WASHINGTON — President Trump says his trade war with China will protect America’s dominance and derail Beijing’s plan for technological and economic supremacy.

But as the fight kicks into high gear this week, American tech and telecom companies are warning that the industry’s growing reliance on products made and assembled in China means they are more likely to be casualties, not victors, in the skirmish.

Mr. Trump’s next round of tariffs on $200 billion worth of Chinese goods goes into effect on Monday, hitting thousands of consumer products from handbags to refrigerators to bicycles. The tariffs will also hit the tech and telecom companies that provide much of the gear that powers the internet, mobile networks, data storage and other technology. United States customs will begin collecting a tax on circuit boards, semiconductors, cell tower radios, modems and other products made and assembled in China and exported into America.

Those tariffs, Intel warned in a letter last month, are “a game changer for the American consumer.” The tariffs begin at a rate of 10 percent and increase to 25 percent next January.