The Gatesea rapid shutdown PLC signal transmitter meets the requirements of the NEC 2017&2023 (690.12)  rapid shutdown specification and the SunSpec rapid shutdown protocol. Both single and dual core are available  for option,and both 85-264VAC and 180-550VAC power supplies are available for option, 85-264VAC for residential  and 180-550VAC for commercial. Normally, the rapid shutdown transmitter sends keep alive signal to the rapid shutdown receiver to turn the  PV system on.In emergency case, activate the emergency stop switch or disconnect the transmitter’s power  supply to rapid shutdown the PV modules. When the rapid shutdown signal transmitter is activated again, the  PV system resumes power production again.