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Centralized Static Transfer Switches 3-phase STS 100-3000 A

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

  • Rugged design and high reliability
  • Solutions up to 3000 A
  • Optimized system configuration for ICT applications
  • Customization for harsh environment and specific applications

Description

STS 300: Centralized Static Transfer Switches 3-phase STS 100-3000 A

Rating (A)* 100 250 400 630 800 1000 1250
Dimensions WxDxH (mm)** 820x835x1475 1220x860x1900 2000x1000x2100
Weight (kg)** 265 290 305 615 660 1000 1450

*rating up to 3000 A on request **3-pole version

Input

Connection type Hardwired 4w
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 (if THD>20% transfer time ≤10ms)
Transfer phase angle 5° to 30°

Output

Connection type Hardwired 4w
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 Included: dry contact relay card, RS232 and RS485 serial ports,
ModBus-RTU protocol.
Optional: additional dry contact relay card
Optional function extensions 4-pole 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 9005 (other options)
Installation layout Wall, back to back and side by side installation allowed
Accessibility Front access, bottom and top cable entry

Environmental

Operating temperature range 0°C to +40°C
Storage temperature range -10°C to +70°C
Altitude (AMSL) < 1000 m without power reduction, > 1000 m with reduction of 0.5% per 100 m
Audible noise at 1 m (dBA) <62

Standards and certifications

Quality assurance,
environment, health
and safety
ISO 9001:2015, ISO 14001:2015, BS OHSAS 18001:2007
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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