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STS 300

Centralized Static Transfer Switches
3-phase STS 100-2000 A

Three-phase static transfer switches for seamless load transfer in dual path power systems.

  • Rugged design and high reliability
  • Solutions up to 2000 A
  • Optimized system configuration for ICT applications
  • Customization for critical environment and specific applications
  • Total control over load transfer: continuous source monitoring and downstream inrush current management 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, fault detection 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.
  • Fuseless execution in 3-or 4-pole configuration for maximum flexibility.
  • Continuous monitoring of voltage and frequency and automatic instant (<4 ms) transfers for secure power switching without cross connection between sources.
  • Downstream inrush current management and short circuit transfer inhibit for robust load protection.
  • ITIC/CBEMA compliant asynchronous transfers.
  • Overlapping neutral management, for safe switching in 4-pole applications.
  • SCR fault detection and input moulded case switches with backfeed protection for maximum upstream safety.
  • Dual manual bypass for complete source independence during maintenance.
  • Dual redundant power supply, dual redundant control board and monitored fans for top product reliability in high availability applications.
  • Full front access for easy maintenance.
  • Configurable on demand for top, bottom cable entry or busbar entry for maximum installation versatility.
  • Comprehensive set of communication options.
  • Fully compliant with IEC product standards.

Applications

Tech Specs

STS 300: Centralized Static Transfer Switches 3-phase STS 100-2000 A

Rating (A)* 100** 250** 400 630 800 1000*** 1250 1600 1800 2000
Dimensions WxDxH (mm) 820x835x1475 811x980x2100 1211x980x2100 2011x980x2100 2311x980x2100 2511x980x2100
Weight (kg)** 265 290 305 615 660 700 820 1150 1280 1400

*rating up to 3000 A on request **some features may not be available ***available with top or bottom cable entry, dimensions 1211x980x2100 mm (WxDxH)

Input

Connection type Hardwired 3w or 4w
Nominal voltage 380/400/415 Vac 3-phase****
Voltage tolerance From ±1% to ±20%, adjustable (default ±10%)
Frequency and range 50/60 Hz, from ±1% to ±10%, adjustable (default ±5%)
Source harmonic voltage
content		 Unlimited
Transfer phase angle 5° to 30°

Output

Connection type Hardwired 3w or 4w
Nominal voltage 380/400/415 Vac 3-phase****
Frequency 50/60 Hz
Transfer time ≤4 ms
Transfer mode Break before make
Load power factor 1 to 0.3
Maximum crest factor 3:1
THD current fedback
from load		 Unlimited
Overload capacity 125% for 10 min, 150% for 1 min, 200% for 30 s, 1000% for 10 cycles, 2000% for 1 cycle
Efficiency (AC/AC) >99%

**** other on request

Connectivity and function extensions

Front panel Graphical LCD display, mimic LED panel and keyboard
Remote communication Included: dry contact relay card, RS232 and RS485 serial ports,
ModBus-RTU protocol.
Optional: additional dry contact relay card, SNMP, ModBus over TCP/IP card; dual ModBus card
Optional function extensions Thyristor protection fuses,
isolation transformer,
output distribution panels; other options on request

System

Protection degree IP 20 (other options)
Colour RAL 9005 (other options)
Installation layout Wall, back to back and side by side installation allowed
Accessibility** Top or bottom cable Top cable or busbar Top busbar

**other on request

Environmental

Operating temperature range 0°C to +40°C
Storage temperature range -10°C to +60°C
Altitude (AMSL) < 1000 m without power reduction, > 1000 m with reduction of 0.5% per 100 m
Audible noise at 1 m (dBA) <65

Standards and certifications

Quality assurance,
environment, health
and safety		 ISO 9001, ISO 14001, ISO 45001
Safety IEC/EN 62310-1
EMC IEC/EN 62310-2
Breakers IEC/EN 60947-3
Transfer voltage limits IEEE Standard 446
Protection degree IEC 60529
Performance IEC/EN 62310-3
Marking CE
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