APsmart RSD‑D‑20 | Rapid Shutdown Solution | UL1741

RARSD-D meets SunSpec requirements, maintaining normal function by continually receiving a heartbeat signal fromthe APsmart Transmitter.The RSD-D executes rapid system shutdown when the Transmitter signal is absent. Users can manually execute rapid shutdownusingTransmitter breaker switch. Key Features Meets NEC 2017 & 2020 (690.12) requirements Executes rapid shutdown of systemwhenTransmitter-PLC signal is absent Meets SunSpec requirements Dual-input channel System Integration Overview The RSD‑D‑20 is part of APsmart’s rapid shutdown solution: Paired with an APsmart Transmitter‑PLC: it receives a “heartbeat” PLC signal to keep modules active. If the transmitter loses power or signal, the RSD‑D automatically disconnects the PV module from the system. Manual shutdown is possible via the breaker switch on the transmitter device  Wiring typically involves two RSD‑D units chained in series per string and connected back to the inverter, ensuring shutdown occurs at mod