Product Description
TeSys LRD Thermal Overload Relay (LRD01)
The TeSys LRD differential thermal overload relay provides reliable protection for three-phase motors against overloads, phase failure, and unbalanced loads. With a thermal adjustment range of 0.63–1A, it’s designed for 0.25–0.37 kW (400V) motors.
It includes a thermal adjustment dial, manual/automatic reset selector, test button, and status indicator flag. Two auxiliary contacts (1NO + 1NC) are provided for fault signaling. The settings are secured by a transparent, sealable cover.
This relay connects directly to the bottom terminals of LC1D09–D38 contactors or can be mounted separately using a LAD7B106 terminal block (sold separately).
The TeSys LRD series meets international standards (IEC, UL, CSA, CCC, EAC, ATEX, Marine) and is Green Premium compliant (RoHS/REACH).
Specifications
Main
| Parameter | Details |
|---|---|
| Range | TeSys / TeSys Deca |
| Product Type | Differential Thermal Overload Relay |
| Device Short Name | LRD |
| Application | Motor Protection |
| Compatible Contactors | LC1D09, LC1D12, LC1D18, LC1D25, LC1D32, LC1D38 |
| Thermal Overload Class | Class 10A (IEC 60947-4-1) |
| Adjustment Range | 0.63 – 1A |
| Rated Insulation Voltage (Ui) | 690V (IEC), 600V (UL/CSA) |
Complementary
| Parameter | Details |
|---|---|
| Network Frequency | 0 – 400 Hz |
| Mounting Options | Under contactor, on plate, or DIN rail (with accessories) |
| Tripping Threshold | 1.14 ± 0.06 Ir (IEC 60947-4-1) |
| Auxiliary Contacts | 1 NO + 1 NC |
| Thermal Current (Ith) | 5A (signaling circuit) |
| Permissible Current | 3A at 120V AC-15, 0.22A at 125V DC-13 |
| Rated Operational Voltage (Ue) | 690V AC (IEC 60947-4-1) |
| Fuse Rating | 4A gG / 4A BS (signaling circuit) |
| Impulse Withstand Voltage (Uimp) | 6 kV |
| Phase Failure Sensitivity | Trips at 130% Ir on two phases, third phase at 0 |
| Control Type | Red (Stop), Blue (Reset) |
| Temperature Compensation | -20°C to +60°C |
Connections & Dimensions
| Parameter | Details |
|---|---|
| Control Circuit Terminals | Screw clamp, 1–2.5 mm² (solid/flexible) |
| Power Circuit Terminals | Screw clamp, 1–10 mm² (flexible/solid) |
| Tightening Torque | 1.7 N·m |
| Dimensions (H × W × D) | 66 × 45 × 70 mm |
| Net Weight | 0.124 kg |
Environment
| Parameter | Details |
|---|---|
| Protection Degree | IP20 (IEC 60529) |
| Operating Temperature | -20°C to +60°C |
| Storage Temperature | -60°C to +70°C |
| Flame Retardance | UL94 V1 |
| Vibration Resistance | 6 Gn (IEC 60068-2-6) |
| Shock Resistance | 15 Gn for 11 ms (IEC 60068-2-7) |
| Dielectric Strength | 1.89 kV (IEC 60947-1) |
| Compliance Standards | IEC, UL, CSA, CCC, EAC, BV, RINA, DNV-GL, LROS, ATEX INERIS, UKCA |
| Green Premium Label | Yes (RoHS/REACH Compliant) |
Packaging
| Package Type | Quantity | Dimensions (L×W×H) | Weight |
|---|---|---|---|
| Package 1 (PCE) | 1 Unit | 8.9 × 7.8 × 5 cm | 139 g |
| Package 2 (S02) | 24 Units | 40 × 30 × 15 cm | 3.767 kg |
| Package 3 (P06) | 384 Units | 60 × 80 × 80 cm | 68.388 kg |