Siemens 3UA50 00-1G Overload Relay
The Siemens 3UA50 00-1G is a thermal overload relay designed to provide reliable protection for AC motors operating within a current range of 4 to 6.3 amperes. This device safeguards motors against overload conditions and phase failures, ensuring operational safety and longevity.
Key Features
- Current Range: Adjustable between 4 and 6.3 A, accommodating various motor sizes and applications.
- Voltage Rating: Suitable for systems with a rated insulation voltage (Ui) up to 690 V, making it versatile for different industrial environments.
- Phase-Failure Protection: Detects and responds to phase loss, preventing potential motor damage.
- Temperature Compensation: Ensures consistent performance across a range of ambient temperatures.
- Reset Options: Equipped with both manual and automatic reset capabilities, offering flexibility in operation.
- Auxiliary Contacts: Includes 1 normally open (NO) and 1 normally closed (NC) contact for integration with control circuits.
- Mounting Compatibility: Designed for seamless integration with Siemens contactors, such as the 3TF30, 3TF31, 3TF40, 3TF41, 3TB40, and 3TB41 series.
Technical Specifications
- Trip Class: 10A, providing timely response to overload conditions.
- Terminal Torque: 9–13 lb.in (1–1.5 Nm), ensuring secure electrical connections.
- Utilization Category: B600/R300, indicating suitability for various control applications.
- Weight: Approximately 180 grams, facilitating easy handling and installation.
The Siemens 3UA50 00-1G Overload Relay is engineered to deliver dependable motor protection, enhancing the safety and efficiency of industrial operations.

















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