Two of the main types of AC brakes are solenoid brakes and thruster brakes. Spring set and electrically released AC shoe brakes are set when power is removed or safety. Solenoid brakes operate using 115 VAC thru 575 VAC single phase coils. Brake wheel diameters ranging from 4-1/2″ to 10″. They are reliable and provide extended, trouble free service. Thruster brakes are used to retard the speed of moving machinery and to stop it accurately to the desired position. The braking force is applied to the brake shoes by a per-stressed comprising spring. The shoes press on the rotating brake drum retarding its speed and finally stop it. The releasing of the brake drum and compressing of the spring is done by thruster.