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The LC1G800KUEN is a 3-pole high-power contactor of Schneider Electric TeSys Giga Global Standard Version. It is the official successor to the high-current contactors of the original TeSys F series. It is mainly used for direct start and stop control of three-phase asynchronous motors, as well as switching control of high-capacity inductive and resistive loads.
This model adopts a wide-range AC/DC universal electronic coil, and comes standard with contact wear self-diagnosis and coil over/undervoltage monitoring functions to support predictive maintenance. Featuring compact size, high breaking capacity, long mechanical and electrical service life, it is widely applied in heavy-duty industrial sectors including metallurgy, mining, water treatment, HVAC, photovoltaic and energy storage.
- Model Code Breakdown
Full Model: LC1G800KUEN
- LC1: Basic product type, standard single-unit 3-pole contactor for AC loads on main circuits.
- G: Series code, TeSys Giga high-power contactor series.
- 800: Rated current rating. Rated operational current is 800A under utilization category AC-3 at 440V. 3-pole configuration (A digit “4” is added after the current rating for 4-pole models, e.g. LC1G8004KUEN).
- KU: Coil specification code, stands for 100~250V AC/DC wide-range low-power electronic coil.
- EN: Version code, Global Standard Version (international general version; domestically manufactured models are suffixed with “C”, e.g. LC1G800KUEC).
- Core Technical Parameters
3.1 Main Circuit Parameters
| Item | Specification |
| Poles & Contact Configuration | 3P, 3 Normally Open main contacts |
| Conventional Thermal Current (Ith) | 1050A (Ambient temperature ≤ 40℃) |
| Rated Operational Current (AC-1) | 1050A (≤1000V AC, ≤40℃); 800A (≤60℃) |
| Rated Operational Current (AC-3) | 800A (≤440V AC, ≤60℃) |
| Maximum Rated Operational Voltage (Ue) | 1000V AC |
| Rated Control Power (AC-3) | 400V: 450kW; 690V: 800kW; 1000V: 1000kW |
| Rated Breaking Capacity (AC-3 @ 440V) | 5870A |
| Rated Short-time Withstand Current (Icw) | 5.5kA / 10s |
| Rated Impulse Withstand Voltage (Uimp) | 8kV |
| Overvoltage Category | Category III |
| Rated Power Consumption per Pole (AC-3) | 130W |
| Main Circuit Connection | Front bolt connection, terminal spacing: 70mm |
3.2 Control Circuit Parameters
| Item | Specification |
| Coil Voltage Range (Uc) | 100~250V AC 50/60Hz; 100~250V DC |
| Normal Pick-up Voltage Range | 0.8Uc ~ 1.1Uc (Ambient temperature ≤ 60℃) |
| Drop-out Voltage Range | 0.1Uc ~ 0.45Uc (Ambient temperature ≤ 60℃) |
| Undervoltage Alarm Threshold | ＜80V (Below 80% of the minimum rated voltage) |
| Overvoltage Alarm Threshold | ＞275V (Above 110% of the maximum rated voltage) |
| Coil Type | Low-power wide-range electronic coil, AC/DC universal |
| Standard Auxiliary Contacts | 1NO + 1NC, compatible with 17V/1mA low-level PLC signals |
| Control Circuit Connection | Push-in terminals |
3.3 Mechanical & Environmental Parameters
| Item | Specification |
| Overall Dimensions (H × W × D) | 284mm × 211mm × 266mm |
| Net Weight | Approx. 14.2kg |
| Protection Class | IP20 on front side; optional terminal shroud for enhanced protection |
| Operating Ambient Temperature | -25℃ ~ +60℃ (No current derating within 60℃); Max. 70℃ (Current derating required) |
| Installation Altitude | No current derating up to 3000m |
| Mounting Method | Vertical bolt mounting, available for vertical installation in three quadrants |
| Certifications | IEC 60947-4-1, CE, UL, CSA, CCC, UKCA |
3.4 Service Life & Performance Parameters
| Item | Specification |
| Mechanical Life | 5,000,000 operating cycles |
| Electrical Life (AC-3) | 800,000 operating cycles |
| Maximum Operating Frequency | 500 cycles per hour |
| Standard Diagnostic Functions | Contact wear monitoring, coil over/undervoltage monitoring, control module self-diagnosis |
- Alternative Models & Cross-series Comparison
4.1 Same-brand Alternatives
- Replacement for Discontinued Models: Direct replacement for legacy TeSys F series LC1F780 and LC1F800. It is the official upgraded version with overall improved electrical performance. Installation hole positions require adaptation.
