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 module level per NEC requirements.

Certifications & Compliance

• NEC rapid shutdown compliance (2017/2020/2023 editions)

• AccessoriesUL 1741, CSA C22.2 No. 330‑17, IEC/EN 62109‑1

• FCC Part 15 and ICES‑003 EMC certifications

• SunSpec Alliance certified; TUV Rheinland certification available 

   

Datesheet

Download

Datasheet
APSmart_RSD-D-Datasheet_Rev1.5_2021-12-02.pdf

User Manual & Installation Guide
RSD-DTransmitter-User-Manual_NA_EN_REV3.4_2025-07-01.pdf?
RSD-D-Quick-Installation-Guide_Rev3.1_2025-04-02-1.pd
Certification
QW-ED-16-92-A1-North-America-FCCIC-RSD-D.pdf
QW-ED-16-95-A0-North-America-Sunspec-RSD-D.pdf
QW-ED-16-89-A3-North-America-cCSAus-RSD-D.pdf


About APsmart

From the developers at APsystems, APsmart offers state-of-the-art PV module rapid shutdown devices (RSD-S-PLC and RSD-D), ideal for any new or existing string or central inverter system, and meeting U.S. NEC 2017&2020 690.12 Rapid Shutdown requirements. Leveraging APsystems’ proven expertise in module-level power electronics, APsmart solutions are powered by ASIC with internal IP and integrated with TI chips at the system-level application.