The Schneider Electric LRD3357 is a differential thermal overload relay from the TeSys Deca range, sized for motor protection with an adjustment range of 37–50 A and thermal overload class 10A. It mounts directly under the LC1D80 and LC1D95 contactor frames.
Schneider Electric LRD3357 Thermal Overload Relay, 37-50A, C
MPNLRD3357
Active
Schneider Electric TeSys Deca LRD3357 differential thermal overload relay, 37-50 A, Class 10A.
$49.53Ref. price · indicative, final on quote
StockContact for availability
MOQ1 pcs
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026
How we verify every order →Specifications
| Parameter | Value |
|---|---|
| Control type | Red push-button stop Blue push-button reset |
| Network type | DC AC |
| Product or component type | 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 | 1000 V AC 0...400 Hz power circuit IEC 60947-4-1 |
| [Uimp] rated impulse withstand voltage | 6 kV IEC 60947-1 |
| Permissible current | 0.72 A 500 V AC-15 signalling circuit 0.06 A 440 V DC-13 signalling circuit |
| [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 |
All specifications
| Parameter | Value |
|---|---|
| Mounting support | Plate, with specific accessories Rail, with specific accessories Under contactor |
| 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 | 4.5 in (115 mm) |
| Width | 2.8 in (70 mm) |
| Height | 3.2 in (81 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 EN 50495 |
| Range | TeSys |
| Category | US10I1222347 |
| Flame retardance | V1 conforming to UL 94 |
| Device short name | LRD |
| 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 | 2.2 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 10A 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 |
Product details
Frequently asked questions
What compliance documentation does Schneider provide for the LRD3357?
The relay meets 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, and EN 50495. Full declarations are available.
What is the adjustment range of the LRD3357?
The thermal protection adjustment range is 37–50 A.
MPN
LRD3357