
Static Transfer Switches
Three Phase
Power Supply Security
Features:
• Ultra fast Break Before Make switching eliminates connecting
the two sources together even under fault conditions
• Less than 5ms transfer between synchronised sources
• Selectable preferred source
• A fuseless rugged, high reliability SCR device eliminates fuse
replacement
• Digitally controlled system set points
• Programmable synchronised and unsynchronised transfers
• Switched neutral option maintains isolation between sources
• Diagnostics and transfer tests to verify system readiness
• Load overcurrent transfer inhibit to prevent transfer of a fault to the
second source
• Dramatic increase in reliability and availability of critical devices
• Redundant cooling fans
• Integral isolated maintenance bypass sustains power to the load
even during maintenance and repair
• LCD display and keypad for messages, alarms, measurements,
diagnostics and settings of the parameters from the front panel
• RS232 bi-directional communication to provide monitoring and
setting of the STS via a PC
• 7 available dry contacts
Technical Specification
24
Model STS325 STS350 STS3100 STS3150 STS3200
Voltage 230/400VAC 4 wires
Frequency 50 or 60Hz +/-5%
Voltage Distortion <10%
Input
Current 25A 50A 100A 150A 200A
Voltage 230/400VAC 4 wires
Overcurrent Inhibit LCD front panel, MBP Standard
Output
Dimensions w x d x h (mm) 570 x 500 x 1415
RS232 Port Standard
Dry Contacts 7 dry contact outputs
Switched Neutral Optional
Ambient Temperature 0° - 40° C
Humidity 0 – 95% (non condensing)
Standards EN50091-2 class A ISO9001
AC/AC Efficiency >98%
Transfer Time <5m sec. Within CBEMA & IEEE for synchronised sources: <11m sec. For unsynchronised sources.
Transfer is always Break Before Make
Overload 150% for 15min. 1000% for 40m sec
General
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