Name: China Customized ZN28 Indoor Vacuum Circuit Breaker Manufacturers Suppliers Factory - Jasco Electric
Brand: Jasco
SKU: 319629688

Product Description

The ZN28(A)-12 series high-voltage vacuum circuit breakers are designed for indoor power distribution systems with a rated voltage of 12 kV and a frequency of 50 Hz. This series comprises two models: the ZN28-12 (compact design) and the ZN28A-12 (split/suspended design). These circuit breakers can be installed in fixed-type high-voltage switchgear - such as the GG-1A(Z) or XGN2 models - or used to replace obsolete oil circuit breakers. Capable of controlling and protecting equipment such as transformers, motors, and capacitor banks, they are particularly well-suited for applications requiring frequent operation and are widely used in power plants, substations, industrial and mining enterprises, and building power distribution systems.

The ZN28(A)-12 series utilizes vacuum arc-extinguishing technology, offering advantages such as being oil-free, eliminating explosion risks, and providing high breaking capacity and long electrical service life. The ZN28 model features a compact design that integrates the switch body with the operating mechanism, whereas the ZN28A model employs a split design with the switch body and operating mechanism separated, allowing for flexible arrangement within the switchgear. The circuit breaker can be configured with either a CD17 electromagnetic operating mechanism or a CT17/CT19 spring operating mechanism to meet various interlocking requirements. High-strength ceramic insulators are used for insulation and structural support, ensuring stability, reliability, and effective air insulation performance; the mechanical structure is simple, facilitating on-site storage. All ZN28(A)-12 series products undergo factory testing in strict accordance with International Electrotechnical Commission (IEC) standards. Jasco Electric offers a wide range of specifications and electrical solutions tailored to customer needs, providing comprehensive tender documentation, factory test reports, and manufacturing certificates to satisfy the requirements of domestic and international power transmission and distribution projects.

Product Specification

Parameter	Unit	Value
Rated Voltage	kV	12
Rated Current	A	630, 1000, 1250; 1250, 1600; 1250, 1600, 2000, 2500; 1600, 2500, 3150
Rated Short-circuit Breaking Current	kA	20; 25; 31.5; 40
Rated Short-circuit Making Current	kA	50; 63; 80; 100
Rated Dynamic Withstand Current (peak)	kA	50; 63; 80; 100
Rated Short-time Withstand Current (r.m.s)	kA	20; 25; 31.5; 40
Rated Short-time Withstand Duration	s	4
Rated Short-circuit Breaking Time	-	30 (50) ms
Full Opening Time of CD10 Electromagnetic Actuator	ms	＜80
Rated Operating Sequence	-	0.3s
1min Power Frequency Withstand Voltage (r.m.s)	kV	42; 48
Lightning Impulse Withstand Voltage	kV	75; 85
Mechanical Endurance	times	10000

Operating Environment Conditions

Ambient temperature: -10℃ ~ +40℃
Altitude: ≤1000 m above sea level
Relative humidity: not more than 90% at +20℃
No obvious vibration and impact at installation site.
No flammable, explosive gas, corrosive gas or conductive dust in the surrounding air.
Indoor installation, no water leakage or condensation inside the switch room.

FAQ

1. Q: What equipment is this switch designed to protect?

A: It is designed for the switching and protection of power transformers, high-voltage motors, capacitor banks, and transmission lines in 12kV indoor power distribution systems; it can rapidly interrupt the circuit during overload and short-circuit faults.

2. Q: Is this equipment suitable for frequent operation?

A: Yes. It has a mechanical lifespan of 10,000 operating cycles, and the vacuum interrupter offers exceptional electrical endurance, making it ideal for industrial systems requiring frequent switching operations.

3. Q: What are the rated current specifications?

A: The rated current ranges from 630A to 3150A; standard short-circuit breaking current ratings include 20kA, 25kA, 31.5kA, and 40kA, meeting various grid requirements.

4. Q: What routine maintenance does the ZN28(A)-12 require?

A: The vacuum interrupter unit features a sealed design and is maintenance-free. Routine inspections involve tightening main circuit contacts, cleaning insulation surfaces, and lubricating the operating mechanism; there is no need to replace insulating oil.

5. Q: Which standards does this product meet?

A: The product is designed and manufactured in accordance with IEC standards, and every finished unit undergoes rigorous factory testing before shipment.

6. Q: What are the advantages of the vacuum design compared to oil-filled switches?

A: The oil-free structure eliminates the risk of fire and explosion while preventing oil leakage and environmental pollution hazards; key features include low arc energy, stable insulation performance, and low long-term maintenance costs.

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