Tri-county tech firms have announced strong first-quarter results, largely fueled by impressive growth at Camarillo’s Power-One.

Here’s a closer look at first-quarter earnings at some of the largest firms in the region:

• Power-One, a maker of power treatment products for everything from computers to trains to solar panels, turned in a $3.8 million profit for the first quarter, compared with a $61 million loss in the first quarter of last year. The swing from red to black stemmed from a 556 percent increase in sales for the company’s products for solar panels and wind turbines, a business line it acquired a few years ago as its traditional segments stagnated.

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