Schneider Electric LRD21 TeSys LRD Thermal Overload Relay – 12–18A, Class 10A
The Schneider Electric LRD21 is a TeSys LRD / TeSys Deca differential thermal overload relay designed for motor protection against overload and phase failure. It provides an adjustable 12–18A thermal protection range with a Class 10A trip characteristic and is compatible with LC1D18, LC1D25, LC1D32 and LC1D38 TeSys D contactors.
Description
The Schneider Electric LRD21 TeSys LRD thermal overload relay provides reliable motor overload protection for industrial motor-control applications. Its adjustable 12–18A thermal setting range allows the protection level to be matched to the motor’s nameplate full-load current, while the Class 10A characteristic conforms to IEC 60947-4-1.
The LRD21 overload relay uses differential thermal protection and is sensitive to phase failure. It can be mounted directly under compatible TeSys D contactors, forming a compact motor starter, or installed separately using the appropriate mounting accessory. Schneider Electric specifies compatibility with LC1D18, LC1D25, LC1D32 and LC1D38 contactors.
The relay features 1NO + 1NC auxiliary contacts, a 130% Ir phase-failure sensitivity, 690V AC rated operational voltage, 6kV impulse withstand voltage, and temperature compensation from -20°C to +60°C.
| Specification | Details |
|---|---|
| Manufacturer | Schneider Electric |
| Model / Reference | LRD21 |
| Product Range | TeSys LRD / TeSys Deca |
| Product Type | Differential Thermal Overload Relay |
| Device Short Name | LRD |
| Relay Application | Motor Protection |
| Thermal Protection Adjustment Range | 12–18A |
| Thermal Overload Class | Class 10A |
| Thermal Class Standard | IEC 60947-4-1 |
| Product Compatibility | LC1D18, LC1D25, LC1D32, LC1D38 |
| Network Type | AC/DC |
| Network Frequency | 0–400Hz |
| Rated Operational Voltage | 690V AC, 0–400Hz |
| Rated Insulation Voltage | 690V IEC / 600V UL / 600V CSA |
| Rated Impulse Withstand Voltage | 6kV |
| Tripping Threshold | 1.14 ± 0.06 Ir |
| Phase Failure Sensitivity | 130% of Ir on two phases; last phase at 0 |
| Auxiliary Contacts | 1NO + 1NC |
| Signalling Thermal Current | 5A |
| Signalling Current | 1.5A at 240V AC-15; 0.1A at 250V DC-13 |
| Temperature Compensation | -20°C to +60°C |
| Operating Temperature | -20°C to +60°C without derating |
| Mounting | Under contactor, rail or plate with appropriate accessories |
| Control Type | Red STOP push-button; blue RESET push-button |
| Terminal Type | Screw-clamp terminals |
| IP Degree of Protection | IP20 |
| IP Standard | IEC 60529 |
| Mercury Free | Yes |
| Product Certifications | RINA, CCC, GOST, DNV, LROS, UL, CSA, BV, ATEX, INERIS, GL |
| Net Weight | 0.124kg |
Key Features
- 12–18A adjustable thermal protection range
- Class 10A thermal overload protection
- Differential thermal overload relay
- Designed for motor protection
- Protection against motor overload
- Phase-failure sensitivity
- 1NO + 1NC auxiliary contacts
- 1.14 ± 0.06 Ir tripping threshold
- 130% Ir phase-failure sensitivity
- 690V AC rated operational voltage
- 6kV impulse withstand voltage
- Temperature compensation from -20°C to +60°C
- IP20 degree of protection
- Screw-clamp terminals
- Direct mounting under compatible TeSys D contactors
- Manual reset and stop functions
- Mercury-free construction
- Suitable for industrial motor starter assemblies
Applications
The Schneider Electric LRD21 overload relay is suitable for:
- Industrial motor protection
- Motor starter assemblies
- Motor overload protection
- Phase failure protection
- Motor control panels
- Pumps and pumping systems
- Fans and ventilation equipment
- Compressors
- Conveyors
- HVAC equipment
- Machine tools
- Industrial machinery
- Electrical automation panels
- TeSys D LC1D18, LC1D25, LC1D32 and LC1D38 contactor assemblies
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