Schneider LC1D18 TeSys‑D 3‑Pole Motor Contactor, 18A AC‑3 Rated Industrial DIN‑Rail Contactor

The Schneider LC1D18 is a robust three-pole power contactor from Schneider’s proven TeSys-D series, engineered for low-voltage motor control and medium-heavy load switching in industrial environments. Equipped with one normally open and one mirror-type normally closed auxiliary contact, this sturdy switching component serves as a core control unit for standard cabinet automation and power distribution systems. It is widely deployed in mechanical processing, HVAC ventilation, water treatment and medium-scale automated production facilities worldwide.

Built to handle stable medium-heavy industrial operating loads, the Schneider LC1D18 features an 18A AC-3 rated operational current, perfectly matching the control demands of common high-power three-phase asynchronous motors. Adopting industrial-grade flame-retardant housing and reliable screw-clamp terminal structure, this contactor delivers outstanding mechanical stability and strong environmental adaptability. It is regularly used to operate large industrial fans, high-flow water pump units, medium-sized conveyor lines, automated packaging equipment and various medium-heavy power processing machinery.

Schneider LC1D18 TeSys‑D 18A Three‑Pole Industrial Motor‑Switching Contactor

1. Mechanical Structure, Installation and Environmental Adaptability

Compact Footprint and Flexible Mounting Options

Maintaining a practical compact industrial casing, the Schneider LC1D18 features dimensional specifications of 45mm width, 77mm height and 95mm depth, with a net weight of just 0.49kg. It supports two universal installation methods: standard DIN rail mounting and direct screw panel fixing, allowing flexible and neat layout in limited cabinet spaces. This space-efficient design suits OEM equipment assembly and standardized industrial cabinet configuration perfectly. With front IP20 protection grade, the unit effectively prevents accidental contact with live internal terminals and blocks external dust accumulation, ensuring safe, trouble-free and long-term stable operation in regular industrial workshop environments.

Shock and Vibration Resistance with Broad Temperature Tolerance

The LC1D18 adopts premium UL94-V1 flame-retardant plastic housing that resists 850°C high-temperature combustion, offering solid defense against daily mechanical vibration, instantaneous impact shock and long-term thermal aging. Its control coil sustains full-power stable operation across -40°C to 60°C without current derating, and supports conditional operation up to 70°C with reasonable load adjustment. Highly adaptable to diverse industrial conditions, it operates steadily in 5% to 95% non-condensing humidity environments and works reliably at installation altitudes up to 3000 meters above sea level, fully complying with global industrial environmental standards.

2. Electrical Parameters and Switching Performance

Main Circuit Rated Electrical Specifications

Configured with three normally open main power poles, the Schneider LC1D18 delivers an 18A AC-3 operational current at 440V, with a maximum thermal steady-state current of 32A under 60°C ambient temperature. It features a 690V rated insulation voltage and 6kV impulse withstand voltage, strictly conforming to IEC 60947-4-1 international industrial safety regulations. In actual industrial application, this contactor stably drives 7.5kW three-phase motors at 380/440V and supports 10kW motor operation under 500–690V power supply. Its superior inrush current resistance effectively absorbs instantaneous motor startup surges and frequent medium-heavy load impacts, maintaining consistent operational stability for mid-range high-power industrial equipment.

Auxiliary Contact Configuration and Service Lifespan

Integrated with one NO and one mechanically interlocked NC mirror auxiliary contact, the LC1D18 enables real-time equipment running status feedback, electrical interlock setup and practical safety loop control for automated systems. It achieves 30 million mechanical operation cycles and 1.65 million electrical switching cycles under standard AC-3 load conditions, ensuring durable service life for continuous medium-heavy production equipment. Designed with universal screw-clamp terminals compatible with both solid and flexible copper wires, the recommended tightening torque is 1.7N·m for control circuits and 2.5N·m for main power circuits to guarantee firm, anti-vibration wiring connection for long-term operation.

3. Certification Standards and Industrial Application Scenarios

Global Certifications and Anti-Interference Performance

Fully compliant with IEC 60947-4-1, UL 60947-4-1 and CSA C22.2 NO 14 international industrial norms, the LC1D18 holds multiple authoritative global certifications including CCC, UKCA, EAC, UL and marine certification. The built-in coil surge suppression structure eliminates electromagnetic interference generated during coil de-energization, effectively protecting surrounding low-voltage control modules and precision circuit components. A complete lineup of AC coil voltage options covers nearly all mainstream control voltage specifications for global industrial automation and HVAC mechanical equipment.

Industrial Application Scope

Widely applied in medium-load industrial automation, building power control and HVAC systems, the LC1D18 undertakes stable start-stop control for large industrial ventilation units, high-flow water pump stations, medium-sized conveyor production lines, heavy-duty packaging machinery and medium-power air compressors. When paired with thermal overload relays, it forms an integrated motor control and protection assembly for standard PLC control cabinets. Supporting a maximum switching frequency of 3600 cycles per hour, it adapts to frequent startup-shutdown working modes and supports long-term unattended stable operation of medium-heavy industrial processing equipment.

Schneider LC1D18 Optional Voltage Suffix Models: LC1D18B7C, LC1D18CC7C, LC1D18D7C, LC1D18E7C, LC1D18F7C, LC1D18M7C, LC1D18P7C, LC1D18Q7C, LC1D18U7C

LC1D18 Full Suffix Voltage Parameter List

All 7C-series suffix models support 50/60Hz dual-frequency operation, compatible with global industrial power supply standards:

• LC1D18B7C: AC 24V control coil voltage, 50/60Hz

• LC1D18CC7C: AC 36V control coil voltage, 50/60Hz

• LC1D18D7C: AC 42V control coil voltage, 50/60Hz

• LC1D18E7C: AC 48V control coil voltage, 50/60Hz

• LC1D18F7C: AC 110V control coil voltage, 50/60Hz

• LC1D18M7C: AC 220V control coil voltage, 50/60Hz (most widely used industrial specification)

• LC1D18P7C: AC 230V control coil voltage, 50/60Hz

• LC1D18Q7C: AC 380V control coil voltage, 50/60Hz

• LC1D18U7C: AC 240V control coil voltage, 50/60Hz