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control relay vs contactor

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. Relay-based Control System . Simply Buy Co., Ltd. is a leading new energy controls supplier, we major focus on electrical, pneumatic and automation controls for industrial and commercial. 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. The same procedures can be used to check both contactors and relays. The control terminals is operated by a single or multiple control signals to swtich the contact terminals. An electro-mechanical contactor is a device that opens or closes a contact, allowing electricity to be switched fully on and fully off. Contactors and relays perform the same task and operate under very similar principles. >contactor has a hold on contact whereas relay has no such provision < Hold on contact is something that can be applied to either component. 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 relay is controlled device which opens and closes contacts in order to effect operation of … 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. I suspect this is because modern relays are very capable and in the field prove remarkably reliable. With voltage ratings from 12V DC up to 1200V DC, contactors are a cost-effective, safe, lightweight solution for DC high-voltage power systems. In this, we are going to see the 7 difference between relay and contactors. A relay is an electrical switch that has a set of control terminal & contact terminals. It is a special type of relay, but there is a basic difference between the contactor and a relay. Figure 3: Relay-based control system. Pinterest. 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. 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 … 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. It includes a contactor as an essential component, while also providing power-cutoff, under-voltage, and overload protection. Using the test button, it is possible to test the control wiring. In general, an electro-mechanical contactor is rated for a specific 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. A motor starter is simply a contactor PLUS an overload relay and is rated by motor HP or amperage. As known, contactor is used to switch higher capacity than relay. Our CE Marked Series 300 & 310 contactors & control relays are available in reversing and non-reversing contactor types. So, if a relay has a same switching current with a contactor, which one to choose? Comparing PLC vs Relay tablewise! The control inputs are connected internally to an LED, which shines across an air gap to light sensors. Contactors and Relays perform the same task of switching a circuit. A PLC may be used to control the operation of a medium-voltage motor, perhaps 2,300V or 4,160V. 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 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. Get … 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. In a relay-based control system, relays are used to interface the input devices with the output devices. A contactor is really just an overgrown relay. A contactor has three components. Twitter. You can use a safety relay of that type in category B, 1 and 2 circuits too. All magnetic contactors are a type of relay, but relays can be significantly more complicated than contactors. Chattering Relay Switch Noise Causes & repairs for clicking chattering relay switches in HVAC, Pump, & other controls. 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. The contactor is larger and capable of carrying more amperage than a relay. 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. A contactor is responsible for joining two poles together without the common between the two. The light sensor is connected to the transistors which open or close, supplying the relay's load with power. The electromagnet (or "coil") provides the driving force to close the contacts.The enclosure is a frame housing the contacts and the electromagnet. Motion Control; Motor Control; Contactor vs. Relay. not surprisingly, the noise from a contactor is much louder than a small relay. The contacts are the current-carrying part of the contactor. Linkedin. Control relay switch chattering noises or chattering at contactor switches in air conditioners, heat pumps, water pumps. Wired to provide a control sequence, relays may also be used for simple control schemes where a PLC would prove uneconomical. A relay is used to energize the starter, which, in turn, switches the motor voltage while the PLC controls the relay. NO contact is for trip signaling and NC contact is for disconnecting the contactor. Protective relays and circuit breakers must work together to isolate a fault. It is but one component of a starter and is rated by voltage. January 24, 2019. They are provided with two auxiliary contacts – one NO (97-98) and another NC (95-96). A contactor is an electromechanical control device that used to make or break the connection between the load and power supply. Here are a few of the basic differences that distinguish different types of relay and contactor switches. The use of a contactor is similar to the relay . The Basics. 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. When a transistor is closed, current can flow freely through the relay, causing the load and power supply to be connected. In low-voltage (below 1,000 volts) industrial electricity, there is some overlap in these categories. Easy to install and mounted in multiple orientations. Contact of a relay can be used to connect or disconnect the coils of a contactor. A contactor is a special type of relay used for switching an electrical circuit on or off. The contactor applies voltage to a contactor coil to close the contacts and to supply and interrupt power to the circuit. They are used in large quantities for the indirect control of motors, valves, clutches and heating equipment. Any one of the the three areas can cause a contactor or relay to malfunction. The contactor is mostly used in applications where higher current carrying capacity is involved, while the relays are used for lower current applications. This includes power contacts, auxiliary contacts, and contact springs. This page compares Relay vs Contactor and mentions difference between Relay and Contactor.. What is Relay? Generally, a relay has several opening and closing contacts. 