Schneider Electric LRD3357 TeSys Deca Thermal Overload Relay 37-50A Class 10A
Schneider Electric LRD3357 TeSys Deca Thermal Overload Relay 37-50A Class 10A
- MPN: LRD3357
- PPN: SCH-LRD3357
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CAD$255.68/ EA
Description
TeSys LRD thermal overload relay, 50A/1000V, 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 acting also as reset button, a trip test button for simulation of a tripping, a stop button, a flag indicator and 2 auxiliary contacts 1NO+1NC for fault signalling. Settings are protected by a transparent cover lockable by sealing. Connection by screw clamp terminals, it connects directly to the bottom terminals of 3-pole contactors LC1D80-D95. Mounting on DIN rail or screw fixing, separated from the contactor, with use of a terminal block LA7D3064 (to be ordered separately). Multi standards certified (IEC, UL, CSA, CCC, EAC, ATEX, Marine), Green Premium compliant (RoHs/Reach).
Features
- Engineered for seamless direct mounting to Schneider Electric TeSys D contactors (specifically LC1D80 and LC1D95), this thermal overload relay creates a compact, integrated motor starter assembly. This plug-and-play design eliminates the need for extra wiring or DIN-rail adapters, saving valuable panel space and reducing labor time during installation or maintenance.
- Featuring a high-visibility adjustment dial, this relay allows for fine-tuned current settings between 37A and 50A to match your specific motor’s Full Load Amps (FLA). This precision prevents nuisance tripping while ensuring the relay reacts instantly to overloads, effectively shielding your heavy-duty motors from overheating and costly winding failure.
- Built with advanced differential tripping technology, the LRD3357 detects phase unbalance and phase loss in real-time. This critical protection layer automatically disconnects the motor if one phase fails, preventing the rapid heat buildup and catastrophic motor burnout that typically occurs when industrial equipment tries to run on unbalanced power.
- Equipped with a versatile blue reset button, the device allows for a choice between manual reset—forcing a technician inspection—or automatic reset for remote applications. The integrated red stop/test button allows you to manually verify the internal tripping mechanism and auxiliary contacts (1 NO + 1 NC) without a fault, ensuring your safety circuit is fully operational before the line goes live.
- Utilizing Schneider’s patented EverLink screw technology, the power connections maintain constant pressure on the cables even as the copper creeps or vibrates over time. This eliminates the need for periodic re-tightening and prevents hot spots at 600V, ensuring your 3-phase industrial power distribution remains stable and fire-safe in high-vibration manufacturing environments.
Specifications
- Amperage
- 37-50 A
- Voltage
- 1000 V AC 0-400 Hz power circuit IEC 60947-4-1
- Auxiliary Contact Composition
- 1 NO + 1 NC
- Permissible Current
- 0.72 A 500 V AC-15, 0.06 A 440 V DC-13 signalling circuit
- Rated Impulse Withstand Voltage
- 6 kV IEC 60947-1
- Control Type
- Red push-button stop, Blue push-button reset
- Network Type
- AC, DC
- Connections - Terminals
- Power circuit screw clamp terminals 1 4-35 mm² flexible/solid, with or without cable end; Control circuit screw clamp terminals 2 1-2.5 mm² flexible/solid, with or without cable end
- Height
- 81 mm (3.19 in)
- Depth
- 115 mm (4.53 in)
- Thermal Compensation
- -20 to 60 °C (-4 to 140 °F)
- Ambient Air Temperature for Storage
- -60 to 70 °C (-76 to 158 °F)
- Dielectric Strength
- 2.2 kV 50 Hz IEC 60947-1
- Flame Retardance
- V1 UL 94
- Product Certifications
- IEC, UL, CSA, CCC, EAC, ATEX, INERIS, UKCA
- REACH Compliance
- Free of SVHC
- Toxic Heavy Metal Free
- Yes
- Warranty
- 18 months
Thermal Overload ClassClass 10A IEC 60947-4-1
Tripping Threshold1.14 ± 0.06 Ir IEC 60947-4-1
Conventional Free Air Thermal Current5 A signalling circuit
Associated Fuse Rating4 A gG, 4 A BS signalling circuit
Phase Failure SensitivityTripping current 130% of Ir on two phases, last phase at 0
Thermal Protection Adjustment Range37-50 A
Network Frequency0-400 Hz
Tightening TorqueControl circuit 1.7 N·m, Power circuit 9 N·m screw clamp terminals
Width70 mm (2.76 in)
Net Weight0.51 kg (1.12 lb)
Ambient Air Temperature for Operation-20 to 60 °C (-4 to 140 °F) without derating IEC 60947-4-1
Mechanical RobustnessVibrations 6 Gn IEC 60068-2-6, Shocks 15 Gn for 11 ms IEC 60068-2-7
IP Degree of ProtectionIP20 IEC 60529
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, GB/T 14048.4, GB/T 14048.5, EN 50495
Country of OriginFrance
EU RoHS ComplianceCompliant
Mercury FreeYes
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