Product Overview

The Schneider Electric LC1G400EHEN TeSys Giga Contactor is a high-power switching device designed for industrial electrical distribution and motor-control applications. As part of the TeSys Giga range, it is engineered to switch electrical circuits in demanding operating environments, including industrial motor starters, large machinery, and power-control panels.

A contactor is an electrically controlled switching device that uses a control circuit to operate its main contacts. When the coil and electronic control assembly receive a suitable control signal, the contactor changes the state of its main contacts, allowing a connected load to be energized or disconnected. This enables automated equipment to control high-current circuits through a dedicated control system.

The LC1G400EHEN features three normally open main poles and supports AC-3 motor-control applications with a rated operational current of 400 A at up to 440 V AC. For AC-1 applications, its conventional operational current rating reaches 550 A under specified conditions. These ratings serve different utilization categories and must not be treated as interchangeable.

The model uses a wide-range 48–130 V AC/DC control supply. Its auxiliary contact configuration is 1 normally open and 1 normally closed, allowing the contactor’s state to be incorporated into suitable control and indication circuits.

The TeSys Giga platform also incorporates an electronic control design intended to support dependable switching and reduced control-coil energy consumption. Depending on the overall installation, the contactor can be used with overload protection, circuit breakers or fuses, PLC control, and motor monitoring equipment.

For procurement and replacement projects, the full catalog number is important. The LC1G400EHEN should not be confused with other LC1G400 variants, because related models may have different control-voltage ranges, auxiliary features, or configurations.

Technical Specifications

Note: Electrical ratings depend on the utilization category, operating voltage, ambient conditions, and installation requirements. The supplied dimensions and weight are retained as listing values; verify the exact unit and packaging configuration before finalizing the product listing.

Function and Working Principle

The LC1G400EHEN uses an electrically controlled mechanism to open and close its main contacts. Its control circuit allows an automation system or operator command to control a power circuit without directly switching the main load current through a small control device.

1. Electromagnetic Switching

When the contactor receives an appropriate control signal within its specified voltage range, the internal control assembly actuates the switching mechanism. The three normally open main contacts close, allowing current to flow through the connected circuit.

When the control signal is removed or the control system commands the contactor to release, the mechanism returns to its open state. The connected circuit is then interrupted, subject to the contactor’s application and switching limits.

The contactor must be selected according to the load type and expected switching duty. Motor starting and stopping can impose different electrical stresses from switching a resistive load.

2. Three-Pole Main Contact Operation

The three main poles are designed to switch a three-phase circuit. In a typical motor-control installation, each pole is connected in series with one phase conductor.

When the contactor closes, all three poles provide the intended connection to the load. When it opens, the main contacts disconnect the load according to the device’s rated operating conditions.

Correct wiring, terminal tightening, protective-device coordination, and compliance with the manufacturer’s installation instructions are essential for safe operation.

3. Electronic Control and Wide-Range Coil Supply

The LC1G400EHEN uses a 48–130 V AC/DC control circuit. This broad control-voltage range allows the contactor to work with compatible control supplies without requiring a single narrowly defined coil voltage.

The actual control signal must remain within the specified operating limits. Control-system designers should consider voltage drop, supply stability, wiring length, and the control circuit’s available current capacity.

The electronic control design also supports reduced holding-power consumption compared with conventional high-power coil arrangements, subject to the manufacturer’s stated conditions.

4. Auxiliary Contact Feedback

The built-in auxiliary contacts provide additional switching signals for suitable control and monitoring circuits.

The normally open auxiliary contact can be used in an indication or interlocking circuit, while the normally closed auxiliary contact can provide an alternative status signal. Their actual use depends on the control design and the contactor’s operating state.

Auxiliary contacts should not automatically be treated as safety-rated feedback. Safety functions require an appropriate architecture and components selected for the required safety performance.

5. Switching and Protection Coordination

A contactor performs switching; it does not replace every protective function in a motor-control system. Overload relays, circuit breakers, fuses, ground-fault protection, and other protective devices may be required according to the installation.

The contactor, protection devices, motor, and wiring should be selected as a coordinated system. This is particularly important for high-current applications, where fault energy and thermal stress can be substantial.

Role in Industrial Control Systems

The LC1G400EHEN can act as a power-switching component in an industrial control cabinet. It is commonly integrated with motor starters, PLC-based control systems, overload protection, and operator interfaces.

PLC Integration

A programmable logic controller can issue a command to operate the contactor through an appropriate control circuit. The PLC may coordinate motor operation with pressure switches, temperature sensors, limit switches, process interlocks, or production sequences.

Because the LC1G400EHEN uses a 48–130 V AC/DC control circuit, the PLC output should not be connected directly unless its electrical characteristics are compatible. In many installations, an interposing relay or a suitable interface circuit is used between a low-voltage PLC output and the contactor control input.

The control arrangement should be designed to meet the machine’s operating and safety requirements.

Motor Starter Assemblies

In a motor starter, the contactor provides the switching function while a suitable overload relay or motor-protection device addresses overload and fault conditions.

The correct combination depends on the motor’s rated current, starting method, duty cycle, prospective short-circuit current, and applicable electrical standards.

