Question 135Electricity & Electronics - 1st Asst/Chief

The correct answer is D) double-pole, double-throw switch. The change-over switch shown in the illustration EL-0058 is a double-pole, double-throw (DPDT) switch. This type of switch has two poles (circuits) and can connect each pole to either of two separate throws (positions). This allows the switch to select between two different circuits or power sources. The other options are incorrect because a single-pole, single-throw switch has only one circuit and one position, a double-pole, single-throw switch has two circuits but only one position, and a single-pole, double-throw switch has one circuit that can connect to either of two positions.