1. Introduction
This manual provides essential information for the safe and effective installation, operation, and maintenance of your Schneider LC1D Series Three-pole AC Contactor. The LC1D series contactors are designed for switching electrical loads in various industrial and commercial applications. Please read this manual thoroughly before using the product.
2. Safety Information
WARNING: Electrical shock hazard. Only qualified personnel should install, operate, or service this equipment.
- Always disconnect power before installing or servicing the contactor.
- Ensure proper grounding and wiring according to local and national electrical codes.
- Do not operate the contactor if it is damaged or appears to be malfunctioning.
- Wear appropriate personal protective equipment (PPE) when working with electrical systems.
- Verify that the voltage and current ratings of the contactor match your application requirements.
3. Product Overview
The Schneider LC1D series AC contactor is a robust device designed for reliable switching of AC circuits. It features a three-pole configuration and is available in various current and coil voltage ratings.
3.1. Component Identification
The contactor's design facilitates easy installation and connection. Key components include:
- L1, L2, L3 Inlets: Main power input terminals.
- T1, T2, T3 Outlets: Main power output terminals.
- A1, A2 Connection Ports: Terminals for coil control voltage.
- NO/NC Auxiliary Contacts: Normally Open (NO) and Normally Closed (NC) contacts for control circuits.
- 35mm DIN Rail Mounting: For quick and secure installation in control panels.
- Screw Mounting Hole: Alternative mounting option.
Figure 1: Product Structure Analysis of LC1D09 AC Contactor, highlighting main power terminals, coil connections, and mounting options.
3.2. Internal Components and Features
The LC1D contactor is built with high-quality materials for durability and performance:
- Silver Alloy Contacts: Provide excellent conductivity and resistance to arcing.
- 33-piece Iron Core: Ensures strong conductivity, wear resistance, and superior performance.
- Flame-retardant Casing: Enhances electrical safety and fire protection.
- Copper Coil: Features low power consumption and ensures smoother operation.
- Strong Spring: Allows for quick return and rapid power disconnection.
Figure 2: Exploded view showing internal components like silver alloy contacts, iron core, flame-retardant casing, copper coil, and strong spring.
Figure 3: Close-up of terminals, identifying NC/NO auxiliary contacts, coil control voltage input, and main contact input.
4. Specifications
The following table details the general specifications for the Schneider LC1D series AC contactors. Specific models vary by current rating and coil voltage.
| Attribute | Value |
|---|---|
| Brand | Schneider |
| Model Series | LC1D (LC1D09, LC1D12, LC1D18, LC1D25, LC1D32, LC1D38) |
| Main Circuit Rating Voltage | 690V |
| Phase | 3 |
| Number of Poles | 3 |
| Electricity Type | AC |
| Certification | CE |
| Origin | Mainland China |
| Package Dimensions (L x W x H) | 20 cm x 15 cm x 10 cm |
| Package Weight | 0.42 kg |
4.1. Model Selection Table (LC1-D Series)
The following table provides a detailed breakdown of available models based on current rating and coil voltage. Note that TeSys series contactors can be directly plugged into TeSys series thermal relays, but not other series.
Figure 4: LC1-D Series Contactor Selection Table.
| Current (Amps) | Coil Voltage (AC Voltage) | |||
|---|---|---|---|---|
| AC: 24V | AC: 110V | AC: 220V | AC: 380V | |
| 9A | LC1D09B7C | LC1D09F7C | LC1D09M7C | LC1D09Q7C |
| 12A | LC1D12B7C | LC1D12F7C | LC1D12M7C | LC1D12Q7C |
| 18A | LC1D18B7C | LC1D18F7C | LC1D18M7C | LC1D18Q7C |
| 25A | LC1D25B7C | LC1D25F7C | LC1D25M7C | LC1D25Q7C |
| 32A | LC1D32B7C | LC1D32F7C | LC1D32M7C | LC1D32Q7C |
| 38A | LC1D38B7C | LC1D38F7C | LC1D38M7C | LC1D38Q7C |
| 40A | LC1D40B7C | LC1D40F7C | LC1D40M7C | LC1D40Q7C |
| 50A | LC1D50B7C | LC1D50F7C | LC1D50M7C | LC1D50Q7C |
| 65A | LC1D65B7C | LC1D65F7C | LC1D65M7C | LC1D65Q7C |
| 80A | LC1D80B7C | LC1D80F7C | LC1D80M7C | LC1D80Q7C |
5. Installation and Setup
Proper installation is crucial for the safe and reliable operation of your AC contactor. Follow these guidelines:
5.1. Mounting
The contactor can be mounted using either the 35mm DIN rail or screw mounting holes. Ensure the mounting surface is stable and free from excessive vibration.
