Documentation & Downloads
Schneider Electric LRD3355 TeSys Deca Thermal Overload Relay 30-40A, Class 10A, IP20
- MPN: LRD3355
- PPN: SCH-LRD3355
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$217.80
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Description
TeSys LRD thermal overload relay, 40A/1000V, thermal setting range 30-40A, tripping class 10A, for protection of 3-phase motors 18.5kW@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 integration, this thermal overload relay plugs directly into the bottom of LC1D80 and LC1D95 TeSys D contactors without the need for additional wiring or mounting hardware. This "plug-and-play" design reduces installation time by up to 50%, minimizes potential wiring errors, and creates a compact, space-saving motor starter assembly inside your control cabinet.
- Featuring a high-precision adjustment dial, this relay allows you to set the protection threshold exactly between 30A and 40A to match your motor's Full Load Amps (FLA). This granular control ensures your 3-phase motor is protected against subtle overheating conditions that cause insulation breakdown, effectively extending the lifespan of your expensive industrial equipment.
- Built with sophisticated differential tripping technology, the LRD3355 detects phase imbalance and single-phasing conditions (phase loss) almost instantly. By cutting power the moment an unbalanced load is detected, it prevents catastrophic motor burnout—a common and costly failure in industrial pump and fan applications where power quality can fluctuate.
- Equipped with a blue "Reset" button and a selector for manual or automatic modes, this unit gives facility managers total control over system uptime. The manual mode forces an inspection before restart for safety, while the integrated "Test" and "Stop" functions allow technicians to simulate a trip, ensuring the control circuit is fully operational without risk to the connected load.
- As a Class 10 overload, this device is designed to trip within 10 seconds of a locked-rotor condition (600% of setting), providing the ideal balance for standard industrial loads. This rapid response time protects your motor windings from the extreme heat generated during mechanical jams or heavy-load startups, ensuring compliance with UL and IEC 60947-4-1 global safety standards.
Documentation & Downloads
Specifications
Additional
- Rated Operational Voltage
- 1000 V AC, 0-400 Hz
- Thermal Setting Range
- 30-40 A
- Tripping Threshold
- 1.14 ± 0.06 Ir IEC 60947-4-1
- Associated Fuse Rating
- 4 A gG, 4 A BS for signalling circuit
- Conventional Free Air Thermal Current
- 5 A signalling circuit
- Rated Impulse Withstand Voltage
- 6 kV IEC 60947-1
- Temperature Range
- Operation -20 to 60 °C, Storage -60 to 70 °C
- Thermal Protection Adjustment Range
- 30-40 A
- Product Compatibility
- LC1D80, LC1D95 contactors
- Control Type
- Red push-button stop, Blue push-button reset
- Tightening Torque
- Control circuit 1.7 N·m, Power circuit 9 N·m screw clamp terminals
- Net Weight
- 0.51 kg (1.12 lb)
- Dielectric Strength
- 2.2 kV 50 Hz IEC 60947-1
- Flame Retardance
- V1 UL 94
- Standards
- IEC 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
- Compliance
- RoHS, REACH, Mercury free, Toxic heavy metal free, China RoHS
- Range
- TeSys LRD, TeSys Deca
- Sustainable Offer Status
- Green Premium product
- Toxic Heavy Metal Free
- Yes
- Circularity Profile
- ENVEOLI1101001
- Reach Regulation
- Free of substances of very high concern above threshold
- Environmental Disclosure
- ENVPEP110101EN
- Country of Origin
- France
Current Range30-40 A
Tripping ClassClass 10A IEC 60947-4-1
Phase Failure SensitivityTrip at 130% of Ir on two phases, last at 0
Permissible Current0.72 A 500 V AC-15 signalling circuit, 0.06 A 440 V DC-13 signalling circuit
Rated Insulation Voltage1000 V IEC 60947-4-1 power circuit, 600 V CSA and UL
Network TypeAC, DC
Thermal Overload ClassClass 10A IEC 60947-4-1
Device Short NameLRD
Auxiliary Contacts1 NO + 1 NC
Terminal Connection TypeScrew clamp terminals for power circuit 4-35 mm² and control circuit 1-2.5 mm²
Dimensions (HxWxD)81 x 70 x 115 mm (3.19 x 2.76 x 4.53 in)
MountingDIN rail, plate (with accessories), under contactor
IP RatingIP20 IEC 60529
Mechanical RobustnessVibrations 6 Gn IEC 60068-2-6, Shocks 15 Gn IEC 60068-2-7
CertificationsIEC, UL, CSA, CCC, EAC, ATEX, INERIS, UKCA
Product TypeDifferential thermal overload relay
Climatic WithstandIACS E10
Rohs Exemption InformationYes
Eu Rohs DirectiveCompliant
China Rohs RegulationPro-active China RoHS declaration (out of China RoHS legal scope)
Reach Free Of SvhcYes
Mercury FreeYes
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CAD
$217.80
/ EA
Available to Order
Available to Ship Same/Next Business Day if In Stock and Ordered before 12:00 PM EST
Company Stock:
0
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CAD$217.80/ EA
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