Siemens 51SA2AALB Selector Switch Maintained 2-Position Long

Siemens 51SA2AALB is a two-position, maintained selector switch built for industrial control panels. This long-bushing variant (LB) features a white non-illuminated insert and is part of Siemens Furnas’ 51/52 selector switch family, designed to provide durable, lockable switching between two discrete circuits in harsh environments. Rated up to 600 VAC at 50/60 Hz and UL listed for use in NEMA 7/9 applications, it enables reliable panel-level control in equipment and process lines. The switch offers two maintained positions, enabling clean, static routing of control signals or power to alternate circuits without power in the OFF state, and is commonly used in machine control, safety interlocks, and process automation where a non-illuminated operator is preferred. This ALB variant corresponds to long-bushing mounting to suit deeper panel cutouts and ensures alignment with other Siemens 51-series components.