ZN12-12 vacuum circuit breaker is an indoor switchgear for rated voltage 12kV, AC 50/60Hz. The operating mechanism of this product is manufactured with 3AF type mechanism introduced from Siemens of Germany. After years of improvement and verification in China, it has stable performance and advantages. It is suitable for control and protection switches of power transmission and distribution systems such as power plants and substations, especially for breaking important loads and frequent operations. It is usually used as a fixed unit and equipped with corresponding mechanical interlocking, and is used in fixed cabinets such as XGN.

Product Specifications

Specification Sheet

No.	Name	Unit	Data
1	Rated Voltage	kV	12
2	Rated Frequency	Hz	50/60
3	Rated Current	A	630/1250/1600/2000/2500/3150/4000/5000
4	Rated Power Frequency Withstand Voltage	kV	48(Common Value) /42(Across the Isolating Distance)
5	Rated Lighting Impulse Withstand Voltage	kV	75(Common Value) /85(Across the Isolating Distance)
6	Rated Short-Circuit Breaking Current	kA	25/31.5/40/50
7	Rated Short-Circuit Making Current (Peak)	kA	63/80/100/125
8	Rated Withstand Current (Peak)	kA	63/80/100/125
9	Rated Duration of Short-Circuit	s	4
10	Operating Cycles at Rated Short-Circuit Breaking Current	Times	E2
11	Mechanical Endurance	Times	30000
12	Standard Operating Sequence	-	O-0.3s-CO-180s-CO
13	Allowable Wear Thickness of Contact	mm	≤3

Mechanical Characteristics

No.	Name	Unit	Data
1	Clearance between Moved and Fixed Contact	mm	9±1
2	Contact Overtravel	mm	3.5±0.5
3	Average Closing Speed	m/s	0.7±0.2
4	Average Opening Speed (Average Speed of First Opening at 6mm)	m/s	1.1±0.2
5	Rated Contact Pressure	N	2500±200N(25kA) 3100±200N(31.5kA) 4800±300N(40kA) 6000±500N(50kA)
6	Closing Time	ms	30～70
7	Opening Time	ms	20～50
8	Contact Bouncing Duration at Closing Operation	ms	≤2
9	No-Simultaneity of Closing/Opening Operations of 3-Phase	ms	≤2

Product Advantages

ZN12-12 vacuum circuit breaker has many advantages:

Performance of circuit breaker：

E2-C2-M2

Simple and convenient maintenance:

It is modified from Siemens 3AF mechanism. It does not need to remove other components to replace the closing and opening coils. Users can easily replace them, and no test and adjustment are required after replacement, making later operation and maintenance more convenient.

High conductivity:

The exposed arc extinguishing chamber and conductive bracket can maximize the current carrying capacity.

Wide application range:

the product series has a wide application range, rated currents from 630A to 5000A, and rated breaking currents from 20kA to 50kA. It is suitable for all environments within an altitude of 4500 meters and an operating temperatures from -40°C to 40°C.

Product Applications

ZN12-12 vacuum circuit breaker has many applications:

Principle diagram of automatic reclosing

Power plants

Industrial fields (chemical industry, steel, petroleum, coal, etc.)

Power transmission and distribution system

Important occasions and frequent operation places

Product Outline Drawing

ZN12-12 indoor high-voltage vacuum circuit breaker price

buy ZN12-12 indoor high-voltage vacuum circuit breaker

1. Mechanism compartment 2. Insulating bottle 3. Fixed interrupter support 4. Vacuum interrupter 5. Insulating pole 6. Clamp 7. Flexible connector 8. Bolts 9 Securing board 10. Movable interrupter support 11. Angled lever 12. Adjusting bolts 13. Insulating pole 14. Contact pressure spring 15. Angled lever 16. Oil buffer

Note: Dimensions in bracket are the ones for the product over 40kA

Type	L	L0	L1	L2	L3	Note
ZN12-12	210	215	586	610	514	with barriers between phases
ZN12-12S	230	240	620	650	565	with barriers between phases
ZN12-12W	250	240	700	740	565
ZN12-12Q	275	215	726	750	514

Secondary Wiring Diagram

TQ	Tripping electromagnet
HQ	Closing electromagnet
M	Energy storage motor
KO	Intermediate relay
XT	Wire connecting terminal
S2	Auxiliary switch
SP1,SP2,SP3,SP4,SP7	Energy storage signal contact

After-sales and Service

We are committed to providing exceptional after-sales support to our global customers. Our services include worldwide technical support and warranty coverage, such as online remote technical support, video training, and on-site installation guidance. During the warranty period, we respond quickly to equipment defaults, and provide repair or replacement services, with the option to extend warranties as needed. To ensure effective communication, we also offer multilingual support and provide a comprehensive feedback mechanism that allows us to track customer satisfaction and continuously improve our service quality.

Hot Tags: zn12-12 vacuum circuit breaker, China zn12-12 vacuum circuit breaker manufacturers, suppliers, factory, VTZ 17 5 Vacuum Circuit Breaker, ZN85 40 5K Vacuum Circuit Breaker, ZN85 40 5 Miniaturized Vacuum Circuit Breaker, VS1 12 Vacuum Circuit Breaker with Lateral Operating Mechanism, VS1 12 Vacuum Circuit Breaker, VTZ 12 K59 Vacuum Circuit Breaker

Products

ZN12-12 Vacuum Circuit Breaker

Product Specifications

Product Advantages

Product Applications

Product Outline Drawing

After-sales and Service