JCZ5 & JCZ1 Series Vacuum Contactors
XBRELE JCZ Series offers reliable medium voltage switching solutions for power systems. Featuring the JCZ5 3-phase vacuum contactor (7.2kV / 12kV) for F-C cabinets and motor control, and the specialized JCZ1 single-pole vacuum contactor (12kV) for electric locomotives and single-phase loads. Designed with a robust frame structure for frequent operation and long mechanical life.
Engineered for F-C Switchgear & Specialized Industrial Loads
The XBRELE JCZ vacuum contactor series offers a comprehensive range of medium voltage switching solutions, split into two distinct categories: the JCZ5 (Three-phase) and the JCZ1 (Single-pole). Both series feature a robust frame structure that integrates the vacuum interrupter and operating mechanism into a single, easy-to-maintain unit.
The JCZ5 series (7.2kV / 12kV) is the standard choice for indoor power distribution. It is widely used in F-C (Fuse-Contactor) cabinets for controlling high-voltage motors and transformers. With rated currents up to 630A and optional mechanical latching, it provides reliable control for frequent operation scenarios like pump stations and capacitive load loops.
The JCZ1 series (12kV) is a specialized single-pole (monopole) vacuum contactor. It is specifically engineered for single-phase power systems, such as electric locomotives and polysilicon reduction furnaces. Its compact design allows for flexible installation in restricted spaces while maintaining high insulation levels and arc-extinguishing capability.
For a broader view of XBRELE’s medium-voltage switching portfolio, please visit the Vacuum Contactor pillar page .
JCZ5 & JCZ1 Series High Voltage Vacuum Contactors
Browse the technical specifications and installation drawings for our JCZ5 (Three-phase) and JCZ1 (Single-pole) series. These frame-structure contactors are designed for reliable high-voltage switching in industrial and power distribution applications.
JCZ5 Three-Phase Indoor Vacuum Contactors
The JCZ5 series adopts a “whole structured” frame design, integrating the vacuum interrupter and operating mechanism into a robust unit. Applicable to AC 50Hz power systems with rated working voltages of 7.2kV and 12kV, and rated currents up to 630A.
These contactors are capable of frequent operation and possess strong making/breaking abilities. They are extensively used in F-C (Fuse-Contactor) cabinets, reactive power compensation devices, and for controlling motors and transformers.
The table below compares the technical parameters for both the 7.2kV and 12kV models. Please refer to the dimensions section for installation details.
Main technical parameters — JCZ5 Series
Comparison of JCZ5-□/7.2 and JCZ5-□/12 models.
| No. | Item | Unit | JCZ5-□/7.2 | JCZ5-□/12 |
|---|---|---|---|---|
| 1 | Rated voltage | kV | 7.2 | 12 |
| 2 | Rated current | A | 160, 250, 400, 630 | 160, 250, 400, 630 |
| 3 | Power frequency withstand voltage (1 min) | kV | 32 | 42 |
| 4 | Lightning impulse withstand voltage | kV | 60 | 75 |
| 5 | Rated breaking capacity (AC-3) | A | 8Ie (25 times) | 8Ie (25 times) |
| 6 | Rated closing capacity (AC-3) | A | 10Ie (100 times) | 10Ie (100 times) |
| 7 | Rated short-time resistance current | kA | 10Ie (1.6~6.3) | 10Ie (1.6~6.3) |
| 8 | Rated current peak tolerance | kA | 25Ie (4~16) | 25Ie (4~16) |
| 9 | Overload withstand current | kA | 15Ie (2.4~9.45) | 15Ie (2.4~9.45) |
| 10 | Short circuit breaking and closing | A | 10Ie (O-180s-CO 1 time) | 10Ie (O-180s-CO 1 time) |
| 11 | Rated contact gap | mm | 4 ± 0.5 | 6 ± 0.5 |
| 12 | Overtravel | mm | ≥ 1.5 | ≥ 1.5 |
| 13 | Closing synchronism | ms | ≤ 2 | ≤ 2 |
| 14 | Mechanical life | 10⁴ times | 50 | 50 |
| 15 | Electrical life (AC3 / AC4) | 10⁴ times | 25 / 10 | 25 / 10 |
Outline & mounting dimensions — JCZ5 Series
Outline dimensions differ slightly between voltage classes. Ensure you are viewing the correct drawing for your specific voltage requirement.
JCZ1 Single-Pole (Monopole) Vacuum Contactors
The JCZ1-□/12 series is a specialized monopole high-voltage vacuum contactor designed for single-phase power systems (AC 50Hz) with rated voltages up to 12kV.
It is particularly suitable for remote opening/closing of single-phase loads such as refining polysilicon reduction furnaces, electric locomotives, and harmonic elimination circuits. It features arc elimination capabilities, reduced capacity, and is often used as a host switch in specialized industrial applications.
See the table below for specific electrical ratings for the JCZ1 series.
Main technical parameters — JCZ1 Series
Ratings for JCZ1-□/12 Single-pole vacuum contactor.
| No. | Item | Unit | JCZ1-□/12 |
|---|---|---|---|
| 1 | Rated voltage | kV | 12 |
| 2 | Rated current | A | 160, 250, 400, 630 |
| 3 | Power frequency withstand voltage | kV | 42 |
| 4 | Lightning impulse withstand voltage | kV | 75 |
| 5 | Rated breaking capacity | A | 8Ie (25 times) |
| 6 | Rated closing capacity | A | 10Ie (100 times) |
| 7 | Rated short-time resistance current | kA | 10Ie (1.6~6.3) |
| 8 | Rated current peak tolerance | kA | 25Ie (4~16) |
| 9 | Overload withstand current | kA | 15Ie (2.4~9.45) |
| 10 | Short circuit breaking and closing | A | 10Ie (O-180s-CO 1 time) |
| 11 | Rated contact gap | mm | 5.5 ± 0.5 |
| 12 | Overtravel | mm | ≥ 1.5 |
| 13 | Mechanical life | 10⁴ times | 50 |
| 14 | Electrical life (AC3 / AC4) | 10⁴ times | 25 / 10 |
Outline & mounting dimensions — JCZ1-□/12
Use the drawing below for layout planning of single-phase control cabinets.
