At Anord Mardix, we work with Schneider Electric, leaders in this field, to ensure that our STS units offer true redundancy and exceptional reliability for automatic transfer between power sources. We understand that you need a continued supply of power to any critical load and that any switching needs to be seamless.

With those essential elements in place, our STS range also has the advantage of being swappable in bypass mode – no interruptions – and available with surge protection and seismic floor stand on request. Talk to our experts if you’re considering STS and our team can give you the advice that you need.


  • Modular STS – no more guessing at which circuit boards have failed​
  • Compact design with extractable and replaceable STS Power Module that can be swapped in under 30 minutes while maintaining power to load via bypass​
  • Hot swappable fans and power supplies
  • STS Listed to UL 60950 and UL 891​
  • Automatically transfer power to a stable alternate source in less than 4ms under normal operating conditions. Even under extreme conditions, such as 180 degrees out of phase, our STS will have detection and automatic transfer times that are up to 10 times faster than many other switches


  • High reliability – internal redundant design​ with triple redundant power supplies, redundant fan cooling unit and logic
  • Easy and safe maintenance operations – reduced MTTR with an easily extractable and replaceable STS Module​
  • Adaptability to various electrical environments and load types
  • Fully accessible from the front for preventive maintenance


Ampere ratings 250, 400 and 600A
Voltage range Up to 480V
Frequency 50Hz/60Hz
 RMS voltage tolerance +/- 10%​
Tolerance to fast transients +/- 25%​
Frequency tolerance +/- 5%​
Admitted power factor No restriction​
Admitted overload 110% for 60 min, 150% for 2 min​
Inrush limiting 100% of transformer rating​
Dimensions W 1320mm x D 890mm x H 2135mm ​
Weight 1500 lbs​
Storage temperature -25 to 70 deg C (-13 to 156 deg F)​
Operating temperature 0 to 40 deg C (32 to 104 deg F) up to 50 deg C with derating​
Switch configuration 3-Pole 6 Switch, Redundant Load (standard)

3-Pole 5 Switch, Single Load (optional)

Minimum airflow (m3/h) 627​
Max relative humidity (non-condensing) 95%​
IP protection rating IP21C​
Color ​ Standard Black, Others Available



With over 100 years in the industry, we’ve loved working with a vast number of brands – no matter how big or small.

We’ve begun to document the journey with our clients, old and new, and release regular updates about completed projects on our Projects page. So, if you would like to read more about the type of clients we work with and the services we can offer, as well as our products in situ, then follow the link below. 

Our Projects

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