Request a Quote for High-Voltage Components&Equipment

Tell us your requirements — rated voltage, model, quantity, and destination — and our XBR Electric team will prepare a detailed quotation within 24 hours.
Contact Form Demo
Specialized Industrial Series

Low Voltage Vacuum Contactors (1.14kV) & Solid Insulated Series

XBRELE delivers specialized switching solutions for harsh environments. Featuring the CKJ Series for 1140V mining networks (AC-4 Duty) and the LZNJ Series with solid-embedded poles for maintenance-free 12kV operation in dust and humidity.

1.14kV Low Voltage 12kV Solid Pole Mining Ready Up to 3200A
Series Overview

Reliable Low Voltage Vacuum Contactors for Mining & Industry

This specialized portfolio targets applications where standard medium-voltage contactors may not fit. We offer two distinct categories to address specific industrial challenges:

1. Low Voltage Series (CKJ & LCZ3): Designed for 1.14kV (1140V) and 2kV networks common in mining and heavy industrial drives. With rated currents extending up to 3200A, these low voltage vacuum contactors are perfect for controlling large motors in soft-starter cabinets and oilfield equipment.

2. Solid-Insulated Series (LZNJ): A 12kV vacuum contactor featuring Solid-Embedded Poles. By encapsulating the vacuum interrupter in epoxy resin, the LZNJ series offers superior resistance to dust, moisture, and vibration, making it the ultimate choice for polluted environments like cement and steel plants.

For our complete range of switching solutions, visit the Vacuum Contactor pillar page .

Technical Specifications

Detailed Product Data & Dimensions

Select a category below to view full technical parameters for our 1.14kV Mining, 2kV High Current, and 12kV Solid-Insulated series.

1. CKJ Mining Series (1.14kV)
2. LCZ High Current Series (1.14kV / 2kV)
3. LZNJ Solid-Insulated (12kV)
CKJ5 1.14kV Mining Contactor
CKJ5 Series: Standard 1.14kV mining vacuum contactor (1000A/1250A).

CKJ Series: 1.14kV Mining Specialists

Engineered for 1140V underground mining networks. Capable of handling AC-4 duty cycles (frequent inching/plugging) common in mining machinery.

1.14kVMining ReadyAC-4 Duty

Technical Parameters: CKJ Series (1.14kV)

No.ItemUnitCKJ5-1.14CKJ20-1.14CKJ1-1.14
1Rated VoltagekV1.141.141.14
2Rated CurrentA1000, 1250630, 800160
3Vacuum Fracture WithstandV700060006000
4Power Freq. WithstandV420042004200
5Rated Breaking Capacity–5kA8Ie (25 times)8Ie (25 times)
6Rated Making Capacity–6.3kA10Ie (100 times)10Ie (100 times)
7Short-time WithstandkA6.36.3 (10Ie)1.6 (10Ie)
8Peak WithstandkA1616 (25Ie)4 (25Ie)
9Overload WithstandkA9.459.452.4 (15Ie)
10Short Circuit Break/Close––10Ie (1 time)10Ie (1 time)
11Rated Contact Gapmm3±0.52.5±0.52±0.5
12Overtravelmm≥1.5≥1.5≥1
13Closing Synchronismms22–
14Mechanical Life10⁴505050
15Electrical Life (AC3 / AC4)10⁴25 / 1025 / 1025 / 10

Outline Dimensions

CKJ5 Dimensions
Dimensions for CKJ5 series.
Get Quote for Mining Contactors
LCZ3 3200A High Current Contactor
LCZ3-3200: 2kV / 3200A ultra-high current contactor.

LCZ High Current: Industrial Powerhouses

Designed for heavy industrial drives and soft starters requiring high current capacity (up to 3200A) at voltages of 1.14kV and 2kV.

2kV3200A MaxHeavy Industry

Technical Parameters: LCZ Series (High Current)

No.ItemUnitLCZ3-3200LCZ3-2000LCZ1-1.14
1Rated VoltagekV221.14
2Rated CurrentA32001600, 20001600, 2000
3Vacuum Fracture WithstandV10000100007000
4Power Freq. WithstandV420042004200
5Rated Breaking Capacity–2.5Ie (AC2)4Ie (AC2)4Ie (AC2)
6Rated Making Capacity–4Ie (AC2)4Ie (AC2)4Ie (AC2)
7Overload WithstandkA101010
8Rated Contact Gapmm3.5±0.53.5±0.53.5±0.5
9Overtravelmm222
10Closing Bouncems222
11Closing Timems––60
12Opening Timems––40
13Mechanical Life10⁴505050
14Electrical Life (AC2)10⁴252525

Outline Dimensions (LCZ LV Series)

LCZ3 3200A Dimensions
Dimensions for LCZ3-3200 (3200A).
Get Quote for High Current Contactors
LZNJ 12kV Solid Embedded Pole Contactor
LZNJ Series: 12kV Solid-Embedded Pole vacuum contactor.

