Power transfer switches increase the resilience of your uninterruptible power supply installation. The transfer switch connects to the critical load and provides two power sources (referred to as ‘A’ and ‘B’ supplies. These can be two separately derived mains power sources or two UPS systems or combination of the two. When one power source fails, the other automatically powers the critical load.
There are two types of switch. Automatic Transfer Switches (ATS) are generally relay-based whilst Static Transfer Switches (STS) make use of static electronics to provide a break-free transfer. In terms of form factor, ATS devices are designed for server racks and will be rack mounted or wall mounted. STS products are designed for larger room-sized loads including three-phase applications and can be sized up to several hundred Amps in power rating.
For more information on our automatic transfer switches or static transfer switches please contact our projects team.