The TeSys D LC1D38U7 Contactor by Schneider Electric stands as one of the most dependable and widely used solutions in industrial motor control and power distribution systems. Designed for reliability, efficiency, and global compliance, it combines compact design with high operational performance. Whether you are a system designer, engineer, or maintenance professional, understanding the full technical depth of the TeSys D LC1D38U7 Contactor is essential for ensuring optimal system design, safe operation, and long-term durability.
In this comprehensive guide, we will explore the features, specifications, certifications, applications, and installation requirements of the TeSys D LC1D38U7. You’ll learn how its innovative engineering aligns with modern industrial standards and why it remains a preferred choice for motor control applications across industries.
What Is the TeSys D LC1D38U7 Contactor?
The TeSys D LC1D38U7 Contactor belongs to Schneider Electric’s TeSys D series, a product range recognized for its modularity, performance, and compact design. This 3-pole (3P) contactor is engineered for motor control and resistive load switching, delivering consistent performance across AC-3 and AC-1 utilization categories.
Its operational coil voltage of 240V AC at 50/60 Hz makes it suitable for both European and North American control systems. It features one normally open (1NO) and one normally closed (1NC) auxiliary contact—both designed for high reliability. The NC auxiliary contact carries mirror certification, a vital safety standard ensuring precise mechanical linkage and accurate signaling of contact position.
With a compact 45mm width, the LC1D38U7 Contactor achieves powerful performance within a small footprint. It handles up to 18.5 kW at 400V AC and supports motor currents up to 38A (AC-3) and resistive loads up to 50A (AC-1), making it ideal for control panel builders seeking high-density, space-efficient installations.
Key Features and Benefits of the TeSys D LC1D38U7 Contactor
1. High Mechanical and Electrical Durability
The TeSys D LC1D38U7 Contactor is rated for 15 million mechanical operations and 1.4 million electrical operations under rated load conditions. This endurance ensures dependable performance even in demanding industrial cycles, reducing maintenance frequency and total cost of ownership.
2. Global Compliance and Certification
It meets multiple international standards including IEC, UL, CSA, CCC, EAC, and Marine certifications, ensuring compatibility in global installations. It also complies with IEC 60947‑4‑1 for motor control safety and IEC 60335-1 Clause 30.2 for fire resistance.
This multi-standard compliance guarantees that the LC1D38U7 Contactor can be safely deployed across diverse environments—from industrial plants to marine systems—without compromising on safety or performance.
3. Compact and Efficient Design
At just 45mm wide, this compact design supports higher component density in control panels. Engineers can optimize valuable cabinet space without compromising performance, particularly important in high-density automation systems.
4. Extended Temperature and Environmental Resilience
The LC1D38U7 operates reliably in temperatures ranging from -40°C to +60°C, with derating options available up to +70°C. It can be installed at altitudes up to 3000 meters without current reduction, providing flexibility for installations in extreme or high-altitude conditions.
Electrical Ratings and Performance Specifications
Rated Voltage and Current
The TeSys D LC1D38U7 Contactor is designed for operational voltages up to 690V AC and 300V DC, supporting both 50 and 60 Hz frequencies. Its rated current depends on the load category:
- AC-3 (Motor Load): 38A at ≤440V AC
- AC-1 (Resistive Load): 50A at ≤440V AC
Motor Power Ratings
IEC Ratings (kW)
- 9 kW at 220–230V AC
- 18.5 kW at 380–690V AC
UL/CSA Ratings (Horsepower)
- 10 HP at 230/240V AC
- 20 HP at 480V AC
- 25 HP at 600V AC
This dual compliance ensures that the LC1D38U7 can serve both metric (IEC) and imperial (UL/CSA) system requirements.
Coil and Control Circuit Characteristics
The LC1D38U7’s coil operates at 240V AC 50/60Hz, without a built-in suppressor. Engineers should include external surge suppression devices such as the LAD4VG varistor or LAD4RCG RC suppressor to protect sensitive control components from voltage transients.
Durability, Thermal Management, and Endurance
Mechanical and Electrical Lifespan
Durability is a hallmark of the TeSys D LC1D38U7 Contactor. Its mechanical life of 15 million cycles and electrical endurance of 1.4 million cycles assure long-term reliability in motor control applications. The maximum operating rate of 3600 operations per hour supports high-cycle industrial use.
Power Dissipation
Efficient thermal performance is crucial for contact longevity and system stability. Power dissipation varies depending on the load type:
- AC-3 (Motor Control): 3W per pole (≈9W total)
- AC-1 (Resistive Load): 5W per pole (≈15W total)
Panel designers must account for this thermal output, especially in dense enclosures, to maintain ambient temperatures below 60°C and prevent derating.