Advanced Configuration for Demanding MV Applications
The JCZ series is designed with flexibility in mind. From mechanical latching options to specialized single-pole configurations, XBRELE provides tailored solutions that integrate seamlessly into modern switchgear and control systems.
Flexible Operation Modes
JCZ contactors offer versatile holding mechanisms to suit different control circuit requirements and energy efficiency goals.
- Electricity-hold (Type D): Standard electrically maintained closing coil.
- Mechanical Latch (Type S): Mechanically retained for energy saving and security against voltage dips.
- Permanent Magnet (Type C): Available on select models for high endurance and low power consumption.
Optimized for F-C Cabinets
The frame structure and compact footprint make JCZ5 ideal for Fuse-Contactor (F-C) combinations in motor control centers.
- Compact Frame: Whole-structure design fits easily into standard MV switchgear panels.
- High Switching Capacity: Rated breaking capacity up to 8xIe and making capacity up to 10xIe.
- Wide Voltage Range: Contactless wide voltage options available for stable operation.
Zero Bounce & Single-Pole
Addressing specialized industrial needs with unique pole configurations and contact technologies.
- Single-Pole (JCZ1): Dedicated design for single-phase loads like furnaces and traction systems.
- Zero Bounce: Advanced contact technology to minimize arc erosion and extend electrical life.
- Remote Operation: Suitable for remote opening and closing of load loops in automated facilities.
Precision Engineering for Reliable MV Switching
The reliability of the JCZ series stems from a rigorous manufacturing process. From the vacuum interrupter integration to the final mechanical tuning, every step is controlled to ensure stable operation in critical F-C circuits.
End-to-End Manufacturing Process
XBRELE oversees the entire assembly of the JCZ vacuum contactor, ensuring that the electromagnetic system perfectly matches the vacuum interrupter’s characteristics.
- 01
Frame & Interrupter Assembly
Vacuum interrupters are precision-mounted into the insulating frame. We strictly control alignment to prevent mechanical stress and ensure optimal dielectric strength.
- 02
Electromagnetic System Integration
The closing/opening coils (AC/DC) and magnetic latches are installed. We verify the pick-up and drop-out voltages to guarantee reliable operation under fluctuating grid conditions.
- 03
Mechanical Parameter Tuning
Critical parameters such as contact gap (4±0.5mm / 5.5±0.5mm) and overtravel (≥1.5mm) are fine-tuned to maximize electrical life and minimize bounce.
- 04
Synchronism Adjustment
For 3-phase JCZ5 models, pole closing synchronism is adjusted to ≤2ms, ensuring balanced switching and reducing stress on connected motors or capacitors.
- 05
Final Inspection & Packing
Each unit undergoes power-frequency withstand voltage tests and multiple mechanical operation cycles before being sealed for shipment.
Rigorous Testing for Every Unit
We adhere to strict IEC and national standards, ensuring every JCZ contactor meets the demands of heavy-duty industrial applications.
Routine Electrical Tests
- Power-frequency withstand voltage (42kV / 1min)
- Main circuit resistance measurement (≤80µΩ)
- Control circuit functional verification
- Insulation resistance check
Test reports are archived for full traceability.
Mechanical Verification
- 500,000 operations mechanical life verification
- Zero-bounce performance check (for specific models)
- Visual inspection of frame structure and terminals
- Confirmation of latching mechanism reliability
Documentation & Support
- Comprehensive operation & maintenance manuals
- Dimensional drawings for switchgear integration
- Spare parts availability (coils, auxiliary contacts)
- Technical support for F-C coordination
Custom FAT (Factory Acceptance Test) plans available for large projects.
Streamlined Logistics & Engineering Services for JCZ Series
Whether you need a single replacement for maintenance or batch supply for a new switchgear line, XBRELE ensures your JCZ5 and JCZ1 vacuum contactors arrive safely and on schedule.
Production Schedule
We maintain a flexible manufacturing line to support both urgent maintenance needs and planned project rollouts.
- Standard Models (JCZ5/JCZ1): Typically 15–20 days after order confirmation.
- Custom Configurations: 25–35 days for special voltages or mechanical latching options.
- Urgent Dispatch: Expedited production available for breakdown replacements.
- Sample Orders: Prioritized for prototype testing and panel certification.
Specialized Protection
Vacuum interrupters are sensitive components. Our packaging is designed to withstand the rigors of international freight.
- Shock-Proofing: Reinforced foam padding to protect the ceramic vacuum bottles.
- Moisture Barrier: Vacuum-sealed interior bagging to prevent terminal oxidation.
- Export Crating: Robust plywood cases suitable for LCL/FCL sea freight.
- Documentation: Full set of packing lists and commercial invoices for smooth customs clearance.
Technical Resources
Our engineering team assists you throughout the design and integration phase of your MV panel.
- 2D/3D Drawings: CAD files available for precise panel layout planning.
- Coordination Curves: Support for F-C (Fuse-Contactor) coordination studies.
- Wiring Diagrams: Clear schematics for control circuit integration (AC/DC).
- Compliance: Assistance with type test report interpretation and standards verification.
Common Questions About JCZ5 & JCZ1 Vacuum Contactors
Technical insights for engineers selecting JCZ vacuum contactors for medium voltage switchgear, F-C cabinets, and single-phase industrial applications.