ZLJ-400A/27 DC Contactor
ZLJ-400A/27 DC Contactor
ZLJ-400A/27 DC Contactor
ZLJ-400A/27 DC Contactor

ZLJ-400A/27 DC Contactor

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Product description

Product Description

The ZLJ-400A/27 DC contactor is designed for switching and controlling high-current DC power circuits. It is widely used in battery-powered vehicles, electric forklifts, electric winches, electric vehicles, excavators, automotive air-conditioning systems and communication power supplies.

Key Features

  • 400 A contact-switching capacity.
  • Single normally open contact configuration.
  • 16.5 W coil power consumption.
  • Silver-alloy contacts for reliable high-current switching.
  • Suitable for continuous-duty operation.
  • Compliant with RoHS requirements.
  • Suitable for telecommunications equipment, construction machinery, vehicles, trains, ships and UPS systems.

Technical Specifications

ItemSpecification
ModelZLJ-400A/27
Product TypeDC Contactor
Contact Configuration1H, SPST-NO
Contact MaterialSilver alloy
Rated Contact Load400 A × 48 VDC, resistive load, DC-1
Rated Coil Voltage27 VDC
Coil Power Consumption16.5 W
Coil Operating Voltage85%–110% of rated coil voltage
Pick-Up Voltage45%–70% of rated coil voltage
Drop-Out Voltage5%–40% of rated coil voltage
Starting Current at 27 VDC and 20°C≤5 A
Holding Current at 27 VDC and 20°C≤0.6 A
Contact Voltage Drop≤80 mV at 400 A
Insulation Resistance≥100 MΩ at 500 VDC
Dielectric Strength1,000 VAC, 50/60 Hz for 1 minute
Leakage Current During Dielectric Test<1 mA
Pick-Up Time≤30 ms
Release Time≤30 ms
Operating Temperature-25°C to +60°C
Storage Temperature-40°C to +65°C
Relative Humidity20%–90% RH
Vibration Resistance10–200 Hz, acceleration ≤3.5 g
Shock Resistance60–100 impacts/min, acceleration ≤4 g
Mechanical Life100,000 operations without load
Electrical Life6,000 operations at rated load
Pollution DegreeIII
Duty CycleContinuous duty

Model Number Identification

ZLJ-400A/27

  • ZLJ: Design code for a normally open DC contactor.
  • 400A: Rated current of 400 A under a DC-1 resistive load.
  • 27: Rated coil voltage of 27 VDC.

Example: ZLJ-400A/27 indicates a normally open DC contactor rated for a 400 A × 48 VDC resistive load, with a 27 VDC coil.

Typical Applications

  • Battery-powered vehicles
  • Electric forklifts and winches
  • Electric and hybrid vehicles
  • Excavators and construction machinery
  • Automotive air-conditioning systems
  • Telecommunication power supplies
  • Uninterruptible power supplies
  • Railway and marine electrical systems

Installation and Safety Precautions

  1. Tighten the main-circuit terminal screws and nuts to 10–13 N·m. Tighten the control-circuit terminal screws and nuts to 1–1.5 N·m.
  2. The coil-driving circuit must provide power equal to or greater than the required coil power. Insufficient power may reduce the contactor’s breaking performance.
  3. Do not continuously apply a coil voltage exceeding the maximum allowable value. Excessive voltage may cause abnormal coil heating and shorten insulation life.
  4. This contactor is not waterproof. Do not use it where water, solvents or oil may contact the housing or terminals. Exposure may cause housing deterioration, terminal corrosion, contamination or abnormal heating.

Drawing Note

The outline dimensions, mounting dimensions, model-identification graphics and circuit diagram use local computer paths and were not included in the supplied content. Please upload the original images separately if they need to be extracted.

尺寸（mm）

Dimension（mm）

未注尺寸公差（mm）

Tolerance grade not noted（mm）

0～30

±0.3

30～60

±0.5

60～100

±1

大于100

±2

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