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.
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 .
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.
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.
Technical Parameters: CKJ Series (1.14kV)
| No. | Item | Unit | CKJ5-1.14 | CKJ20-1.14 | CKJ1-1.14 |
|---|---|---|---|---|---|
| 1 | Rated Voltage | kV | 1.14 | 1.14 | 1.14 |
| 2 | Rated Current | A | 1000, 1250 | 630, 800 | 160 |
| 3 | Vacuum Fracture Withstand | V | 7000 | 6000 | 6000 |
| 4 | Power Freq. Withstand | V | 4200 | 4200 | 4200 |
| 5 | Rated Breaking Capacity | – | 5kA | 8Ie (25 times) | 8Ie (25 times) |
| 6 | Rated Making Capacity | – | 6.3kA | 10Ie (100 times) | 10Ie (100 times) |
| 7 | Short-time Withstand | kA | 6.3 | 6.3 (10Ie) | 1.6 (10Ie) |
| 8 | Peak Withstand | kA | 16 | 16 (25Ie) | 4 (25Ie) |
| 9 | Overload Withstand | kA | 9.45 | 9.45 | 2.4 (15Ie) |
| 10 | Short Circuit Break/Close | – | – | 10Ie (1 time) | 10Ie (1 time) |
| 11 | Rated Contact Gap | mm | 3±0.5 | 2.5±0.5 | 2±0.5 |
| 12 | Overtravel | mm | ≥1.5 | ≥1.5 | ≥1 |
| 13 | Closing Synchronism | ms | 2 | 2 | – |
| 14 | Mechanical Life | 10⁴ | 50 | 50 | 50 |
| 15 | Electrical Life (AC3 / AC4) | 10⁴ | 25 / 10 | 25 / 10 | 25 / 10 |
Outline Dimensions
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.
Technical Parameters: LCZ Series (High Current)
| No. | Item | Unit | LCZ3-3200 | LCZ3-2000 | LCZ1-1.14 |
|---|---|---|---|---|---|
| 1 | Rated Voltage | kV | 2 | 2 | 1.14 |
| 2 | Rated Current | A | 3200 | 1600, 2000 | 1600, 2000 |
| 3 | Vacuum Fracture Withstand | V | 10000 | 10000 | 7000 |
| 4 | Power Freq. Withstand | V | 4200 | 4200 | 4200 |
| 5 | Rated Breaking Capacity | – | 2.5Ie (AC2) | 4Ie (AC2) | 4Ie (AC2) |
| 6 | Rated Making Capacity | – | 4Ie (AC2) | 4Ie (AC2) | 4Ie (AC2) |
| 7 | Overload Withstand | kA | 10 | 10 | 10 |
| 8 | Rated Contact Gap | mm | 3.5±0.5 | 3.5±0.5 | 3.5±0.5 |
| 9 | Overtravel | mm | 2 | 2 | 2 |
| 10 | Closing Bounce | ms | 2 | 2 | 2 |
| 11 | Closing Time | ms | – | – | 60 |
| 12 | Opening Time | ms | – | – | 40 |
| 13 | Mechanical Life | 10⁴ | 50 | 50 | 50 |
| 14 | Electrical Life (AC2) | 10⁴ | 25 | 25 | 25 |
Outline Dimensions (LCZ LV Series)
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.
Technical Parameters: LZNJ Series
| No. | Item | Unit | LZNJ-12/630 |
|---|---|---|---|
| 1 | Rated Voltage | kV | 12 |
| 2 | Rated Current | A | 630 |
| 3 | Power Freq. Withstand | kV | 42 |
| 4 | Lightning Impulse | kV | 75 |
| 5 | Rated Breaking Capacity | A | 8Ie (25 times) |
| 6 | Rated Closing Capacity | A | 10Ie (100 times) |
| 7 | Short-time Withstand | kA | 6.3 (10Ie) |
| 8 | Peak Withstand | kA | 16 (25Ie) |
| 9 | Peak Current Time | s | 2 |
| 10 | Rated Contact Gap | mm | 5.5±0.5 |
| 11 | Overtravel | mm | 1.5 |
| 12 | Main Circuit Resistance | μΩ | ≤80 |
| 13 | Closing/Opening Time | ms | ≤60 / ≤40 |
| 14 | Mechanical Life | 10⁴ | 30 (300,000) |
| 15 | Electrical Life (AC3 / AC4) | 10⁴ | 25 / 10 |
Outline Dimensions
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.
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.
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 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.
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.
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.
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.
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.
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.
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.
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.