Environmental Resilience
The TeSys D LC1D38U7’s fire-resistant housing complies with UL 94 V1 standards and withstands temperatures up to 850°C per IEC 60695-2-1. Its vibration resistance (2 Gn) and Green Premium compliance (RoHS and REACh) affirm its sustainability and durability under harsh conditions.
Understanding AC‑3e Utilization Category: High-Efficiency Motor Compatibility
What Is AC‑3e?
The AC‑3e utilization category extends the traditional AC‑3 rating to support high‑efficiency motors (IE3 and IE4). These motors draw higher inrush currents, which can increase contact wear if the contactor is not designed for such stress.
The LC1D38U7’s AC‑3e compliance ensures it can handle these inrush currents safely, making it ideal for modern energy-efficient installations.
Difference Between AC‑3e and AC‑4
While AC‑3e is meant for high‑efficiency motor starting and stopping during normal operation, AC‑4 involves rapid switching or inching/jogging operations. The LC1D38U7 is optimized for AC‑3 and AC‑3e applications—ideal for continuous motor operation rather than frequent reversal or high‑stress control.
Installation Guidelines for the TeSys D LC1D38U7 Contactor
Proper installation ensures the full performance and safety potential of the TeSys D LC1D38U7 Contactor.
Mounting Options
- DIN Rail: Standard 35mm mounting rail for quick installation
- Panel Mount: Secure screw mounting for fixed installations
Dimensions:
- Width: 45mm
- Height: 85mm
- Depth: 92mm
Terminal Tightening and Cable Requirements
The LC1D38U7 uses screw clamp terminals that require a tightening torque of 2.5 N·m. Proper torque application prevents overheating and ensures electrical integrity.
Recommended wire sizes:
- Solid conductors: 1.5–10 mm² (single) or 2.5–10 mm² (dual)
- Flexible conductors: 1–10 mm² (single with ferrule) or 1.5–6 mm² (dual with ferrule)
Always use a Phillips No. 2 or flat 6mm screwdriver for precision tightening.
Safety Certifications and Short-Circuit Ratings (SCCR)
International Certifications
The LC1D38U7 is certified under major safety standards, including:
- IEC 60947-4-1 and IEC 60947-5-1 (contactors and control circuits)
- UL and CSA listings for North American use
- Marine certification for vibration and humidity resilience
Short-Circuit Current Rating (SCCR)
The Short-Circuit Current Rating defines the maximum fault current the contactor can withstand:
- 100 kA with a 600V AC 80A Class J or CC fuse
- 85 kA with a 480V AC 60A circuit breaker
Choosing the proper coordination device ensures maximum safety and compliance with local electrical codes.
Integration with the TeSys Ecosystem
Thermal Overload Relay Pairing
The TeSys LRD35 thermal overload relay (30–38A range) is the perfect companion for the LC1D38U7. Together, they form a reliable motor starter assembly that ensures overload protection and long-term motor safety.
Surge Suppression Accessories
To protect the coil and connected control equipment, Schneider Electric recommends external surge suppressors:
- LAD4VG Varistor (for transient absorption)
- LAD4RCG RC Module (for AC coil suppression)
Additional Functional Accessories
Enhance the LC1D38U7’s functionality with modular accessories:
- Auxiliary contact blocks (front-mounted)
- Pneumatic or electronic time delay blocks
- Latching blocks like LAD9R1V for maintaining circuit closure
- Replacement coil: LXD1U7 (240V AC)
Alternatives and Product Line Overview
The LC1D38U7 is part of a large family of TeSys D contactors with various coil voltages and current capacities. If your application requires different specifications:
- Higher Current: LC1D50A (50A)
- Lower Current: LC1D32 (32A)
- Different Coil Voltage: LC1D38F7 (110V AC)
The series also includes models with alternative terminal technologies like EverLink BTR or spring terminals for faster and more secure wiring in vibration-prone environments.
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Conclusion: Future-Proof Motor Control with the TeSys D LC1D38U7 Contactor
In an era where energy efficiency, safety, and compactness define industrial control systems, the TeSys D LC1D38U7 Contactor stands out as a reliable, compliant, and efficient solution. From its AC‑3e rating for IE3/IE4 motors to its 100kA SCCR capability, it represents the next generation of motor control design.
For engineers and system designers looking to enhance performance and compliance, explore the TeSys D LC1D38U7 and compatible accessories at the Industrial Electrical Warehouse product page. Equip your systems with proven reliability and robust safety today.
