Schneider Electric (Square D) LC1D18G7 Contactor

The Schneider Electric (Square D) LC1D18G7 Contactor is a high-performance 3-pole IEC contactor engineered for demanding motor control and resistive load applications. As a core component of the TeSys Deca series, this non-reversing 18-amp model features a 120V AC 50/60Hz coil and is optimized for industrial reliability. With a 10 HP rating at 480V AC (3-phase), it provides high SCCR (short circuit current rating) of up to 100kA when part of an approved motor circuit. This unit is the recognized direct replacement for 037H004123, though field technicians should note that existing accessories, including auxiliary switches and suppression modules, must be upgraded to ensure total system compatibility. Each unit comes standard with integrated 1 NO and 1 NC auxiliary contacts, facilitating seamless integration into established control loops. Designed for longevity in harsh environments, it supports an operational life of up to 15 million mechanical cycles and features IP20 finger-safe screw terminals and standard 35mm DIN rail mounting for rapid enclosure deployment.

Key Benefits

• Enhanced Compatibility: Serves as a drop-in Schneider Electric contactor crossover for the legacy 037H004123 model.
• Robust Signal Logic: Includes factory-installed 1NO/1NC built-in auxiliary contacts to eliminate the need for immediate add-on blocks in basic motor starter circuits.
• High Thermal Rating: Supports 18A AC-3 (inductive) and 32A AC-1 (resistive) loads at voltages up to 440V AC.
• Efficient Installation: Utilize the technical standard of TeSys Deca screw clamp terminals for secure, vibration-resistant wiring.

Common Questions

Is the LC1D18G7 compatible with legacy Square D auxiliary switches?
No. While the contactor is the direct replacement for 037H004123, peripheral accessories like aux blocks and suppressors utilize the modern TeSys D mounting architecture. You must replace existing accessories with TeSys Deca compatible modules.

Can this contactor be rotated or mounted horizontally?
This unit is designed for vertical mounting on a standard 35mm DIN rail or a flat backplate. Significant deviation from vertical alignment can affect the magnetic field of the 120Vac coil and decrease mechanical life.

What is the maximum horsepower this contactor can handle for a 3-phase motor?
For standard industrial 3-phase applications, the LC1D18G7 is rated for 5 HP at 230V, 10 HP at 460V, and up to 15 HP at 575V AC.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.

LC1D18G7 is the cross for XTCE015B10A