JCZ1 Series AC High-Voltage Vacuum Contactors

The JCZ1 series AC high-voltage vacuum contactors (hereinafter referred to as "contactors") are designed for use in AC power networks operating at 50–60 Hz, with a main circuit rated operating voltage of 7.2 kV or 12 kV and a rated current of 630 A or less. They are used for remote switching, disconnection, and frequent starting and control of AC motors, and are particularly suitable for use in combination with fuses and various protective devices as a replacement for vacuum circuit breakers.

                      JCZ1 series AC high-voltage vacuum contactors has many applications:

1. Motor Control: Frequent starting, stopping, and reversing of high-voltage asynchronous/synchronous motors (e.g., in mining, metallurgy, chemical, and machinery industries)

2. Transformer Switching: Frequent switching of distribution transformers and rectifier transformers (AC-6a)

3. Capacitor Bank Switching: Frequent switching of reactive power compensation capacitor banks (AC-6b, optimized for JCZ1C type)

4. FC Circuit (Contactor-Fuse Combination): Used in medium-voltage switchgear for integrated protection and control

5. Grounding/Arc Suppression Devices: Frequent switching of generator neutral point grounding resistor cabinets and arc suppression coil circuits

6. Other Loads: Frequent operation applications such as electric furnaces, rectifier equipment, high-voltage frequency converters, and rail transit traction power supply

1. Long Electrical Life and Minimal Maintenance: Vacuum interrupter sealed structure prevents contact oxidation and erosion, resulting in an electrical life several times longer than oil-free/magnetic blow-out contactors; virtually maintenance-free, requiring no oil changes or contact gap adjustments.

2. Suitable for Frequent Operation: Capable of high operating frequencies (up to hundreds of times/hour), suitable for motors, capacitors, electric furnaces, and other applications requiring frequent start-stop and switching, and less prone to damage.

3. Reliable breaking capacity and short arcing time: The vacuum dielectric extinguishing mechanism provides rapid arc extinguishing, low overvoltage, and minimal impact on the power grid and load, making it suitable for switching inductive/capacitive loads such as capacitors and motors.

4. Small size and compact structure: Compared to traditional high-voltage contactors, it has a smaller overall size, facilitating installation in switchgear, FC cabinets, and motor control cabinets, saving space.

5. Long mechanical life: The simple and reliable mechanism boasts a mechanical life of up to millions of cycles, stable operation, and a low failure rate.

6. No fire or explosion risk, environmentally friendly and safe: It produces no oil, no gas, and no flammable media, preventing oil spraying, gas leakage, and explosions; it does not produce toxic gases, making it suitable for indoor, underground, and chemical environments with high safety requirements

1. This series of contactors consists of an insulated frame, metal base, transmission crank arm, electromagnetic system, auxiliary switch, and vacuum switch tube (see Figure 1). When the electromagnetic coil is energized with a control voltage, the armature drives the crank arm, closing the main contacts inside the vacuum switch tube. When the electromagnetic coil is de-energized, the main contacts open due to the action of the opening spring.

2. The vacuum switch tube consists of an upper cover, a lower cover, a metal bellows, and a ceramic tube. The outer shell of the vacuum switch tube is made of 95% ceramic insulating material in a corrugated ceramic tube, which features a large creepage distance, high mechanical strength, heat resistance, and impact resistance. A pair of moving and stationary contacts are encapsulated inside the vacuum switch tube. The contact material is a wear-resistant Cu-W-Wc with a low current-cutting value. This reduces overvoltage caused by current cutting during the breaking process while meeting breaking performance requirements, thus improving the service life of the vacuum switch tube. When the metal bellows moves axially, it drives the moving contact to perform the opening and closing action.

3. The electromagnetic system, considering the good matching of actual attraction and reaction characteristics, and leveraging the advantages of low noise and energy saving during contactor operation, adopts a DC dual-coil system consisting of starting and holding windings, switched via an auxiliary switch. For ease of AC power operation, the contactor is equipped with a bridge rectifier.

4. Mechanical locking: When the closing coil is energized, the contactor closes, and the mechanical lock engages; when the trip coil is energized, the mechanical lock disengages, and the contactor releases. When the trip coil is hot, its voltage remains within the range of 85%-110% of Us, ensuring reliable contactor release.

5. Main circuit number of poles: One, three, or multiple poles.

6. Control power supply voltage: AC 110V, 220V. Other voltages can be customized according to user needs.

7. DC electromagnetic system: AC control power is supplied to the coils through a bridge rectifier.

8. Auxiliary circuit contacts should be four normally open and three normally closed.

9. The rated heating current of the auxiliary switch contact circuit is 5A.

10. Rated duty cycle: Intermittent long-term duty cycle, repetitive short-time duty cycle (rated duty cycle 40%).

                                                                                                                                         JCZ1-D Series Single-Pole Dimensions and Mounting Dimestions          

                                                                                                             Figure 2 JCZ1-NS Permanent Magnet Series: Single-Pole Dimensions and Mounting Dimensions

                                                                                                                                         Figure 3 JCZ1-D Series Single-Pole External Wiring Diagram   

                                                                                                                           Figure 4 JCZ1-NST Permanent Magnet Series Single-Pole External Wiring Diagram      

Specialized manufacture: specialized manufacture 12kV~40.5kV indoor and outdoor high voltage vacuum circuit breaker and Switchgear and SF6 Gas insulated switchgear.

Team: Having a professional management team with more than 20 years working Experience

Product: Having 6 patents, main products are intelligent and miniaturization switch such as VTZ,VS1,ZN85 etc. That provide reliable and safe service in transmission and distribution industry and do the indispensable power equipment manufacturing industry participants.

Technical and cooperation: Having a professional technical team, collaboration with several universities and institutions on industry, education and research.

Honour: 1. High and new technology enterprise

2. Memeber of China Electrical Equipment Industrical ASSOCIATION

3. ISO9001 quality management system certification

4. Type test report from China autorized Lab

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