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Schneider Electric LR3D12 - Overload Relay 5.5-8A (TeSys D)

Schneider Electric
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The Schneider Electric LR3D12 is a thermal overload relay from the TeSys D family, designed to protect motors from overloads, phase failures, and prolonged starting times. It operates within a current range of 5.5 to 8 amperes and is rated for use in AC and DC control circuits. This compact relay measures 2.6 inches (66 mm) in height, 1.8 inches (45 mm) in width, and 2.8 inches (70 mm) in depth, weighing 0.311 lb, and features a manual or automatic reset function with a trip-free design. It complies with multiple international standards, including EN/IEC 60947-4-1, UL 60947-4-1, CSA C22.2 No 60947-4-1, and GB/T 14048.4, ensuring global acceptance. Typical applications include motor protection in industrial machinery, conveyors, pumps, and HVAC systems, where reliable overload and phase failure protection is required.

Key Features & Specifications
  • Type: Thermal overload relay, Class 10, with manual/auto reset and trip-free mechanism
  • Voltage Rating: 690 V AC (max) for main circuit; 600 V AC for control circuit
  • Current Rating: 5.5 A minimum to 8 A maximum
  • Dimensions: 2.6 in (66 mm) x 1.8 in (45 mm) x 2.8 in (70 mm) (Height x Width x Depth)
  • Standards: EN/IEC 60947-4-1, EN/IEC 60947-5-1, UL 60947-4-1, UL 60947-5-1, CSA C22.2 No 60947-4-1, CSA C22.2 No 60947-5-1, GB/T 14048.4, GB/T 14048.5, EN 50495
  • Applications: Motor protection in industrial machinery, conveyors, pumps, HVAC systems
  • Switch Type: Thermal overload relay
  • Configuration: 3-pole, trip-free
  • Coil Voltage Maximum: 690 V AC
  • Temp Rating: -20°C to +60°C (operating)
  • Shipping Dimensions: 3.0 in x 2.0 in x 3.0 in (approx)
  • Phase: 3-phase
  • Voltage: 690 V AC (max)
  • Amperage: 5.5 A to 8 A
  • AIC rating: Not specified
  • Connection: Screw terminals
  • Poles: 3
  • Protection: Overload, phase failure, phase imbalance
  • Functions: Overload protection, phase failure detection
  • Frame Size: TeSys D
  • Trip Type: Thermal (bimetallic)
  • Panel Type: Not applicable
  • Breaker Type: Not applicable
  • Control Voltage Minimum: 24 V AC/DC
  • Control Voltage Maximum: 600 V AC
  • MCM Size: Not applicable
  • Metal Type: Not applicable
  • Panel Style: Not applicable
  • Bus Type: Not applicable
  • Fuse Class: Not applicable
  • Insulation Temperature: 85°C (max)
  • Inductance: Not applicable
  • Impedance: Not applicable
  • Barrels: Not applicable
  • Class Rating: Class 10
  • Diameter: Not applicable
  • Velocity: Not applicable
  • Clip Center: Not applicable
  • Clas: Not applicable
  • Mounting: DIN rail or screw mount
  • Hz: 50/60 Hz
  • Coil Material: Bimetallic strip
  • Horse Power: Not specified
  • Aux Contacts: 1 NO + 1 NC
  • CPT: Not applicable
  • Full Load Amps: 5.5 A to 8 A
  • Dist Voltage: Not applicable
  • Bucket Size: Not applicable
  • Bucket Style: Not applicable
  • Bucket Type: Not applicable
  • Full Load Amp Maximum: 8 A
  • Full Load Amp Minimum: 5.5 A
  • Enclosure: Open type
  • Relay Style: Thermal overload
  • Coil Voltage Minimum: 24 V AC/DC
  • Wire: Not applicable
  • Amperage Maximum: 8 A
  • Amperage Minimum: 5.5 A
  • Nema Rating: Not specified
  • Switch Style: Not applicable
  • Wire Size: 14 AWG to 10 AWG
  • Certification: EN/IEC 60947-4-1, UL 60947-4-1, CSA C22.2 No 60947-4-1, GB/T 14048.4, EN 50495
  • Circuit Breaker Mounting Style: Not applicable
  • Terminal Connection: Screw terminals
  • Frequency Rating: 50/60 Hz
  • Phase Connection: 3-phase
  • Standards: EN/IEC 60947-4-1, UL 60947-4-1, CSA C22.2 No 60947-4-1, GB/T 14048.4, EN 50495
  • Compatible Frames: TeSys D contactors
  • Installation Type: DIN rail or screw mount
  • Item QTY: 1
  • Nema Starter Size: Not specified
  • Breaker Frame: Not applicable
  • Current Rating: 5.5 A to 8 A
  • Reverse Standoff Voltage: Not applicable
  • Watts: Not applicable
  • Peak Pulse Current: Not applicable
  • Breakdown Voltage (MIN VBR@IT ) (V): Not applicable
  • Breakdown Voltage (VBR@IT) (V): Not applicable
  • Polarity: Not applicable
  • Operating Temperature Maximum Celsius: 60°C
  • Max Clamp Voltage: Not applicable
  • On-State Current: Not applicable


Product Identification
  • UPC: 785901206873
  • GTIN: 00389110346964