Overview
The Siemens 3UA5800-2T overload relay is a plug-in thermal overload relay engineered for reliable motor protection in industrial automation, manufacturing, and process control systems. As part of the proven 3UA series, this relay combines bimetal sensing technology with adjustable trip settings to protect AC and DC motors from overload conditions, phase failure, and thermal stress.
Key Features
- Bimetal thermal sensing for accurate overload detection
- Adjustable current settings across the 40–57A range
- Manual and automatic reset options available
- Direct coordination with Siemens 3TF contactor series (3TF46, 3TF47, 3TF48, 3TF49)
- Phase imbalance and overheating protection
- Compact plug-in design for MCC and motor control panels
Technical Specifications
- Rated Current Range: 40–57A
- Sensing Technology: Bimetal thermal
- Reset Options: Manual and automatic
- Mounting Style: Contactor-mounted (plug-in)
- Suitable Contactors: Siemens 3TF46, 3TF47, 3TF48, 3TF49 series
- Protection Functions: Overload, phase failure, thermal overheating
- Motor Type: AC and DC
Typical Applications
- MCC Panels: Motor control centers requiring field-proven overload protection
- Pump Systems: Water supply, irrigation, and industrial pumping applications
- Conveyor Systems: Belt-driven production and material handling equipment
- Compressors: Air and refrigeration compressor motor protection
- HVAC Units: Heating, ventilation, and air-conditioning motor circuits
- Industrial Automation: Automated manufacturing and process control environments
Compatibility & Replacements
The 3UA5800-2T is designed as a direct replacement for original Siemens 3TF contactor-mounted overload relays. Third-party direct-replacement relays (such as Brah Electric) are also available and maintain full electrical and mechanical compatibility. When replacing, verify contactor model compatibility and ensure reset mode (manual vs. automatic) matches your application requirements. This relay is part of the obsolete 3UA5800 series, so used units may have limited availability—verify current stock before ordering.
