MLBL-00BY is a yellow LED block with built-in leakage current protection designed for rear mounting in pilot device applications. It features a rated voltage of 12 V DC, a rated current of 12.0 mA, and emits light at a wavelength of 588 nm with a luminance of 380 mcd. The lamp block integrates one diode chip and is recommended to be paired with a matching yellow lamp cap or a clear cap. This LED block is part of ABB's Modular Range for 22mm pilot devices and is ideal for use in control panels, industrial machinery, and signaling applications where reliable visual indication is required.