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Come to discover the whole range of ONIS VISA generating sets and accessories. If you still can’t find what you are looking for, you can count on our Research & Development team, consisting of 15 engineers able to evaluate any kind of request and submit the most suitable solutions to your specific needs, always granting safety and reliability for long-lasting projects.



With star the start of each of the three phases is connected together. Connections are taken from the ends of the three phases to give the three phases
Star symbol voltage


With Delta the starts and ends of the phases are connected. The end of phase 1 is connected to the start of phase 2, the end of phase 2 to the start of phase 3, and the end of phase 3 to the start of phase 1. Connections are taken from the three start-end points to give the three phases.
Delta symbol voltage
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