M12-3G is a M12 Y-connector for series connection of Adam OSSD M12-8 safety sensor with M12-8 cables. Connector #2 is a M12-8 female connector for connection of the safety sensor, connector #1 is a M12-8 male connector for connecting +24VDC, 0V and the incoming OSSD signals, and connector #3 is a M12-8 female connector for continuation of the circuit towards another safety device or the safety control device.