Schneider LRD03 TeSys Deca Thermal Overload Relay 0.25-0.4A

The Schneider Electric LRD03 is a TeSys LRD differential thermal overload relay designed for motor protection, with a thermal overload setting range of 0.25 to 0.4 A and tripping class 10A per IEC 60947-4-1. Compatible with TeSys D contactors LC1D09 through LC1D38, it protects AC and DC motors against overload and phase loss on networks up to 690 V.

Technical specifications:

• Commercial reference: LRD03
• Manufacturer: Schneider Electric
• EAN:
• Series / range: TeSys LRD, TeSys Deca
• Product type: Differential thermal overload relay
• Relay function: Motor protection
• Thermal overload setting: 0.25...0.4 A
• Tripping class: Class 10A per IEC 60947-4-1
• Network type: AC / DC
• Network frequency: 0...400 Hz
• Tripping threshold: 1.14 +/- 0.06 Ir per IEC 60947-4-1
• Phase loss sensitivity: Tripping at 130% of Ir on two phases, last phase at 0
• Rated insulation voltage [Ui]: 690 V per IEC 60947-4-1; 600 V per UL / CSA
• Rated voltage [Ue]: 690 V AC, 0...400 Hz per IEC 60947-4-1
• Rated impulse withstand voltage [Uimp]: 6 kV
• Dielectric strength: 1.89 kV at 50 Hz per IEC 60947-1
• Auxiliary contacts: 1 NO + 1 NC
• Thermal current [Ith]: 5 A (control circuit)
• Permissible current: 3 A at 120 V AC-15; 0.22 A at 125 V DC-13 (control circuit)
• Associated fuse: 4 A gG / 4 A BS (control circuit)
• Connection - power circuit: screw terminals, 1.5...10 mm² flexible / 1...4 mm² flexible with ferrule / 1...6 mm² solid
• Connection - control circuit: screw terminals, 1...2.5 mm² flexible or solid
• Tightening torque: 1.7 N.m (power and control circuits)
• Mounting: Below contactor; DIN rail or panel with accessories
• Temperature compensation: -20...60°C
• IP protection: IP20 per IEC 60529
• Operating temperature: -20...60°C per IEC 60947-4-1
• Storage temperature: -60...70°C
• Flame resistance: V1 per UL 94
• Mechanical robustness: Vibrations 6 Gn per IEC 60068-2-6; Shocks 15 Gn for 11 ms per IEC 60068-2-7
• Dimensions (W x H x D): 45 x 66 x 70 mm
• Weight: 0.124 kg
• Compatible contactors: LC1D09, LC1D12, LC1D18, LC1D25, LC1D32, LC1D38
• Certifications: IEC, UL, CSA, CCC, EAC, BV, RINA, DNV-GL, LROS, ATEX INERIS, UKCA

Features and benefits:

• Class 10A tripping characteristic provides reliable overload protection for standard AC and DC motor applications
• Phase loss detection activates at 130% of rated current on two phases, preventing single-phase motor damage
• Integrated 1 NO + 1 NC auxiliary contact enables signaling, interlocking, and remote monitoring in control circuits
• Red stop and blue reset push buttons allow direct manual control and fault reset at the relay
• Wide temperature compensation range (-20 to 60°C) maintains consistent tripping behavior across demanding environments
• Direct mounting below TeSys D contactors simplifies wiring and reduces overall panel footprint

Applications:

• Motor starter assemblies for industrial machinery, conveyors, and pumps requiring thermal overload protection
• HVAC fan and pump motor control panels built around TeSys D contactor starters
• Machine tool control panels where thermal overload and phase-loss protection is required
• Marine and offshore motor control applications (certified by DNV-GL, BV, and RINA)
• Hazardous area motor starters requiring ATEX INERIS certification

Compliant with EN/IEC 60947-4-1, EN/IEC 60947-5-1, UL 60947-4-1, CSA C22.2 No 60947-4-1, GB/T 14048.4, GB/T 14048.5, and EN 50495. Part of the Schneider Electric TeSys Deca range.

Also known as: Schneider LRD03, Schneider Electric LRD03, TeSys thermal overload relay, motor protection relay 0.25-0.4A.