MASON toggle switches, available from Aerospace and Defence Products, incorporate snap-feel, quick-make, quick-break, contact wipe, and true positive action.
Spring mechanisms within the toggle switch cause the operating force to be highest near the center of travel and drop off rapidly thereafter, producing a satisfying snap feel when operated.
This snap feel, combined with the natural motion of the finger operating the switch, results in a quick-make, quick-break action. Also, having the electrical contact, as well as the operating knob, attached to the actuator assures that they move as a single unit.
The result being that the position of the knob indicates the position of the switch and whenever the knob is moved, the contact must also move. So, once the knob is moved away from a closed position, that circuit will definitely be opened: a true positive action.
This is not the case, for instance, with limit switches, where the actuator and contacts are independent and the circuit could remain closed even though the actuator operates. After operation, the mated contacts travel on different paths so that they move across each other, rather than together, resulting in a brisk wiping action that cleans the contacting surfaces.
These features, so necessary for high current switching, turn out to also be desirable for low current switching. Variations of MASON toggle switches using different contact materials are capable of switching low and very low currents.