LRD21 – Schneider Electric TeSys LRD Thermal Overload Relay, 12-18A, Class 10A, In Stock
Buy the Schneider Electric LRD21, a TeSys LRD differential thermal overload relay, 3-pole, 12-18 A adjustment range, Class 10A tripping, with 1NO+1NC auxiliary contacts and screw clamp terminals. In stock and available for fast shipping. Get a quote today.
Key Technical Specifications
- Product Type: Differential thermal overload relay, TeSys LRD
- Relay Application: Motor protection
- Overload Tripping Class: 10A (per IEC 60947-4-1)
- Thermal Protection Adjustment Range: 12–18 A
- Number of Poles: 3P
- Rated Insulation Voltage: 690 V (IEC); 600 V (UL/CSA)
- Network Type: AC/DC, 0–400 Hz
- Auxiliary Contacts: 1NO+1NC (fault signalling)
- Trip Unit: Bimetallic, ambient temperature compensated
- Tripping Threshold: 1.14 ±0.06 Ir (per IEC 60947-4-1)
- Rated Impulse Withstand Voltage: 6 kV
- Conventional Free Air Thermal Current (Ith): 5 A for signalling circuit
- Terminal Type: Screw clamp (1–2.5 mm² control circuit)
- Compatible Contactors: LC1D18, LC1D25, LC1D32, LC1D38
- Mounting Support: Plate with accessories, rail with accessories, or directly under a compatible contactor
- Enclosure Rating: IP20
- Dimensions: 70mm L x 45mm W
- Ambient Temperature: -20°C to 60°C
- Approvals: UL 508, CSA C22.2 No. 14, IEC 60947-4-1/60947-5-1, CE Marked, ATEX 94/9, RoHS Compliant
Design and Performance
Differential Protection Against Phase Failure and Long Starting Times
Designed to protect AC circuits and motors against overload, phase failure, and long starting times, the LRD21 provides comprehensive motor protection beyond simple overcurrent detection alone.
Simple, Tool-Free Direct Mounting
Aligns its power terminals directly with the corresponding terminals on a compatible TeSys D contactor and pushes firmly into place, providing quick, tool-free installation for compact motor starter assemblies.
Clear Manual Controls for Reset and Stop
A blue RESET button and red STOP button provide intuitive, color-coded manual control, while auxiliary contacts (97NO/98NO, 95NC/96NC) support external status signaling and interlocking.
High Impulse Withstand for Reliable Protection
Rated for 6 kV impulse withstand voltage, the LRD21 supports reliable operation even under transient voltage surge conditions common in industrial power systems.
Wide Range of Compatible Contactor Sizes
Compatible with LC1D18, LC1D25, LC1D32, and LC1D38 contactors, the LRD21 covers a broad span of motor starter configurations within a single overload relay reference.
Why Buy the LRD21 From Us
- In stock and ready for immediate dispatch
- Fast shipping on every order
- Commercial advisory support to help you confirm the right LRD overload relay for your TeSys D contactor
- Competitive pricing — get a quote in minutes