For high-power motors, engineering verification is especially important because incorrect coordination can lead to excessive contact wear, nuisance trips, or inadequate fault protection.

HMI and Operator Control

A human-machine interface can provide start and stop commands, operating status, and alarm information through a PLC or suitable control circuit.

The contactor itself does not provide a full process display. Its auxiliary contacts can contribute to status feedback, but the system designer must distinguish a contactor command from verified equipment operation. A closed contactor does not necessarily prove that the motor is rotating or that the process is functioning correctly.

Electrical Distribution and Power Control

In suitable installations, the LC1G400EHEN can switch high-current circuits in industrial power-control panels. Its use must remain within the applicable voltage, current, utilization-category, and short-circuit coordination ratings.

A contactor should not be used as a substitute for an isolating device where a suitable means of isolation is required by the installation design or electrical regulations.

Industrial Applications

1. Large Industrial Motor Control

The contactor is designed for demanding motor-control duties, including appropriately rated three-phase motors. In a motor starter, it switches the motor circuit in response to commands from the control system.

Motor selection must consider rated current, starting current, switching frequency, operating temperature, and the required utilization category. The 400 A AC-3 rating is not a universal rating for every motor or operating condition.

2. Industrial Pumps

Large pumping systems in manufacturing plants and process facilities may use contactors as part of their motor starter assemblies.

The contactor can enable the pump motor to be switched by the process-control system. Pump protection, dry-run monitoring, pressure control, and overload handling require additional devices or control logic as appropriate.

3. Fans and Ventilation Systems

Industrial ventilation and air-handling installations may use high-power contactors to switch compatible motor circuits. The control system can start or stop equipment in response to operating schedules, environmental conditions, or process demand.

Where variable-speed operation is required, a contactor may be used in a system that also includes a variable frequency drive, but the switching arrangement must follow the drive manufacturer’s requirements. Contactors should not be switched at the drive output arbitrarily.

4. Industrial Compressors

Large compressor installations can use contactors within motor-control assemblies, depending on the compressor design and motor-starting method.

The complete system may include overload protection, pressure monitoring, emergency-stop circuitry, and control interlocks. Compressor-specific starting requirements must be reviewed before selecting the contactor and associated components.

5. Manufacturing and Process Equipment

The LC1G400EHEN may be used in suitable industrial machines, production lines, and auxiliary power systems where high-current switching is required.

Its suitability depends on the electrical load, operating frequency, environmental conditions, and protection design. Engineers should verify the utilization category rather than selecting a contactor based only on its headline current rating.

Installation and System Integration

Correct installation is essential for contact reliability, thermal performance, and safe operation.

1. Verify the Control Voltage

Before connecting the control circuit, confirm that the available supply is compatible with the specified 48–130 V AC/DC range.

Check the control circuit’s voltage under operating conditions, including potential voltage drop and fluctuations. Ensure that any PLC interface or interposing relay is appropriate for the contactor’s control input.

2. Confirm Main-Circuit Ratings

Verify the operating voltage, load current, utilization category, and expected switching duty. For motor applications, use the AC-3 rating and relevant motor data rather than relying solely on the higher AC-1 thermal current rating.

Protective devices should be selected according to the manufacturer’s coordination tables and the installation’s prospective fault current.

3. Mounting and Panel Layout

The supplied product dimensions are 226 × 225 × 140 mm. Confirm these measurements against the manufacturer’s dimensional drawing for the exact version before planning the mounting plate or cabinet.

Provide sufficient space for power cables, control wiring, ventilation, inspection, and maintenance. Follow the specified mounting orientation and clearance requirements.

The panel must also account for the heat generated by the contactor and adjacent components. High-current terminals and conductors should be arranged to avoid unnecessary thermal buildup.

4. Main and Auxiliary Wiring

Connect the three main poles according to the manufacturer’s terminal markings and the approved circuit diagram. Use conductors, cable lugs, and terminal hardware rated for the application.

Auxiliary contacts should be wired according to their terminal identification and the control-system logic. Verify contact states during commissioning rather than relying on assumptions about terminal numbering.

Tightening torque and conductor preparation must follow the product installation instructions.

5. Protective Devices and Interlocks

Provide suitable short-circuit and overload protection. The contactor should be coordinated with the selected protective devices and motor characteristics.

Where an emergency stop or safety-related function is required, implement it through a properly designed safety circuit. A standard contactor and a single auxiliary contact do not automatically provide a complete safety function.

6. Commissioning and Testing

Before energizing the equipment, inspect the wiring, verify control voltage, confirm protective-device ratings, and check all terminal connections.

Test the contactor’s pickup and release behavior, auxiliary-contact feedback, interlocks, and control-system response. Verify that the contactor operates within the expected sequence and that connected equipment responds correctly.

Record the final wiring arrangement and control settings for future maintenance.

Compatible System Components

The LC1G400EHEN is typically part of a larger motor-control or power-switching assembly. Compatibility depends on electrical ratings and the design of the complete installation.

These components are examples of equipment that may be used in an installation. They are not necessarily included with the contactor.