- Same Current Rating with Different Coils:
LC1G800EHEN: 48~130V AC/DC wide-range coil
LC1G800LSEN: 200~500V AC/DC wide-range coil
- 4-pole Version of Same Rating: LC1G8004KUEN (4-pole, rated 1050A under AC-1)
- Domestic Version: LC1G800KUEC (Manufactured domestically with identical parameters, suitable for local supply chains and certifications)
4.2 Equivalent Products of Other Brands
ABB: AF750-30-11 series contactor
Siemens: 3RT1276 series contactor
Chint: NXC-800 series contactor
> Note: Verify installation dimensions and terminal spacing for cross-brand replacement. Direct drop-in replacement is not recommended.
- Full List of TeSys Giga Global 3-pole Contactors (KU Coil)
| Model | Rated Current (AC-3 @ 440V) | Corresponding Motor Power @ 400V |
| LC1G115KUEN | 115A | 55kW |
| LC1G150KUEN | 150A | 75kW |
| LC1G185KUEN | 185A | 90kW |
| LC1G225KUEN | 225A | 110kW |
| LC1G265KUEN | 265A | 132kW |
| LC1G330KUEN | 330A | 160kW |
| LC1G400KUEN | 400A | 200kW |
| LC1G500KUEN | 500A | 250kW |
| LC1G630KUEN | 630A | 335kW |
| LC1G800KUEN | 800A | 450kW |
Common Accessories
Thermal Overload Relay: LR9G series (e.g. LR9G800), direct bottom mounting available
Auxiliary Contact Expansion: LAG8N113P (1NO+1NC), LAG8N203P (2NO)
Mechanical Interlock Module: LA9G970
Remote Wear Diagnostic Module: LA9GRD01 / LA9GRD10
Terminal Extension Kit: LA9G3102
- Application Scope & Environmental Limits
6.1 Typical Applications
- Motor Control: Direct start/stop of three-phase asynchronous motors for high-power fans, water pumps, compressors, conveyor lines and hoisting equipment.
- Power Distribution System: Switching of high-capacity feeder circuits and switching of reactive power compensation capacitor banks (capacitor-specific version required).
- New Energy Industry: Main circuits of high-power combiner cabinets in photovoltaic & energy storage power stations, front switches of PCS converters.
- Heavy-duty Industry: Control of high-capacity loads in metallurgy, mining, water treatment, data centers and other industries.
6.2 Environmental Requirements
For indoor installation inside switchgears only; outdoor exposed use is prohibited.
Pollution level: No higher than Class 3; no corrosive, explosive gas or conductive dust.
No severe vibration on mounting surface; vibration acceleration ≤ 10m/s².
Current derating is required if installation altitude exceeds 3000m or ambient temperature exceeds 60℃, refer to official manual for calculation.
- Troubleshooting Matrix
| Fault Phenomenon | Root Cause | Step-by-step Solutions |
| Contactor fails to pull in with no sound | 1. No power supply to control circuit or loose wiring | 1. Cut off power and verify safety; check wiring at terminals A1/A2 and re-measure control voltage |
| 2. Broken or burnt coil | 2. Test coil resistance with multimeter; replace coil if open circuit is detected | |
| 3. Mechanical jamming of armature | 3. Manually press armature after power-off, clean oil and dust on core pole faces | |
| 4. Supply voltage far below rated range | 4. Adjust power supply to rated range: 100~250V | |
| Repeated tripping after pull-in; indicator flashes twice | Coil undervoltage; continuous supply below 80V | 1. Measure real-time coil voltage, check cable voltage drop and contact resistance of upstream contacts |
| 2. Use larger gauge wires for control circuit and verify power capacity | ||
| Abnormal coil overheating; indicator flashes three times | Coil overvoltage; continuous supply above 275V | 1. Verify supply voltage level and eliminate wrong wiring to higher voltage |
| 2. Replace with 200~500V wide-range coil (LSE type) | ||
| Over 85℃ temperature rise at main terminals / contacts | 1. Loose wiring and excessive contact resistance | 1. Retighten connection bolts according to torque specifications after power-off |
| 2. Long-term load overload | 2. Measure load current, verify model selection and upgrade rating if necessary | |
| 3. Poor contact due to contact ablation | 3. Polish slightly ablated contacts; replace contact module for severe damage | |
| Indicator flashes once; contact wear alarm | Main contacts approaching end of electrical life; wear reaches warning threshold | 1. Read remaining service life via diagnostic function and prepare spare parts in advance |
| 2. Shut down equipment and replace main contact module to avoid contact welding | ||
| Abnormal auxiliary contact signal; no feedback to PLC | 1. Loose or ablated auxiliary contact module | 1. Check module installation and test on-off status after power-off |
| 2. Wrong wiring or broken cable | 2. Replace auxiliary contact module, recheck wiring and PLC input circuit | |
| Indicator flashes continuously | Internal hardware or software fault of control module | 1. Power cycle the contactor and check recovery |
| 2. Replace electronic control module or complete unit if fault recurs |
> Schneider official flashing code rule: 0.5s per cycle. Flash times correspond to different faults. Continuous flashing indicates internal failure of the control module.
