Schneider LC1D38M7C Contactor

Full Standard Model: LC1D38M7C, TeSysD (Deca) 3polo Contactor de CA, Domestic Chinese Standard Version

Decodificación de código modelo

⚠️ Do NOT abbreviate as LC1D38C. Coil codes such as M7/Q7/B7 must be included. The same 38A base unit supports multiple coil voltage options.

Parámetros eléctricos básicos

Circuito principal: 3polo, 3NO; 38A (AC3); Max.50A for AC1 resistive loads; máx.. operational voltage 690 V

Compatible motor rating (400 V, AC3): 18.5 kW for directonline starting

Builtin auxiliary contacts: 1NO(1314)+1CAROLINA DEL NORTE(2122)

Bobina: AC220 V, 5060 Hz; Pickup voltage:70120%uc; Dropout voltage:0.30.6uc

Resistencia mecánica: 20 million cycles; Resistencia eléctrica (AC3): approx.2 million cycles

Montaje: DINrail mounting / Screwon plate mounting; EverLink screw terminals

Temperatura de funcionamiento:5 ℃～+60 ℃; máx.. altitud:3000 m

Definición de terminal

1. Circuito principal: L1L2L3 for power input; T1T2T3 for motor/load connection
2. Bobina: A1, A2 for control voltage (220 V AC)
3. Contactos auxiliares:1314 (NormallyOpen NO); 2122 (NormallyClosed NC)

Common Coil Variants for the Same Base Unit

LC1D38B7C: AC24 V coil

LC1D38F7C: AC110 V coil

LC1D38Q7C: AC380 V coil

LC1D38M7C: AC220 V coil (most widelyused)

Selección & Evitar trampas

1. SuffixC denotes domestic CCCcertified version. For NorthAmerican export projects, select import models without suffixC (with UL certification).
2. Expandable accessories: LADN auxiliary contact blocks, LADT timedelay modules, LADR mechanical interlocks, directplugin LRD33 series thermal overload relays.
3. No apto para: Frequent inching operation (300 ciclos/hora), or environments with corrosive gas. Select heavyduty series for such conditions.

Practical Application Cases for Schneider LC1D38M7C (TeSysD,38A,AC220V Coil)

Core capability: Control max.18.5 kW 3phase motor under 400 V AC3; Max.50A for AC1 resistive loads; Builtin 1NO+1NC auxiliary contacts; AC220 V 50/60 Hz coil; Domestic CCCcertified; DINrail mountable.

Case 1: Circulating Coolingwater Pump for Factory (Tratamiento de agua / climatización)

Load parameters: 3phase coolingpump motor,400 V,15 kilovatios; rated current approx.2830 A; servicio continuo; several startstop cycles per day

Electrical configuration: LC1D38M7C + LRD3353 thermal overload relay (2332 A) + moldedcase circuitbreaker

Lógica de control: 220 V signal output from PLC / temperature controller energizes contactor coil for automatic temperaturelinked startstop; Builtin 1NO auxiliary contact feeds runningstatus feedback signal to PLC.

Selection justification: Motor rated current approaches 30 A; 38 A contactor provides sufficient margin for starting inrush current. Suits highhumidity pumphouse environment (5~+60 ℃). EverLink antiloosening terminals prevent overheating faults.

Nota: For pumphouses with heavy condensation, install cabinet dehumidifier; never mount in openair conditions.

Case 2: Mainmotor Directonline Starting for Aircompressor (Machining Workshop)

Load parameters: Screwtype aircompressor motor,400 V,18.5 kilovatios, DOL start; auto startstop triggered by pressure switch.

Electrical configuration: LC1D38M7C fitted with plugin LRD3355 thermal relay (3040 A); Coil terminals A1/A2 connected to AC220 V output of compressor control panel.

Lógica: Contactor pullsin to start main motor at lower pressure threshold; deenergizes for shutdown at upper pressure threshold; 1NC auxiliary contact outputs faultalarm signal.

Boundary condition: Suitable only for ordinary screw compressors with ≤300 operating cycles per hour. Not recommended for highcycle reciprocating piston compressors (rapid degradation of electrical servicelife).

Case 3: Belt Conveyor for Automated Productionline (Embalaje / Industria Logística)

Load parameters: Conveyor drive motor 15 kW 400 V; forwardreverse operation required.

