1. Introduzione è Overview
The Schneider Electric LRD series thermal overload relays are designed to provide reliable overload protection for AC circuits, particularly when paired with LC1D contactors. These three-pole thermal magnetic trip relays are known for their compact size, light weight, low power consumption, and long service life, ensuring safety and reliability in industrial control applications.
Please note: Schneider Electric LRD series products are subject to upgrades. The black version represents a newer iteration of the product line.
2. Caratteristiche di u produttu è Avanzamentutages
- High-Quality Copper Pins: Equipped with sensitive and stable copper pins, ensuring reliable contact and performance.
- Flame-Retardant PC Shell: The robust PC material shell is corrosion-resistant, wear-resistant, and features high flame-retardant properties, contributing to a long and stable operational life.
- Accurate Current Setting Dial: Features an accurate and sensitive current setting dial, allowing for continuous adjustment of the overall current to ensure precise and safe operation.
- Cablaggio sicuru: Utilizes crimp-type wiring with screw fastening, designed to prevent accidental contact and ensure secure, reliable connections. Silver alloy contacts are used to handle large currents efficiently.
3. Product Structure Analysis
The LRD thermal overload relay features a clear and intuitive design for ease of use and maintenance. Key components include:
- Copper Pins: For main power connections.
- Tripping Indication: Visual indicator for overload events.
- Current Setting Dial: Adjustable dial to set the desired current protection range.
- Reset Button (Blue): Used to reset the relay after a trip.
- Pulsante di stop (rossu): Manual stop function.
- Normally Open (NO) Contacts (97 NO, 98 NO): Auxiliary contacts for control circuits.
- Normally Closed (NC) Contacts (95 NC, 96 NC): Auxiliary contacts for control circuits.
- T1, T2, T3 Connection Ports: Output terminals for connecting to the motor or load.
4. Specificazioni
4.1 Parametri di basa
| Parametru | Valore | Parametru | Valore |
|---|---|---|---|
| Marca di produttu | Schneider Electric (Shi Naide Electric) | Modellu di produttu | LRD |
| Number of circuit poles | 3 poli | Nome di u produttu | 3 Extreme thermal overload relay |
| Tripping level | 10A | Temperature di almacenamiento | -60 ° C ~ + 70 ° C |
| Isolamentu voltage | 690V | Operating temperature (no volume reduction) | -20 ° C ~ + 60 ° C |
| Shock withstand voltage | 6KV | Operating temperature (with capacity reduction) | -20 ° C ~ + 60 ° C |
| Agreed heating current | 5A | Compensazione di temperatura | -20 ° C ~ + 60 ° C |
| Seismic performance | 6 gn | Resistenza à l'impattu | 15gn~11ms |
| Phase deficiency sensitivity | The tripping current I is 30% of IR, and the other two phases are IR. | ||
| Metudu di stallazione | Combined installation and independent installation with contactor. | ||
4.2 Guida di selezzione di mudelli
Refer to the table below to select the appropriate LRD thermal overload relay model based on the current regulation range and adaptive contactor.
| Modellu di produttu | Current regulation range | Adaptive contactor | Suitable base |
|---|---|---|---|
| LRD01C | 0.1-0.16A | LC1D09-38 | LAD7B106C |
| LRD02C | 0.16-0.25A | LC1D09-38 | |
| LRD03C | 0.25-0.4A | LC1D09-38 | |
| LRD04C | 0.4-0.63A | LC1D09-38 | |
| LRD05C | 0.63-1A | LC1D09-38 | |
| LRD06C | 1-1.6A | LC1D09-38 | |
| LRD07C | 1.6-2.5A | LC1D09-38 | |
| LRD08C | 2.5-4A | LC1D09-38 | |
| LRD10C | 4-6A | LC1D09-38 | |
| LRD12C | 5.5-8A | LC1D09-38 | |
| LRD14C | 7-10A | LC1D09-38 | |
| LRD16C | 9-13A | LC1D12-38 | |
| LRD21C | 12-18A | LC1D18-38 | |
| LRD22C | 16-24A | LC1D25-38 | |
| LRD32C | 23-32A | LC1D25-38 | |
| LRD35C | 30-38A | LC1D32-38 |
5. Setup è Installazione
The LRD thermal overload relay can be installed either combined with a contactor or as an independent unit. Always ensure power is disconnected before installation.
5.1 Istruzzioni di cablaggio
- Use crimp-type wiring and ensure all screws are securely fastened.
- Connect the main power lines to the T1, T2, T3 connection ports.
- Auxiliary contacts (97 NO, 98 NO, 95 NC, 96 NC) can be used for control circuits, such as signaling or interlocking.
5.2 Contactor Compatibility
TeSys series contactors and TeSys series thermal relays are designed for direct plug-in compatibility. However, this relay cannot be directly plugged in with other series of thermal relays. Refer to the model selection guide (Figure 8 and Figure 9) to ensure compatibility with your contactor.
5.3 Packaging and Certification
6. Operazione
6.1 Setting Current
Use the current setting dial on the front of the relay to adjust the desired current protection range. Ensure the setting matches the motor's rated current to provide optimal overload protection.
6.2 Reimpostazione di u relè
In case of an overload trip, the tripping indication will activate. After resolving the overload condition, press the blue RESET button to reset the relay and restore operation.
6.3 Arrestu manuale
U rossu STOP button can be used to manually stop the circuit controlled by the relay.
7. Mantenimentu
Regular inspection of the thermal overload relay is recommended to ensure optimal performance and safety. Check for any signs of physical damage, loose connections, or excessive heat. Keep the relay free from dust and debris. No specific user-serviceable parts are inside; refer to qualified personnel for any repairs.
8. Risoluzione di prublemi
If the relay trips frequently, investigate the cause of the overload. Common causes include:
- Motor overload due to mechanical issues or excessive load.
- Incorrect current setting on the relay.
- Phase imbalance or loss.
- Faulty motor or wiring.
Ensure the current setting is appropriate for the motor and that all connections are secure. If the issue persists, consult a qualified electrician.
9. Cunsiglii d'utilizatori
- Always verify the current rating of your motor and select an LRD relay with a compatible current regulation range.
- Ensure proper ventilation around the relay to prevent overheating, especially in enclosed panels.
- For critical applications, consider periodic testing of the trip function to confirm relay responsiveness.
10. Video Overview
Watch this video for a visual demonstration of the Schneider Electric LRD21C thermal overload relay's physical features and operation.
11. Garanzia è Support
For warranty information and technical support, please refer to the official Schneider Electric documentation or contact your authorized dealer. Keep your purchase records for any warranty claims.