1. Automation/Motion Controls For Sale
  2. sku: 16117109616966853
  3. SCHNEIDER LRD21C

SCHNEIDER Thermal Overload Relay 1PCS LRD-21C 12-18A

Lrd-21c Schneider Lrd21c 1pcs New Thermal Overload Relay 12-18a Fast Shipping

( Brand: Schneider ), ( Manufacturer Part Number: LRD21C ), ( Controller Platform: Automate )

Review SCHNEIDER 1pcs New Thermal Overload Relay 12-18a Fast Shipping

The **Schneider Electric LRD21C Thermal Overload Relay (12 18A)** is a robust and precision-engineered protection device designed to safeguard electric motors and other inductive loads from excessive thermal stress, ensuring reliable operation and extended equipment lifespan. Part of Schneider s trusted LRD series, this compact yet highly efficient relay combines thermal overload protection with a modular, easy-to-install design, making it an ideal choice for industrial, commercial, and automation applications. Built with Schneider s signature reliability, the LRD21C features a **bimetallic thermal element** that accurately detects overheating in the motor windings, providing both **thermal and magnetic trip protection** to prevent damage from overloads, stalling, or short circuits. Its **12 18A current rating** makes it well-suited for a wide range of three-phase motors, from small pumps and compressors to conveyor systems and HVAC components, while its **120V AC or 24V DC coil options** offer flexibility for integration into diverse control systems.

The LRD21C stands out with its **adjustable trip settings**, allowing users to fine-tune the thermal protection curve to match specific motor requirements, whether for standard or high-starting torque applications. Its **mechanical trip mechanism** ensures immediate disconnection in case of a fault, while the **resettable thermal element** simplifies maintenance by eliminating the need for replacement after a trip just reset and restore power. The relay s **compact DIN-rail mounting** and **standardized terminal block** facilitate quick installation in control panels, reducing downtime and wiring complexity. Additionally, Schneider s **IP20 protection rating** ensures durability in standard industrial environments, though it is not rated for harsh or outdoor conditions without additional enclosure protection.

Beyond its core protective functions, the LRD21C integrates seamlessly with Schneider s **Modbus RTU or Profibus DP** communication protocols (via optional accessories), enabling advanced monitoring and diagnostics in larger automation systems. Its **low power consumption** and **long operational lifespan** further enhance efficiency, making it a cost-effective solution for both new installations and retrofits. Whether used in manufacturing plants, food processing facilities, or renewable energy systems, this overload relay delivers **consistent, fail-safe performance**, helping to minimize equipment failure, reduce energy waste, and comply with safety standards like **IEC 60947-4-1**. For engineers and technicians prioritizing reliability, ease of use, and long-term cost savings, the Schneider LRD21C is an indispensable component in any motor protection strategy.

**Pros and Cons of buying a Schneider LRD21C (1pcs) Thermal Overload Relay (12-18A)**

### **Pros**

1. **Reliability and Quality** Schneider Electric is a well-established brand known for manufacturing high-quality electrical components. The LRD21C is designed for durability and consistent performance in industrial and commercial applications.

2. **Thermal Overload Protection** This relay provides essential overload protection for motors and other electrical devices, preventing damage from excessive current. It helps extend the lifespan of equipment by cutting off power when overheating occurs.

3. **Adjustable Settings** The LRD21C allows for manual adjustment of the trip current, making it suitable for different motor sizes and load requirements within its 12-18A range.

4. **Compact and Easy to Install** The single-pole design makes it space-efficient and straightforward to integrate into existing electrical panels or control circuits.

5. **Compatibility with Schneider Systems** If you already use Schneider components, this relay will seamlessly fit into your existing setup, reducing compatibility issues.

6. **Cost-Effective for Basic Protection** Compared to more advanced overload relays, this model offers reliable protection at a relatively affordable price, making it a practical choice for budget-conscious buyers.

7. **Industrial-Grade Construction** Built to withstand harsh environments, it is suitable for applications in factories, workshops, and other industrial settings.

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### **Cons**

1. **Limited Current Range** The 12-18A range may be too narrow for larger motors or high-power applications, requiring additional relays or a different model if higher current ratings are needed.

