Designed with a modular, redundant architecture, our static transfer switches ensure fast, reliable automatic transfer between multiple power sources, delivering continuous power availability for critical loads.
| Product model | Neptune-D375-SA1 | Neptune-D500-SA1 | Neptune-D750-SA1 | Neptune-D1000-SA1 |
| Technical Specification | ||||
| Electrical Parameters | ||||
| Rated AC voltage | 400V | 400V | 400V | 400V |
| Rated AC current | 546A | 728A | 1092A | 1456A |
| Rated AC Frequency | 50/60Hz | 50/60Hz | 50/60Hz | 50/60Hz |
| Rated Apparent Power | 375kVA | 500kVA | 750kVA | 1000kVA |
| Max. Load output Apparent Power | 375kVA | 500kVA | 750kVA | 1000kVA |
| Max.load output current | 546A | 728A | 1092A | 1456A |
| Max. PCS Apparent Power | 375kVA | 500kVA | 750kVA | 1000kVA |
| Max. PCS current | 546A | 728A | 1092A | 1456A |
| Max.DG Apparent Power | 375kVA | 500kVA | 750kVA | 1000kVA |
| Max. DG current | 546A | 728A | 1092A | 1456A |
| System Data | ||||
| Build-in STS | Yes | |||
| Build-in ATS | Yes | |||
| IP level | IP54 | |||
| Transfer between on/off grid with STS | <10ms | |||
| Cooling method | ntelligent air cooling | |||
| Operating Temperature Range | -25~60℃（45~60℃ derating, derating factor 5%/℃） | |||
| Storage Temperature Range | -25~70℃（no condensation） | |||
| Relative Humidity | 0~95%（no condensation） | |||
| Noise | <75dB(A) @1m | |||
| Maximum Operating Altitude (m) | 4000m（derating above 3000m,derating factor 1%/100m） | |||
| AC Lightning protection | Type II | |||
| Communication | RS485 | |||
| Dimensions(W*D*H) | 950*900*2100mm | 950*900*2100mm | 800*1000*2060mm | 800*1000*2060mm |
| Weight | 550kg | 580kg | 475kg | 525kg |
| Certificate | ||||
| IEC 61439-1、IEC 61439-2 | ||||
| Expand models | ||||
| Not equipped with ATS | / | Neptune-D500-S1 | / | Neptune-D1000-S1 |
| Not equipped with STS | Neptune-D375-A1 | Neptune-D500-A1 | Neptune-D750-A1 | Neptune-D1000-A1 |
| Not equipped with ATS&STS | / | Neptune-D500 | / | Neptune-D1000 |
A Static Transfer Switch (STS) is a high-speed power device that automatically switches critical loads between primary and backup power sources without interruption. Using advanced switching technology and precise timing, it maintains continuous operation even during voltage fluctuations or phase imbalances.
Keep your critical systems online with static transfer switches that deliver fast, reliable power switching. Our STS cabinets protect sensitive equipment from outages and voltage fluctuations, while allowing maintenance without downtime. As trusted static transfer switch manufacturers, we provide redundancy and seamless power reliability for mission-critical environments.
Static changeover switches are essential wherever uninterrupted power is critical. Common applications include:
With our STS cabinets, mission-critical environments benefit from rapid, seamless power transitions, providing trusted redundancy and consistent energy delivery.
Our static transfer switches feature built-in fast-switching modules with off-grid transfer <10 ms, ensuring critical loads remain online without interruption.
Serving 50+ countries worldwide, we bring extensive experience in commercial and industrial applications.
We provide tailored consultation, installation guidance, and full pre-sales, sales, and after-sales support. In 2026, we plan to establish technical service centers in South Africa and Europe to ensure rapid response and long-term assistance.
Whether you are a system integrator, project owner, or distributor, we are ready to assist you. Contact us today to secure uninterrupted power for your mission-critical systems.
