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The ProTech-GII is an overspeed safety device designed to safely shut down steam, gas, and hydro turbines of all sizes upon sensing an overspeed or overacceleration event. This device accurately monitors turbine rotor speed and acceleration via active or passive MPUs (magnetic pickups) and issues a shutdown command to the turbine’s trip valve(s) or corresponding trip system. The ProTech-GII consists of three independent modules whose trip outputs, dependent upon model used, are either independent or voted in a 2-out-of-3 configuration. An isolated bus architecture is used to share all inputs and latch status information between the three modules. Optionally each ProTech-GII module can be configured to use only its sensed “local” input signals or the voted result of all three modules’ signals in its event latch decision logic. Optionally module trip and alarm latch statuses can also be configured to be shared with all other modules. The ProTech-GII includes Overspeed and Over-acceleration functions as well as time stamped Alarm, and Trip logs. Indication that a test was active at the time of the event is provided on all logs and first-out indications are provided for Trip logs. The ProTech-GII also provides various pre-defined test routines including an automated periodic test routine to assist users with verifying system operation. There are several ways to interface with the ProTech-GII. The front panel allows the user to view current values, and to perform configuration and test functions. All of the features and most of the information available from the front panel are also accessible via the Modbus interface. Finally, the Programming and Configuration Tool (PCT) is software that is run on a PC to download log files and manage settings files. This product is designed for critical applications and when installed correctly complies with standards API-670, API-612, API-611, and IEC61508 (SIL-3).