Schneider Thermal Overload Relay LRD14

Schneider Electric LRD14 Thermal Relay

Schneider Thermal Overload Relay LRD14 — Reliable Protection for Medium-Duty Three-Phase Motors

The Schneider Thermal Overload Relay LRD14 is a compact and dependable electrical protection device designed to safeguard three-phase motors against prolonged overcurrent, phase loss, and unbalanced load conditions. Part of Schneider Electric’s trusted TeSys LRD series, this overload relay delivers accurate, adjustable thermal protection — ideal for industrial panels, motor starter assemblies, and commercial electrical systems across India.

🔌 What Is the Schneider LRD14 Thermal Overload Relay?

The LRD14 Thermal Overload Relay is a three-pole bimetallic overload protection unit with an adjustable current range of 7 – 10 A — making it suitable for medium-load three-phase motors commonly found in control panels and machinery applications. It continuously monitors current in all three phases and disconnects power when sustained overload or abnormal phase conditions occur, helping protect motors from overheating and damage.

With a Class 10A trip characteristic, the LRD14 balances tolerance for normal motor start-up currents with quick response to prolonged overloads, aligning with IEC motor protection standards.

🔧 Key Features & Benefits

• Adjustable Current Range (7 – 10 A) — Lets you fine-tune overload protection to match your motor’s full-load current for accurate safeguarding.

• Three-Pole Thermal Protection — Monitors all three phases for overload, phase loss, and unbalance conditions.

• Class 10A Trip Characteristic — Designed to tolerate short start-up inrush yet react reliably to sustained overloads, following IEC 60947-4-1 norms.

• Phase Loss & Unbalance Detection — Improves motor safety by tripping when abnormal current conditions occur, preventing heat-related damage.

• Manual/Automatic Reset — Select easily between reset options to suit your application and maintenance routine.

• Auxiliary Contacts (1NO + 1NC) — Allows fault signalling to control panels and automation systems for enhanced safety.

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

• Compact, Direct Mount Design — Can mount directly with compatible Schneider contactors or be panel/DIN-rail mounted where space is limited.

⚙️ Why Use the LRD14 Overload Relay?

Thermal overload relays like the Schneider LRD14 play a critical role in motor protection by detecting prolonged overcurrent, phase loss, and imbalance — conditions that can cause motor overheating, winding insulation failure, and expensive downtime. By reacting quickly to unsafe conditions, this relay helps:

• Prevent costly motor damage from thermal stress

• Reduce unplanned downtime due to overload failures

• Enhance electrical system safety with phase-fault detection

• Extend motor lifespan through reliable, repeatable thermal protection

• Integrate seamlessly with Schneider contactors for compact motor starter assemblies

📌 Typical Applications

The Schneider Thermal Overload Relay LRD14 is ideal for use in:

• Motor starters and control panels

• Pumps, compressors & ventilation motors

• Conveyor systems and material handling equipment

• Commercial HVAC motor protection

• Machine tools and automated production lines

Its adjustable range and compact design make it suited for a wide range of three-phase motor installations across industrial and commercial environments.