1SFA611621R1044

ABB 1SFA611621R1044 (MLBL-04L) is a blue modular LED illumination block designed for industrial control panels, pilot lights, illuminated push buttons, and automation systems. Operating at 110–130V AC, it features an integrated blue LED that provides clear visual indication of equipment status, operating conditions, and electrical control signals. Part of ABB's modular plastic pilot device range, this compact LED block supports front mounting with compatible ABB operators and mounting accessories.