Weidmueller VRSTI/4,0-6,0

This appears to be a specific type of electrical component, likely a crimp-style cable lug or connector manufactured by Weidmüller. The "4,0-6,0" likely refers to the cross-sectional area of the cable it's designed for, specifically 4.0 to 6.0 mm². VRSTI probably signifies a specific product series within Weidmüller's offerings.