Alternative Models and Replacement Considerations

When replacing the LC1G400EHEN, compare the full catalog number and electrical characteristics. Models in the same product family can have different control-voltage ranges, contact configurations, or accessory requirements.

Before approving a replacement, compare:

• Main-contact pole count and configuration.
• AC-1 and AC-3 current ratings.
• Rated operational voltage.
• Control circuit voltage and operating limits.
• Auxiliary-contact configuration.
• Short-circuit coordination requirements.
• Mounting dimensions and terminal layout.
• Control-system and interlocking requirements.
• Environmental and operating conditions.

A contactor with a higher current rating is not automatically a suitable replacement. Its control voltage, application category, physical dimensions, and protective-device coordination must also be appropriate.

Key Advantages

High-Current Switching Capability

The LC1G400EHEN provides a 400 A AC-3 rating under specified conditions, making it suitable for selected high-power motor-control applications.

Wide-Range Control Voltage

Its 48–130 V AC/DC control circuit supports a range of compatible control supplies, helping engineers design suitable control interfaces.

Three-Pole Main Contacts

The three normally open main poles support switching of compatible three-phase circuits.

Auxiliary Contact Feedback

The 1 NO + 1 NC auxiliary contact arrangement supports appropriate status indication and interlocking circuits.

Electronic Control Design

The TeSys Giga control design supports efficient operation of the contactor’s control circuit under the manufacturer’s specified conditions.

Industrial Control Integration

The contactor can be incorporated into motor starters, PLC-controlled systems, and industrial electrical panels when used with suitable protection and control components.

Maintainability

Clear catalog-number identification and suitable system documentation can simplify inspection, replacement planning, and industrial maintenance.

Technical FAQs

1. What is the Schneider Electric LC1G400EHEN?

It is a high-power three-pole contactor from the TeSys Giga range, designed for power switching and industrial motor-control applications.

2. What is its AC-3 rated current?

The specified AC-3 rated operational current is 400 A at up to 440 V AC, subject to the applicable operating conditions.

3. What is the AC-1 current rating?

The specified AC-1 current rating is 550 A under the manufacturer’s stated conditions. AC-1 and AC-3 ratings apply to different load characteristics and should not be interchanged.

4. What control voltage does it use?

The LC1G400EHEN uses a 48–130 V AC/DC control circuit. Confirm the actual control-supply voltage and limits before installation.

5. How many main and auxiliary contacts does it have?

It has three normally open main poles and an auxiliary contact arrangement of one normally open and one normally closed contact.

6. Can it be controlled by a PLC?

Yes, if the PLC output and interface circuit are designed for the contactor’s control requirements. A low-voltage PLC output may require an interposing relay or another suitable interface.

7. Does the contactor provide overload protection?

The contactor’s primary function is switching. Appropriate overload and short-circuit protection must be selected for the motor and installation. Do not assume that the contactor alone provides complete motor protection.

8. Can it be used for all 400 A loads?

No. Its suitability depends on the utilization category, operating voltage, load characteristics, switching frequency, ambient temperature, and protective-device coordination.

9. What should be checked before purchasing a replacement?

Confirm the complete model number, current and voltage ratings, control voltage, auxiliary contacts, physical dimensions, condition, and included accessories. For critical equipment, request appropriate testing and documentation.

10. Is the listed weight of 7 kg the shipping weight?

The supplied listing weight is 7 kg. Actual net and packaged weights can differ, so verify the measurement basis with the supplier before arranging transport or calculating freight costs.

Procurement and Maintenance Recommendations

When sourcing the Schneider Electric LC1G400EHEN, verify the full catalog number and compare it with the label on the existing device. Confirm the 400 A AC-3 rating, 48–130 V AC/DC control range, three-pole main-contact configuration, and 1 NO + 1 NC auxiliary contacts.

For new or unused inventory, check the product’s condition, packaging, and included accessories. For used or refurbished units, request clear photographs of the nameplate and terminals, information about the testing performed, and applicable warranty or return terms.

During maintenance, isolate the electrical supply and follow the site’s electrical safety procedures before inspection. Check terminals, conductors, contactor mounting, signs of overheating, and the condition of the connected control circuit. Any replacement of components or adjustments must follow the manufacturer’s instructions.

If a contactor shows signs of excessive contact wear, overheating, unstable operation, or repeated failure, investigate the underlying cause. Incorrect load selection, poor terminal connections, unsuitable control voltage, excessive switching frequency, or inadequate protective-device coordination may contribute to premature failure.

For replacement projects, confirm that the new unit fits the panel and is compatible with the existing control system. Changes in control voltage or auxiliary-contact configuration may require wiring or PLC-program modifications.

Conclusion

The Schneider Electric LC1G400EHEN TeSys Giga Contactor is a high-power switching device designed for industrial power control and motor-control applications. Its three normally open main poles, 400 A AC-3 rating, 550 A AC-1 rating under specified conditions, and 48–130 V AC/DC control circuit make it suitable for selected demanding installations.

For reliable operation, engineers should verify the utilization category, motor and load requirements, protective-device coordination, control voltage, and mounting conditions. Accurate model identification and correct integration with the wider control system are essential when purchasing, installing, or replacing this contactor.