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SIRIUS 3UG546: Multi-functional load monitoring relay for DC applications

SIRIUS 3UG546 DC load monitoring relay is simply ideal for monitoring industrial applications, and especially battery-based applications. In single- or dual-channel mode, the devices monitor the direct current (DC load circuit), the voltage level and the actual power, and issue a warning if one of these values is above or below the limits defined.
The SIRIUS 3UG546 DC load monitoring relay features a large operating voltage range from 0 to 800 V. The following two current variants are available: 22.5 mm overall width: 2x8 A / 1x16 A; 45 mm overall width: up to 63 A.
The SIRIUS 3UG546 DC load monitoring relay comes with separate counters for energy consumption and energy recovery. Operating hour and switching cycle counters enable preventive maintenance. The switching cycle counter is incremented by one with every detected switch-off of the monitored load, and the operating hour counter indicates the time period during which a measurable current exists. The number of switching cycles and operating hours serves as an indicator as to whether maintenance or the replacement of switching elements, machine parts and plant sections is required.
The devices can be integrated into the TIA Portal and all the relevant parameters can be parametrized via Profinet. Measured and counter values as well as diagnostic messages are transmitted to a controller via Profinet. To enable fast responses to faults detected in the plant, the internal relay serves as a signal output and trips as soon as a value exceeds or falls below a defined limit. In addition, all the counter and measured values monitored can be provided with a warning limit which generates a warning via Profinet whenever a limit violation occurs. However, operation – including fault response – is also possible without Profinet.
The SIRIUS 3UG546 DC load monitoring relay offers high user friendliness and simplified use. No expert knowledge is required for commissioning or data processing.
The SIRIUS 3UG546 DC load monitoring relay is ideal for use in various industries, including: automotive (DC current monitoring in automotive production facilities), robotics (monitoring and energy recovery for robot-integrated processes), e-Mobility (monitoring the energy supplied, deep discharging protection for EV charging), DC energy storage, control cabinet manufacture (DC current monitoring in the control cabinet or in the manufacturing/process units), lighting, and also in autonomously guided vehicles which automatically approach charging stations to charge their batteries.
For further information on Siemens Smart Infrastructure, please see 
For further information on Siemens Digital Industries, please see
For further information on SIRIUS Monitor, please see
Siemens Smart Infrastructure (SI) is shaping the market for intelligent, adaptive infrastructure for today and the future. It addresses the pressing challenges of urbanization and climate change by connecting energy systems, buildings and industries. SI provides customers with a comprehensive end-to-end portfolio from a single source – with products, systems, solutions and services from the point of power generation all the way to consumption. With an increasingly digitalized ecosystem, it helps customers thrive and communities progress while contributing toward protecting the planet. SI creates environments that care. Siemens Smart Infrastructure has its global headquarters in Zug, Switzerland, and has around 71,000 employees worldwide.
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Siemens AG (Berlin and Munich) is a global technology powerhouse that has stood for engineering excellence, innovation, quality, reliability and internationality for more than 170 years. The company is active around the globe, focusing on the areas of electrification, automation and digitalization. One of the 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 2018, which ended on September 30, 2018, Siemens generated revenue of €83.0 billion and net income of €6.1 billion. At the end of September 2018, the company had around 379,000 employees worldwide. Further information is available on the Internet at .
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Christian Stuart Wilson

Siemens AG

Smart Infrastructure
Werner-von-Siemens-Straße 1                       
80333 Munich

+49 (89) 636-22642