double-throw switch[¦dəb·əl ‚thrō ′swich]
A switch that connects one set of two or more terminals to either of two other similar sets of terminals.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
In electric wiring, a switch which can charge the circuit connections by moving the switch blade from one of two sets of contact clips into the other.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.