3RB2133-4UW1 SIEMENS

The 3RB2133-4UW1 from Siemens is an electronic overload relay designed to safeguard motors from excessive current draw, preventing damage and downtime. This particular model offers a wide current adjustment range from 12.5 to 50 Amperes, providing flexibility for various motor sizes and applications. It falls under size S2, indicating its physical dimensions and compatibility with specific motor starter combinations. The relay features adjustable tripping classes from 5 to 30, allowing users to fine-tune the response time based on the motor's thermal characteristics and application requirements. It is designed for standalone installation, simplifying mounting and wiring procedures. The main circuit adopts a straight-through transformer design for efficient current sensing. Screw terminals are used for both the main and auxiliary circuits, ensuring secure and reliable connections. Users can select between manual, automatic, or remote reset options to suit different operational needs. Furthermore, the 3RB2133-4UW1 incorporates internal ground fault detection, enhancing protection against insulation failures and ground faults.