Telemecanique (Schneider Electric) Thermal Overload Relay 45-63A

Description

The Telemecanique LB1-LD03M61 is a 3-pole thermal overload relay designed for the protection of AC motors. It provides reliable protection against overloads and phase failure. This unit is designed for direct mounting onto Telemecanique LD series contactors, forming a compact and efficient motor starter. With an adjustable current range, it can be precisely set to match the motor's full load current, ensuring optimal performance and safety.

Specifications

• Manufacturer: Telemecanique (Schneider Electric)
• Type: LB1-LD03M61
• Product Type: Thermal Overload Relay
• Number of Poles: 3
• Current Setting Range: 45 A to 63 A
• Rated Insulation Voltage (Ui): 660V AC max.
• Mounting Style: Direct mount on LD contactors
• Reset: Manual / Automatic selection

Label Info

• Model: LB1-LD03M..
• Specific Model: LB1 LD03M61 (on dial)
• Certifications: UL Listed 170M, CSA (SP)

Application

This thermal overload relay is ideal for use in various industrial applications including conveyor systems, pumps, fans, and other machinery where motor protection is critical. Its direct mounting capability makes it suitable for control panel builders and maintenance professionals looking for a direct replacement for existing LD series starters.

Country of Origin

This product was manufactured in France.

CO2 Impact

By purchasing this reused Telemecanique relay, you help avoid the emission of approximately 12.0 kg of CO2. This saving is comparable to the emissions from driving a car for 60 kilometers.

Availability

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

FAQ

This thermal overload relay is specifically designed for direct mounting on Telemecanique LD series contactors, such as the LD1-LD... and LD4-LD... models. It is not directly compatible with the modern TeSys D series without an adapter plate.

The current setting is adjusted using the blue dial on the front of the unit, marked with "I>". You can use a small flat-head screwdriver to turn the dial to your motor's specific full-load ampere rating, within the 45A to 63A range of this device.

Yes, it can be used for single-phase applications. To do so, you must wire the current through all three poles in series to ensure proper and balanced heating of the bimetallic strips, which is critical for accurate tripping. Refer to the manufacturer's wiring diagrams for correct single-phase connection.

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Last Update: Friday, March 13, 2026