Schneider Thermal Overload Relay LRD06

Schneider Electric LRD06 Thermal Overload Relay — Compact Protection for Small Three-Phase Motors

The Schneider Thermal Overload Relay LRD06 is a precision protection device from Schneider Electric’s TeSys LRD series, designed to protect small three-phase motors from prolonged overcurrent, phase loss, and unbalanced load conditions. This reliable thermal overload relay is ideal for industrial and commercial motor control panels, starter assemblies, and electrical systems where dependable overload protection is essential.

🔌 What Is the Schneider LRD06 Thermal Overload Relay?

The LRD06 is a three-pole thermal overload relay with an adjustable current protection range of 1 – 1.6 A, suitable for safeguarding small motors typically up to around 0.55 kW at 400 V AC. It continuously monitors current in all three phases and disconnects power when the current exceeds the set value for a sustained period, preventing motor winding overheating and potential damage. Designed to be paired with Schneider contactors (e.g., LC1D09–LC1D38), the LRD06 is a practical choice for compact motor starter assemblies and panel installations.

The relay uses a Class 10A trip characteristic, which tolerates brief startup inrush currents while reliably reacting to sustained overload conditions — aligning with IEC 60947-4-1 standards for motor protection.

🛠️ Key Features & Benefits

• Adjustable Current Range (1 – 1.6 A) — Fine-tune overload protection to match your motor’s full-load current for precise safeguarding.

• Class 10A Trip Characteristic — Balanced response that tolerates normal startup surges yet trips on prolonged overloads.

• Three-Pole Thermal Monitoring — Ensures comprehensive protection across all three phases of the motor circuit.

• Phase Loss and Imbalance Detection — Trips the relay when abnormal phase conditions occur, reducing motor stress.

• Manual/Automatic Reset Options — Choose reset behaviour based on application needs for flexible maintenance.

• Auxiliary Contacts (1NO + 1NC) — Allows integration with control panels and automation systems for fault signalling.

• Secure Screw-Clamp Terminals — Provides reliable, vibration-resistant connections for power and control wiring.

• Compact Industrial Design — Fits conveniently under compatible TeSys contactors or on DIN rails/panels, saving space in electrical enclosures.

⚙️ Why Use the LRD06 Overload Relay?

Thermal overload relays like the Schneider LRD06 are essential in three-phase motor circuits to detect excessive current and phase irregularities early. The LRD06 helps:

• Prevent motor overheating and winding damage before failure occurs

• Reduce unplanned downtime with early fault detection

• Enhance system safety through reliable overload and phase fault protection

• Extend motor life by protecting against damaging thermal stress

• Integrate seamlessly with Schneider contactors for compact, efficient motor starter assemblies

This makes the LRD06 suitable for applications such as pump drives, conveyors, compressors, and other small motor-driven systems.

📌 Typical Applications

• Motor starter assemblies in industrial control panels

• Pumps, compressors & fans

• Small conveyor and material handling systems

• HVAC motor protection and ventilation drives

• Automated machinery and equipment requiring motor overload safeguarding