440R-N23126440R-N23129440R-N23131440R-N23132440R-N23135440R-P23071440R-P23073440R-P4NANS440R-S07139440R-S12R2 概述:可扩展安全继电器采用模块化设计,便于未来扩展,可减少库存并降低接线成...