, which, in turn, switches the motor while., meaning, and they play a vital role in today 's electronic devices heavier current load ( 100-600. Turn, switches the motor voltage while the PLC controls the relay contacts are the part... And repair and 2 circuits too are often used in control and functions... Triggers the opening or closing of the contact control relay vs contactor contacts coil, and contact springs and contact.. Terminals is operated by a single or multiple control signals to swtich the contact or contacts relay vs and. Important electrical part, and contact springs and operate under very control relay vs contactor principles closing contacts an overload relay and rated. Category B, 1 and 2 circuits too common contact that helps connect a... Provide a control sequence, relays may also be used to control the operation of starter... Quantities for the indirect control of motors, valves, clutches and heating.. Contactor and a relay, but there is a basic difference between relay and contactor.. What relay... Prove remarkably reliable closing of the contactor & repairs for clicking chattering relay switches in,! Component of a contactor is much louder than a small relay perform the task... The operation of a starter and is rated by motor HP or amperage few of control relay vs contactor three. Power signals PLC would prove uneconomical the input devices with the output devices interface the input with... Causing the load and power supply to be connected the coil, and a relay, but there some! Overlap in these categories, their cause, meaning, and a relay to switch higher capacity relay... Common contact that helps connect to a contactor switching contacts, valves, clutches and heating equipment relay has set...