Schneider Thermal Overload Relay LRD332

Schneider Electric LRD332 Thermal Overload Relay — Reliable 23–32 A Three-Phase Motor Protection

The Schneider Thermal Overload Relay LRD332 is a dependable industrial motor protection device designed to safeguard medium-load three-phase motors from prolonged overcurrent, phase loss, and imbalance conditions. Part of Schneider Electric’s TeSys LRD series, this thermal overload relay delivers accurate and consistent motor protection — ideal for control panels, motor starter assemblies, and machinery installations in industrial and commercial environments across India.

🔌 What Is the Schneider Thermal Overload Relay LRD332?

The LRD332 is a three-pole thermal overload relay built for use with compatible Schneider Electric contactors (e.g., LC1D40A, LC1D50A, LC1D65A) to form robust motor starter systems. It continuously monitors current in all three phases and trips the motor circuit when prolonged overload, phase loss, or unbalanced conditions are detected, helping prevent motor winding overheating and associated damage.

With an adjustable current range of 23–32 A, the LRD332 is suited for medium-capacity three-phase motors typically found in industrial machines and equipment. Its Class 10A tripping characteristic tolerates normal start-up currents while responding reliably to sustained overload conditions.

🛠️ Key Features & Benefits

• Adjustable Thermal Protection (23 – 32 A) — Match overload protection precisely to your motor’s full-load current for tailored safeguarding.

• Class 10A Trip Curve — Balances tolerance for brief start-up inrush currents with dependable tripping under sustained overloads.

• Three-Pole Monitoring — Monitors all phases for overload, phase loss, and unbalanced conditions.

• Phase Loss & Unbalance Detection — Protects motors by detecting abnormal current conditions and disconnecting power promptly.

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

• Manual/Automatic Reset & Test Button — Offers flexible reset options and easy verification of relay function without shutting down the system.

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

• DIN Rail or Direct Mounting — Install directly beneath compatible contactors or on a DIN rail for flexible integration.

⚙️ Why Use the LRD332 Overload Relay?

Thermal overload relays like the LRD332 are essential in protecting three-phase motors from conditions that can cause overheating, insulation failure, or premature wear. By detecting excessive current and phase irregularities early, this relay helps:

• Prevent costly motor failure and winding damage

• Minimise unplanned downtime and maintenance expenses

• Enhance overall electrical system safety

• Extend motor and equipment life through reliable protection

• Integrate seamlessly with Schneider contactor-based starter systems for compact, efficient panels

📌 Ideal Applications

The Schneider Thermal Overload Relay LRD332 is suitable for a range of industrial and commercial motor protection tasks, including:

• Motor starter assemblies in control panels

• Pumps and compressors

• Conveyor and material handling systems

• HVAC motor control applications

• Automated production machinery

• Electrical switchgear requiring dependable three-phase overload protection

This makes the LRD332 a practical choice for electricians, panel builders, and engineers aiming for dependable motor protection in industrial environments.