How a Data Center Cut Power Downtime by 95% with SWCPS Automatic Transfer Switch

Customer Background

A mid-sized colocation data center in the Midwest United States manages 50 racks serving financial services and healthcare clients. Their facility requires 99.999% uptime to meet SLA commitments. The existing power infrastructure relied on a legacy automatic transfer switch (ATS) from a generic manufacturer, which had been in operation for over eight years.

Challenges with Power Transfer Reliability

The legacy ATS exhibited slow transfer times averaging 150 milliseconds during utility-to-generator transitions. On three occasions in the past year, this delay caused momentary volt-level sags that triggered UPS overloads and resulted in brief server shutdowns. The facility manager also noted that the aging switch required monthly manual inspections due to contact wear, adding $2,500 annually in maintenance labor. With utility power fluctuations increasing due to grid instability, the risk of longer outages was rising.

Why the SWCPS Automatic Transfer Switch?

The engineering team assessed three alternatives: a competing brand with similar specs, a retrofit kit for the existing switch, and the SINGI SWCPS. The SWCPS stood out because it complies with IEC 60947-6-1:2021, ensuring robust short-circuit withstand and reliable operation. Its solid-state switching technology promised transfer times under 10 milliseconds, far exceeding the 100 ms requirement for sensitive IT loads. The built-in self-diagnostics and remote monitoring capability also eliminated the need for monthly manual checks.

Implementation Process

The project took three weeks from order to commissioning. Key steps included:

• Site survey to confirm electrical parameters and space constraints.
• Custom configuration of the SWCPS for the existing 480 V, 1600 A system.
• Installation during a planned maintenance window; the switch was mounted in the same footprint as the old unit.
• Integration with the building management system via Modbus for real-time status updates.

A typical challenge was synchronizing the SWCPS with the generator controller's start signal. The team resolved it by adjusting the volt-level sensing thresholds through the SWCPS's programming interface, which took two hours of on-site tuning.

Quantifiable Results

After six months of operation, the data center reported:

• Average transfer time reduced from 150 ms to 8 ms — a 95% improvement.
• Number of unplanned outages due to transfer failures dropped from 3 per year to 0.
• Maintenance costs decreased by $2,500 annually, as manual inspections were no longer needed.
• UPS stress events related to volt-level sags disappeared completely.

The facility now meets its 99.999% uptime target consistently, and client complaints related to power quality have ceased.

Client Testimonial

"The SWCPS eliminated our biggest single point of failure. We can trust the transfer switch to work without surprises, and the remote monitoring gives us peace of mind," said the facility's electrical engineering manager.

Lessons and Recommendations

For other data centers assessing ATS upgrades:

• Prioritize transfer time specifications that match your critical load tolerance — sub-10 ms is essential for modern servers.
• Choose a switch with built-in diagnostics to reduce manual maintenance and avoid unexpected failures.
• Ensure compliance with IEC 60947-6-1 to guarantee performance under fault conditions.
• If starting over, the team would allocate more time for integration testing with the generator controller during commissioning.

References:

• IEC 60947-6-1:2021, Low-volt-level switchgear and controlgear – Part 6-1: Transfer switching equipment.
• Setiawan, I. Et al., "Robust Automatic Transfer Switch System for Grid/Solar PV/Genset Sources," AIJASET, vol. 5, no. 2, 2021.