Schneider Thermal Overload Relay LRD02

Schneider Electric LRD02 Thermal Overload Relay — Precise Protection for Small Three-Phase Motors

The Schneider Thermal Overload Relay LRD02 is a compact and reliable industrial protection device from Schneider Electric’s TeSys LRD series, engineered to safeguard small three-phase motors from prolonged overcurrent, phase loss, and unbalanced load conditions. Its adjustable thermal setting range and robust design make it ideal for motor control panels, starter assemblies, and electrical systems across industrial and commercial setups in India.

🔌 What Is the Schneider LRD02 Thermal Overload Relay?

The LRD02 Thermal Overload Relay is a three-pole thermal protection unit with an adjustable current range of 0.16 – 0.25 A, designed to detect excessive current and disconnect the motor circuit before overheating or damage occurs. This relay is typically paired with Schneider TeSys contactors like LC1D09 through LC1D38 to create a complete motor starter solution.

With a Class 10A trip characteristic, the LRD02 balances tolerance for normal start-up currents with dependable performance during sustained overloads — conforming to IEC 60947-4-1 standards for thermal motor protection.

🛠️ Key Features & Benefits

• Adjustable Current Protection (0.16 – 0.25 A) — Precisely match the overload setting to your motor’s full-load current for tailored safeguarding.

• Three-Pole Monitoring — Ensures balanced detection of overload, phase loss, and unbalanced current events across all phases.

• Class 10A Tripping — Provides reliable overload response while tolerating brief start-up surges per IEC norms.

• Phase Loss Sensitivity — Reacts to abnormal phase conditions to protect motor health and reduce stress.

• Auxiliary Contacts (1NO + 1NC) — Enables control panel signalling for fault indication and automated monitoring.

• Manual Reset & Test Functions — Allows easy reset and verification of relay operation without powering down the system.

• Direct Mount Capability — Can be mounted directly under compatible TeSys contactors (LC1D series) or on DIN rail/panel with accessories.

• Compact Industrial Design — Saves space in electrical enclosures while delivering robust protection.

⚙️ Why Use the LRD02 Overload Relay?

Thermal overload relays like the LRD02 are essential in three-phase motor systems to ensure motors are protected against damaging thermal conditions. By reacting early to sustained overcurrent and phase irregularities, this relay helps you:

• Prevent motor overheating and insulation damage

• Reduce unplanned downtime and maintenance costs

• Enhance electrical system safety with dependable trip response

• Extend motor and equipment life with reliable protection

• Build compact, contactor-based motor starters for efficient control panels

The LRD02 is especially suited for smaller motors where precise and sensitive overload protection is required.

📌 Typical Applications

The Schneider Thermal Overload Relay LRD02 is ideal for:

• Small motor starter assemblies in industrial control panels

• Pumps, fans & compressors with light load motors

• Conveyor and material handling systems

• HVAC motor control and ventilation systems

• Automated equipment with small three-phase motors

Its adjustable protection and compact form factor make it a practical choice for varied industrial and commercial motor installations.