SCHNEIDER ELECTRIC LB1 LC03M10

Schneider Electric (Telemecanique) Thermal Overload Relay 4-6.3A

Description

The LB1 LC03M10 is a robust thermal overload relay from Telemecanique, designed to provide essential protection for three-phase motors. It offers a manually adjustable current setting from 4 to 6.3 Amperes, ensuring precise protection against overcurrents and phase failures. This unit is specifically engineered for direct mounting on Telemecanique LC and LD series contactors, making it an ideal replacement part for existing control panels.

Specifications

• Manufacturer: Schneider Electric (Telemecanique)
• Model: LB1 LC03M10
• Type: Thermal Overload Relay
• Adjustable Current Range: 4 – 6.3 A
• Maximum Insulation Voltage (Ui): 690V AC
• Poles: 3-Pole
• Mounting Style: Direct Mount on Contactor

Label Info

• Brand: Telemecanique
• Part Number: LB1 LC03M10
• Standard: IEC 947-6-2
• Approvals: UL, CSA (SP)

Application

This relay is used in industrial motor control applications to protect motors from damage due to overloads or phase loss. It is commonly found in control cabinets for conveyors, pumps, fans, and other machinery powered by three-phase AC motors.

Country of Origin

Made in France.

CO2 Impact

By choosing this refurbished component, you are helping to avoid approximately 6.0 kg of CO2 emissions associated with the production of a new one. This choice supports sustainable industrial practices.

Availability

This is an obsolete item, but it is available from our stock. Order now from spareparts2day for expert support and fast delivery.

FAQ

Which contactors is the LB1 LC03M10 compatible with?

This thermal overload relay is designed for direct mounting on Telemecanique (now Schneider Electric) contactors from the LD and LC series, specifically models like LC1D09, LC1D12, LC1D18, LC1D25, LC1D32, and LC1D38.

How do I set the trip current on this relay?

The trip current is set using the two dials on the top face of the unit. The right dial sets the full motor load current in Amperes (from 4 to 6.3A), and the left dial is for differential setting, providing protection against phase loss. Always set the current according to the motor’s nameplate Full Load Amp (FLA) rating.

Is this model still available from Schneider Electric? What is the modern replacement?

The LB1 LC03M.. series is obsolete and no longer in production. The modern equivalent from Schneider Electric is the TeSys LRD series, specifically the model LRD10, which covers the same 4-6.3A current range and offers similar functionality.

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Last Update: Friday, March 13, 2026