The Schneider LRD08 is a thermal overload relay from the TeSys LRD series, designed to protect motors from overloads and phase loss. It operates within a 2.5 to 4A current range and follows the Class 10A tripping standard, ensuring quick and reliable motor protection.
2. Key Features
Brand: Schneider Electric
Series: TeSys LRD
Model: LRD08
Type: Thermal Overload Relay
Current Range: 2.5 – 4A
Trip Class: 10A
Phase Failure Protection: Yes
Reset Mode: Manual and Automatic
Mounting: Directly attaches to TeSys D contactors
Auxiliary Contacts: 1 NO + 1 NC
3. Benefits
Reliable Protection: Prevents motor damage due to overload or phase failure.
Fast Tripping Response: Class 10A ensures quick shutdown during faults.
Seamless Integration: Designed to work with TeSys D contactors for easy installation.
Compact & Efficient: Space-saving design for control panels.
Dual Reset Options: Offers both manual and automatic reset functionality.
4. Applications
Small Industrial Motors: Used in pumps, fans, and conveyors.
HVAC Systems: Protects motors in heating and cooling applications.
Automation Systems: Ensures safe operation of industrial machinery.
Water Treatment Plants: Prevents overheating in small motor-driven pumps.
5. Conclusion
The Schneider LRD08 TeSys LRD Thermal Overload Relay provides reliable, efficient, and quick protection for small motors operating in the 2.5-4A range. Its easy integration, compact design, and dependable performance make it an ideal choice for various industrial and commercial applications
Additional information
brands
Schneider Electric
Specifications
Main
Range
TeSys
TeSys Deca
Product name
TeSys LRD
TeSys Deca
Product or component type
Differential thermal overload relay
Device short name
LRD
Relay application
Motor protection
Product compatibility
LC1D12
LC1D09
LC1D25
LC1D38
LC1D32
LC1D18
Network type
AC
DC
Thermal overload class
Class 10A conforming to IEC 60947-4-1
Thermal protection adjustment range
2.5…4 A
[Ui] rated insulation voltage
Power circuit: 600 V conforming to CSA
Power circuit: 600 V conforming to UL
Power circuit: 690 V conforming to IEC 60947-4-1
Complementary
Network frequency
0...400 Hz
Mounting support
Plate, with specific accessories
Rail, with specific accessories
Under contactor
Tripping threshold
1.14 +/- 0.06 Ir conforming to IEC 60947-4-1
Auxiliary contact composition
1 NO + 1 NC
[Ith] conventional free air thermal current
5 A for signalling circuit
Permissible current
3 A at 120 V AC-15 for signalling circuit
0.22 A at 125 V DC-13 for signalling circuit
[Ue] rated operational voltage
690 V AC 0...400 Hz for power circuit conforming to IEC 60947-4-1
Associated fuse rating
4 A gG for signalling circuit
4 A BS for signalling circuit
[Uimp] rated impulse withstand voltage
6 kV
Phase failure sensitivity
Tripping current 130 % of Ir on two phase, the last one at 0
Control type
Red push-button: stop
Blue push-button: reset
Temperature compensation
-20…60 °C
Connections - terminals
Control circuit: screw clamp terminals 2 cable(s) 1…2.5 mm² flexible without cable end
Control circuit: screw clamp terminals 2 cable(s) 1…2.5 mm² flexible with cable end
Control circuit: screw clamp terminals 2 cable(s) 1…2.5 mm² solid without cable end
Power circuit: screw clamp terminals 1 cable(s) 1.5…10 mm² flexible without cable end
Power circuit: screw clamp terminals 1 cable(s) 1…4 mm² flexible with cable end
Power circuit: screw clamp terminals 1 cable(s) 1…6 mm² solid without cable end
Tightening torque
Control circuit: 1.7 N.m - on screw clamp terminals
Power circuit: 1.7 N.m - on screw clamp terminals
Height
66 mm
Width
45 mm
Depth
70 mm
Net weight
0.124 kg
Environment
Climatic withstand
conforming to IACS E10
IP degree of protection
IP20 conforming to IEC 60529
Ambient air temperature for operation
-20…60 °C without derating conforming to IEC 60947-4-1
Ambient air temperature for storage
-60…70 °C
Flame retardance
V1 conforming to UL 94
Mechanical robustness
Vibrations: 6 Gn conforming to IEC 60068-2-6
Shocks: 15 Gn for 11 ms conforming to IEC 60068-2-7
Dielectric strength
1.89 kV at 50 Hz conforming to IEC 60947-1
Standards
EN/IEC 60947-4-1
EN/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
Product certifications
IEC
UL
CSA
CCC
EAC
BV
RINA
DNV-GL
LROS (Lloyds register of shipping)
ATEX INERIS
UKCA
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