Automatic Transfer Switch (ATS) 102: Withstand Ratings and Selective Coordination Implications

Course Description: Automatic transfer switches are often required to withstand a fault and connect the load to an emergency generator source afterwards. Due to selective coordination, some switches may be subject to a fault current for an extended period. In this course we will dive into the basics of both and explore how we can optimize the design for safety, economy, and performance. The course is free of charge.
Objectives: After this course, you will be able to:
1. Explain ATS contactor (Braun) vs. controller (Brain) functions.
2. Explain how contact design/ material impacts Withstand and Close-on Ratings (WCR).
3. Explain how time delays impact NFPA 110 Level 1, 10 second start requirement.
4. Explain the difference between Withstand and Close-on Ratings (WCR) and Ampere Interrupting Capacity (AIC) per UL1008.
5. Explain how UL circuit breaker classification affects selective coordination, impacting transfer switch selection (Time-based vs. 30 cycle).

Learning Method: Interactive Live or Live Webinar Lecture

Delivery Method: Live

Internal Course Code: ATS102

Duration: 1h

HSW Compatible: No

Point of Contact Name: Customer Service

Point of Contact Email: karla.wood@kohler.com