2. **Manual Adjustment Only** Unlike some digital or programmable overload relays, the LRD21C requires manual setting adjustments, which may be less convenient for frequent changes or automated systems.

3. **No Built-In Diagnostics** It lacks advanced features such as fault diagnostics, remote monitoring, or communication interfaces, which could be useful in complex control systems.

4. **Single-Pole Design** While compact, a single-pole relay may not be sufficient for three-phase motor protection, requiring additional components (such as a contactor) for full motor control.

5. **Potential for False Trips** If not properly calibrated or if there are fluctuations in the power supply, the relay might trip unexpectedly, causing downtime.

6. **Limited Brand Support Outside Schneider Ecosystems** If you re not already using Schneider products, you may need to source additional components or wiring to ensure compatibility.

7. **No Built-In Delay Options** Some overload relays offer adjustable time delays to accommodate starting currents; this model may not provide that flexibility without external modifications.

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### **Conclusion**

The Schneider LRD21C is a solid, reliable choice for basic thermal overload protection in applications requiring 12-18A current. It excels in simplicity, durability, and cost-effectiveness for small to medium motors where manual adjustment is acceptable. However, it may fall short for advanced applications needing programmable settings, multi-phase protection, or diagnostic features.

If your needs align with its specifications such as protecting a single-phase motor in a controlled environment this relay is a practical and dependable purchase. For more complex setups, consider supplementing it with additional components or exploring models with expanded functionality.

### **Recommendation**

**Buy the Schneider LRD21C if:**

- You need a simple, reliable thermal overload relay for a 12-18A motor.

- You re working within a Schneider-compatible system.

- Budget and space constraints favor a compact, single-pole solution.

- Manual adjustment is acceptable for your application.

**Consider alternatives if:**

- You require protection for larger motors or multi-phase systems.

- You need programmable or digital overload relays with diagnostics.

- Your setup demands remote monitoring or advanced control features.

- You frequently adjust settings and would benefit from easier calibration.

Details:

The LRD21C is a trusted component for industrial automation and motion control applications, providing dependable solution monitoring regulating motor temperatures. With fast shipping available, this reliable and high-quality relay ensures the protection of motor safe operation system. It is specifically rated for currents ranging from 12 to 18 amps. The product is a new Schneider LRD21C thermal overload relay designed for automation systems.

part #: lrd21c prices

  • $11.19-$28.86

specifications automationjack:

  • brand: Schneider
  • mpn: Lrd21c
  • controller platform: Automate

offer automationjack:

  • options: Ship-to-home
  • availability: In Stock
  • sold: 0
  • quantity: 6
  • best offers: True
  • started: June 12, 2026

shipping automationjack:

  • carrier: USPS
  • cost: $5.62
  • class: Standard
  • type: Calculated
  • transit: 5-12 Days
  • service: USPS Ground Advantage

payments automationjack:

  • credit card: Mastercard
  • wallet: Google-pay
  • other

general automationjack:

  • Business Industrial > Industrial Automation Motion Controls > Other Automation Equipment
  • condition: Used

returns automationjack:

  • policy: No Returns

seller automationjack:

  • city: Granada Hills, California
  • rating: 98.2%
  • # reviews: 767
controller platform: automate,
category: business & industrial > industrial automation motion controls > automation equipment, sku: 16117109616966853,
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4 offers $11.19–$28.86 USD
  • Used. Offer #1 priced at $14.99 + $5.62 shipping estimate = $20.61* total. The is a trusted component for industrial automation and motion control applications, providing a dependable solution for monitoring and regulating motor temperatures. The product is a new Schneider thermal overload relay designed for automation systems.+$5.62 shipping
  • New. Offer #2 priced at $28.86 + $0.00 shipping estimate = $28.86* total. How many months warranty do you provide ?.FREE SHIPPING
  • New. Offer #3 priced at $11.19 + $9.99 shipping estimate = $21.18* total. +$9.99 shipping
  • Used. Offer #4 priced at $37.38 + $5.50 shipping estimate = $42.88* total. All products must be in the exact condition they were received in. Used - Item was removed from working machine and is fully functional.+$5.50 shipping

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