A secondary phase inverter was a technological device capable of protecting the converter interface of a plasmadyne relay from failure due to excessive warp field stress.

In 2370, upon examining a plasmadyne relay aboard the USS Enterprise constructed by Geordi La Forge, Cadet Wesley Crusher sardonically mentioned that a secondary phase inverter would be required, despite La Forge's insistence that the relay could withstand over 500 cochranes of stress. (TNG: "Journey's End")

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