LZNJ Series: Solid-Embedded Pole (12kV)

The LZNJ series features a maintenance-free solid insulation structure. Vacuum interrupter is embedded in epoxy resin for superior protection.

12kVSolid EmbeddedMaintenance Free

Technical Parameters: LZNJ Series

No.ItemUnitLZNJ-12/630
1Rated VoltagekV12
2Rated CurrentA630
3Power Freq. WithstandkV42
4Lightning ImpulsekV75
5Rated Breaking CapacityA8Ie (25 times)
6Rated Closing CapacityA10Ie (100 times)
7Short-time WithstandkA6.3 (10Ie)
8Peak WithstandkA16 (25Ie)
9Peak Current Times2
10Rated Contact Gapmm5.5±0.5
11Overtravelmm1.5
12Main Circuit ResistanceμΩ≤80
13Closing/Opening Timems≤60 / ≤40
14Mechanical Life10⁴30 (300,000)
15Electrical Life (AC3 / AC4)10⁴25 / 10

Outline Dimensions

LZNJ Dimensions
Installation drawing for LZNJ-12 Solid Pole Contactor.
Get Solid Pole Quote
Designed for Resilience

Features for Mining & Harsh Environments

From the dusty depths of mines to humid industrial plants, XBRELE’s specialized contactors are built to endure conditions where standard equipment fails.

Solid Technology

Embedded Pole (LZNJ)

The LZNJ series uses epoxy resin to completely encapsulate the vacuum interrupter, isolating it from the external environment.

  • Pollution Proof: Fully protected against dust, humidity, and condensation.
  • Shock Resistant: Rigid structure absorbs external mechanical impact and vibration.
  • Maintenance Free: No cleaning of insulators required over the operational lifespan.
Mining Ready

1.14kV Mining Capability (CKJ)

Specifically rated for 1140V networks, bridging the gap between standard LV (690V) and MV (3.3kV) for underground equipment.

  • Heavy Duty AC-4: Capable of frequent inching and plugging operations common in mining conveyors.
  • Compact Size: Designed to fit into space-constrained mining flameproof enclosures.
  • Safe Switching: No exposed arc, ideal for potentially explosive environments.
High Power

High Current Handling (LCZ3)

For massive industrial motors and drives, we offer specialized solutions handling up to 3200A at 2kV voltage levels.

  • 3200A Rating: Supports large-scale industrial pumps, fans, and steel mill drives.
  • Robust Mechanism: Enhanced drive system to manage high contact pressure and prevent welding.
  • 2kV Insulation: Higher voltage margin than standard 1140V units for industrial grids.
Quality Control

Reliability for Critical Industrial Processes

Whether it’s the casting quality of our solid poles or the durability of our heavy-duty contactors, XBRELE ensures zero compromise through specialized manufacturing checks.

Specialized Production Process

Our manufacturing line is adapted to handle both the precision casting required for solid insulated poles and the heavy-duty assembly required for demanding industrial and mining contactor applications.

  • 01

    APG Resin Casting for Solid Poles

    For solid-insulated designs, we use Automatic Pressure Gelation (APG) epoxy casting to mould the pole. This ensures a void-free structure with high dielectric strength and tracking resistance.

  • 02

    AC-3 / AC-4 Duty Simulation

    Low-voltage contactors undergo rigorous AC-3 and AC-4 duty testing to simulate frequent inching, plugging and heavy starting conditions under high arc stress.

  • 03

    Vacuum Integrity Check

    Each vacuum interrupter is checked for contact resistance in the micro-ohm range and undergoes vacuum integrity testing before assembly to guarantee arc-extinguishing performance.

  • 04

    Mechanism Calibration

    We precisely adjust overtravel and contact pressure to keep bounce within limits and prevent contact welding in the event of short-circuit or overload conditions.

  • 05

    Final Dielectric Test

    Finished units are subjected to power-frequency withstand tests in line with product standards, ensuring safety margins between main circuit, control circuit and ground.

QA Standards

Verified Performance

Our testing protocols comply with IEC and GB standards for both low-voltage switchgear and solid-insulated components, ensuring reproducible performance from batch to batch.

Electrical Verification

  • Dielectric tests: Power-frequency withstand tests between phase-to-phase, phase-to-earth and across open contacts according to IEC/GB requirements.
  • Impulse tests: Lightning impulse withstand tests on representative samples to confirm insulation coordination of the design.
  • Making / breaking tests: AC-3 and AC-4 duty tests for contactors to validate breaking capacity and arc control under real operating conditions.

Mechanical & Endurance Tests

  • Mechanical life: Type tests up to hundreds of thousands of operations, depending on frame size and duty class.
  • Electrical endurance: Endurance tests at rated current and specified duty (AC-3 / AC-4) to confirm switching life under load.
  • Operating consistency: Verification of pick-up and drop-out voltages, contact synchronization and operating times for each production batch.

