Uninterruptible Power Supply (UPS) - Static Transfer Switches (STS) Series

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Static Transfer Switches (STS) are designed to transfer the supply between two independent AC power sources. Unlike traditional automatic transfer switches (ATS), a static transfer switch provides a fast load transfer (typically 1/4 of a cycle), which ensures uninterrupted operation of sensitive electronic equipment.

The excellent overload capability and transfer algorithm enables fast fuse clearance in the event of a short-circuit. As a consequence the voltage immediately returns to normal to supply the other loads. The built-in transient voltage surge suppression system for SCR switches provides additional protection against damage to the supplied equipment.

Features

  • Selectable voltage limits for full flexibility to protect equipment against sags, swells and interruptions
  • Three redundant power supplies providing maximum reliability
  • Fail-Safe CMOS logic for fast and reliable control of the STS
  • Easy to install and to operate
  • Redundant cooling providing full functionality, even in case of a fan failure
  • Surge protection to prevent damage to the STS and the supplied equipment
  • Blocked transfer in case of short circuit preventing jeopardy to other users
  • Manual bypass for no-break operation of the load during maintenance
  • Dry contacts to provide status and alarm information to other control systems
  • Rackmounted models for easy integration into other systems
  • User friendly control panel for easy operation
  • Neutral dimensioned for 200% of nominal current to handle imbalanced loads (800/1000A: 160%)

 

 

Uninterruptible Power Supply (UPS) - Static Transfer Switches (STS) Series

 

Technical Specifications

Nominal current rating (A) 25 40 63 100 150 250 400 630 800 1000
Enclosures
1-pole, Stand Alone * G A B -
1-pole, 19 inch rackmount * H* -
2-pole, Stand Alone * G A B -
2-pole, 19 inch rackmount * H* -
3-pole, floorstanding cabinet * A B C F J
3-pole, 19 inch rackmounted * E -
4-pole, floorstanding cabinet * A B C F J
4-pole, 19 inch rackmount * E -
Weight (kg), only for 3- and 4-pole (preliminary) 60 68 72 195 195 195 280 280 350 380
Colour RAL 7032
Input characteristics
Nominal input voltage 400V ph-ph / 230V ph-N
Input voltage window -25% / +20%
Nominal frequency 50Hz
Frequency window -9% / +6%
Output characteristics
Efficiency > 99% at cos phi 0.8
Crest factor acceptance 3.5
Power factor (max. Cos phi) 0.5 - 1.0 (leading/lagging)
Overload behaviour 1 hour, 5 sec, 400 ms, 200 ms, 20 ms
Short circuit current withstand, kA (max 20 ms) 3.2 8 15 22.5 39 46 55
Transfer time (manual triggering) < 0.1 ms
Transfer time (automatic transfer) < 6 ms, typical: 3 ms
Settings
Overvoltage level setting + 6/9/13/16/20%, selectable by dipswitch
Undervoltage level setting 8/12/16/24%, selectable by dipswitch
Phase delay limit (for synchronised sources) 8/12/16/20/24 degrees, selectable by dipswitch
Transfer blocked after output current exceeding limit no blocking, 3/4.5/6/7.5/9 x nominal current, selectable by dipswitch
Transfer time (sources not synchronised) 13/17/25/50 ms, selectable by dipswitch
Delay for retransfer to preferred source 0.8/1/8/25 sec, selectable by dipswitch
Ambient conditions
Operating temperature 0 - 40 °C
Humidity < 95%, non-condensing
Altitude 1000 m (above 1000 m 5% derating per 500 m; max. 3000 m)
Cooling redundant cooling fans
Audible noise < 55 db(A)
EMC EN 50022 level B, EN 60555-2-3
Protection IP 20 (floorstanding), IP 00 (for rackmounted models)
Alarm / Status Contacts
Dry contacts 300 Vdc or 250 Vac / 0.3 Adc or 4 Aac at 220V
Status information manual transfer on, retransfer off, primary/secondary source OK, primary/secondary source on
Disturbance alarms primary/secondary source not healthy, sources not synchronized, manual control on
Failure alarms overload, overtemperature, fuse failure, internal STS failure

 

Enclosures hxwxd, mm: A: 1100x800x400 B: 1900x800x500 C: 1900x1200x500 D: 2300x1200x600 E: 710x483x465
  F: 2100x1200x600 G: 340x507x440 H: 113.5x483x415 J: 2300x1600x800 * manual bypass optional (133.5x483x197)
 
Specifications subject to change without prior notice