The ‌ALSTOM STO1726KO1‌ is a SIL 3-certified Safety Torque Off (STO) module designed for critical drive systems in industrial automation. As part of ALSTOM’s Protexis D-Safe series, this fail-safe interface provides immediate motor deceleration by cutting power to inverter outputs within 2ms. The ‌STO1726KO1‌ integrates dual-channel redundancy with cross-monitoring circuits, achieving 99.999% fault detection coverage per IEC 61800-5-2 standards.