The EKF brand ATS (Automatic Transfer Switch) is designed to provide backup power to a load connected to a power supply system that has primary and backup inputs. The ATS automatically connects the backup power line in case of voltage loss on the primary line. The ATS is designed as a monoblock and consists of a contact block and a control unit. The control unit features a manual override lever, a key mechanism for switching between manual and automatic control modes, and a locking mechanism to prevent switching of the ATS. TSR1 ATS operates only in the mains-to-mains scheme. The TSR1 ATS operates in the mains-to-mains scheme. To operate in mains-to-generator mode, the diesel generator must be connected to the corresponding contacts. Also, voltage presence monitoring is performed only on phase A; it is not recommended to use this device if it is necessary to monitor all three phases.