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PB-4R brand manufacturers: Crydom Inc, Anli stock, PB-4R reference price.Crydom Inc. PB-4R parameters, PB-4R Datasheet PDF and pin diagram description download.You can use the PB-4R I/O Relay Module Racks, DSP Datesheet PDF, find PB-4R pin diagram and circuit diagram and usage method of function,PB-4R electronics tutorials.You can download from the Anli.