STS300: STS 100 – 800 A 3 phase
3-phase STS 100-800 A
Three-phase and single-phase static transfer switches for seamless load transfer in dual path power systems.
- Rugged design and high reliability
- Solutions up to 3000 A
- Other ratings under request
- Optimised system configuration for ICT applications
- Customization for harsh environment and specific applications
Benefits:
- Total control over load transfer: continuous source monitoring and robust management logic guarantee disturbance free power transfers to downstream critical loads
- High overload capability: industrial derivation design providing high overload capability and high fault current management
- Enhanced safety: redundant control logic and embedded backfeed protection for complete system and operator safety
- Minimum maintenance costs: full front accessibility to all components and high material quality extremely reduce servicing
Features:
- Continuous monitoring of voltage and frequency and automatic instant transfers for secure power switching without cross connection between sources
- SCR fault detection and backfeed protection for maximum upstream safety
- Dual manual bypass for complete source independence during maintenance
- True oversized neutral (2x In), redundant cooling with monitored fans and redundant (3×3) internal power supply in all system control boards for top product reliability in high availability applications
- Short circuit transfer inhibit for robust load protection
- Full front access for easy maintenance
- Bottom and top cable entry for maximum installation versatility
- Comprehensive set of communication options for total remote monitoring of equipment operation
- Fully compliance with all international product standards for maximum quality guarantee
STS300 technical data
| Rating (A) | 100 | 250 | 400 | 630 | 800 |
| Dimensions WxHxD (mm) | 820x1475x835 | 1220x1900x860 | |||
| Weight (kg) | 265 | 290 | 305 | 615 | 660 |
Input
| Connection type | Hardwired 2w |
| Nominal voltage | 208/380/400/415/440/480 Vac 3-phase with neutral |
| Voltage tolerance | ±10% (up to ±20% on request) |
| Frequency and range | 50/60 Hz, ±2 Hz (up to ±4 Hz on request) |
| Source harmonic voltage content |
unlimited (>20%THD transfer time ≤10ms) |
| Transfer phase angle | 5° ÷ 30° |
Output
| Connection type | Hardwired 2w |
| Nominal voltage | 208/380/400/415/440/480 Vac 3-phase with neutral |
| Frequency | 50/60 Hz |
| Transfer time | ≤4 ms |
| Transfer mode | Break before make, transfer inhibit on fault |
| Load power factor | 1 to 0.3 |
| Maximum crest factor | 3:1 |
| THD current fedback from load | unlimited |
| Overload capacity | 125% for 30 min, 150% for 10 min, 200% for 30 s, 2000% for 1 cycle, 4000% for ½ cycle |
| Efficiency (AC/AC) | >99% |
Connectivity and function extensions
| Front panel | Graphical LCD display, mimic LED panel and keyboard |
| Remote communication | SPDT contact relay board; RS232 and RS485 serial ports, ModBus-RTU protocol; optional: additional SPDT contact relay board |
| Optional function extension | 4-poles configuration; plug-in circuit breakers; operation without neutral; panel builder execution; output distribution panels; isolation transformer |
System
| Protection degree | IP 20 (other options) |
| Colour | RAL 7035 (other options) |
| Installation layout | Wall, back to back and side by side installation allowed |
| Accessibility | Front access, bottom and top cable entry |
Other features
Environmental
| Operating temperature range | 0 °C ÷ +40 °C |
| Storage temperature range | -10 °C ÷ +70 °C |
| Altitude | <1000 m |
| Audible noise at 1m (dBA) | <62 |
Standards and certifications
| Quality assurance, environment, health and safety | ISO 9001:2008, ISO 14001:2004, GOST, BS OHSAS 18001:2007 |
| Safety | IEC EN 62040-1 |
| EMC | IEC EN 62040-2 |
| Breakers | IEC EN 60947-3 |
| Transfer voltage limits | IEC EN 62040-3 IEEE Standard 446 |
| Protection degree | IEC 60529 |
| Marking | CE |
