3UB81134BB2 Overload Relay – Solid State Motor Protection

The Siemens 3UB81134BB2 Overload Relay is a solid state device designed for protecting single phase and polyphase motors in industrial electrical applications. Suitable for use by electrical distributors and switchgear suppliers, this relay provides reliable motor overload protection with versatile mounting options including direct and DIN rail mounting. It is compatible with NEMA and IEC contactors and can be used as a retrofit for other brands, making it an efficient solution for wire and cable control systems and lighting solutions requiring motor protection.

Specifications

• Application: Single phase and polyphase motors
• Number of Poles: 3
• Contact Configuration: Normally Open / Normally Closed (NO/NC)
• Contact Rating: B600 / R300
• Maximum Motor Voltage: 600 V
• Maximum Switching Voltage: 600 V
• Mounting Type: Direct
• Mounting: Direct / DIN Rail
• Product Weight: 0.4500 kg
• Manufacturer: Siemens
• Manufacturer Part Number: 3UB81134BB2

Features

• Field selectable Trip Class 5, 10, 20, or 30 via DIP switches for flexible motor protection
• 4:1 current adjustment range with fine adjustment dial labeled in full load amps
• Heaterless solid state design minimizes heat buildup, reducing ventilation or cooling costs
• Easily accessible reset button with visible and audible trip indication for quick restart readiness
• Designed to replace thermal or ESP100 overload relays with identical dimensions and footprint
• Can be directly coupled to contactors or remotely mounted for installation flexibility
• Compatible with NEMA and IEC contactors and other types of motor controllers

Downloads & Links

• Catalog