Schneider Electric TeSys Deca LR3D3557, non-differential thermal overload relay, 37-50 A adjustment range, Class 20, for motor protection.
| Parameter | Value |
|---|---|
| Control type | Red push-button stop Blue push-button reset |
| Network type | AC DC |
| Product or component type | Non differential thermal overload relay |
| Climatic withstand | IACS E10 |
| Voltage | Power circuit 1000 V IEC 60947-4-1 Power circuit 600 V CSA Power circuit 600 V UL |
| [Ue] rated operational voltage | 690 V AC 0...400 Hz power circuit IEC 60947-4-1 |
| [Uimp] rated impulse withstand voltage | 6 kV IEC 60947-1 |
| [Ith] conventional free air thermal current | 5 A signalling circuit |
| Network frequency | 0...400 Hz |
| Phase failure sensitivity | Tripping current 130 % of Ir on two phase, the last one at 0 |
| IP degree of protection | IP20 conforming to IEC 60529 |
| Mounting support | Plate, with specific accessories Rail, with specific accessories Under contactor |
| Parameter | Value |
|---|---|
| Connections - terminals | Power circuit screw clamp terminals 1 0.006...0.05 in² (4...35 mm²) flexible without cable end Power circuit screw clamp terminals 1 0.006...0.05 in² (4...35 mm²) flexible with cable end Power circuit screw clamp terminals 1 0.006...0.05 in² (4...35 mm²) solid without cable end Control circuit screw clamp terminals 2 0.002...0.004 in² (1...2.5 mm²) flexible without cable end Control circuit screw clamp terminals 2 0.002...0.004 in² (1...2.5 mm²) flexible with cable end Control circuit screw clamp terminals 2 0.002...0.004 in² (1...2.5 mm²) solid without cable end |
| Depth | 4.8 in (121 mm) |
| Width | 3.0 in (75 mm) |
| 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 |
| Range | TeSys |
| Category | US10I1222347 |
| Flame retardance | V1 conforming to UL 94 |
| Device short name | LR3D |
| Relay application | Motor protection |
| Tightening torque | Control circuit 15.05 lbf.in (1.7 N.m) screw clamp terminals Power circuit 79.7 lbf.in (9 N.m) screw clamp terminals |
| Tripping threshold | 1.14 +/- 0.06 Ir IEC 60947-4-1 |
| Dielectric strength | 1.89 kV 50 Hz IEC 60947-1 |
| Mechanical robustness | Vibrations6 Gn IEC 60068-2-6 Shocks15 Gn for 11 ms IEC 60068-2-7 |
| Associated fuse rating | 4 A gG for signalling circuit 4 A BS for signalling circuit |
| Thermal overload class | Class 20 IEC 60947-4-1 |
| Temperature compensation | -4...140 °F (-20...60 °C) |
| Auxiliary contact composition | 1 NO + 1 NC |
| Ambient air temperature for storage | -76...158 °F (-60...70 °C) |
| Thermal protection adjustment range | 37...50 A |
| Ambient air temperature for operation | -4...140 °F (-20...60 °C) without derating IEC 60947-4-1 |
The LR3D3557: Mounts directly under a TeSys contactor, or on a plate or rail with specific accessories. Screw-clamp terminals throughout; tightening torque is 9 N·m on the power side and 1.7 N·m on the control side. IP20 degree of protection allows use inside standard enclosures; flame retardance V1 per UL 94.
Certified to IEC 60947-4-1, IEC 60947-5-1, UL 60947-4-1, UL 60947-5-1, CSA C22.2 No 60947-4-1 and 60947-5-1, plus GB/T equivalents. Rated insulation voltage 1000 V IEC, 600 V UL/CSA.
The relay adjusts from 37 to 50 A, with a Class 20 tripping characteristic per IEC 60947-4-1.