Schneider Thermal Overload Relay LRD05

Schneider Electric LRD05 Thermal Overload Relay — Compact Protection for Small Motors

The Schneider Thermal Overload Relay LRD05 is a precision industrial motor protection device from Schneider Electric’s TeSys LRD series, designed to safeguard small three-phase motors against prolonged overcurrent, phase loss, and unbalanced load conditions. This compact thermal overload relay delivers dependable protection and is suitable for use in motor starter assemblies, control panels, and commercial electrical systems across India.

🔌 What Is the Schneider LRD05 Thermal Overload Relay?

The LRD05 is a three-pole thermal overload relay with an adjustable current protection range of 0.63 – 1 A — engineered to detect excessive motor current and trip the circuit before overheating and damage occur. It works seamlessly with Schneider TeSys contactors (such as LC1D09–LC1D32), forming a complete starter solution to help protect motors and reduce downtime.

Equipped with a Class 10A trip characteristic, the LRD05 tolerates typical motor start-up currents while providing reliable overload protection during sustained overcurrent conditions.

🛠️ Key Features & Benefits

• Adjustable Current Range (0.63 – 1 A) — Customize protection to match your motor’s full-load current for precise safeguarding.

• Three-Pole Thermal Monitoring — Detects overload, phase loss, and unbalance across all three phases.

• Class 10A Trip Characteristic — Reliable tripping on sustained overloads while tolerating normal start-up inrush.

• Phase Loss & Unbalance Detection — Protects motors by detecting abnormal phase conditions early.

• Manual/Automatic Reset Options — Choose reset behaviour that suits your maintenance and operation needs.

• Auxiliary Contacts (1NO + 1NC) — Provides fault signalling to control panels or automation systems.

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

• Compact Mounting Design — Can be mounted directly on compatible contactors or on DIN rails/panels for flexible integration.

⚙️ Why Use the LRD05 Overload Relay?

Thermal overload relays like the LRD05 play a critical role in three-phase motor systems by detecting excessive current and abnormal phase conditions early. This prevents motor overheating, reduces the risk of insulation failure, and helps:

• Prevent motor damage and failure due to sustained overload

• Minimise unplanned downtime and costly repairs

• Enhance overall electrical system safety

• Extend motor and equipment lifespan with dependable protection

• Integrate seamlessly with Schneider motor starters for compact control panels

Whether for new installations or control system upgrades, the LRD05 is a reliable choice for small motor protection.

📌 Typical Applications

The Schneider Thermal Overload Relay LRD05 is ideal for:

• Motor starter assemblies with compatible contactors

• Pumps, small compressors & fans

• Conveyor and material handling equipment

• HVAC motor control and ventilation drives

• Automated machinery and control panels where compact overload protection is needed