ABB MLBL-04W Industrial Load Break Switch Device

The ABB MLBL-04W is a white 22 mm modular LED block that functions as the illuminated signaling element for ABB's MLBL pilot-device family, designed for front-mounted installation on 22 mm operator interfaces. This LED block integrates a white light source and provides two-position illumination from a 110–130 VAC supply, making it ideal for status indication on control panels in industrial automation. The module uses a screw-clamp terminal for straightforward wiring and carries part number 1SFA611621R1045, with the alternate catalog reference MLBL-04W. It measures approximately 44 mm wide by 35 mm deep by 10 mm high and is intended for front mounting in signaling assemblies on 22 mm panels. Typical applications include signaling the ON/OFF state of pushbuttons and selector switches in machine controls, panel indicators for process automation, and other 22 mm pilot-device installations where reliable, visible illumination is required in standard AC control circuits. As part of ABB's modular pilot-device ecosystem, the MLBL-04W complements standard 22 mm pushbuttons and selectors, enabling quick retrofit of indicator signaling without replacing the base device. The 110–130 VAC input range aligns with common control panel power supplies and is suitable for many process-control environments.