Schneider Electric LC1D18M7C – 18A 3-Pole AC Contactor | TeSys D Platform
Engineering Background
The TeSys D series is Schneider Electric’s globally deployed motor control contactor platform, engineered to IEC 60947-4-1 standards and trusted in industrial automation, HVAC, pump control, and machine tool applications across more than 100 countries. The LC1D18M7C is the 18A frame variant with a 220V AC (50/60 Hz) control coil — one of the most widely specified contactors in low-voltage motor starter assemblies.
Product Positioning
Designed for procurement engineers and panel builders who require a compact, DIN-rail-mountable contactor with proven field reliability, full IEC compliance, and broad accessory compatibility. The LC1D18M7C integrates seamlessly into TeSys D starter combinations with LRD thermal overload relays, LAD auxiliary contact blocks, and LAD suppressor modules.
Complete Technical Specifications
| Part Number / SKU | LC1D18M7C |
| Brand | Schneider Electric |
| Series / Platform | TeSys D |
| Rated Operational Current (AC-3) | 18 A |
| Motor Power @ 400V AC | 7.5 kW |
| Motor Power @ 220V AC | 4 kW |
| Poles | 3 (Main) + 1 NO Auxiliary |
| Control Coil Voltage | 220V AC, 50/60 Hz (M7C) |
| Coil Power Consumption (Inrush / Sealed) | ~70 VA / ~7 VA |
| Utilization Category | AC-3 (squirrel-cage motors) |
| Rated Insulation Voltage (Ui) | 690 V |
| Rated Impulse Withstand Voltage (Uimp) | 6 kV |
| Conventional Thermal Current (Ith) | 32 A |
| Mechanical Endurance | 10 million operations |
| Electrical Endurance (AC-3) | 1 million operations |
| Mounting | DIN rail (EN 60715) / screw |
| Terminal Type | Screw clamp, 1–10 mm² |
| Degree of Protection | IP20 (front face) |
| Operating Temperature | -40°C to +60°C |
| Standards | IEC 60947-4-1, EN 60947-4-1, UL 508, CSA C22.2 |
| Weight | ~1,210 g (with packaging) |
| Country of Origin | China (CN) |
Proven Application Environments
- Motor Starter Panels – Direct-on-line (DOL) and reversing starter assemblies for pumps, fans, and compressors up to 7.5 kW @ 400V
- HVAC Systems – Air handling units, chiller control panels, and cooling tower fan starters
- Machine Tools & Conveyors – Spindle motor control, conveyor drive switching, and automated production lines
- Water Treatment – Pump station motor control with frequent start/stop cycles
- Building Automation – Lighting control, elevator auxiliary circuits, and BMS-integrated motor switching
- OEM Panel Builders – Standard TeSys D footprint enables drop-in replacement across existing designs
Engineering Advantages
- IEC & UL Dual Certification – Accepted by inspection bodies globally; simplifies export compliance for machine builders
- Modular Accessory System – Compatible with LAD4 auxiliary contact blocks (up to 4 contacts), LAD8N surge suppressors, and LRD overload relays without rewiring
- Low Sealed-State Power – ~7 VA sealed coil consumption reduces panel heat load and energy cost in continuous-duty applications
- Compact DIN-Rail Footprint – 45 mm wide; enables high-density panel layouts
- Vibration & Shock Resistance – Rated to IEC 60068-2-6 for mobile and marine installations
- 10M Mechanical Cycle Life – Reduces maintenance intervals and total cost of ownership
System Architecture & Signal Flow
In a standard DOL motor starter, the LC1D18M7C sits between the upstream MCCB/fuse and the motor terminals. The 220V AC control circuit energizes the A1–A2 coil, closing the three main poles (L1/T1, L2/T2, L3/T3) and the integrated 1 NO auxiliary contact simultaneously. The auxiliary contact feeds back to the PLC digital input or pilot lamp circuit to confirm contactor closure. An LRD18 thermal overload relay mounts directly to the contactor’s lower terminals, providing motor protection without additional wiring. Surge suppressor LAD8N across A1–A2 clamps inductive kick and protects the control PLC output card.
Sourcing & Quality Verification
- OEM Traceability – Each unit ships with Schneider Electric original packaging, CE/UL markings, and batch traceability code
- Inspection Protocol – Konmask performs incoming coil resistance check, contact continuity test, and visual inspection on every unit before dispatch
- Counterfeit Risk Mitigation – Sourced exclusively from authorized Schneider Electric distribution channels; holographic label and QR verification available on request
- Shelf Life – Stored in climate-controlled warehouse; units dispatched within 24 months of manufacture date
Procurement Process
- Add to cart and complete checkout — or contact us for bulk/project quotation
- Receive order confirmation with estimated dispatch date (typically 1–3 business days)
- Shipment via DHL / FedEx / SF Express with tracking number provided
- Customs documentation (commercial invoice, packing list, CO if required) included
- Post-delivery technical support available via email or WhatsApp
Technical FAQ
Q: What does M7C in LC1D18M7C mean?
A: The suffix M7C designates the control coil voltage — 220V AC, 50/60 Hz. Other common suffixes: B7C = 24V AC, F7C = 110V AC, Q7C = 380V AC.
Q: Can LC1D18M7C be used for AC-4 (plugging/inching) duty?
A: The AC-4 rated current for the D18 frame is 9A. For heavy inching duty above 9A, step up to LC1D25 or LC1D32.
Q: Is this contactor compatible with LRD18 overload relay?
A: Yes. The LRD18 (12–18A range) clips directly onto the LC1D18M7C lower terminals — no adapter required.
Q: What auxiliary contact blocks are compatible?
A: LAD4 series (LAD4N01, LAD4N11, LAD4N20, LAD4N02) mount on the front face. Maximum 4 auxiliary contacts total.
Q: Can I use this on a 60 Hz grid?
A: Yes. The M7C coil is rated 50/60 Hz dual frequency.
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