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.
For further information on vacuum circuit breakers, please see www.siemens.com/sion
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