What Is Circuit Breaker Coordination?_
Circuit breaker coordination ensures that when a fault occurs, the breaker closest to the fault opens first, while breakers closer to the source remain closed to keep power on other loads. This is achieved by setting time-current curves so that downstream breakers trip faster or at lower currents than upstream ones. Proper coordination prevents unnecessary shutdowns and maintains uptime for critical GPU compute nodes.
Technical Details
Coordination relies on adjusting trip settings (e.g., long-time pickup, short-time delay, instantaneous) per OEM specifications, typically using a time-current curve overlay. In a GPU cluster, each rack PDU breaker must coordinate with the branch circuit breaker in the facility panel to avoid nuisance trips during GPU power surges. The process involves analyzing fault current levels and breaker response times, often with software tools, to ensure selectivity without exceeding equipment ratings. Field verification includes testing with a primary injection test set to confirm trip times match the coordination study.
How Leviathan Systems Works with Circuit Breaker Coordination
During Leviathan rack assembly and power-up, we verify coordination between the rack-level PDU breakers and the facility distribution panel breakers to prevent a single GPU node fault from dropping an entire row. This is checked against the site’s coordination study before commissioning.
Related service
GPU Rack Assembly & Rack-and-Stack →