Schneider EasyPact TVS Thermal Overload Relay LRE357

Schneider EasyPact TVS Thermal Overload Relay LRE357 — Reliable Motor Protection for Industrial Three-Phase Systems

The Schneider EasyPact TVS Thermal Overload Relay LRE357 is a robust protection device engineered to safeguard three-phase motors against prolonged overload, phase loss, and unbalanced load conditions in industrial and commercial electrical installations. Part of Schneider Electric’s EasyPact TVS range, this thermal overload relay delivers dependable performance, easy installation, and compliance with international safety standards — making it ideal for motor control panels, starter assemblies, and machinery across India.

🔌 What Is the LRE357 Thermal Overload Relay?

The LRE357 is a three-pole differential thermal overload relay with an adjustable current protection range of 37 – 50 A, designed to protect medium-capacity three-phase motors. It continuously monitors current across all phases and trips the motor circuit when sustained overloads or phase faults are detected, preventing motor winding overheating and potential damage. The relay follows Class 10A tripping characteristics in accordance with IEC 60947-4-1 standards, balancing protection sensitivity with tolerance for normal start-up currents.

This relay can be directly mounted on compatible EasyPact TVS contactors (such as LC1E40–LC1E95), reducing wiring complexity and panel space while ensuring reliable motor protection.

🛠️ Key Features & Benefits

• Adjustable Current Range (37 – 50 A): Customise thermal overload settings to match the motor’s full-load current for accurate protection.

• Class 10A Trip Curve: Offers dependable overload response while tolerating normal motor start-up inrush.

• Three-Pole Differential Protection: Monitors all three phases for overload, phase loss, and unbalance conditions to enhance motor safety.

• Auxiliary Contacts: Enables fault signalling to control panels, alarms, or PLC systems (contact configuration varies by variant).

• Manual & Automatic Reset: Choose reset behaviour based on your maintenance and operation needs.

• Trip Indicator Flag: Provides visual indication of trip status for quick diagnostics.

• Secure Screw-Clamp Terminals: Provides reliable, vibration-resistant electrical connections.

• Direct Contactor Mounting: Simplifies installation with compatible EasyPact TVS contactors, reducing panel wiring and space requirements.

⚙️ Why Choose the LRE357 Overload Relay?

Thermal overload relays like the LRE357 are essential in motor control systems because they:

• Prevent motor overheating and thermal damage by disconnecting the circuit before sustained overloads cause harm

• Reduce unplanned downtime and maintenance costs through early fault detection

• Improve electrical system safety with phase-fault and overload response

• Extend motor and equipment life with reliable thermal protection

• Integrate easily with EasyPact TVS contactor-based motor starters for compact designs

Whether you’re designing new motor control panels or upgrading existing systems, the LRE357 delivers dependable overload protection where performance and safety matter most.

📌 Typical Applications

The Schneider EasyPact TVS Thermal Overload Relay LRE357 is ideal for use in:

• Motor starter assemblies with compatible EasyPact TVS contactors

• Pumps, compressors & blower motors

• Conveyor and material handling systems

• HVAC motor control and ventilation drives

• Production machinery and automated systems requiring medium-power motor protection

This makes the LRE357 a practical choice for industrial automation, manufacturing, and commercial electrical installations.