The Istec SpeedSys 300 is a high-integrity, SIL 3-rated overspeed protection system designed to function as an independent protection layer for critical rotating machinery, including gas and steam turbines, hydro turbines, and compressors . It provides fast and reliable detection of overspeed and acceleration events, initiating a safe shutdown with an 8ms relay system response time to prevent catastrophic failures .

The system features three isolated sensor inputs compatible with all common sensor types, including Hall-effect, electromagnetic, and proximity sensors. While only one sensor input is used at a time, the multiple inputs provide flexibility and redundancy options. It boasts an impressive measurement accuracy of 0.05% across a wide frequency range of 0.025 Hz to 35 kHz. The isolated inputs are certified for ATEX/IECEx Zone 0,1,2 (Ex ia), eliminating the need for external safety barriers .

Designed for long-term reliability and low cost of ownership, the SpeedSys 300 supports automated proof-tests with intervals of up to 10 years . It provides two double-pole single-throw safety relays and one safety analog output for integration with safety instrumented systems. Its compact design allows for installation in both new and existing machinery, and it can be configured as a standalone system or integrated into multi-module voting architectures to achieve the required safety integrity level.