Schneider Electric LR3D21 - Overload Relay 12-18A (Class 10A)
Schneider Electric LR3D21 - Overload Relay 12-18A (Class 10A)

Schneider Electric LR3D21 - Overload Relay 12-18A (Class 10A)

Schneider Electric
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Schneider Electric LR3D21 is a Telemecanique TeSys LRD thermal overload relay designed for motor protection against overloads, phase failures, and unbalanced loads. It features an adjustable current range of 12-18 amps with Class 10A tripping, suitable for motors up to 7.5 kW at 400 V in a 3-pole configuration. The relay measures 2.6 in (66 mm) x 1.8 in (45 mm) x 2.8 in (70 mm) (Height x Width x Depth), weighs 0.317 lb, and is constructed for panel mounting within the TeSys D-Line family. It complies with IEC 60947-4-1 standards and operates within a temperature range of -13 to 158 °F (-25 to 70 °C). Typical applications include industrial motor control circuits requiring reliable thermal protection with manual reset via a blue push-button and red stop control.

Key Features & Specifications
  • Type: Overload Relay
  • Adjustable thermal current range: 12-18 A
  • Tripping class: 10A
  • Motor power rating: 7.5 kW at 400 V
  • Poles: 3
  • Suitable for unbalanced loads
  • Mounting type: Panel mount (TeSys LRD series)
  • Standards: IEC 60947-4-1 compliant
  • Control type: Manual reset with blue push-button
  • Stop control: Red push-button
  • Family: D-Line
  • Country of Origin: France
  • Dimensions: 2.6 in (66 mm) x 1.8 in (45 mm) x 2.8 in (70 mm) (Height x Width x Depth)
  • Weight: 0.317 lb
  • Temp Rating: -13–158 °F (-25–70 °C)


Product Identification
  • UPC: 785901206910
  • GTIN: 00389110348456