control relay vs contactor

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

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