Zenith T-Series Automatic Transfer Switch Withstand and Closing Ratings

This document provides technical information on the withstand and closing ratings (WCR) of ABB Zenith T-series automatic transfer switches (ATS), detailing compliance with UL 1008 standards and NFPA 110 requirements. It explains testing procedures, rating categories (including current limiting fuse, specific breaker, and time-based ratings), and the importance of coordinating transfer switch ratings with protective devices to ensure system safety and reliability.