Schneider LC1G475KUEC 3‑Pole Contactor

3‑pole contactor from domestic TeSys Giga series, AC‑3 475A/440V, coil 100–250V AC/DC wide voltage, standard 1NO+1NC auxiliary contacts. Suitable for high‑power motor control and power switching. Supports contact wear diagnosis and can be used with LR9G series thermal relays.

1 Basic Parameters & Naming Explanation

2 Key Performance Data

3 Applications & Features

Applications

Direct starting, forward/reverse control, star‑delta starting of high‑power three‑phase asynchronous motors

Industrial power switching and distribution system control

Inductive load control with power factor ≥ 0.95

Heavy‑duty industries: building electrical, metallurgy, chemical, mining, etc.

Key Features

1. High performance: Up to 620A at AC‑3, 1050A at AC‑1 for heavy‑duty applications
2. Smart diagnosis: Built‑in contact wear detection for predictive maintenance
3. Wide‑voltage coil: 100–250V AC/DC reduces spare parts inventory
4. Modular design: Supports various accessories (aux contacts, mechanical interlock, surge suppressor, etc.)
5. Safe & reliable: Excellent arc extinguishing, suitable for harsh industrial environments

4 Mounting & Wiring Information

Mounting dimensions (China version LC1G475C)

Width: approx. 140mm

Height: approx. 270mm

Depth: approx. 150mm

Mounting: Standard 35mm DIN rail or screw mounting

Weight: approx. 10.6kg

Wiring requirements

1. Main circuit terminals: Suitable for copper/aluminum cables; crimping lugs recommended
2. Control circuit terminals: Suitable for 1.5–2.5mm² control cables
3. Clearance: ≥50mm left & right, ≥100mm top & bottom for proper heat dissipation

5 Accessory Compatibility & Matching Products

6 Cross‑Brand Alternatives

7 Installation & Commissioning Tips

1. Pre‑installation inspection

Verify model, rated parameters and control supply match

Check for physical damage, contact oxidation

Ensure flat mounting surface and secure rail

2. Installation steps

DIN rail: Align to 35mm rail, press firmly until locked

Screw mounting: Use M6 screws, torque 8–10N·m

Wiring: Main circuit first, then control circuit; observe terminal torque

3. Commissioning & testing

No‑load test: Apply control power; check smooth operation, abnormal noise

Load test: Run under load; monitor current, coil temperature

Aux contact test: Verify NO/NC switching and contact resistance

4. Maintenance recommendations

Regularly inspect contact wear; replace if wear >1mm

Clean arc chamber; remove dust and metal particles

Check coil insulation resistance ≥1MΩ

Retighten all terminals to avoid overheating

8 Selection Notes

1. Select contactor according to load type (AC‑3/AC‑4/AC‑1)
2. For motor control: Contactor rated current ≥ 1.1 × motor rated current
3. For frequent starting/reversing (AC‑4): Derate by 20–30%
4. For unstable control supply: Prefer wide‑voltage coil models
5. When used with thermal relay: Ensure matching ratings

Installation Manual – Schneider Domestic TeSys LC1G475KUEC 3‑Pole Contactor

Doc No.: DOCA0189ZH‑04 (based on official Schneider TeSys Giga installation guide)

Applicable model: LC1G475KUEC (domestic TeSys Giga 3‑pole contactor)

Version: January 2023

⚠️ Safety Warnings (Must Read)

1 Product Overview

1.1 Product Identification

Model: LC1G475KUEC

Series: Domestic TeSys Giga (LC1G)

Poles: 3P (3NO, 3‑pole normally open)

Rated current: AC‑3 475A (440V)

Coil voltage: 100–250V AC/DC (wide voltage)

Auxiliary contacts: 1NO+1NC standard

Standards: IEC 60947‑4‑1, GB/T 14048.4

Version: China version (suffix C; no UL certification)

1.2 Dimensions (Unit: mm)

2 Pre‑Installation Preparation

2.1 Tools

Phillips screwdriver (PH3)

Hex key (per fixing screw size)

Torque wrench (5–20N·m range)

Wire stripper (1.5–2.5mm² control & large main cables)

Crimping tool (for cable lugs)

Multimeter (coil resistance & insulation check)

Spirit level

2.2 Materials

Mounting plate (metal, thickness ≥3mm, flat, burr‑free)

M6 mounting screws (min. 4 pcs)

