The professional range is equipped with a thermal disconnect device which disconnects the high capacity metal oxide varistor from the mains if they are over stressed due to frequent high energy surges or long over voltage conditions, if the thermal disconnect triggers, it will also automatically disconnect the power as a further precaution. The Professional 2000 has increased filtration and upgraded status indicators. These high performance line filters offer surge and transients suppression for sensitive electronic equipment from mains born noise and induced lightning. These units have extended filtering characteristics and are suitable for use in high noise environments.