Siemens 48ATA1S00 Overload Relay

Siemens ESP200 48ATA1S00 solid-state overload relay provides motor protection by continuously monitoring load current and tripping the circuit when the set current is exceeded. Rated for 0.25 to 1.0 A, this Size A, single‑phase variant is identified by catalog number 48ATA1S00 and is designed for direct mounting to a Siemens motor starter or to a mounting panel/backplate. It uses screw-terminal interfaces for the auxiliary circuit and belongs to the ESP200 family, offering electronic protection with fast, repeatable trip characteristics compared with traditional thermal relays. The unit should not be used for DC motor applications and is intended for AC motors in typical starting circuits, where the adjustable current setting can be matched to the motor’s full‑load current to prevent nuisance trips. The 3UB8813 4AB2 suffix denotes the specific electrical connection/configuration for this model. This relay’s compact form factor and solid‑state design make it a common choice in control panels where space is limited and reliable protection is required.