The 51-256.025 is a non-illuminated, red mushroom-head actuator designed for panel mounting. It features a maintained switching action with a twist-to-unlock release mechanism and incorporates a self-cleaning, double-break snap-action switching system with one normally closed and one normally open gold contact. This actuator is rated for 250 VAC at 5 A, has a mechanical lifetime of 100,000 cycles, and connects via soldering terminals. With its robust IP65 front protection and an operating temperature range of -25°C to +55°C, it is suitable for use in various industrial control applications requiring reliable, maintained actuation.