3UB81234JW2

The 3UB81234JW2 is a 3-phase solid-state overload relay from Siemens' ESP200 (Class 48) series, engineered for high-precision thermal overload and phase fault protection of large industrial electric motors. Designed for -pole main power circuits operating up to with a wide adjustable current range of , this self-powered protective device safeguards heavy-duty motors against destructive electrical and thermal stresses. Electrically, the 3UB81234JW2 features selectable trip classes (Class 5, 10, 20, or 30) adjustable via DIP switches, enabling tailored protection for light to heavy-duty motor starting conditions. Its solid-state electronics continuously monitor line currents to provide rapid phase-loss detection (tripping in under 3 seconds), phase-unbalance monitoring, and ambient-insensitive operation. Equipped with 1NO + 1NC auxiliary contacts, a built-in test pushbutton, and thermal memory, it rapidly interrupts the contactor control circuit during sustained overloads, preventing insulation breakdown and winding damage without requiring separate heater elements. Mechanically, the 3UB81234JW2 features a compact, standalone housing designed for direct mounting to compatible contactors or panel backplates. Built with touch-safe screw terminals, an accessible FLA adjustment dial (with a 4:1 wide adjustment ratio), and a visual trip indicator, it provides straightforward installation and fast diagnostic troubleshooting inside motor control centers and custom automation enclosures. Purchase the 3UB81234JW2 at Electrical.com, your reliable partner for industrial and commercial electrical products. Our selection includes trusted electronic overload relays, motor starters, and power distribution equipment from manufacturers like Siemens, Eaton, Cutler-Hammer, and Schneider Electric, backed by a knowledgeable sales team ready to assist with technical questions, product selection, and support.