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New vacuum circuit breakers for higher voltage levels

The picture shows the Sion 3AE5 vacuum circuit breaker.

Unlike gas-insulated switches, vacuum circuit breakers interrupt the arc in a vacuum interrupter. The hermetically-sealed vacuum interrupters are generally maintenance-free and independent of environmental influences. Because no oxidation occurs in a vacuum, the contacts remain perpetually clean and guarantee uniform switching behavior throughout the entire life cycle. As a result, like all vacuum circuit breakers of the Sion series, the new Sion 3AE5 is especially low-maintenance: up to 10,000 operating cycles are possible under normal ambient conditions between -5°C and 55°C without re-lubrication or readjustment. With servicing procedures, the unit can switch up to 30,000 times. The Sion 3AE5 vacuum circuit breakers are optionally available for fixed mounting or in draw-out technology. Different low voltage plugs or terminal strips facilitate installation. Due to the large selection of pole center distances and jaw widths, along with the comprehensive installation accessories, retrofitting is easy in existing switchboards.

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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 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. 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. Further information is available on the Internet at
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Heidi Fleissner

Siemens AG

Siemensstr. 10
93055 Regensburg

+49 (941) 790-2212