Universal coupling relays with user friendly connection and wide range input

2018-06-07

Sirius 3RQ2: New series of coupling relays for universal application reduces model diversity with wide-range input from 24 to 240 volt AC/DC
High-grade industrial enclosure with user-friendly connection simplifies handling, installation, servicing and wiring
Typical applications include galvanic isolation, signal amplification and voltage conversion as well as overvoltage and EMC protection

Sirius 3RQ2 from Siemens is a new range of coupling relays with truly universal application scope. With their minimal mounting depth of 90 millimeters and wide-range power supply from 24 to 240 volts AC/DC, these relays are available in variants with between one and three changeover contacts. The Sirius 3RQ2 coupling relays are replacing the 3RS18 series, but with a drastically reduced number of variants due to the availability of a wide-range input. Use of the same terminal assignment and minimization of the variant options makes changeover to the new Sirius 3RQ2 coupling relay series both fast and simple to implement. The new relays are also designed for optimum coordination with Simatic S7 controllers and Sirius contactors. Typical applications include galvanic isolation, signal amplification and voltage conversion, for instance from 24 V DC to 230 V AC, as well as overvoltage and EMC protection for control systems. The Sirius 3RQ2 variants with hard gold-plated contacts for switching currents in the lower milliampere ranges are particularly suited for PLC inputs and outputs.

Sirius 3RQ2 from Siemens is a new range of coupling relays with truly universal application scope. With their minimal mounting depth of 90 millimeters and wide-range power supply from 24 to 240 volts AC/DC, these relays are available in variants with between one and three changeover contacts.

With its new, high-grade industrial-duty enclosure in titanium gray design, the new Sirius 3RQ2 coupling relay series blends in visually with the rest of the Sirius relay family. The user-friendly connection methods available offer a range of benefits such as simpler handling, installation, servicing and wiring. Connection is made particularly convenient by the large terminal cross-section of up to four square millimeters and permanent wiring with removable screw-type or spring-type (push-in) terminals. The terminal covers are labeled to simplify wiring assignment, and a DataMatrix code enables easy access to services and support. An extensive array of international standards and certifications such as CE, UL/CSA and EAC makes the new coupling relay ideal for wide-ranging uses including railway applications.

Background information

When standard controllers with standard inputs and outputs reach the limits of their capacity, coupling relays come into their own. They are used for the galvanic isolation of I/Os and PLC inputs and outputs, to amplify and reproduce signals or convert them to different voltage levels and signal forms. Coupling relays and interface converters for different requirements and applications are part of the extensive Sirius industrial controls portfolio from Siemens.

Siemens AG (Berlin and Munich) is a global technology powerhouse that has stood for engineering excellence, innovation, quality, reliability and internationality for 170 years. The company is active around the globe, focusing on the areas of electrification, automation and digitalization. One of the world's largest producers of energy-efficient, resource-saving technologies, Siemens is a leading supplier of efficient power generation and power transmission solutions and a pioneer in infrastructure solutions as well as automation, drive and software solutions for industry. With its publicly listed subsidiary Siemens Healthineers AG, the company is also a leading provider of medical imaging equipment – such as computed tomography and magnetic resonance imaging systems – and a leader in laboratory diagnostics as well as clinical IT. In fiscal 2017, which ended on September 30, 2017, Siemens generated revenue of €83.0 billion and net income of €6.2 billion. At the end of September 2017, the company had around 377,000 employees worldwide.