PSL Assemblies Limited are designers and manufacturers of bespoke Static Transfer Switches and Rectifiers for specialist Uninterruptible Power Supplies.

Using our unrivalled ability to manufacture engineered thermal management products, we can design and build STS units to suit specific UPS parameters – whether for prototype or single project requirements – or for high volume production.

Some of the world’s best known Uninterrupted Power Supply manufacturers choose PSL to design and build specialist Static Transfer Switch units for safety-critical whole building applications such as hospitals, hotels and automotive production facilities.

To learn a little more about the development and history of our STS units, please click on the pdf link below:

STS 500A-6000A