Telemecanique LB1-LC03L Thermal Overload Relay

Description

The Telemecanique LB1-LC03L is a robust 3-pole thermal overload relay designed for reliable motor protection. It features an adjustable current setting range from 23 to 32 Amperes, making it suitable for a variety of industrial applications. This unit is engineered to protect AC motors against overloads, phase failures, and prolonged starting times. Its direct mounting capability on Telemecanique contactors ensures a compact and efficient assembly within control cabinets. As a legacy component, it is an ideal spare part for maintaining existing machinery.

Specifications

• Manufacturer: Telemecanique
• Model: LB1-LC03L
• Type: Thermal Overload Relay
• Number of Poles: 3
• Current Setting Range: 23 - 32 A
• Maximum Insulation Voltage (Ui): 660V AC
• Mounting Style: Direct Mount on Contactor

Label Info

• Brand: Telemecanique
• Part Number: LB1-LC03L
• Ui: 660V a.c. max.

Application

This thermal overload relay is commonly used in industrial control panels for motor control centers (MCCs), protecting motors for pumps, conveyors, fans, and other machinery from thermal damage due to overcurrent conditions.

Country of Origin

Made in France.

CO2 Impact

Opting for this pre-owned component avoids the production of a new one, saving an estimated 8.0 kg of CO2. This saving is equivalent to the emissions from driving a standard car for 40 kilometers.

Availability

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

FAQ

How do I correctly set the current on this LB1-LC03L relay?

The current should be set to the motor's full load ampere (FLA) rating, which is typically found on the motor's nameplate. Use the dial on the front of the relay to adjust the setting to match this value within the 23-32A range.

The LB1-LC03L relay is designed for direct mounting on older Telemecanique LC1-D series contactors, specifically models like the LC1-D25, LC1-D32, and LC1-D38 from that era. Always verify physical compatibility before installation.

Yes, this type of differential thermal overload relay is inherently sensitive to phase failure. In the event of a lost phase, the resulting current imbalance will cause the relay to trip faster than a standard overload, providing effective protection for the motor.

PLC2DAY is not an authorized distributor, reseller or representative of the products featured on this website. All product names, trademarks, brands and logos used on this site are the property of their respective owners.

Last Update: Friday, March 13, 2026