SCHNEIDER LC1D18BL Contactor DC24V

SCHNEIDER · TeSys D · Magnetic Contactor · 24VDC Coil · In stock

What Is the SCHNEIDER LC1D18BL Contactor?

The SCHNEIDER LC1D18BL is an 18-amp magnetic contactor from the Schneider Electric TeSys D series, with a 24V DC coil. It is designed for switching motor loads up to 7.5 kW (at 400V AC-3) and is commonly found in motor starters, control panels, HVAC compressor circuits, pump controllers, and industrial automation cabinets. The "BL" suffix identifies the 24V DC coil variant and the specific terminal configuration.

In short: This is a genuine Schneider Electric TeSys D 3-pole contactor rated 18A AC-3 with a 24V DC coil. It is the standard choice for motor control up to 7.5kW in industrial panels where the control system operates on 24V DC logic — typical of PLC-driven automation.

Understanding the LC1D18BL's Place in the TeSys Family

TeSys D Contactor Range Overview

The LC1D series spans from LC1D09 (9A) through LC1D150 (150A) and beyond. The LC1D18 sits near the entry level of the range, suitable for small to medium three-phase motors. Key characteristics: 3 main poles (NO), built-in coil surge suppression on DC variants, auxiliary contact mounting slots (for adding LADN/LADR contact blocks to get additional NO/NC contacts), and DIN rail or screw mounting.

AC-3 vs. AC-1 Rating — Know the Difference

The 18A AC-3 rating means this contactor can start and stop a squirrel-cage motor drawing up to 18A full-load current. The AC-1 rating (for resistive or slightly inductive loads like heaters) is higher — typically 25-32A for this frame size. If you are switching a resistive heating load, you can use a higher current. If you are switching a motor, use the AC-3 rating. Never exceed the AC-3 rating for motor loads — the inrush current during motor starting is already accounted for in the AC-3 classification.

Key Specifications

Frequently Asked Questions

How do I know if this contactor is a genuine Schneider product?

Genuine Schneider TeSys contactors have a laser-etched or molded nameplate on the side with the complete part number (LC1D18BL), manufacturing date code, and Schneider's quality marks. The coil terminals are clearly marked A1 and A2. The main power terminals are numbered 1/L1, 3/L2, 5/L3 (line side) and 2/T1, 4/T2, 6/T3 (load side). Counterfeit contactors often have inconsistent font, missing date codes, or terminals that do not follow the L1-L2-L3 / T1-T2-T3 numbering convention. Every product we ship is sourced through Schneider's authorized supply chain.

Can I use a 24V AC coil instead of the 24V DC version?

No. The coil is wound specifically for DC operation — applying 24V AC to a DC coil will cause the contactor to chatter, overheat, and eventually burn out the coil. Conversely, a 24V DC supply will not properly energize an AC-rated coil because the AC coil's impedance is designed for alternating current. Always replace a contactor with the same coil voltage type (AC or DC) and the same rated voltage. If your control circuit has been changed from AC to DC or vice versa, you need the corresponding contactor variant.

What auxiliary contacts can I add to this contactor?

The LC1D18BL accepts Schneider LADN (front-mount) and LADR (side-mount) auxiliary contact blocks. LADN11 adds 1NO+1NC, LADN20 adds 2NO, LADN02 adds 2NC, and LADN22 adds 2NO+2NC. These snap onto the front of the contactor without tools. For time-delayed auxiliary contacts, use the LADT series pneumatic timers. For low-level signal switching (PLC inputs), use the LADN series with gold-flashed low-level contacts. We can supply these auxiliary blocks — include them in your BOM when requesting a quote.

The contactor is humming — is it failing?

A DC-coil contactor should not hum during operation. Humming is characteristic of AC coils experiencing shading coil failure or armature face contamination. If a DC contactor is producing noise, check: (1) the coil voltage is stable 24V DC without excessive ripple (if using a rectified AC supply, ripple can cause vibration), (2) the armature faces are clean and free of debris or rust, and (3) the contactor is mounted securely to a flat surface. If the noise persists after these checks, the contactor should be replaced.

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