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The isolation transformers are advertised as having soft start, but it is not mentioned in any of the autotransformer documentation. Since both use a toroidal core, large startup inrush current might be expected for the autotransformer as well as the isolation transformer.
For AC usage, I just added soft start kids to my Rooftop AC units, but they didn't really need it.
Thanks for the response. My app. is not A/C, but conversion of 120VAC to 120/240 split-phase and load balancing. I need to understand if there is a reason why the Victron Autotransformers should not suffer from large inrush currents upon power-up due to an unadvertised soft-start feature or for some other reason. I note that the Victron isolation transformers have an advertised soft-start feature, but the autotransformers do not.
In other words, do I need to add an external soft-start circuit or not?
