Relay couplers are also known as relay isolators or relay interfaces or even safety relays and their main purpose is to protect control circuits, especially when the load is inductive. Learn what they are and how they work! The main application of these safety relays is to protect control circuits from dangerous noise induced by the load in operation. They are not exactly an optical coupling, but they ensure good insulation. They are widely used in industry, especially in the automation area for controlling loads, motors and various actuators. Couplers can be used as galvanic isolators or also to multiply contacts in which a command activates several different outputs. They can also be used in protection circuits when using microcontrollers, Arduinos, computer serial or USB ports and other control systems that work with low voltages and currents. The supply voltage of the command and the load can be different and preferably not derived from the same power source to ensure real isolation. For example: the control can be 12 or 24V and the load powered by 220V or 127V. There is no need for the voltages to be the same or to mix the source used in the control with the source required by the load. The price of these safety or coupling relays varies according to the brand, the current they support and mainly the estimated durability of the products, which is greatly influenced by the estimated number of activations for the relay contacts and also by the quality of the supporting components. These modules can generally be used to place on DIN rails, facilitating assembly and adapting to the industrial environment. Some common brands and models of coupler relays are: Metaltex, Web, Cabur, Siemens, Conexel, Finder, Murr, Sick, Pilz, Scheneider, Schmersal, Phoenix Contact, Wago, JNG, Eaton, Omron, Proauto, Slim, Pilz, Banner, Allen, Rockwell, Euchner, CSD, Ifm, Moeller, MSR, Keyence, Leuze, Yamaha ... among others. Electrical installations. In addition to this YouTube channel, you can follow Mundo da Elétrica on social media! Visit the Mundo da Elétrica website: http://www.mundodaeletrica.com.br Like the Facebook page: /mundodaeletrica Follow the Google Plus page: https://plus.google.com/+Mundodaeletr... Follow on Twitter: /mundodaeletrica