- DIN Rail Mounting: Snap the contactor onto a standard 35mm DIN rail.
- Screw Mounting: Use appropriate screws to secure the contactor through the designated mounting holes.
5.2. Wiring
Refer to the product structure analysis diagram (Figure 1) and terminal identification (Figure 3) for correct wiring connections.
- Main Power Circuit: Connect the incoming power lines to the L1, L2, L3 inlet terminals. Connect the load lines to the T1, T2, T3 outlet terminals.
- Control Circuit (Coil): Connect the control voltage supply to the A1 and A2 connection ports. Ensure the coil voltage matches the specified rating of your contactor model (e.g., 24V, 110V, 220V, 380V, 48V).
- Auxiliary Contacts: If using, connect control circuit wiring to the NO (Normally Open) and NC (Normally Closed) auxiliary contacts as required by your application.
Note: TeSys series contactors are designed for direct plug-in with TeSys series thermal relays. Compatibility with other thermal relay series is not guaranteed.
6. Operation
Once properly installed and wired, the AC contactor operates by energizing its coil. When the coil receives its rated control voltage, it creates an electromagnetic field that pulls the main contacts closed, allowing power to flow to the connected load. When the coil is de-energized, the spring mechanism quickly opens the contacts, disconnecting power to the load.
- Energizing the Coil: Apply the specified AC control voltage to terminals A1 and A2.
- De-energizing the Coil: Remove the control voltage from terminals A1 and A2.
The auxiliary contacts operate simultaneously with the main contacts and can be used for interlocking, signaling, or other control functions.
7. Maintenance
Regular maintenance helps ensure the longevity and safe operation of your contactor.
- Visual Inspection: Periodically inspect the contactor for any signs of physical damage, discoloration, loose connections, or excessive dust accumulation.
- Cleaning: Keep the contactor clean and free from dust and debris. Use a dry, lint-free cloth. Do not use solvents or abrasive cleaners.
- Terminal Tightness: Check and re-tighten all terminal connections as necessary to prevent overheating and arcing.
- Contact Wear: While designed for durability, excessive arcing or frequent operation under heavy loads can cause contact wear. If significant pitting or erosion is observed, consider replacement.
Always disconnect power before performing any maintenance.
8. Troubleshooting
If you encounter issues with your AC contactor, consider the following common problems and solutions:
- Contactor Does Not Pull In:
- Check control circuit voltage at A1/A2. Ensure it matches the coil rating.
- Verify control circuit wiring for breaks or loose connections.
- Inspect the coil for damage or open circuits. - Contactor Hums Excessively:
- Check for loose mounting screws.
- Ensure the armature is free to move and not obstructed.
- Verify that the coil voltage is stable and within tolerance. - Contactor Overheats:
- Check main circuit connections for looseness or corrosion.
- Ensure the load current does not exceed the contactor's rating.
- Verify proper ventilation around the contactor. - Contacts Weld Shut or Fail to Open:
- This indicates severe overload or short-circuit conditions. Immediately disconnect power and inspect the entire circuit. The contactor may need replacement.
If problems persist, consult a qualified electrician or contact customer support.
9. User Tips
No specific user tips were available from the provided customer reviews or Q&A data. However, general best practices for electrical components include:
- Always ensure the contactor's specifications (current, voltage) are appropriate for your application.
- Regularly check for loose wiring connections, as these can lead to overheating and failure.
- Consider using appropriate circuit protection (e.g., circuit breakers, fuses) upstream of the contactor to protect both the contactor and the connected load.
10. Warranty and Support
For warranty information, please refer to the terms and conditions provided by your point of purchase or the official Schneider Electric website. For technical support, troubleshooting assistance, or spare parts, please contact the seller or an authorized Schneider Electric service center.
