3 Phase Static Transfer Switch
The STS is built with two independent power inlets. The load normally runs from the primary source. If the primary source fails, the secondary source...
View SpecificationsStage By Stage
Where Projects Go Wrong And How We Handle It
Feed Audit
Two feeds are often traced back to the same transformer
We ask for the single line diagram first and confirm the two inlets are genuinely independent.
Rating Selection
Switchgear gets sized on cabinet size instead of measured current
Ratings from 63 A to 400 A per phase are selected on actual per phase load current.
Sequencing
Break before make and priority behaviour are decided too late
Source A is set as priority and SCR transfer is first disconnect then connect, so there is no cross feed.
Build And Test
Transfer timing is assumed rather than measured
Transfer is exercised on both inlets and insulation and withstand tests are recorded before shipment.
Installation
Heat load in the cabinet room is already near the limit
Efficiency of 98 percent or better and fans that only start on over temperature keep added heat small.
Equipment
What The Solution Is Built From
FAQ
Questions Buyers Ask
Can the switch sit upstream of a UPS?
Yes. That is a common arrangement, where the switch gives source redundancy and the UPS gives ride through.
What if both sources fail?
A transfer switch selects between sources. Energy storage for a total loss has to come from a UPS or generator.
Start A Dual Source Power Redundancy Conversation
Send the site data. We will tell you what we need to size the equipment and what we can confirm straight away.