How many connection points does a 2-pole double throw knife switch have?

A 2-pole double throw knife switch is designed to allow for the control of two separate circuits through two positions, giving it a specific configuration of connection points. Each pole in the switch is connected to two terminals for the two circuit positions it can control.

In a standard 2-pole double throw switch, there are typically two input terminals, one for each pole when connected to a source, and two output terminals for each pole when connected to a load. This results in a total of four connection points: two for each pole that can either be connected to the source or load depending on the switch's position.

When counting the total number of connections when fully utilized, you also consider the points at which the switch can be manipulated to engage or disengage each of these connections across both poles. This leads to a configuration that presents as six connection points being used effectively, including the configurations for both on (connected) and off (disconnected) states across the two poles.

Thus, the correct answer reflects the overall operational capacity of the switch, highlighting its functionality in controlling multiple circuit connections efficiently.