Cable lugs (for main circuit cables)

Control cable (1.5–2.5mm² copper)

Main cable (≥150mm² copper recommended)

Insulation tape / heat‑shrink tubing

Marker pen

2.3 Environmental Requirements

2.4 Product Inspection

1. Check packaging and transport damage
2. Verify model label (LC1G475KUEC)
3. Inspect contacts for oxidation, pitting, foreign matter
4. Manually actuate armature; check smooth operation
5. Measure coil resistance with multimeter
6. Test auxiliary contact switching

3 Installation Procedure (Surface Mounting)

Note: Domestic LC1G475KUEC supports surface mounting only; not for DIN rail.

3.1 Mounting Plate Drilling (Optional)

1. Mark holes at 100×120mm
2. Drill diameter: φ6.5mm (for M6)
3. Deburr after drilling

3.2 Hanging & Fixing

1. Hang: Locate bottom hanging holes onto mounting plate pins/screws
2. Preliminary fix: Hand‑tighten top M6 screws
3. Final fix: Torque all 4 screws to 3±0.3N·m (top‑down, diagonal)
4. Level check: Ensure inclination ≤30°

3.3 Accessory Installation (Aux Contacts / Mechanical Interlock)

1. Auxiliary contacts

Disconnect control power

Align and push into top slot until click

Verify secure locking

2. Mechanical interlock

Keep ≥50mm between two contactors

Mount interlock on sides

Adjust to prevent simultaneous closing

Test manually

4 Wiring Procedure

4.1 Pre‑Wiring Notes

1. Confirm all power disconnected
2. Main cables must use proper crimp lugs
3. Control cable strip length: ~8–10mm
4. Sequence: Main circuit first, then control

4.2 Main Circuit Wiring (3P, L1/L2/L3 → T1/T2/T3)

1. Open main terminal cover
2. Insert lugged cables
3. Torque:

Copper: 12±1N·m

Aluminum: 14±1N·m (with anti‑oxidant)

4. Securely tighten; check by gentle pull
5. Close terminal cover

4.3 Control Circuit Wiring (Coil A1/A2, Aux NO/NC)

1. Open control terminal cover
2. Coil:

A1: Control supply +/Line

A2: Control supply –/Neutral

3. Aux contacts:

NO: 13–14 (holding, indication)

NC: 21–22 (interlock, fault)

4. Control terminal torque: 2±0.2N·m
5. Close cover

4.4 Wiring Diagram

5 Mounting with Thermal Relay (LR9G475)

5.1 Direct Installation

1. Confirm matching: LC1G475KUEC + LR9G475
2. Align thermal relay to top slot
3. Push down until click
4. Check secure mounting
5. Connect pre‑installed busbars
6. Torque busbar screws: 8±0.8N·m

5.2 Wiring Notes

1. Main: Power → Contactor → Thermal relay → Motor
2. Control: Thermal relay NC (95–96) in series with contactor coil
3. Set thermal relay current to motor rated current

6 Commissioning & Testing

6.1 No‑Load Test

1. Apply control power (main open)
2. Check smooth closing, no abnormal noise
3. Verify aux contact switching
4. Check rapid opening
5. Repeat 3–5 times

6.2 Load Test

1. Apply main power
2. Start motor; check current within rating
3. Monitor coil temperature ≤60°C after 1h
4. Check terminal temperature ≤70°C (infrared)
5. Simulate overload; verify relay trip

6.3 Contact Wear Diagnosis (LC1G Feature)

1. Monitor via auxiliary contacts
2. Warning when wear >1mm
3. Replace contactor promptly

7 Maintenance & Service

7.1 Routine Inspection (every 6 months)

1. De‑energize; inspect for dirt, damage
2. Clean arc chamber (compressed air ≤0.3MPa)
3. Check contact resistance ≤500μΩ
4. Check coil insulation ≥1MΩ (500V megger)
5. Retighten terminals
6. Test operation

7.2 Replacement Schedule

7.3 Troubleshooting

8 Safety & Environment

8.1 Safe Disposal

1. Disconnect all power before scrapping
2. Remove all wiring
3. Separate metal & plastic for recycling
4. Contacts contain silver alloy; recycle as precious metal

8.2 Environmental Compliance

RoHS compliant; free of Pb, Hg, etc.

Plastic housing recyclable

Dispose per local regulations

9 Appendix – Technical Data