Siemens 3UB8523-6DW2 958LDB3SA Solid State Overload Relay

Siemens 3UB8523-6DW2 is a solid-state overload relay from the ESP200 family designed for three-phase motor protection. It covers a current-setting range of 5.5–22 A and is intended for DIN-rail mounting with screw-terminal wiring. The device is specified for operation in ambient temperatures from -25 to 60 C and has a height of about 2.12 inches, making it suitable for compact control panels. The model is identified by the 958LDB3SA marking and represents a single overload relay within the ESP200 lineup for three-phase circuits. This relay is designed for use with compatible Siemens motor starters in three-phase configurations, providing solid-state protection against overload conditions.