Siemens 500-033390, PTB Power Termination BoardCondition:* New Stock, In OEM Packaging. As Pictured.Additional Notes:* Designed For Use On a Siemens Modular (or FireFinder XLS) Control Panel* Model PSC-12 power supply comes packaged with a module called the Power Termination Board.* Required for full operation with a Model PSC-12.* Model PTB filters the power from the incoming AC mains and distributes it to the Model PSC-12 power supply and the optional Model PSX-12 power supply extender.Siemens500-033390