Schneider Thermal Overload Relay LRD35

Schneider Electric LRD35 Thermal Overload Relay — Reliable Motor Protection

The Schneider Thermal Overload Relay LRD35 is a precision motor protection device from Schneider Electric’s TeSys LRD series, designed to safeguard three-phase motors against prolonged overcurrent, phase loss, and imbalance conditions. Ideal for industrial and commercial electrical systems across India, this thermal overload relay ensures dependable protection and helps extend motor life while reducing unexpected downtime.

🔌 What Is the Schneider LRD35 Thermal Overload Relay?

The LRD35 is a three-pole thermal overload relay with an adjustable current protection range of 30 – 38 A. It continuously monitors current in all three phases and disconnects the motor circuit during sustained overloads or abnormal phase conditions, helping prevent overheating and insulation breakdown. This relay is commonly used in motor starter assemblies alongside Schneider contactors (such as LC1D38, LC1D40A, and LC1D50A) to form a complete and robust motor control solution.

With its Class 10A trip characteristic, the LRD35 tolerates normal motor start-up inrush currents yet reacts reliably to prolonged overloads — balancing protection with continuous operation.

🛠️ Key Features & Benefits

• Adjustable Current Range (30 – 38 A) — Tailor overload protection to your motor’s full-load current for accurate safeguarding.

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

• Class 10A Trip Characteristic — Provides reliable trip response while tolerating short start-up currents.

• Phase Loss & Unbalance Detection — Improves motor safety by tripping during abnormal current conditions.

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

• Manual/Automatic Reset & Test Function — Offers flexible reset options and easy testing without powering down.

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

• Flexible Mounting — Compatible with direct mount under contactors or DIN-rail/panel installations.

⚙️ Why Use the LRD35 Overload Relay?

Thermal overload relays like the LRD35 are essential components in three-phase motor systems. By detecting sustained overcurrent and abnormal phase conditions early, this relay helps:

• Prevent costly motor overheating and winding damage

• Reduce unplanned downtime and maintenance costs

• Boost electrical system safety with early fault tripping

• Extend motor and equipment life with dependable protection

• Integrate seamlessly with Schneider contactors for compact motor starters

Whether you are designing new control panels or upgrading existing systems, the LRD35 delivers reliable protection where it matters most.

📌 Typical Applications

The Schneider Thermal Overload Relay LRD35 is ideally suited for:

• Motor starter panels in industrial and commercial installations

• Pumps, compressors & ventilation systems

• Conveyor and material handling equipment

• HVAC motor control applications

• Automated production lines and machine tools

Its versatile protection profile makes it a trusted choice for engineers, electricians, and system integrators working on three-phase motor systems.