Product Highlight: FTR-L1 series
Latching Relay Series for AI Server Power Supply Units
It takes careful engineering to ensure the servers that process advanced AI algorithms and applications have proper power management to do the job. Getting it right is critical, because demand for power-hungry AI servers is skyrocketing.
To serve that market, FCL Components has developed a new line, the FTR-L1 and FTR-L1R, a small-body, high-current relay series designed for AI server Power Supply Units (PSUs) with built-in Automatic Transfer Switches (ATS).
The FTR-L1 (25A, 277VAC) and the FTR-L1R (40A, 277VAC) are 2-coil latching relays, so there is no need to waste power on coil consumption. A 1a+1b contact configuration makes the series suitable for switching the AC power source, and the relays offer a high dielectric strength of 2,500VAC between open contacts.
The FTR-L1 series features a wide 4.5mm contact gap, making it capable of supporting operation in environments at altitudes up to 5000m. The series is in compliance with product safety standard IEC 62368-1:2023.
Key Features of the FTR-L1 Series:
Compact, high-current designs:
- FTR-L1: 25A, 277VAC
- FTR-L1R: 40A, 277VAC
2-coil latching functionality:
- Maintains state without continuous power, reducing energy consumption.
1a+1b contact configuration
- Suitable for switching AC power supply units.
- Wide contact gap (4.5 mm) with 2,500VAC dielectric strength between open contacts.
The L1 Series is designed in accordance with IEC 62368-1:2023 safety standards and built to operate in extreme environments—at altitudes up to 5000 meters.
The Role of Relays in AI Systems
In AI systems, the PSU plays a critical role in delivering stable and sufficient power to high-performance components like Graphics Processing Units (GPUs) and AI accelerators. These components require much more power than in regular computers, so AI servers often use high-wattage, redundant PSUs to ensure reliability and avoid downtime.
In PSUs, the FTR-L1 relay series’ role is to automatically transfer to a secondary AC power source in an emergency. An ATS is an essential feature for customers requiring high availability and continuous performance.
Design for Purpose
The series features a slim, low-profile design measuring 50 × 20 × 27mm, making it suitable for the compact, space-saving installation requirements of PSU enclosures in compliance with the Open Rack V3 (ORv3) specification. The FTR-L1 supports the AC input current requirements of 3 kW-class ORv3 PSUs, while the FTR-L1R is designed for 5.5 kW-class ORv3 High Power Rack (HPR) PSUs.
The FTR-L1 series has already attracted interest from multiple power supply manufacturers, and orders for mass-production units are currently being accepted. FCL Components is also developing higher-capacity models for next-generation ORv3 HPR2 PSUs.
Specifications
| Series | FTR-L1 | FTR-L1R |
| Contact configuration | 1a+1b | |
| Max. carrying current | 25A | 40A |
| Contact rating | 25A, 277VAC | 40A, 277VAC |
| Rated coil voltage | 12V, 24V | |
| Coil rated power | 2,400mW | |
| Operating temperature | -40degC to +85degC | |
| Dielectric strength | Open contacts: 2,500VAC, 1 min. Adjacent contacts: 4,000VAC, 1 min. Between coil and contacts: 5,000VAC, 1 min. |
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| Dimensions / Weight | 50 x 20 x 27mm / approx. 45g | |