Schneider LC1D18M7 AC Contactor

Série: TeSys D (TeSys Deca), import model (without suffix-C)

Décodage du modèle

LC1D: Série TeSys D 3-contacteur AC pôle

18: Rated operational current 18A under AC-3 utilization category

M.: Coil voltage AC220V

7: Coil frequency 50/60Hz universal

LC1D18MC: Domestic-manufactured version; LC1D18M7: Overseas/imported version. Fully pin-to-pin compatible and interchangeable.

Spécifications électriques de base

Terminal Assignment

Circuit principal: L1(1-1), L2(3-2), L3(5-3); T1(2-1), T2(4-2), T3(6-3)

Bobine: A1, A2 → AC220V power supply

Auxiliaire: 13-14 (NON Normalement Ouvert), 21-22 (NC normalement fermé)

Sélection & Remplacement

1. Direct compatible domestic equivalent: LC1D18M7C (Local production, identical footprint, current and coil rating, widely used in projects)
2. Variantes de tension de bobine:

LC1D18B7: AC24V

LC1D18F7: AC110V

LC1D18Q7: AC380V

3. Domestic compatible alternatives: CJX2-1810 (1NON), CJX2-1801 (1Caroline du Nord), CJX2-1811 (1NON+1NC) matches the auxiliary-contact configuration of this model.

Applications typiques

Direct-on-line switching of 3-phase motors, les fans, pompes à eau, compresseurs, Systèmes CVC, low-voltage switchgear, star-delta starters, bandes transporteuses; Standard AC-3 motor loads; Up to 32A for AC-1 resistive loads.

Dépannage & Notes d'entretien

1. Judge coil integrity by measuring resistance across A1-A2. Operating coil voltage shall remain within 0.8-1.1 × 220 V; Undervoltage causes chattering.
2. Auxiliary contacts rated max.5A, for control-signal circuits only. Do not switch power loads.
3. Tighten terminals to 1.7 N·m. Insufficient torque leads to overheating and burnt terminals.

Domaines d'application de Schneider LC1D18M7 AC Contactor

LC1D18M7 is a TeSys-D 3-pole 18A contactor, rated for 7.5 kW@400 V under AC-3 with AC220 V 50/60 Hz coil. It is widely deployed in industry, services du bâtiment, HVAC and OEM equipment.

1. Machines industrielles & Équipement

Direct start-stop control for 3-phase asynchronous motors: bandes transporteuses, mélangeurs, broyeurs, petites pompes, compresseurs d'air, ventilateurs.

Machine-tool equipment: Tours, fraiseuses, machines d'emballage, printing equipment for main-circuit switching.

Star-delta starting circuits, motor-reversing circuits. Can be paired with thermal overload relays for motor overload protection.

Automation control cabinets: PLC outputs drive contactor coils to switch high-power loads.

2. CVC (Chauffage, Ventilation and Air-Conditioning)

Central air-conditioning units, cabinet fans, cooling-tower fans, circulating water pumps.

Fresh-air handling and exhaust systems, building electromechanical switch rooms.

AC220 V coil variants such as LC1D18M7 are extensively used in HVAC installations.

3. Building Services & Distribution d'énergie

Factory power panels, compact low-voltage distribution cabinets.

Water supply & drainage: Pompes à eaux usées, pompes de surpression, drain-pump control.

Centralised lighting control (Max.32 A AC-1 resistive), switching for high-power heating elements and resistive loads.

4. Levage & Entreposage Logistique

Small hoisting mechanisms, systèmes de convoyeurs, matériel de tri.

Not suitable for heavy jog-lifting duty cycles (Select higher-endurance contactors for frequent jogging).

5. OEM Complete-Set Equipment

Used as standard component by machinery manufacturers: food-processing machines, auxiliary injection-moulding equipment, environmental-protection and water-treatment systems.

Limites des applications (Scénarios inappropriés)

1. Not intended for DC main-circuit switching (DC-type contactor required).
2. Avoid extremely frequent jogging / fonctionnement à cycle élevé, which drastically shortens electrical service life.
3. 1NO+1NC auxiliary contacts are limited to control-level signals (max.5 A). Never carry main power loads.

Common Matching Accessories

Protection contre les surcharges: LRD series thermal overload relays

Auxiliary-contact expansion: Blocs de contacts auxiliaires LADN

Coil surge suppression: LADRC surge suppressors to reduce electromagnetic interference