The LC1G800KUEN is an 800A 3-pole high-power contactor from Schneider TeSys Giga series, designed for switching heavy-duty and high-reliability high-power loads, suitable for AC-3 motor loads and AC-1 resistive/distribution loads. Equipped with wide-range AC/DC coil, contact wear self-diagnosis, full-load operation at -25℃~60℃ and 500 operating cycles per hour, it is categorized into five major application fields as below:
- Direct Start & Stop of High-power Motors in Heavy Industry
As its core application, the 800A rated current under AC-3 corresponds to 450kW three-phase asynchronous motor at 400V and 800kW at 690V, ideal for industrial equipment with heavy starting load and continuous operation:
- Metallurgy & Mining: Large ball mills, jaw crushers, main exhaust fans for sintering plants, mine hoists and main motors of long-distance belt conveyors. Its wide temperature tolerance, high shock resistance and contact wear diagnosis effectively reduce unplanned downtime for dusty and high-temperature working conditions.
- Petrochemical Industry: Process compressors, high-pressure circulating pumps, large agitator motors for reaction kettles and raw material delivery pumps. The wide-range coil adapts to grid voltage fluctuation in factories; low power consumption cuts operating costs; PLC remote control ensures high reliability for continuous production.
- Cement & Building Materials: Main drive motors for rotary kilns, raw/cement mill main units and high-temperature kiln exhaust fans. Stable performance at 60℃ suits high-temperature areas around kilns, and long electrical life fits frequent start-stop operation.
- High-capacity Pump & Valve Systems for Municipal & Water Treatment
Its high reliability and diagnostic functions meet the requirements of unattended and long-term continuous operation for large pumps in municipal and water conservancy projects:
- Municipal Water Supply & Drainage: Main water pumps of large water intake and booster pumping stations (single motor power: 200~450kW), aeration blowers, sludge return pumps and main units of intake pump houses in sewage treatment plants. Wide-range coil copes with municipal grid fluctuation; contact wear warning realizes predictive maintenance and reduces manual inspection.
- Water Conservancy & Flood Control: Main unit control for large drainage pumping stations and inter-basin water transfer projects. High breaking capacity and long mechanical life guarantee reliable operation under emergency flood control conditions.
- Switching of High-capacity Circuits in Low-voltage Distribution Systems
With 1050A conventional thermal current under AC-1, this contactor acts as a high-capacity distribution switch for remote automatic control:
- Industrial Low-voltage Distribution: Remote switching of low-voltage bus couplers and large-capacity feeders in workshops to realize distribution automation; also used for main incoming power switching of large production lines for remote start/stop of the whole line.
- Reactive Power Compensation & Power Quality Management: Switching of large-capacity low-voltage capacitor banks (capacitor-specific contact module or current-limiting reactor required) for low-voltage reactive power compensation cabinets in steel plants, mines and data centers to dynamically adjust power factor.
- Critical Power Switching: UPS bypass circuits and diesel generator incoming switching in data centers and industrial control rooms. The AC/DC universal coil adapts to emergency power voltage fluctuation and ensures power continuity.
- High-power Circuit Control for New Energy & Energy Storage
It satisfies wide temperature range, high current and AC/DC compatibility requirements of new energy applications:
- Photovoltaic & Energy Storage Power Stations: Main circuits of centralized PV combiner cabinets, front AC main switches of energy storage PCS converters and general circuits of battery clusters. It supports cold start at -25℃ for outdoor stations in northern regions, and the wide-range coil is compatible with DC control power and AC auxiliary power on site.
- High-power Charging Facilities: Main incoming control of charging clusters for EV ultra-fast charging stations and power circuit switching of split charging stacks, capable of frequent switching under high current.
- Other Special Heavy-duty Applications
- Hoisting & Port Machinery: Main hoist and travelling motors of port portal cranes and large overhead travelling cranes. 500 cycles per hour matches frequent start-stop of hoisting work; mechanical interlock accessories enable safe control of forward/reverse rotation circuits.
- Large Industrial HVAC: Main compressors of centrifugal chillers, cooling water pumps and cooling tower fans in super-large commercial complexes, data centers and industrial plants, meeting start-stop and protection demands of high-power HVAC units.
- Marine & Shore Power Systems: Low-voltage main distribution circuits on ships and shore power connection switches at ports. Wide voltage range adapts to different shore power standards, and wide temperature design fits cabin and outdoor port environments.
Application Selection Tips
For special applications such as capacitor switching and DC loads, verify dedicated contacts and breaking capacity; standard motor-type contactor shall not be used directly.
Conduct current derating calculation in accordance with the manual if ambient temperature exceeds 60℃ or installation altitude exceeds 3000m.
