Schneider Electric LRD08 TeSys Deca Thermal Overload Relay 690VAC 3P 2.5-4A Class 10A
Schneider Electric LRD08 TeSys Deca Thermal Overload Relay 690VAC 3P 2.5-4A Class 10A
- MPN: LRD08
- PPN: SCH-LRD08
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CAD$124.05/ EA
Description
TeSys LRD thermal overload relay, 4A/690V, thermal setting range 2.5-4A, tripping class 10A, for protection of 3-phase motors 1.1-1.5kW@400V. Differential device with phase failure and load unbalance detection. It provides a thermal adjustement dial, a manual-automatic reset selector, a test selector for simulation of a tripping, reset and stop buttons, a flag indicator and 2 auxiliary contacts 1NO+1NC for fault signalling. Settings are protected by a transparent cover lockable by sealing. Connection by screw clamp terminals, it connects directly to the bottom terminals of 3-pole contactors LC1D09-D38. Mounting on DIN rail or screw fixing, separated from the contactor, with use of a terminal block LAD7B106 (to be ordered separately). Multi standards certified (IEC, UL, CSA, CCC, EAC, ATEX, Marine), Green Premium compliant (RoHs/Reach).
Features
- The LRD08 is a TeSys Deca (formerly TeSys D) differential thermal overload relay. Its primary job is to protect three-phase AC motors against overloads and phase failures. Unlike a fuse or breaker that handles short circuits, the LRD08 monitors the heat generated by the motor's current to prevent the windings from burning out during sustained heavy use.
- This model features an adjustable current setting range of 2.5 to 4 Amperes. You dial the blue arrow to match the Full Load Amps (FLA) listed on your motor's nameplate. It is a Class 10A device, meaning it will trip within 10 seconds or less when the current reaches 7.2 times the setting, providing a perfect balance for standard motor startups.
- The LRD08 is designed for "direct mounting" beneath Schneider TeSys Deca contactors, specifically models LC1D09 through LC1D38. It plugs directly into the bottom of the contactor, creating a compact, integrated motor starter assembly. It can also be mounted independently on a DIN rail if used with a separate terminal block (LAD7B106).
- This is a differential relay, meaning it is highly sensitive to phase imbalance. If one of the three phases loses power or drops significantly in voltage, the LRD08 will trip much faster than a standard thermal relay. This is critical for preventing "single-phasing," which is a leading cause of industrial motor failure.
- The unit includes integrated auxiliary contacts (1 NO + 1 NC) used to signal a fault or cut power to the contactor coil. It features a multi-function red "Stop" button and a blue "Reset" selector that can be set to: Manual (H): Requires a human to press the button to restart. Automatic (A): Resets itself once the internal bi-metallic strips cool down.
Specifications
- Rated Operational Voltage
- 690 V AC 0...400 Hz power circuit IEC 60947-4-1
- Motor Power Rating
- 1.1-1.5 kW @ 400 V
- Network Frequency
- 0...400 Hz
- Thermal Overload Class
- Class 10A IEC 60947-4-1
- Tripping Threshold
- 1.14 +/- 0.06 Ir IEC 60947-4-1
- Permissible Signalling Current
- 3 A 120 V AC-15; 0.22 A 125 V DC-13 signalling circuit
- Temperature Compensation
- -20 to 60 b0C
- Control Type
- red push-button stop; blue push-button reset
- Net Weight
- 0.124 kg
- Flame Retardance
- V1 UL 94
- Dielectric Strength
- 1.89 kV 50 Hz IEC 60947-1
- Product Certifications
- IEC; UL; CSA; CCC; EAC; BV; RINA; DNV GL; Lloyds Register; ATEX; INERIS; UKCA
Phase3-Phase
Rated Insulation Voltagepower circuit 600 V CSA; 600 V UL; 690 V IEC 60947-4-1
Thermal Protection Adjustment Range2.5-4 A
Auxiliary Contacts1 NO + 1 NC
Conventional Free Air Thermal Current5 A signalling circuit
Rated Impulse Withstand Voltage6 kV
Mounting Supportplate, with specific accessories; rail, with specific accessories; under contactor
Dimensions (H x W x D)66 mm x 45 mm x 70 mm
Ingress ProtectionIP20 IEC 60529
Mechanical Robustness6 Gn vibration IEC 60068-2-6; 15 Gn shock for 11 ms IEC 60068-2-7
StandardsIEC 60947-4-1; IEC 60947-5-1; UL 60947-4-1; UL 60947-5-1; CSA C22.2 No 60947-4-1; CSA C22.2 No 60947-5-1; GB/T 14048.4; GB/T 14048.5; EN 50495
Country of OriginFrance
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CAD$124.05/ EA
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