Schneider Electric LRD12 TeSys Deca Thermal Overload Relay 5.5-8A Class 10A
Schneider Electric LRD12 TeSys Deca Thermal Overload Relay 5.5-8A Class 10A
- MPN: LRD12
- PPN: SCH-LRD12
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CAD$124.05/ EA
Description
TeSys LRD thermal overload relay, 8A/690V, thermal setting range 5.5-8A, tripping class 10A, for protection of 3-phase motors 3kW@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 screw clamp terminals, it connects directly to the bottom terminals of 3-pole contactors LC1D09-D38. Mounting on DIN rail or screw fixing, separated from the contactor, with use of a terminal block LAD7B106 (to be ordered separately). Multi standards certified (IEC, UL, CSA, CCC, EAC, ATEX, Marine), Green Premium compliant (RoHs/Reach).
Features
- The LRD12 is a TeSys Deca (formerly TeSys D) differential thermal overload relay. Its primary function is to protect three-phase AC motors from overheating due to overloads or phase failures. It monitors the current flowing to the motor and trips the circuit if the heat reaches a level that could damage the motor windings.
- This model features an adjustable current dial with a range of 5.5 to 8 Amperes. You simply rotate the dial to match the Full Load Amps (FLA) listed on your motor's nameplate. It is a Class 10A relay, meaning it is designed to trip within 10 seconds or less at 7.2 times the setting, which is the industry standard for general-purpose motor protection.
- The LRD12 is specifically designed for "direct mounting" beneath Schneider TeSys Deca contactors, including models LC1D09 through LC1D38. The pins on the top of the LRD12 plug directly into the load terminals of the contactor, creating a space-saving, integrated motor starter assembly. It can also be DIN-rail mounted using a separate terminal block (LAD7B106).
- This is a differential relay, meaning it can detect an imbalance between the three phases. If one phase loses power (single-phasing), the internal mechanism reacts more quickly than a standard relay to shut down the motor, preventing the rapid heat buildup that is a leading cause of industrial motor burnout.
- The unit includes integrated auxiliary contacts (1 NO + 1 NC) to signal a fault to a controller or cut power to the contactor coil. It features a red "Stop" button and a blue "Reset" selector that allows you to choose between: Manual (H): The relay stays tripped until a technician pushes the reset button (recommended for safety). Automatic (A): The relay resets itself once the internal bimetallic strips have cooled down.
- The LRD12 is UL Listed, CSA Certified, and CE marked. It features IP20 "finger-safe" screw clamp terminals and is designed for millions of operations in demanding environments like pump stations, HVAC systems, and conveyor belts.
Specifications
- Amperage Range
- 5.5-8 A
- Thermal Overload Class
- Class 10A IEC 60947-4-1
- Motor Power Protection
- 3 kW @ 400 V
- Rated Operational Voltage
- 690 V AC 0-400 Hz power circuit IEC 60947-4-1
- Network Frequency
- 0-400 Hz
- Conventional Free Air Thermal Current
- 5 A signalling circuit
- Associated Fuse Rating
- 4 A gG, 4 A BS signalling circuit
- Connection Type
- Screw clamp terminals
- Height
- 66 mm (2.60 in)
- Depth
- 70 mm (2.76 in)
- Terminal Connection Size
- Control circuit: 1-2.5 mm²; Power circuit: 1.5-10 mm² flexible, 1-6 mm² solid
- IP Degree of Protection
- IP20 IEC 60529
- Flame Retardance
- V1 UL 94
- 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, GB/T 14048.4, GB/T 14048.5, EN 50495
- Compliance
- Green Premium, RoHS compliant with exemptions, REACH (SVHC above threshold)
- Device Type
- Differential thermal overload relay
- Product Compatibility
- LC1D09, LC1D12, LC1D18, LC1D25, LC1D32, LC1D38 contactors
- Mercury Free
- Yes
Thermal Protection Adjustment Range5.5-8 A
Tripping Threshold1.14 ± 0.06 x Ir IEC 60947-4-1
Voltage Rating600 V CSA/UL, 690 V IEC 60947-4-1
Network TypeAC, DC
Phase Failure SensitivityTripping current 130% of Ir on two phases, last one at zero
Permissible Current1.5 A at 240 V AC-15, 0.1 A at 250 V DC-13 signalling circuit
Tightening Torque1.7 N·m control and power circuit screw clamp terminals
Mounting SupportPlate, rail, under contactor with accessories
Width45 mm (1.77 in)
Net Weight0.124 kg (0.27 lb)
Material & ConstructionNot specified
Dielectric Strength1.89 kV 50 Hz IEC 60947-1
Mechanical RobustnessVibration 6 Gn IEC 60068-2-6, Shock 15 Gn IEC 60068-2-7
Product CertificationsIEC, UL, CSA, CCC, EAC, BV, RINA, DNV-GL, LROS, ATEX INERIS, UKCA
Country of OriginFrance
Product NameTeSys LRD, TeSys Deca
Control TypeRed push-button stop, Blue push-button reset
Warranty18 months
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