Description

Schneider LRD3361 | TeSys LRD thermal overload relays – 55…70 A – class 10A

1. Introduction

The Schneider LRD3361 is a thermal overload relay from the TeSys LRD series, designed to provide protection against overloads and phase failure in electrical motor circuits. With an adjustable current range of 55-70A and Class 10A tripping characteristics, this relay ensures reliable motor protection and optimal system performance. It is typically used in combination with TeSys LC1D contactors for seamless integration into motor control panels.

2. Key Features

  • Adjustable Current Range: 55-70A
  • Tripping Class: 10A
  • Reset Options: Manual and automatic reset
  • Phase Failure Protection: Helps prevent damage due to phase loss
  • Mounting Compatibility: Directly mounts on TeSys LC1D contactors
  • Auxiliary Contacts: 1 normally open (NO) + 1 normally closed (NC)
  • Compact and Durable: Designed for industrial environments

3. Technical Specifications

  • Product Type: Thermal Overload Relay
  • Series: TeSys LRD
  • Current Adjustment Range: 55-70A
  • Tripping Class: 10A
  • Reset Mode: Manual/Automatic
  • Phase Failure Protection: Yes
  • Number of Auxiliary Contacts: 1 NO + 1 NC
  • Mounting Type: Direct attachment to LC1D contactors
  • Compliance: IEC 60947-4-1

4. Applications

  • Motor overload protection
  • Industrial automation systems
  • Pumps, fans, compressors, conveyors
  • HVAC systems
  • Power distribution panels

5. Benefits

  • Reliable Motor Protection: Prevents overheating and damage
  • Easy Integration: Mounts directly onto LC1D contactors
  • Versatile Reset Options: Adaptable to different control requirements
  • Compact Design: Saves space in control panels
  • Energy-Efficient: Reduces downtime and maintenance costs

6. Conclusion

The Schneider LRD3361 is a high-performance thermal overload relay that ensures efficient and reliable motor protection in industrial and commercial applications. With its adjustable 55-70A range, Class 10A tripping characteristics, and built-in phase failure protection, it is an ideal choice for preventing motor damage and enhancing system safety

Additional information

brands

Schneider Electric

Specifications

Main
Range TeSys
Product name TeSys LRD TeSys Deca
Product or component type Differential thermal overload relay
Device short name LRD
Relay application Motor protection
Product compatibility LC1D95 LC1D80
Network type DC AC
Thermal overload class Class 10A conforming to IEC 60947-4-1
Thermal protection adjustment range 55…70 A
[Ui] rated insulation voltage Power circuit: 1000 V conforming to IEC 60947-4-1 Power circuit: 600 V conforming to CSA Power circuit: 600 V conforming to UL
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 0.72 A at 500 V AC-15 for signalling circuit 0.06 A at 440 V DC-13 for signalling circuit
[Ue] rated operational voltage 1000 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 conforming to IEC 60947-1
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 Power circuit: screw clamp terminals 1 cable(s) 4…35 mm² flexible without cable end Power circuit: screw clamp terminals 1 cable(s) 4…35 mm² flexible with cable end Power circuit: screw clamp terminals 1 cable(s) 4…35 mm² solid without cable end 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
Tightening torque Control circuit: 1.7 N.m - on screw clamp terminals Power circuit: 9 N.m - on screw clamp terminals
Height 81 mm
Width 70 mm
Depth 115 mm
Net weight 0.51 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 2.2 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 ATEX INERIS UKCA
Packing Units
Unit Type of Package 1 PCE
Number of Units in Package 1 1
Package 1 Height 8.000 cm
Package 1 Width 11.900 cm
Package 1 Length 8.600 cm
Package 1 Weight 506.000 g
Unit Type of Package 2 S02
Number of Units in Package 2 12
Package 2 Height 15.000 cm
Package 2 Width 30.000 cm
Package 2 Length 40.000 cm
Package 2 Weight 6.450 kg
Unit Type of Package 3 P06
Number of Units in Package 3 192
Package 3 Height 75.000 cm
Package 3 Width 60.000 cm
Package 3 Length 80.000 cm
Package 3 Weight 113.700 kg
Contractual warranty
Warranty 18 months

Main documents

Main documents

Datasheet Download Datasheet
Product datasheet LRD3361
Instruction sheet
Download
Catalogue
Download
CAD Files
Download
Environmental disclosure Download

Main documents

Datasheet Download Datasheet
Product datasheet LRD3361
Instruction sheet
Download
Catalogue
Download
CAD Files
Download
Environmental disclosure Download

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