Panasonic sf4b series extension cable and standard mounting bracket panasonic sfbccb3mu a 3m extension cable that is designed for use with the sf4b series of safety curtains it is used to connect the light curtain to other units or to a control unit there are two cables per set for both the receiver and the emitter the 12 core cable includes an interference prevention wire and one end of each cable assembly has discrete wires for easy connection panasonic sfbccb3mu extension cable 3m wit