ZW20F-12 Series 12kV Outdoor Vacuum Circuit Breaker

Our ZW20F-12 outdoor vacuum circuit breakers feature a proven sealed tank structure filled with SF6 gas, delivering maintenance-free operation and reliable performance in 12kV distribution automation systems.

• Rated at 12kV with current options of 630A and 1250A; short-circuit breaking up to 31.5kA with making current up to 50kA.

• SF6 sealed tank ensures excellent sealing, impervious to external environments, and essentially maintenance-free.

• Spring operating mechanism with automatic chain main drive and multistage tripping system ensures high operational reliability with 10,000 mechanical operations.

• Rated short-circuit breaking operations ≥30 times with opening/closing asynchronism ≤2ms for precise control.

• When paired with controller, meets distribution automation requirements and reliably performs traditional recloser functions.

• Fast delivery, reliable quality, responsive service, and extensive project experience backed by our company.

Product Overview

The ZW20F12 outdoor AC high voltage sectionalizing vacuum circuit breaker is a type of outdoor highvoltage switchgear with a rated voltage of 12 kV and a threephase AC frequency of 50 Hz. It is primarily designed for making and breaking load currents, overload currents, and shortcircuit currents in power systems. Suitable for protection and control applications in substations, industrial and mining enterprises, and urban/rural distribution networks, it is particularly wellsuited for locations requiring frequent operation and for lines in automated urban distribution networks. When used in conjunction with a controller, this product meets the requirements of distribution automation systems and can reliably and effectively perform traditional recloser functions. It employs a proven sealed tank structure, internally filled with SF6 gas, which provides excellent sealing performance, making it impervious to external environmental influences and essentially maintenancefree. Its spring operating mechanism utilizes an automatic chain main drive and a multistage tripping system, ensuring high operational reliability and making it an excellent choice for polemounted circuit breakers.

Technical Specifications

S.Q.	Item	Parameter
Rated Voltage	kV	12
Rated Frequency	Hz	50
Rated Current	A	630/1250
Rated Short-Circuit Breaking Current	kA	20/25/31.5
Rated Making Current (Peak)	kA	50
Rated Dynamic Withstand Current (Peak)	kA	50
4s Short-Time Withstand Current	kA	20
Rated Operating Sequence		O-0.3s-CO-180s-CO
Rated Charging Motor Voltage	V	AC220
Maximum/Minimum Charging Motor Voltage	V	AC242/187
Rated Closing Operating Voltage	V	AC220
Maximum/Minimum Closing Operating Voltage	V	AC264/143
Rated Opening Operating Voltage	V	AC220
Maximum/Minimum Opening Operating Voltage	V	AC264/143
Closing Asynchronism	ms	≤2
Opening Asynchronism	ms	≤2
SF6 Gas Rated Pressure (Gauge)	Mpa	0.01
Rated Number of Short-Circuit Breaking Operations	times	≥30
Mechanical Life	times	10000

Model and Designation

Z W 20 12 / T □ □

Z: Vacuum

W: Outdoor

20: Design Serial Number

12: Rated Voltage (kV)

T: Spring Operating Mechanism

□: Rated Current (A)

□: Rated ShortCircuit Breaking Current (kA)

Normal Service Conditions

1. Ambient Air Temperature: 30℃ to +40℃.

2. Altitude: Not exceeding 2000 m above sea level.

3. Ambient Air: May be subjected to pollution by dust, smoke, corrosive gases, vapor, or salt mist.

4. Wind Speed: Not exceeding 34 m/s (corresponding to 700 Pa pressure on a cylindrical surface).

5. Vibration: No frequent severe vibration.

6. Pollution Degree: Class III.

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