S2S Electronics saf303-015 Soft Drive Control Module

The SAF303-015 Soft Drive is a 15 kW soft-start module from S2S Electronics, part of the Softdrive 300 series designed to deliver controlled acceleration for 3‑phase motors at 400 VAC. Identified by product code SAF303-015, this unit uses a current transformer rated at 1000:1 and a burden resistor of 18 (ohms), paired with a mains fuse rated at 80 A, to manage motor inrush and ramp profiles. The on‑board control electronics are powered by an integral control transformer, and for SAF303‑015 through SAF303‑030 units the control supply is wired internally to CL1 and CL2, simplifying installation. The soft‑start torque setting is specified as SAK6 with a 1 NM torque, and the enclosure supports motor conductors up to 10 mm in cross section. As part of the S2S Softdrive 300 family, SAF303‑015 provides ramping and torque control to smooth speed transitions and protect mechanical systems in industrial applications, such as conveyors, pumps, and machine tools where precise acceleration and reduced electrical stress are required.