Schneider Thermal Overload Relay LRD08

Schneider Electric LRD08 Thermal Overload Relay — Schneider Thermal Overload Relay LRD08

The Schneider Thermal Overload Relay LRD08 is a reliable and compact industrial protection device engineered to safeguard three-phase motors against prolonged overcurrent, phase loss, and load imbalance. As part of Schneider Electric’s trusted TeSys LRD series, this thermal overload relay delivers accurate and adjustable protection — ideal for motor control panels, starter assemblies, and machinery electrical systems across factories, workshops, and commercial installations in India.

🔌 What Is the Schneider LRD08 Thermal Overload Relay?

The LRD08 Thermal Overload Relay is a three-pole differential thermal overload relay designed to monitor current flowing through each phase of a three-phase motor circuit and disconnect power when sustained overload or abnormal phase conditions occur. It features an adjustable current protection range from 2.5 A to 4 A, making it suitable for protecting small three-phase motors up to approximately 1.1–1.5 kW at 400 V AC.

With a Class 10A trip characteristic, the LRD08 tolerates normal motor start-up inrush currents while responding reliably to sustained overloads, conforming to IEC motor protection standards. This ensures both performance and safety in medium-duty electrical environments.

🛠️ Key Features & Benefits

• Adjustable Current Range (2.5 – 4 A) — Tailor overload protection to match your motor’s full-load current for precise safeguarding.

• Three-Pole Thermal Monitoring — Detects overload, phase loss, and unbalanced conditions across all three phases to protect motor health.

• Class 10A Trip Characteristic — Offers dependable overload tripping while tolerating brief startup current surges.

• Phase Failure Sensitivity — Trips when phase irregularities occur, helping reduce motor stress and prevent failure.

• Manual/Automatic Reset Options — Choose between reset modes based on application needs for convenience and maintenance.

• Test/Trip Button — Allows easy functional testing without disconnecting power, improving maintenance checks.

• 1NO + 1NC Auxiliary Contacts — Enables fault signalling to control panels or automation systems for enhanced visibility.

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

• Compact Design — Fits under compatible Schneider contactors (LC1D09–LC1D38) or can be mounted on DIN rail/panel.

⚙️ Why Use the LRD08 Overload Relay?

The Schneider LRD08 Thermal Overload Relay is essential for protecting motors from conditions that can cause overheating, insulation breakdown, and premature wear. It helps:

• Prevent costly motor damage by detecting prolonged overcurrent early

• Reduce unplanned downtime and repair costs

• Enhance system safety by detecting phase faults promptly

• Extend motor service life through dependable thermal protection

• Integrate easily with Schneider contactors for compact and efficient motor starter assemblies

This makes the LRD08 a practical choice for panel builders, electricians, and maintenance teams working with small three-phase motors in industrial and commercial settings.

📌 Typical Applications

• Motor starter assemblies in control panels

• Pumps, fans & small compressors

• Conveyor and material handling systems

• HVAC motor control and ventilation drives

• Industrial machines with small motors

• General motor protection circuits

Whether installing new systems or upgrading existing ones, the LRD08 delivers dependable motor protection and peace of mind.