SynQor® Releases an Advanced Military-Field Grade 3-Phase 440 Vrms Input UPS (UPS-1500-X-1U-4)

January 23, 2024

Boxborough, MA – January 23, 2024 – SynQor, Inc., announces its new 3-phase 440 Vrms balanced input military field grade UPS. The latest addition to SynQor’s lineup of Uninterruptible Power Supplies addresses the unique challenge of connecting single phase loads to 3-phase power systems on aircraft and ships. The UPS-1500-x-1U-4 balances phase currents within the strict requirements dictated by MIL-STD-1399-300B, which stipulates phases to be balanced within ±5% for ships and ±3% for submarines. This power supply simplifies achieving a high degree of phase current balance with today’s single-phase electronic critical loads, streamlining system integration and shortening design cycles. A single phase load with poor power factor, high current distortion, or high reactance will appear as a resistive 3-phase load compliant with MIL-STD-1399-300B 440 type I.

The UPS-1500-x-1U-4 can be configured for a diverse range of power applications and offers advanced options including a selection of output voltages (115 or 230 Vrms), frequencies (50, 60, or 400 Hz), and an electronic breaker on the AC output that permits glitch-free, fault-tolerant parallel operation of up to 32 units in Single-Phase, Split-Phase, or 3-phase N+M redundant configurations. Additionally, the UPS has an optional floating neutral wire feature ideal for MIL-STD-1399-300 type I compliant applications. The unit can be configured with two optional ports: DC1 and DC2. The DC1 port can deliver several different voltages from 12 to 50 Vdc at 500 W. The DC2 port, in the absence of the DC input option, is able to deliver up to 1250 W of regulated or semi-regulated 24, 28, or 50 Vdc. A droop load option is also available which allows load sharing through the DC2 port. In addition, the UPS includes an Ethernet-SNMP module that allows real-time remote system monitoring with trap/email features that warn users and monitor consoles of important system events.

Featuring a ruggedized, compact, ultra-light, and fully isolated design, the UPS-1500-x-1U-4 is engineered to withstand the extreme electrical, shock/vibration, and environmental conditions of military and maritime applications. The backup power of the system is provided by an advanced, highly efficient, low-weight, compact, sealed lithium ion battery pack, which boasts a marked advantage in performance over similar market solutions. The UPS-1500-x-1U-4, as well as SynQor’s other UPS systems, outperforms other products in its class in output power, efficiency, reliability, flexibility, weight, and size.


  • Complies with 3-Phase 440 Type I, II, and III sources MIL-STD-1399-300
  • Balanced Currents less than 3%
  • AC input: 360-528 Vac; 47-800 Hz
  • Output Power: 1250 W / 1500 VA at 115 or 230 Vrms at 50, 60 or 400 Hz
  • Built-in Load Sharing and Redundant (N+M) capabilities
  • >10 min., >13.5 min., or >16 min. battery run-time at full power
  • 1U High Rack-Mount unit (17" x 22.64" x 1.73")
  • Low Weight: 33 lbs.

Specification Compliance:

  • MIL-STD-1399-300B
  • MIL-STD-810G
  • MIL-STD-461F
  • MIL-STD-704F
  • MIL-STD-1275D

SynQor’s field-proven, highly reliable technology shortens design cycles and helps designers/integrators yield reliable, dependable solutions for the very competitive military markets. Please click here to download the UPS-1500-X-1U-4 datasheet and here for the Operator’s Guide. For more information on this or for additional power application assistance, please explore more at or contact your local SynQor representative.