Description
The Schneider Electric TeSys LRD series are bimetal thermal overload relays designed to mount directly onto TeSys D (LC1D) contactors (and some LC1F with adapters) for motor circuit protection against overload, phase loss, and prolonged overcurrent. Listed models — LRD365C (65–80A range), LRD340C (40–50A), LRD350C (50–65A), LRD3357C (57–65A), LRD3359C (59–70A), LRD3361C (61–80A), LRD3363C (63–80A variant), and LRD4365 / LRD4367 (Class 10A, higher frame for LC1D80…D170 contactors) — provide a manual/auto reset, trip indication flag, and NO+NC auxiliary contacts for alarm/PLC signaling.
Key Features
- Mounting: Snap-on direct to TeSys D contactor (front/side per frame) — no wiring between contactor & OLR.
- Trip Class: Class 10A (trips in 10×In within 2–10 sec) standard; some LRD436x = Class 20/30 optionally.
- Setting Range: Dial-adjustable current setting (e.g., LRD365C = 65–80A).
- Auxiliary Contacts: 1 NO + 1 NC (early break / late make) for STOP circuit & alarm.
- Manual Test / Reset: Test button simulates trip; Reset = Manual or Auto (selectable).
- Certifications: IEC 60947-4-1, UL 508, CSA, CE, RoHS.
- Country of Origin: France / Morocco / China (Schneider global)
Model & Setting Range Table
Model | Fits Contactor Frame | Adjustable Range (A) | Typical Motor (400V AC-3) |
|---|---|---|---|
LRD340C | LC1D40…D65 | 40 – 50 A | ~18.5–22 kW |
LRD350C | LC1D50…D65 | 50 – 65 A | ~22–30 kW |
LRD3357C | LC1D50…D80 | 57 – 65 A | ~30 kW |
LRD3359C | LC1D63…D80 | 59 – 70 A | ~30–37 kW |
LRD3361C | LC1D80 | 61 – 80 A | ~37–45 kW |
LRD3363C | LC1D80 | 63 – 80 A (alt. cal.) | ~37–45 kW |
LRD365C | LC1D80…D95 | 65 – 80 A | ~37–45 kW |
LRD4365 | LC1D80…D170 (large frame) | 65 – 80 A (Class 10/20) | Large frame OLR |
LRD4367 | LC1D95…D170 (large frame) | 80 – 100 A (Class 10/20) | Large frame OLR |
⚠️ Critical Selection Rule:
Technical Specifications (Representative — LRD365C)
Parameter | Specification |
|---|---|
Model | LRD365C |
Series | TeSys LRD (Thermal Overload Relay) |
Mounting | Clip-on to LC1D80…D95 contactor (front mount) |
Current Setting Range | 65 – 80 A (adjustable dial) |
Trip Class | Class 10A (IEC 60947-4-1) |
Rated Insulation Voltage (Ui) | 690 V |
Auxiliary Contact | 1 NO + 1 NC (rated 5 A @ 240V AC) |
Reset Type | Manual / Automatic (selectable) |
Test Button | Yes (simulates trip condition) |
Phase Failure Sensitivity | Yes (trips on loss of 1 phase) |
Ambient Temp. Compensation | Yes (ambient compensated -20…+60°C) |
Dimensions (mm) | Matches LC1D80 footprint — W≈45, H≈97, D≈95 |
Weight | Approx. 0.33 kg |
Standards | IEC 60947-4-1, UL 508, CSA C22.2, CE, RoHS |
Warranty & After-Sales
- Factory new units: 12 months warranty
- Refurbished units: 3-6 months warranty
- Technical support for:
- Correct OLR selection per motor FLA & contactor frame
- Star-delta / reversing starter OLR sizing
- Wiring diagram (95-96 NC breaks coil circuit; 97-98 NO for alarm)
- Trip class selection (Class 10 vs 20/30 for hard-start / high inertia)
- Cross-reference vs. older LR1 / LR2 / 3UA series
Delivery Time
- Standard delivery: 3-5 working days (stock items)
- Express shipping available upon request
Why Choose Our Store
- Genuine Schneider Electric TeSys components
- Global supply network with competitive pricing
- Expertise in motor control centers, star-delta starters & soft-starter bypass panels
- Comprehensive technical documentation (setting tables, dimensional drawings, tripping curves)
- Responsive customer service and support
Applications
- Motor overload protection for pumps, fans, compressors, conveyors
- Star-delta (wye-delta) reduced voltage starters
- Reversing / Two-speed motor starters
- Industrial machines with LC1D contactor lineup
- Retrofit of older thermal relays (3UA, LR1-D) with modern TeSys LRD
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