Since these brakes are in normally closed position, the release of the Brake shoes is affected by energizing the electro magnetic coil, which overcomes the spring force and the shoes are moved clear off the drum by lever/arm linkage system so that the drum is free to rotate without any friction. When the power in given to the Electro Magnetic coil the coil gets energized and in turn pulls the plunger down.  The plunger in turn operates the arm of the brakes and the brake opens. The design of the brake is such that as the lining keeps wearing out due to normal operation of the brake, adjusts itself on its own to achieve the rated toque. When specified, brake drum or drum coupling both pin bush type and flexible geared type can be supplied along with the brakes. 

Since these brakes are in normally closed position, the release of the Brake shoes is affected by energizing the electro magnetic coil, which overcomes the spring force and the shoes are moved clear off the drum by lever/arm linkage system so that the drum is free to rotate without any friction. When the power in given to the Electro Magnetic coil the coil gets energized and in turn pulls the plunger down.  The plunger in turn operates the arm of the brakes and the brake opens. The design of the brake is such that as the lining keeps wearing out due to normal operation of the brake, adjusts itself on its own to achieve the rated toque. When specified, brake drum or drum coupling both pin bush type and flexible geared type can be supplied along with the brakes.