Telemecanique LR1-D63357 Thermal Overload Relay

Description

The Telemecanique LR1-D63357 is a robust 3-pole thermal overload relay designed for reliable motor protection. This unit is part of the classic Telemecanique line, known for its durability and performance in demanding industrial environments. It provides Class 10 overload protection and is adjustable within a range of 37 to 50 amperes. This relay is engineered for direct mounting onto Telemecanique LC1-D series contactors, ensuring a compact and efficient motor starter assembly.

Specifications

• Manufacturer: Telemecanique (now Schneider Electric)
• Model: LR1-D63357
• Product Type: Thermal Overload Relay
• Number of Poles: 3
• Thermal Setting Range: 37 A to 50 A
• Trip Class: Class 10 according to IEC 60947-4-1
• Rated Insulation Voltage (Ui): 660 V AC
• Auxiliary Contacts: 1 NO + 1 NC
• Mounting Style: Direct mounting on LC1D40A, LC1D50A, LC1D65A contactors

Label Info

• Brand: Telemecanique
• Type: LR1-D63357
• Current Range: 38 / 44 / 50 A
• Approvals: IEC, VDE, BS, JEM, UL, CSA

Application

This relay is ideal for protecting AC motors against overloads, phase failure, and prolonged starting times. It is commonly used in industrial machinery, conveyor systems, pumps, fans, and other applications requiring dependable motor control and protection.

Country of Origin

Made in France.

CO2 Impact

Choosing this pre-owned component avoids the production of a new one, saving an estimated 20 kg of CO2. This is comparable to the emissions from driving a car for 100 kilometers.

Availability

This is an obsolete item but is available from our stock. Order now from PLC2Day for expert support and fast delivery.

FAQ

What is the difference between the LR1-D63357 and the modern LRD3357?

The LRD3357 is the direct modern replacement from Schneider Electric's TeSys line. While functionality is nearly identical, the LRD series may feature improved materials, updated certifications, and slightly different physical dimensions or markings. Both offer Class 10 protection in the 37-50A range.

The dial should be set to the motor's full load ampere (FLA) rating, which can be found on the motor's nameplate. Setting it higher can lead to motor damage, while setting it too low can cause nuisance tripping.

Yes, while it's designed for direct mounting on LC1-D contactors, it can also be mounted on a DIN rail using a separate terminal block adapter, such as the LA7D3064. This allows for flexible panel layouts.

Last Update: Friday, March 13, 2026

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