Schneider Electric LRD22 TeSys Deca Thermal Overload Relay 16-24A 1NO+1NC Class 10A
Schneider Electric LRD22 TeSys Deca Thermal Overload Relay 16-24A 1NO+1NC Class 10A
- MPN: LRD22
- PPN: SCH-LRD22
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CAD$144.88/ EA
Description
TeSys LRD thermal overload relay, 24A/690V, thermal setting range 16-24A, tripping class 10A, for protection of 3-phase motors 11kW@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 LC1D25-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 LRD22 is a TeSys Deca differential thermal overload relay designed to protect AC motors against overloads and phase failures. It monitors the current drawn by the motor and, if it exceeds the set threshold for a specific period, it trips the associated contactor to cut power, preventing permanent insulation damage and motor burnout.
- The LRD22 features a precise adjustment dial ranging from 16 to 24 Amps. This allows you to match the protection exactly to your motor's Full Load Amps (FLA) as listed on its nameplate. It provides Class 10 protection, meaning it will trip within 10 seconds at six times the rated current—perfect for standard industrial startups.
- This relay is specifically engineered to detect phase unbalance or phase loss. If one phase fails (single-phasing), the internal differential mechanism detects the discrepancy and trips the motor faster than a standard overload relay. This is critical because a motor running on two phases will quickly overheat and fail.
- The unit is equipped with 1 NO (Normally Open) + 1 NC (Normally Closed) auxiliary contacts. In a typical control circuit, the NC contact is wired to the contactor coil to stop the motor on a fault, while the NO contact is used to trigger a fault light or send a signal to a PLC for remote diagnostics.
- The LRD22 features a blue selector lever that lets you choose between Manual or Automatic reset modes. Manual reset is standard for safety, requiring a technician to check the machine before restarting. It also includes an integrated "Test" button to simulate a trip and a "Stop" button to manually break the control circuit.
Specifications
- Thermal Protection Adjustment Range
- 16-24 A
- Rated Operational Voltage
- 690 V AC 0-400 Hz
- Tripping Threshold
- 1.14 +/- 0.06 Ir IEC 60947-4-1
- Conventional Free Air Thermal Current
- 5 A signalling circuit
- Rated Impulse Withstand Voltage
- 6 kV
- Phase Failure Sensitivity
- Tripping current 130% of Ir on two phases
- Temperature Compensation Range
- -20 to 60 °C
- Connection Type
- Screw clamp terminals
- Tightening Torque
- Control circuit 1.7 N.m, Power circuit 2.5 N.m
- Net Weight
- 0.124 kg (0.27 lb)
- Ambient Air Temperature for Operation
- -20 to 60 °C (-4 to 140 °F)
- Dielectric Strength
- 1.89 kV 50 Hz IEC 60947-1
- 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, GB/T 14048.4, GB/T 14048.5, EN 50495
- Material
- Mercury Free
Current Rating24 A
Thermal Overload ClassClass 10A IEC 60947-4-1
Rated Insulation Voltage600 V CSA, 600 V UL, 690 V IEC 60947-4-1
Permissible Current1.5 A 240 V AC-15 signalling circuit, 0.1 A 250 V DC-13 signalling circuit
Network Frequency0-400 Hz
Control TypeRed push-button stop, Blue push-button reset
Mounting SupportPlate, rail with specific accessories, under contactor
Screw Clamp Terminals SizeControl circuit: 1-2.5 mm², Power circuit: 1-10 mm²
Dimensions (H x W x D)66 mm x 45 mm x 70 mm (2.60 in x 1.77 in x 2.76 in)
IP Degree of ProtectionIP20 IEC 60529
Ambient Air Temperature for Storage-60 to 70 °C (-76 to 158 °F)
Mechanical RobustnessVibrations 6 Gn IEC 60068-2-6, Shocks 15 Gn 11 ms IEC 60068-2-7
Product CertificationsIEC, UL, CSA, CCC, EAC, ATEX, Marine, BV, RINA, DNV-GL, LROS, UKCA
Country of OriginFrance
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CAD$144.88/ EA
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