balance coil

balance coil

[′bal·əns ‚kȯil]
(electricity)
An iron-core solenoid with adjustable taps near the center; used to convert a two-wire circuit to a three-wire circuit, the taps furnishing a neutral terminal for the latter.
References in periodicals archive ?
For the Back Supporter Collection, the company beefed up its coil spring components and made improvements to the cushioning foam, packaging the changes under the new Total Balance Coil System.