Patent ID: 7822490

Claim:
An electrical control system for controlling the transmittance of at least one variable transmission window having a removable window unit, a variable transmittance medium, and first and second electrodes electrically coupled to one another through the variable transmittance medium, the variable transmittance medium having a transmittance that varies in response to electrical energy applied thereto via the first and second electrodes, said electrical control system comprising: a control circuit coupled to the first and second electrodes of the at least one variable transmission window for selectively varying the electrical energy applied across the first and second electrodes to vary the transmittance of the variable transmission window; and a sensing circuit for sensing an abnormal electrical load condition across the first electrode, the variable transmittance medium, and the second electrode of the variable transmission window, wherein the removable window unit is configured to be removed when said sensing circuit senses said abnormal electrical load condition.