3RB2123-4PB0

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The Siemens 3RB2123-4PB0 is a factory-grade electronic overload relay designed for reliable motor protection in industrial automation systems. This solid state overload relay offers an adjustable current range from 1 to 4 amps, making it suitable for various motor sizes. It features compact Size S0 housing and is class 5 to 30 compliant. The relay is engineered for easy DIN rail mounting and integrates seamlessly with Siemens contactors. With low power loss and screw terminal connections for both main and auxiliary circuits, the 3RB2123-4PB0 ensures dependable motor safeguarding against overloads, increasing system uptime and reducing downtime risks. Ideal for process control and production line systems, it supports stable and precise operation under varied electrical loads.

Key Features of Siemens 3RB2123-4PB0

  • Adjustable overload current range: 1 to 4 A
  • Compact Size S0 housing for space-saving panel design
  • Class 5 to 30 motor protection to meet diverse application needs
  • DIN rail mounting for straightforward installation
  • Durable screw terminal connections for main and auxiliary circuits
  • Low typical power loss of approximately 0.05 W enhances energy efficiency
  • Compatibility with Siemens contactors for modular system setup
  • Electronic solid-state design improves precision and reliability over thermal relays
  • Wide supply voltage range supporting 24 to 240 V AC/DC operation

Technical Specs of 3RB2123-4PB0

Explore Siemens 3RB2123-4PB0 technical data for detailed parameters.

Parameter Specification
Overload Current Range 1 to 4 A
Size S0
Class 5 to 30
Mounting DIN rail / Contactor mounting
Main Circuit Connection Screw terminal
Auxiliary Circuit Connection Screw terminal
Typical Power Loss 0.05 W
Supply Voltage 24–240 V AC/DC

Applications / Use Case

This Siemens 3RB2123-4PB0 is commonly used in industrial automation worldwide. It serves as motor protection in factory control panels, process control systems, and machine automation setups. Its reliable overload detection safeguards motors against overheating or damage during unexpected load spikes, helping maintain continuous operations in manufacturing lines, conveyor systems, and packaging equipment. The relay’s compact size and flexible mounting options make it ideal for retrofitting or new installations demanding precise motor overload control.

Price & Availability

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3RB2123-4PB0

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Does it come with a warranty?

Yes, All products are offered wth 1-Year warranty.

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All products sold are New & Unused.

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All products are delivered within 2-8 business days depending on our stock location.

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