Tigo Energy TS4-A-F Fire Rapid Shutdown Module adds on to your existing or new solar photovoltaic panels. For a complete TS4 platform, each solar panel in the PV system requires a TS4-A-F rapid shutdown module. Once installed in the back of the PV module, the TS4-A-F (formerly TS4-R-F) module provides an economical solution to comply with UL 1741, NEC 2014 and NEC 2017 rapid shutdown requirements. Tigo Energy offers a comprehensive library of technical documentation. As a part of the same family of Tigo TS4 modules is the TS4-A-O optimization module; it will improve energy harvesting, enhance system control, and provide increased flexibility.