High-Efficiency Brush HoldersMassive reaction-type brush holders assure constant tension over the life of the brush with the use of a negator-type spring. The holders also include quick disconnect shunts and a brush wear indicator. The brushes used in these holders are multi-wafered and feature special vibration damping pads to provide optimum commutation even under the most severe operating conditions. Radial brush holders with the same features are used on reversing motors.