Eaton XTCG018C00AO Eaton-Moeller AC Contactor

Note: The last character is letter O, not digit 0; belongs to XTCG sub-series of Eaton XT-range IEC contacteurs.

Décodage du code modèle

Full definition: 3-pôle, AC-3 18A, no-built-in auxiliary contacts, Bobine AC220V, screw-terminal AC contactor.

Paramètres électriques de base

Physique & Conditions environnementales

Housing width: 45 mm

Température de fonctionnement:-25℃ ~ +60℃, condensation and icing forbidden

Température de stockage:-40℃ ~ +85℃

Poids: environ. 0.21 kilos

Scénarios d'application typiques

1. Three-phase motor start-stop control (≤7.5kW @400V motor)
2. Ventilateurs, pompes à eau, convoyeurs, compresseurs d'air, machines d'emballage
3. CVC & cabinet OEM assembly; can be paired with XTOD thermal overload relay for motor overload protection

List of Compatible Accessories

Auxiliary contact block: XTCGXFAC (1NO+1NC etc.), monté sur le côté

Relais de surcharge thermique: XTOD018 (0.1-18A motor protection coverage)

Mechanical interlock module: XTCG-MV, for reversing circuit

Suppresseur de surtension: RC / varistor module for coil side

Direct-Replacement Models & Notes de remplacement

1. Same-series alternative: XTCG018C00DT (different coil code; verify coil voltage, not a drop-in replacement)
2. Cross-series alternative: XTCE018C00A0 (Eaton XTCE series, functionally equivalent; check accessory compatibility)

⚠️Pitfall reminder: XTCG018C00AO has no onboard auxiliary contacts. External auxiliary-contact accessory must be fitted if PLC feedback signals are required, otherwise control circuits cannot function.

Non-Applicable Operating Conditions

Switching frequency＞1200 cycles/hour

Heavy corrosive gas / heavy dust environment without proper protection

DC-coil applications (this unit is AC-coil type)

Brief Wiring Instructions

1. Circuit principal: L1-L2-L3 supply side; T1-T2-T3 load (moteur) côté
2. Coil terminals A1/A2 connect to AC220V
3. No built-in auxiliary contacts; all logic feedback signals shall be obtained from externally fitted auxiliary-contact accessories.

XTCG018C00AO (Frame C) Montage & Dimensions hors tout (Unité: mm)

All XTCG-C frame models (009-032UN) share identical housing dimensions. Supports DIN35 rail mounting AND screw-on back-plate mounting.

Dimensions hors tout (without fitted accessories)

Overall dimension: 45(W) × 85(H) × 97.4(D) mm

Screw-on back-plate cut-out dimensions (DIN rail unused, direct screw-fix onto cabinet back-plate)

Horizontal mounting-hole centre-to-centre spacing: 35 mm

Vertical mounting-hole centre-to-centre spacing: 76 mm

Fastener hole diameter: Φ4.5 (Vis M4)

Hole-to-edge margin: approx.4.5 mm top & bas.

DIN Rail Installation Information

1. Standard DIN-35-7.5 rail (universal electrical 35 mm rail)
2. Back-side snap-in clip for direct rail-clip mounting; tool-free assembly & disassembly.

⚠️Dimension change after accessory installation

1. Side-mount auxiliary-contact block XTCGXF: width increases by 10 mm, total width 55 mm
2. Bottom-mount thermal overload relay XTOD: overall height increases by approx.42.5 mm
3. Mechanical interlock XTCG-MV: two contactors side-by-side with zero gap; total width = direct sum (45+45=90 mm)

Installation Boundary Conditions

1. Cooling clearance: ≥10 mm top & bas; no mandatory clearance side-to-side (multiple units may be mounted adjacent to each other)
2. Do not mount tightly against closed cabinet partitions; ambient temperature-25℃~+60℃, condensation prohibited.
3. Maximum permitted conductor size: main circuit 6 mm²; coil circuit 2.5 mm².

Cross-model reference

Models XTCG009C / XTCG025C / XTCG032C share identical housing, cut-out and rail-mount dimensions; only internal contact current rating differs. Varied coil voltage codes (AO/DT etc.) produce no change in physical dimensions.

Operating Voltage Differentiation for Eaton XTCG018C00AO

Two separate voltage systems exist for contactors: circuit principal (principaux interlocuteurs) and coil control circuit. Do not confuse them.

1. Tension de commande de bobine (suffix code AO)

Coil rated voltage: AC 220V 50/60Hz

Terminaux: A1, A2

Permissible coil operating voltage range: 0.85~1.1×Ue, c'est à dire. AC187V ~ AC242V

⚠️This is an AC coil. DC supply is strictly forbidden.

2. Circuit principal (main contacts for motor loads)

The 18A AC-3 rating is specified at 400V. Main circuit can operate within 0-690V AC; allowable current varies with applied voltage.

