Schneider Electric LRD3355 Thermal Overload Relay

Description:

The Schneider Electric LRD3355 Thermal Overload Relay is used in motor control systems to provide adjustable overload and phase loss protection for three-phase motors and industrial drive applications. Commonly installed in motor control centers, conveyors, pumps, compressors, and manufacturing equipment utilizing TeSys D contactors. Maintenance teams, OEM machine builders, and system integrators use this relay for motor protection upgrades, replacement of failed overload devices, and industrial control panel retrofits.

Applications:

The LRD3355 thermal overload relay is commonly used in manufacturing plants, water treatment facilities, material handling systems, HVAC equipment, and process industries where motors require reliable protection against overload conditions and phase failure. Designed for use with Schneider Electric LC1D40 through LC1D65 contactors, the relay provides Class 10A tripping characteristics for industrial motors up to approximately 18.5 kW at 400V.

Technical Specifications:

• Manufacturer part number (MPN): LRD3355
• Manufacturer: Schneider Electric / Telemecanique
• Product type: Thermal overload relay
• Product series: TeSys Deca LRD
• Current adjustment range: 30 to 40 A
• Network frequency: 50/60 Hz
• Frequency range: 0 to 400 Hz
• Overload class: Class 10A
• Relay application: Motor protection
• Compatible contactors: LC1D40, LC1D50, LC1D65, LC1D80, and LC1D95
• Auxiliary contacts: 1 NO + 1 NC
• Rated insulation voltage (Ui): 1000 VAC
• Rated impulse withstand voltage (Uimp): 6 kV
• Reset type: Manual or automatic selectable
• Phase failure sensitivity: Yes
• Mounting type: Direct contactor mount, DIN rail, or panel mount
• Terminal type: Screw clamp terminals
• Protection functions: Overload, phase loss, and phase imbalance protection
• Operating temperature compensation: -20°C to +60°C
• Standards compliance: IEC 60947-4-1, UL, CSA
• Application: Three-phase motor protection systems

Common Replacements:

• Schneider Electric LRD3357 Thermal Overload Relay
• Schneider Electric LRD3363 Thermal Overload Relay
• Schneider Electric LR9F5367 Electronic Overload Relay