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. NC contacts should be capable of direct switching of contactor coil. Examples of Motor Control Summary. Orig. Contactor relays Contactor relays Contactor relays are often used in control and regulating functions. An electrical control signal triggers the opening or closing of the contact or contacts. In addition to the simplicity which they offer in project engineering, panel building, commissioning and maintenance, the high They are used for switching relatively high power circuits using low power signals. 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. Control relays are an extremely important electrical part, and they play a vital role in today's electronic devices. In general contactors are intended to control Control Relay also known as a relay, is an electromagnetic switch…. Email. 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. A magnetic starter is a device designed to provide power to electric motors. Symbol of an overload relay seems like a highly useful distinction. By common usage, the term, “contactor” is applied to a special type of device that is functionally similar to the relay. What is the difference between a contactor and a relay? Test button. Relay vs Contactor-Difference between Relay and Contactor. Relay is an electro-mechanical switching … The contactor is the relay to use when a circuit must support an even heavier current load (typically 100-600 amps). Quest: What is the difference between a switch, an isolator, a circuit breaker, a contactor, and a relay? However, a relay has a common contact that helps connect to a neutral position. Facebook. Share. It is used for switching an electrical circuit on and off. The relay contacts are operated when the relay coil is energized (24 V DC). 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. This article discusses control relay switch chattering or rapid, repeated clicking noises, their cause, meaning, and repair. # 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. A relay consists of a coil and switching contacts. There are three areas of problems encountered with contactors and relays the contacts, the coil, and the mechanical linkage. To energize the starter, which shines across an air gap to light sensors remarkably reliable uneconomical. In this, we are going to see the 7 difference between two! Circuit breaker, a contactor control relay vs contactor relay to use when a circuit must support even... Here are a type of relay used for simple control schemes where a PLC would prove uneconomical to. Low-Voltage ( below 1,000 volts ) industrial electricity, there is a special type relay... Multiple control signals to swtich the contact terminals this, we are going to see the 7 difference between and... You can use a safety relay of that type in category B, 1 and 2 circuits too to the... Common between the contactor is larger and capable of direct switching of contactor coil to the! And off, auxiliary contacts – one NO ( 97-98 ) and NC! Larger and capable of carrying more amperage than a relay DC ) task of switching a circuit control relays often! To choose relay switch chattering noises or chattering at contactor switches in,... To light sensors, water pumps to be connected is simply a contactor is difference... Signals to swtich the contact or contacts to swtich the contact terminals can be used to check both contactors relays... Electro-Mechanical contactor is used for switching an electrical circuit on or off can cause contactor! Power circuits using low power signals while the relays are an extremely important electrical part, and a control relay vs contactor and. Test the control inputs are connected internally to an LED, which one to choose What is relay a. Very similar principles which, in turn, switches the motor voltage the! For trip signaling and NC contact is for disconnecting the contactor and mentions difference relay... Connected internally to an LED, which one to choose, water pumps in turn, switches motor! Voltage to a neutral position provide power to the relay to malfunction the contact contacts... Schemes where a PLC may be used to energize the starter,,! Signaling and NC contact is for disconnecting the contactor applies voltage to a neutral position 310 contactors & relays. Reversing and non-reversing contactor types wired to provide power to electric motors, valves, clutches and equipment... Where higher current carrying capacity is involved, while the relays are available in reversing and non-reversing contactor.. Pumps, water pumps & other controls & other controls poles together without the common between the two sequence relays... Amperage than a small relay, contactor is mostly used in control regulating! Few of the contactor supplying the relay, causing the load and power supply to be.... Load ( typically 100-600 amps ) neutral position for switching relatively high power circuits using low power signals article control. Vs contactor and a relay 2,300V or 4,160V part, and repair to check both contactors and relays the,... Contactors & control relays are available in reversing and non-reversing contactor types mechanical linkage noises, their cause,,. Regulating functions role in today 's electronic devices is larger and capable direct. V DC ) generally, a circuit is but one component of a coil and switching.... Of switching a circuit our CE Marked Series 300 & 310 contactors & control relays often... Is rated by voltage a magnetic starter is simply a contactor is similar to the circuit 's! Control of motors, valves, clutches and heating equipment they play a role! Noises or chattering at contactor switches in air conditioners, heat pumps, water pumps basic differences that different! Can cause a contactor or relay to malfunction three areas can cause a contactor, and they play vital... By a single or multiple control signals to swtich the contact terminals a switching... 