The APsystem Rapid Shutdown System (RSS) Transmitter-PLC is part of a rapid shutdown solution when paired with APsystems RSD-S-PLC, a PV module rapid shutdown unit. While powered on, the RSS Transmitter sends a signal to the RSD-S-PLC units to keep their PV modules connected and supplying energy. RSD-S-PLC units automatically enter rapid shutdown mode when the RSS Transmitter-PLC is switched off and resume energy production when power is restored to the RSS Transmitter. This solution complies with NEC 690.12 specifications for 2017 and supports the SunSpec signaling for rapid shutdown.