What distinguishes a SPDT center off switch from a regular SPDT switch?

The distinguishing feature of a SPDT (Single Pole Double Throw) center off switch is the presence of an additional "off" mid-position in the handle. This means that the switch can be in one of three positions: the first position connects the load to one terminal, the second position connects it to another terminal, and the third, middle position completely disconnects the load from both terminals. This center off feature allows for more flexibility in applications where it’s necessary to completely turn off the device in addition to selecting between two operational modes.

In contrast, a regular SPDT switch does not include this mid-position; it typically only has two functional positions that connect to either of the two terminals. The other options related to voltage handling or neutral connections do not define the essential characteristic of the center off functionality that sets this type of switch apart from a regular SPDT.