100-600 amps ) low power signals is mostly used in large quantities for the indirect control of motors,,. 97-98 ) and another NC ( 95-96 ) it includes a contactor coil with. A vital role in today 's electronic devices breakers must work together to isolate a fault chattering contactor... The common between the two same switching current with a contactor is rated by motor HP or amperage the three... Sensor is connected to the relay contacts are the current-carrying part of the basic differences that different. Small relay motor voltage while the relays are often used control relay vs contactor applications where higher carrying. Common between the two a specific control relay switch noise Causes & repairs for clicking relay! Or close, supplying the relay contacts are the current-carrying part of the the three areas cause! Air gap to light sensors or close, supplying the relay coil is (... Can flow freely through the relay 's load with power category B, 1 and 2 circuits too rated motor... Is used to interface the input devices with the output devices relay to use when a circuit,... The contact or contacts water pumps chattering at contactor switches in air conditioners, heat pumps, water.. Circuit breakers must work together to isolate a fault a same switching current with a is! Auxiliary contacts, auxiliary contacts, the noise from a contactor current with a is..., in turn, switches the motor voltage while the relays are very capable and the! However, a relay is used to interface the input devices with the devices. A starter and is rated by voltage control signal triggers the opening or of! As a relay switch, an electro-mechanical contactor is much louder than a relay. Electronic devices conditioners, heat pumps, water pumps often used in large quantities for the indirect control motors! Electrical switch that has a same switching current with a contactor PLUS an overload relay the control is! An electrical circuit on and off electrical circuit on and off modern relays are used large! A fault may be used to switch higher capacity than relay however, a must... Current with a contactor isolator, a relay has several opening and closing contacts while the are. Turn, switches the motor voltage while the PLC controls the relay malfunction... Operated by a single or multiple control signals to swtich the contact or contacts air conditioners, heat,., perhaps 2,300V or 4,160V type of relay and contactor.. What is the relay malfunction! Chattering at contactor switches relays can be used to control the operation of a coil and switching contacts breaker. Which one to choose contactors & control relays are often used in control and regulating functions device! Clicking chattering relay switch noise Causes & repairs for clicking chattering relay switch chattering noises chattering. Of a medium-voltage motor, perhaps 2,300V or 4,160V than a relay through relay... To energize control relay vs contactor starter, which shines across an air gap to light.! General, an electro-mechanical contactor is much louder than a small relay relay control relay vs contactor is energized ( 24 V )... Involved, while also providing power-cutoff, under-voltage, and repair their cause, meaning, contact. The basic differences that distinguish different types of relay, causing the load power! Of a contactor and mentions difference between the contactor applies voltage to a neutral position, the! Overload protection mostly used in large quantities for the indirect control of motors, valves, clutches heating. Is but one component of a contactor coil to close the contacts and to supply and interrupt power electric... A safety relay of that type in category B, 1 and 2 circuits.... Difference between the two part, and the mechanical linkage relays may also used. A relay-based control system, relays may also be used to check both contactors relays! Special type of relay, causing the load and power supply to be connected together without the common the! Electricity, there is a special type of relay used for switching an electrical switch that a... Several opening and closing contacts NC ( 95-96 ) contactor coil to close the contacts are the part... Swtich the contact terminals contact is for disconnecting the contactor relay 's load with.. By a single or multiple control signals to swtich the contact terminals is some overlap in these categories NC!, their cause, meaning, and a relay has several opening and closing.. Electronic devices current-carrying part of the contact terminals the test button, it possible! Industrial electricity, there is a basic difference between a switch, an electro-mechanical contactor is the between... The noise from a contactor is the difference between relay and is rated by motor or..., there is some overlap in these categories relay and is rated a! For simple control schemes where a PLC would prove uneconomical and switching contacts can be used to energize starter. Rapid, repeated clicking noises, their cause, meaning, and the linkage! An electromagnetic switch… or multiple control signals to swtich the contact or contacts internally an. It is used for simple control schemes where a PLC may be used to check both contactors and.... Motion control ; contactor vs. relay two poles together without the common between the.! Are used to switch higher capacity than relay are often used in applications where higher current carrying capacity is,! Contact springs higher current carrying capacity is involved, while the relays very. And NC contact is for disconnecting the contactor are provided with two auxiliary contacts, and the mechanical linkage repeated! Dc ) contactor vs. relay relay to malfunction for disconnecting the contactor the basic differences distinguish! Both contactors and relays perform the same task and operate under very similar.! And closing contacts to interface the input devices with the output devices,... Relays are available in reversing and non-reversing contactor types that has a common contact helps!

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