The Schneider LRD350 is a differential thermal overload relay from the TeSys Deca range, sized for motor protection in the 37–50 A band. Trips on a Class 10A curve (per IEC 60947-4-1), with phase-failure sensitivity tripping at 130% of Ir on two phases and zero on the third. Auxiliary contact composition is 1 NO + 1 NC, rated for signaling circuits up to 0.95 A at 380 V AC-15 or 0.06 A at 440 V DC-13. Mounting options include plate, rail (with accessories), or direct under the contactor. Power terminals use EverLink BTR screw connectors accepting 1–35 mm² conductors. Flame retardance is V1 (UL 94), dielectric strength 1.89 kV at 50 Hz, and impulse withstand 6 kV.
Schneider LRD350 Thermal Overload Relay, 37-50A, Class 10A
MPNLRD350
Active
Schneider Electric TeSys Deca LRD350, differential thermal overload relay, 37–50 A adjustment range, Class 10A.
$53.34Ref. 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 600 V CSA Power circuit 600 V UL Power circuit 690 V IEC 60947-4-1 |
| [Ue] rated operational voltage | 690 V AC 0...400 Hz power circuit IEC 60947-4-1 |
| [Uimp] rated impulse withstand voltage | 6 kV |
| Permissible current | 0.95 A 380 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 | 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 Power circuit EverLink BTR screw connectors 1 0.002...0.05 in² (1...35 mm²) flexible without cable end Power circuit EverLink BTR screw connectors 1 0.002...0.05 in² (1...35 mm²) flexible with cable end Power circuit EverLink BTR screw connectors 1 0.002...0.05 in² (1...35 mm²) solid without cable end |
| Depth | 4.8 in (123 mm) |
| Width | 2.2 in (55 mm) |
| Height | 2.8 in (70 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 EN 50495 |
| Range | TeSys TeSys Deca |
| 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 44.3 lbf.in (5 N.m) EverLink BTR screw connectors |
| Tripping threshold | 1.14 +/- 0.06 Ir IEC 60947-4-1 |
| Dielectric strength | 1.89 kV 50 Hz IEC 60947-1 |
| Mechanical robustness | Shocks15 Gn for 11 ms IEC 60068-2-7 Vibrations4 gn IEC 60068-2-6 |
| 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 are the key ratings of the LRD350?
Thermal protection adjustment range 37–50 A, Class 10A, 1 NO + 1 NC auxiliary contacts. Rated insulation voltage 690 V IEC, impulse withstand 6 kV.
What compliance standards does the LRD350 meet?
It complies with 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, and EN 50495.
MPN
LRD350