Schneider Electric LRD350 TeSys Deca Thermal Overload Relay 37-50A 690VAC Class 10A
Schneider Electric LRD350 TeSys Deca Thermal Overload Relay 37-50A 690VAC Class 10A
- MPN: LRD350
- PPN: SCH-LRD350
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CAD$255.68/ EA
Description
TeSys LRD thermal overload relay, 50A/690V, thermal setting range 37-50A, tripping class 10A, for protection of 3-phase motors 22kW@400V. Differential device with phase failure and load unbalance detection. It provides a thermal adjustement dial, a manual-automatic reset selector, a test selector for simulation of a tripping, reset and stop buttons, a flag indicator and 2 auxiliary contacts 1NO+1NC for fault signalling. Settings are protected by a transparent cover lockable by sealing. Connection by EverLink BTR screw terminals , it connects directly to the bottom terminals of 3-pole contactors LC1D40A-D80A. Mounting on DIN rail or screw fixing, separated from the contactor, with use of a terminal block LAD96560 (to be ordered separately). Multi standards certified (IEC, UL, CSA, CCC, EAC, Marine), Green Premium compliant (RoHs/Reach).
Features
- Specifically engineered for seamless plug-and-play mounting beneath TeSys Deca and TeSys D contactors (models LC1D40A through LC1D65A), this thermal overload relay creates a compact, high-integrity motor starter assembly. By utilizing a direct-connect design, you eliminate additional wiring labor and reduce the overall footprint within your industrial control panel.
- Featuring a precision-calibrated adjustment dial, this relay allows you to fine-tune the protection threshold between 37 and 50 Amps to match your motor's full load amperage (FLA). This granular control prevents premature motor burnout due to subtle overloads while simultaneously reducing nuisance tripping, ensuring your 3-phase pumps, fans, or conveyors operate at peak efficiency.
- Built with advanced differential tripping technology, this relay monitors for phase unbalance or the total loss of a single phase—a common cause of rapid motor overheating and catastrophic failure. This proactive sensing mechanism instantly disconnects the motor during a phase fault, saving you thousands of dollars in rewinding costs and preventing unplanned production downtime.
- Equipped with a versatile blue reset button and a dedicated red stop/test button, this unit allows maintenance teams to choose between manual reset for critical fault investigation or automatic reset for remote applications. The visible trip indicator and built-in NO+NC auxiliary contacts provide immediate feedback to your PLC or alarm system, allowing for rapid diagnostics and a safer return to operation after an overcurrent event.
- Fully compliant with international standards including UL 508, CSA C22.2, and IEC 60947-4-1, this TeSys LRD relay is suitable for use in demanding global markets. Whether you are building panels for a domestic manufacturing plant or exporting machinery overseas, this certified protection ensures your equipment meets all mandatory safety regulations and electrical codes for motor branch circuit protection.
Specifications
- Rated current
- 50 A
- Thermal overload class
- Class 10A IEC 60947-4-1
- Rated operational voltage
- 690 V AC 0-400 Hz power circuit IEC 60947-4-1
- Thermal current (Ith)
- 5 A signalling circuit
- Rated impulse withstand voltage
- 6 kV
- Connection type
- Power circuit EverLink BTR screw connectors 1 1-35 mm² flexible/solid, control circuit screw clamp terminals 2 1-2.5 mm² flexible/solid
- Dimensions (H x W x D)
- 70 mm x 55 mm x 123 mm (2.76 in x 2.17 in x 4.84 in)
- Operating ambient temperature
- -20 to 60 °C (-4 to 140 °F) without derating IEC 60947-4-1
- Ingress protection rating
- IP20 IEC 60529
- Compliance
- IEC, UL, CSA, CCC, EAC, Marine, RoHS, REACH, EU RoHS Compliant, China RoHS Regulation (Pro-active declaration)
- Ambient Air Temperature For Operation
- -20 to 60 °C without derating IEC 60947-4-1
- Associated fuse rating
- 4 A gG or 4 A BS for signalling circuit
- Mechanical robustness
- Shocks 15 Gn for 11 ms IEC 60068-2-7, vibrations 4 Gn IEC 60068-2-6
- Product compatibility
- LC1D65A, LC1D50A, LC1D40A
- Relay application
- Motor protection
- Circularity profile
- ENVEOLI0804005_V1
- Toxic heavy metal free
- Yes
- Reach free of SVHC
- Yes, free of substances of very high concern above threshold
Thermal setting range37-50 A
Motor power rating22 kW @ 400 V
Tripping threshold1.14 ± 0.06 Ir IEC 60947-4-1
Permissible current0.95 A 380 V AC-15 signalling circuit, 0.06 A 440 V DC-13 signalling circuit
Network frequency0-400 Hz
Mounting typeDIN rail, plate, or under contactor with specific accessories
Net weight0.375 kg (0.83 lb)
Storage ambient temperature-60 to 70 °C (-76 to 158 °F)
StandardsIEC 60947-4-1, 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
Flame retardanceV1 UL 94
Phase failure sensitivityTripping current 130% of Ir on two phase, last phase at 0
Tightening torqueControl circuit 1.7 N·m screw clamp terminals, power circuit 5 N·m EverLink BTR screw connectors
Device typeDifferential thermal overload relay
Product certificationsIEC, UL, CSA, CCC, EAC, DNV-GL, RMRS, EU-RO MR, LROS (Lloyd's Register of Shipping), ATEX INERIS, UKCA
Control typeRed push-button stop, blue push-button reset
Warranty18 months
Mercury freeYes
Sustainable offer statusGreen Premium product
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