Square D TeSys Deca Thermal Overload Relay
The Square D LRD05 is a TeSys Deca differential thermal overload relay designed for direct mounting to TeSys Deca contactors. It provides motor overload protection for 1/4 HP motors with a 0.63–1A thermal range and Class 10A tripping action, along with phase unbalance protection to detect wiring faults and motor imbalance conditions. Screw clamp control circuit terminals simplify field wiring, and the relay is certified to EN/IEC 60947-4-1, UL 60947-4-1, CSA C22.2 No. 60947-4-1, and GB/T 14048.4/14048.5 standards.
Key Specifications
| Attribute | Value |
|---|---|
| Manufacturer | Square D (Schneider Electric) |
| Model | LRD05 |
| Series | TeSys Deca |
| Type | Differential Thermal Overload Relay |
| Trip Range | 0.63–1A |
| Tripping Class | Class 10A |
| Phase Unbalance Protection | Yes |
| Connection Type | Control Circuit Screw Clamp Terminals |
| Standards | EN/IEC 60947-4-1, UL 60947-4-1, CSA C22.2 No 60947-4-1, GB/T 14048.4, GB/T 14048.5, EN 50495 |
Applications
- Small motor overload protection (1/4 HP)
- Industrial machinery motor starter assemblies
- HVAC and pump motor protection
- Control panel motor branch circuit protection








