APC Schneider Electric LRD21 Thermal Overload Relay, 12-18 A, 690 V, 3 Poles, Class 10A, TeSys D

The APC Schneider Electric LRD21 is a high-performance thermal overload relay designed for the protection of motors against overload, phase failure, and prolonged start-up times. Part of the renowned TeSys D series, this relay ensures reliable and durable operation in industrial environments. With a compact design and easy integration, it is the ideal choice for safeguarding your electrical equipment.

Advantages

• Precise thermal protection with adjustable current range from 12 to 18 A
• Class 10A tripping characteristic ensures fast response to overloads
• Manual or automatic reset for flexible operation
• Compatible with TeSys D contactors (LC1D09 to LC1D38) for easy mounting
• High rated insulation voltage of 690 V AC and impulse withstand voltage of 6 kV
• Wide operating temperature range from -20 to 60 °C

Suitable for

• Motor protection in industrial automation and control panels
• Pumps, fans, compressors, and conveyors
• HVAC systems and material handling equipment
• Any application requiring reliable overload and phase failure protection

Key specifications

• Product Type: Thermal Overload Relay
• Number of Poles: 3
• Thermal Protection Adjustment Range: 12-18 A
• Rated Operational Voltage: 690 V AC 50/60 Hz
• Rated Insulation Voltage: 690 V AC
• Rated Impulse Withstand Voltage: 6 kV
• Tripping Class: Class 10A
• Auxiliary Contact Composition: 1 NO + 1 NC
• Mounting Support: Direct on contactor, Plate, Rail
• Connection Type: Screw clamp terminals
• Operating Temperature Range: -20 to 60 °C
• Storage Temperature Range: -60 to 70 °C
• Degree of Protection: IP20
• Standards: IEC 60947-4-1, UL 508, CSA C22.2 No 14
• Compatibility: TeSys D contactors (LC1D09 to LC1D38)
• Reset Type: Manual/Automatic
• Power Dissipation per Pole: 2.5 W at 18 A
• Certifications: UL, CSA, CCC, EAC, ATEX, BV, RINA, LROS, DNV, GL

Recommendations

For optimal performance, pair the LRD21 with a compatible TeSys D contactor and ensure proper wiring according to the manufacturer's guidelines. Regularly test the relay to confirm correct operation.