Process Control & Traceability

  • Incoming inspection: Key components such as vacuum interrupters, coils and insulating parts are sampled and tested before entering production.
  • In-line checks: Critical dimensions, torque and contact pressure are monitored using SPC methods during assembly.
  • Full traceability: Each unit can be traced back to its production order and test records via nameplate and internal batch coding.

Detailed test reports and type test certificates can be provided on request for project documentation and third-party verification.

Delivery & Project Support

Reliable Supply Chain for Mining & Industry

Whether you need urgent replacements for a mining site or batch delivery for a new plant, XBRELE ensures your low voltage and solid-insulated contactors arrive on time and ready to install.

Lead Time

Flexible Production

Our manufacturing lines are optimized for quick turnaround of standard industrial models.

  • Standard CKJ Models: 15–20 days lead time for typical orders.
  • LZNJ Solid Series: 20–25 days (requires resin curing & testing).
  • Urgent Mining Support: Expedited dispatch for breakdown situations.
  • Spare Parts: Vacuum bottles and coils often in stock for immediate shipment.
Packing & Logistics

Heavy-Duty Protection

Industrial shipping requires robust packaging. We ensure your equipment withstands long-distance transport.

  • Wooden Crating: Fumigated export crates for all heavy units (CKJ/LCZ3).
  • Moisture Barrier: Vacuum-sealed packaging to prevent corrosion at sea.
  • Shock Protection: Reinforced foam to protect the solid-embedded poles of LZNJ.
  • Labeling: Clear identification for easy site receiving and inventory.
Engineering Support

Integration Expertise

Our technical team helps you integrate these specialized contactors into your control panels.

  • Retrofit Advice: Guidance on replacing old air-break contactors with vacuum units.
  • Dimensional Drawings: CAD files for panel layout planning.
  • Circuit Design: Support for control circuit wiring (AC/DC options).
  • Maintenance Guides: Detailed manuals for long-term operation.
Get a Quote & Lead Time
FAQ · LV & Solid Series

Common Questions About Low Voltage Vacuum Contactors

Engineering insights on selecting the right low voltage vacuum contactor for mining (1.14kV) or solid-insulated models for harsh industrial environments.

Why use a Low Voltage Vacuum Contactor instead of an Air Break Contactor? +
A Low Voltage Vacuum Contactor (like the CKJ series) offers significant advantages over traditional air break contactors, especially in mining. The vacuum interrupter contains the arc completely, preventing external flashovers and explosion risks in 1.14kV underground environments. Additionally, they provide a much longer electrical life and require zero contact maintenance.
What are the benefits of Solid Insulated Vacuum Contactors (LZNJ)? +
Our Solid Insulated Vacuum Contactors (LZNJ Series) utilize epoxy resin embedded poles. This advanced design protects the vacuum tube from dust, humidity, and condensation, making it the ideal choice for cement plants, steel mills, and chemical industries where pollution can cause insulation failure in standard contactors.
Are CKJ series contactors suitable for AC-4 mining duty? +
Yes, the XBRELE CKJ series is a robust low voltage vacuum contactor specifically engineered for AC-4 duty cycles (frequent inching and plugging). It is widely used in mining conveyors and crushers where motors are started and stopped frequently under heavy load, offering reliable performance up to 100,000 AC-4 operations.
Do you offer Low Voltage Vacuum Contactors for high currents (3200A)? +
Absolutely. For heavy industrial drives, our LCZ3 series serves as a high-capacity low voltage vacuum contactor rated for 2kV networks. With a rated current of up to 3200A, it is the perfect solution for main circuit switching in large soft starter cabinets and variable frequency drive (VFD) bypass applications.
Can the LZNJ Solid Insulated Contactor be installed horizontally? +
Yes. The LZNJ Solid Insulated Vacuum Contactor features a flexible structural design that supports both vertical and horizontal installation. This adaptability allows panel builders to integrate the unit into various switchgear layouts, including withdrawable handcarts and compact fixed cabinets.
Is there a single-pole option for 1.14kV systems? +
Yes, XBRELE offers the CKJ1 and LCZ1 series as single-pole low voltage vacuum contactors. Rated at 1.14kV, these units are designed for specialized single-phase loads such as industrial heating furnaces, electric traction systems, and oilfield pump controls where independent phase switching is required.
What is the difference between CKJ5 and CKJ20 series? +
Both are rated for 1.14kV mining applications, but they serve different needs. The CKJ5 series handles higher currents (1000A, 1250A), while the CKJ20 series is a compact model (630A, 800A) designed for space-constrained flameproof enclosures.
What testing standards do these contactors meet? +
All XBRELE contactors undergo strict testing according to international standards. For detailed information on insulation coordination and testing protocols, you can refer to the IEC 60947 standards documentation .