EATON Series 8/9 (VISA8/VISA9) vacuum arc extinguishing chamber

EATON Series 8/9 (VISA8/VISA9) vacuum arc extinguishing chamber

Core positioning and technological advantages of the product

Core positioning: As the core arc extinguishing component of high-voltage switchgear, it is designed specifically for circuit on/off, overload protection, and short-circuit fault cut-off. It is suitable for medium low voltage to medium high voltage (12kV~72.5kV) distribution systems and is an environmentally friendly solution to replace SF6 gas arc extinguishing;

Technical principle: Utilizing a vacuum environment (pressure<10 ⁻⁴ Pa) to achieve rapid arc extinguishing, low arc energy, short arc extinguishing time, no greenhouse gas or toxic gas emissions, in line with global environmental trends;

Core strengths

Environmental safety: No harmful gases such as SF6, low noise, no arcing, and no oxidation or corrosion of contacts (isolated from the atmosphere in a vacuum environment);

High reliability: Hard contact materials reduce the risk of adhesion, solid insulation improves external dielectric performance, and contact resistance is less than 8 μ Ω~25 μ Ω (depending on the model);

Flexible adaptation: Modular design, uniform product size for different currents/breaking capabilities at the same voltage level, supporting "plug and play" upgrades;

Stable supply: Dual manufacturing bases in North America and China to avoid supply risks from a single origin.

Product series and core parameters

（1） Series classification and voltage adaptation

Product series voltage level adaptation standard core application

VISA8 12/15/17.5/24kV GB/IEC/IEEE/DL medium and low voltage circuit breakers RMU、 load switch

VISA9 36/38/40.5/72.5kV GB/IEC/IEEE/DL medium and high voltage circuit breakers, railway circuit breakers, reclosers

Customized standard contactors, tap changers, and new energy power stations for special series 12/24/27.5/38kV scenarios

（2） Key electrical parameters (typical values)

Explanation of Parameter Category Value Range

Rated voltage (Ur) 12kV~72.5kV covers the full range of medium and low voltage to medium and high voltage

Rated current (Ir) 400A~3150A, minimum 400A for contactor models and maximum 3150A for circuit breaker models

Rated short-circuit breaking current (Isc) 4kA~50kA, minimum 4kA for contactor models and maximum 50kA for high-voltage circuit breaker models

Rated short-time withstand current (Ik) 4kA~50kA, withstand time 3s~4s (according to standards)

Rated peak withstand current (Ip) 15kA~128kA corresponds to the peak short-circuit current, ensuring the equipment's ability to withstand impact

Contact resistance (Rc)<8 μ Ω~25 μ Ω Silver plated electrode (S-type) has lower resistance and better conductivity

（3） Mechanical and lifespan parameters

Parameter category value range represents model example

Contact stroke 5.5mm~19mm Contact model 5.5mm, High voltage model 19mm

Opening speed 0.6m/s~2.0m/s Contactor type 0.6m/s, Recloser type 2.0m/s

Closing speed 0.3m/s~1.6m/s Contactor type 0.3m/s, High voltage type 1.6m/s

Mechanical lifespan: 10000 to 1 million cycles. Railway payment: 10000 cycles, contactor payment: 1 million cycles

Electric lifespan of 25000 to 250000 cycles for load switches and 250000 cycles for circuit breakers

Storage life of 20 years in original packaging, stored in a dry and clean environment

Detailed classification of product series

（1） Main series core models

VISA8 series (medium and low voltage)

12/15/17.5kV model: rated current 630A~3150A, short-circuit breaking current 20kA~50kA, representative model WL-41143（1250A/25kA）、WL-41177（3150A/50kA）；

24kV model: rated current 1250A~3150A, short-circuit breaking current 25kA~40kA, representative model WL-41243（1250A/25kA）、WL-41267（3150A/40kA）；

VISA9 series (medium high voltage)

36/38kV model: rated current 630A~2500A, short-circuit breaking current 16kA~31.5kA, representative model WL-41333A（1250A/20kA）、WL-41356A（2500A/31.5kA）；

40.5kV model: rated current 1250A~3150A, short-circuit breaking current 20kA~40kA, representative model WL-41433（1250A/20kA）、WL-41467（3150A/40kA）；

72.5kV model: High voltage flagship model, suitable for core equipment such as substations, with a short-circuit breaking current of up to 50kA.

（2） Scene specific series

table

Specialized type, voltage level, core parameters, characteristics, representative models

RMU dedicated 12/17.5/24kV compact size, rated current 630A~1250A WL-41907, WL-36193A

LBS dedicated 12/24/36kV has a fast opening speed (1.0m/s~1.6m/s) and supports load current cut-off for WL-41090 and WL-41093

Special 12kV contactor with long mechanical life (1 million cycles) and rated current of 400A WL-41909

The dedicated 15.5/27/38kV recloser supports E2 level reclosing, with an electrical lifespan of 250000 cycles WL-39352 and WL-42322A

Railway specific 27.5kV anti vibration impact, rated current 2500A WL-41949WE

Key design and structural characteristics

Contact design: Provides 4 types of contacts to adapt to different current levels and breaking requirements

Flat docking type: suitable for low and medium current scenarios, with a simple and reliable structure;

Transverse magnetic field (TMF): disperses arcs, reduces contact erosion, and is suitable for medium currents;

Axial magnetic field (AMF): coil/horseshoe shaped, uniform arc diffusion, suitable for high currents (>2000A);

Insulation configuration: Supports multi scenario insulation requirements, with optional air insulation, EPU/SF6 insulation, silicone rubber coating (E-type), silver plated electrodes (S-type), dielectric withstand voltage up to 75kV~215kV (peak);

Mechanical structure: Pre compression design (no additional mechanical compression required), anti twist lining ensures concentricity, contact stroke accuracy ± 0.5mm, rebound amount ≤ 2mm, ensuring arc extinguishing reliability.

Production and Quality Assurance

Manufacturing and Supply: Adopting a dual manufacturing base layout of North America and China to achieve regional supply, shorten delivery cycles, and reduce supply chain risks;

quality control

Full process testing: Each product must undergo dielectric withstand voltage testing, vacuum sealing testing, and 100% inspection of key parameters before leaving the factory;

Traceability system: using serial numbers for full traceability, it can track raw material batches, production operators, and test data;

Reliability verification: Over 3 million units worldwide are operating on the grid, with operational cases covering multiple fields such as power, industry, and transportation, and an average time between failures (MTBF) of over 100000 hours;

Standard compliance: Compliant with domestic and international standards such as GB 1984, IEC 62271-100, IEEE C37.60, DL/T 402, and certified by UL, CE, CB, etc.

Application Fields and Adaptation Scenarios

Power system: medium and low voltage distribution network, substation circuit breakers/load switches, distribution network reclosers, ensuring stable operation of the power grid;

Industrial scenarios: High voltage distribution for industrial enterprises, UPS power supply for data centers, and combiner boxes for new energy power stations (photovoltaic/wind power);

Transportation field: Railway locomotive traction power supply system, urban rail transit power distribution equipment;

Municipal and Infrastructure: Distribution of municipal infrastructure, power supply guarantee for commercial complexes, power protection for key places such as hospitals/airports.