Key Supplementary Notes

1. Suffix code `AO` exclusively denotes AC220V coil. Changing suffix code (par exemple. DT=AC380V) only alters coil voltage; main-circuit voltage capability remains unchanged.
2. Voltage outside permitted coil operating range causes faults: undervoltage → pull-in failure / chattering; overvoltage → coil overheating & épuisement professionnel.
3. Main-circuit current derating applies at elevated ambient temperatures.

XTCG018C00AO Coil Troubleshooting Guide

Coil specification: AC220V 50/60Hz; Terminals A1/A2; permissible operating range AC187V-242V; DC supply prohibited.

Faute 1: Contactor does not pull-in at all, zero acoustic response

Probable Root-Causes

1. No voltage on control circuit: 0V measured across A1/A2; upstream relay / Sortie API / fusible / fil cassé / loose terminal.
2. Coil supply voltage below 0.85Ue (＜187V): insufficient voltage for pull-in.
3. Coil open-circuit burnout: infinite resistance reading between A1-A2 via multimeter.
4. Mechanical seizure: foreign-object ingress, corroded iron-core, mis-fitted add-on accessories causing mechanical jamming.

Remedial Steps

1. Power-off safety confirmation; measure live voltage across A1/A2 terminals.
2. Mise hors tension; disconnect coil wiring; measure DC resistance of coil standalone. Typical resistance of C-frame AC220V coil: 1300-1500 Ω. Infinite resistance = burned-open coil; near-zero resistance = short-circuited coil.
3. Manually actuate contactor armature; verify smooth movement. If sticking, remove foreign debris; inspect fit of auxiliary-contact / interlock accessories.
4. Verify continuity of control-circuit fuse, PLC outputs and intermediate relays.

Faute 2: Contactor chatters / loud buzzing noise, unstable pull-in

Probable Root-Causes

1. Marginal low coil voltage; long-run / thin-gauge control wiring creates excessive voltage drop.
2. Iron-core mating surfaces contaminated with oil, dust or iron-particles; enlarged magnetic air-gap.
3. Supply-waveform distortion, harmonic distortion caused by VFD interference.
4. Degraded coil with partial turn-to-turn short-circuit.

Remedial Steps

1. Live measurement of A1/A2 voltage; must stay within AC187-242V. Increase control-cable cross-section for long-distance control loops.
2. Mise hors tension; clean iron-core mating surfaces of iron-dust and debris. Do NOT apply lubricant grease or oil.
3. Mesurer la résistance de la bobine; significantly-lower-than-nominal resistance indicates turn-to-turn short-circuit; replace full contactor unit.
4. Fit RC-type coil surge suppressor in case of severe electromagnetic interference.

Fault3: Coil persistent overheating / rapid burnout

Probable Root-Causes

1. Wrong supply voltage: AC380V applied to AC220V coil — most frequent burnout cause.
2. Continuous supply voltage＞1.1Ue (＞242V), long-term over-voltage operation.
3. Mechanical jamming prevents full armature closure; large residual air-gap keeps coil current high continuously.
4. Accidental DC power supply to AC coil: instant burnout.

Remedial Steps

1. Double-check actual supply voltage; match AO-coded AC220V coil rating strictly.
2. Verify free mechanical movement; confirm full armature closure.
3. Confirm AC-only supply; never drive with DC source.

Burnt-out coil: XTCG-series coils are non-field-replaceable individually. Replace complete contactor assembly.

Fault4: Contactor fails to release after de-energization (stuck closed)

Distinguish main-contact welding versus coil residual-voltage / mechanical-seizure non-release.

1. Residual voltage persists across A1/A2 after coil de-energization (PLC leakage current, residual voltage from parallel indicator lamps).
2. Mechanical seizure; return-spring fatigue.
3. Main-circuit short-circuit event resulting in welded main contacts.

Remedial Steps

1. Measure residual voltage across de-energized A1/A2. Residual＞30V prevents release; fit RC snubber for voltage dissipation.
2. Disconnect main-circuit power; test manual return-action of mechanism. Replace unit if spring failure occurs.
3. Inspect main-contacts for burn-welding. Welded contacts require full-unit replacement; do not refurbish by polishing contacts for continued service.

⚠️Hard-forbidden Operations

1. Never apply DC voltage to AC220V AC-coil; instant burnout risk.
2. Do not short-circuit terminals A1/A2 for test purposes.
3. Do not repeatedly apply power to already-burned coil; secondary cabinet-damage risk.
4. Never apply oil / grease onto iron-core mating surfaces; oil traps ferrous dust and causes buzzing / stuck-closed failure.

Quick-Reference Test Matrix

Supplementary note: No auxiliary contacts built-in. External side-mount auxiliary-contact block XTCGXF is mandatory for status feedback signals.