Electrical configuration: Twooff LC1D38M7C + LADR mechanical interlock accessory + LRD33 thermal relay for reversible (forwardreverse) circuito.

Logic description: Mechanical interlock physically prevents simultaneous closure of both contactors, eliminating 2phase shortcircuit risk. Builtin auxiliary contacts implement interlock logic and drive runningstatus indicator lamps.

Field benefit: Mechanical endurance of 15 million cycles supports thousands of daily productionline operations. Modular accessories clipon without tools; cabinet wiring simplified for easy maintenance and replacement.

Cae 4: Escape / Dustremoval Fan System for Largesize Workshop (climatización & Environmentalprotection)

Load parameters: Centrifugal dustextraction fan motor,18.5 kW 400 V; longduration continuous running; firealarmlinked emergency shutdown.

Configuración: LC1D38M7C with LRD3355 thermal relay; 220 V control circuit; passive drycontact fireshutdown signal wired in series with coil loop at terminal A1.

Función: PLCdriven fan startstop under normal operation; firealarm signal cuts coil supply to force immediate fan shutdown.

Selection tip: Large fan inrush current demands derated application of 38 A model instead of 32 A, mitigating contact ablation risk.

Case 5: Resistiveload: Industrial Oven Heating Circuit (AC1 Utilization Category)

Load parameters: 3phase heatingelement total power 33 kW 400 V resistive load; operating current approx.48 A (LC1D38 max. rating 50 A under AC1).

Configuración: LC1D38M7C plus circuitbreaker protection. Thermal overload relay is omitted (heating circuits are protected by temperaturecontroller and circuitbreaker).

⚠️Hardlimit warning: Operating close to 50 A upper bound. Derating is mandatory for ambient temperature 50 ℃. Continuous fullload operation at 50 A is forbidden.

Case 6: Maincircuit Contactor within StarDelta Starter Circuit (Injectionmolding Machine / Pump Station)

Carga: 18.5 kW motor stardelta starting. Mainline contactor adopts LC1D38M7C; Starconnection and Deltaconnection contactors can be LC1D25M7C.

Key point: Mainline contactor carries fullload current and must be rated 38 A. LADseries pneumatic timer modules implement stardelta timingsequence switching.

Summary of Selection Pitfalls for LC1D38M7C

1. ✅Applicable: Directonline starting, forwardreverse switching, mainline for stardelta starters for general 3phase asynchronous motors; AC1 resistive loads. máx.. operating rate 3600 cycles/hour, ≤300 cycles/hour recommended for extended servicelife.
2. ❌Not applicable: Frequent inching (e.g.press machinery), AC4 heavyduty plugreversing duty; corrosivegas or unprotected openair environments; NorthAmerican export projects (suffixC lacks UL approval).
3. Thermal Overload Relay Matching Table

Instalación & Maintenance Manual for Schneider LC1D38M7C (TeSysD Deca), Fieldoperational Version

Compiled from official Schneider TeSysD documentation, applies to domestic CCCcertified LC1D38M7C. All installation and service work shall be executed by qualified electricians. Poweroff and voltageverification shall be completed prior to any work.

1. Información básica del producto

Modelo: LC1D38M7C, 3contactor de CA de polo; AC3 rating 38 A; máx.. motor rating 18.5 kW @400 V

Bobina: AC220 V 50/60 Hz; Builtin auxiliary contacts:1NO(1314)+1CAROLINA DEL NORTE(2122)

Resistencia mecánica:15 million cycles; AC3 electrical endurance:approx.2 million cycles; máx.. operating frequency: 3600 ciclos/hora, ≤300 cycles/hour recommended

Entorno operativo:5 ℃～+60 ℃; Altitude ≤3000 m; Pollution Degree 3; Condensation, corrosive fume and heavydust environments are prohibited.

2. Instalación

2.1 Two permissible mounting methods

1. 35 mm DINrail mounting (Privilegiado)

Hook bottom latch over upper edge of DINrail; press downwards until audible click confirms locking. For removal: Pull down bottom release latch and lift unit upwards.

2. Screwon plate mounting

Use M4 screws. Elongated mounting holes on rear face for ACcoil version: Hole spacing 35 mm(horizontal) ×6070 mm(vertical adjustable). Mounting surface must be vertical. Maximum allowable tilt ±5°. Horizontal or inverted installation is strictly forbidden.

