Siemens Industrial Controls 3UB8523-5EW2 Solid State Overload Relay - ESP200 10-40A 3-Phase

The Siemens Industrial Controls 3UB8523-5EW2 is a solid-state electronic overload relay from the ESP200 series, designed to provide advanced motor protection for three-phase electrical systems. This relay monitors current flow continuously and trips the circuit when overload conditions are detected, preventing motor damage from overheating, phase loss, and phase unbalance.

Key Features:

• Current range: 10 to 40 amps with 4:1 adjustment range for precise full load amp settings
• Three-phase configuration suitable for compressors, air handlers, pump motors, and HVAC applications
• Selectable trip class 5, 10, 20, or 30 via DIP switches for light, normal, and heavy starting conditions
• Self-powered solid-state design with over 99% repeat accuracy for reliable protection
• Phase loss protection trips in less than 3 seconds to prevent motor burnout
• Phase unbalance protection minimizes motor temperature rise in asymmetrical systems
• Thermal memory feature prevents motor restart while still hot
• Manual and automatic reset options with 3-minute automatic reset delay
• Operating temperature range: -25°C to 60°C (-13°F to 140°F)
• Contact configuration: 1NO/1NC (B600/R300 rated)
• Screw terminal connections with removable terminal block for easy servicing
• Direct mounting and stand-alone installation options
• Test button verifies complete electronic function including trip mechanism

The heaterless solid-state design eliminates the need for replacement heaters after short circuits and minimizes heat buildup in enclosures, reducing ventilation costs. The conformally coated circuit board provides resistance against harsh environmental conditions, ensuring long-term reliability in industrial applications.