Schneider LC1D18M7 AC Contactor

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

Decodarea modelului

LC1D: TeSys seria D 3-contactor AC poli

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.

Specificații electrice de bază

Terminal Assignment

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

Bobina: A1, A2 → AC220V power supply

Auxiliar: 13-14 (NU Deschis normal), 21-22 (NC normal închis)

Selecţie & Înlocuire

1. Direct compatible domestic equivalent: LC1D18M7C (Local production, identical footprint, current and coil rating, widely used in projects)
2. Coil voltage variants:

LC1D18B7: AC24V

LC1D18F7: AC110V

LC1D18Q7: AC380V

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

Aplicații tipice

Direct-on-line switching of 3-phase motors, fani, pompe de apa, compresoare, sisteme HVAC, low-voltage switchgear, star-delta starters, benzi transportoare; Standard AC-3 motor loads; Up to 32A for AC-1 resistive loads.

Depanare & Note de întreținere

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.

Application Fields of 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, servicii de constructii, HVAC and OEM equipment.

1. Utilaje industriale & Echipamente

Direct start-stop control for 3-phase asynchronous motors: benzi transportoare, mixere, polizoare, pompe mici, compresoare de aer, ventilation fans.

Machine-tool equipment: Strunguri, mașini de frezat, utilaje de ambalare, 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. HVAC (Încălzire, 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 & Distribuția energiei

Factory power panels, compact low-voltage distribution cabinets.

Aprovizionare cu apă & drenaj: Pompe de canalizare, booster pumps, drain-pump control.

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

4. Ridicare & Depozitare logistică

Small hoisting mechanisms, sisteme de transport, echipamente de sortare.

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.

Limitări de aplicare (Scenarii nepotrivite)

1. Not intended for DC main-circuit switching (DC-type contactor required).
2. Avoid extremely frequent jogging / high-cycle operation, 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

Protectie la suprasarcina: LRD series thermal overload relays

Auxiliary-contact expansion: LADN auxiliary contact blocks

Coil surge suppression: LADRC surge suppressors to reduce electromagnetic interference