🔥Cooling clearance: Maintain ≥10 mm freespace on top, bottom and both sides. Avoid mounting adjacent to heatgenerating components (relés térmicos, variablefrequency drives). Derate performance for hightemperature inside enclosed cabinets.

2.2 Especificación de cableado & Par de apriete (Crítico; loose connections cause terminal overheating & burnout)

Wiring definition:

L1/L2/L3: 3phase power supply input; T1/T2/T3: connect to motor or load

A1/A2: AC220 V coil control supply, nonpolarized for AC circuits

1314: NormallyOpen NO; 2122: NormallyClosed NC, for latching, interlock and statusfeedback circuits

⚠️Hardlimit prohibitions:

1. Never insert multistrand flexible wire without ferrule crimping.
2. Overtorquing will crack terminal housing; undertorquing causes overheating and oxidation.
3. Do not reverse maincircuit connections: Supply must connect to Lside, load to Tside.

2.3 Prepoweron commissioning steps

1. Visual inspection: No cracks on enclosure; arcchamber cover intact without damage; no metallic debris trapped inside contactor.
2. Apply AC220 V only to coil terminals A1A2 (maincircuit highvoltage disconnected). Perform 510 onoff cycles. Confirm crisp pullin and dropout action without persistent abnormal noise.
3. Verify auxiliarycontact onoff sequence matches drawing logic.
4. Proceed to energize maincircuit only after full confirmation.
5. Optional Accessory Installation
6. Auxiliary contact block LADN: Clipon to top face without tools.
7. Pneumatic timedelay head LADT: Topmounted for stardelta timing control.
8. Mechanical interlock LADR: Installed between two LC1D38 units for forwardreverse circuit, provides hardphysical interlock to prevent phaseshortcircuit.

Nota: Maintain complete enclosure after accessory fitting; never operate with arcchamber cover removed.

4. Maintenance Procedure (All work requires poweroff and voltageverification)

4.1 Routine Online Inspection (A diario / pershift, visual observation only, no disassembly)

1. Acoustic check: Normal operation yields crisp click only. Persistent loud buzzing indicates coreassembly fault.
2. Thermal measurement via infrared thermometer: Enclosure temperature rise ≤40 K; Terminal surface temperature must not exceed 85 ℃. Immediate shutdown required for local discoloration or overheating.
3. control visual: No blackening or scorchmarks on housing; No discoloration or tracking on terminals; No heavy dust accumulation inside cabinet.

4.2 Scheduled Maintenance Interval

Forbidden practice: Do not flush contactor with liquid cleaner or solvent. Use only dry compressedair (pressure ≤0.3 MPa) or dry cotton cloth for cleaning.

4.3 Servicelife Endoflife Replacement Criteria

⚠️LC1D38 is an integrated unit. Individual maincontact replacement is prohibited. Replace the whole unit upon contact ablation. No spareparts for contacts are available.

Mandatory fullunit replacement upon occurrence of any belowlisted conditions:

1. Cracked or burntthrough arcchamber cover; Carbonized / blackened housing.
2. soldadura por contacto: Maincircuit remains conducting after coil deenergization.
3. Severe buzzing noise persists even after coresurface cleaning.
4. Coil resistance deviates ±15 % from nominal value; Resistencia de aislamiento <1 MΩ.
5. Operating cycles approach 15 million mechanical cycles or 2 million AC3 electrical cycles.
6. Troubleshooting Table

6. Safety Hardlimit Prohibitions
7. ❌Never remove arcchamber cover under live condition. Operation without arcchamber cover is strictly forbidden.
8. ❌Do not strike contactor housing to release welded contacts.
9. ❌Not suitable for AC4 frequent plugreversing or highfrequency inching duty.
10. ❌Do not run continuously at full rating above +60 ℃ ambient; derating required for hightemperature.
11. ❌Domestic suffixC version has no UL certification; disqualified for NorthAmerican export projects.
12. ❌Disassembly of contactor housing for internal repair is prohibited. Faulty units must be replaced entirely.
13. Official PDF Manual Access
14. Visit SchneiderElectric official document library, search partnumber: LC1D38M7C, download 《TeSys Deca Contactor Installation Instruction》;
15. Request fullset catalogue documentation from Schneider authorized distributors.