The CKWB-12 Primary And Secondary Integrated Pole-Mounted Circuit Breaker features vacuum arc-quenching technology with SF₆ gas insulation. It is designed as a three-phase, 50Hz system rated for 12kV. The sealing performance of the inlet and outlet bushings has been significantly improved, ensuring excellent overall airtightness. This effectively prevents any internal SF₆ gas leakage and guarantees immunity to external environmental factors. Additionally, the spring operating mechanism delivers exceptional reliability and stability, while the main circuit is optimized for low contact resistance and minimal temperature rise.

Primarily used for making and breaking load curren and interrupting short-circuit current in power systems. Suitable for protection and control in substations, industrial and mining enterprises, and rural distribution networks, especially for applications requiring frequent switching operations.

The unit fully complies with State Grid's primary-secondary integration technical requirements, as well as China Southern Power Grid's technical specifications for 10kV automated vacuum pole-mounted circuit breaker equipment.

• Comprehensive Protection: Offers over current and zero-sequence protection, with the advanced capability to accurately distinguish between internal and external faults.

• Flexible Installation and Operation: The product can be conveniently and flexibly installed either on a pole or on a pedestal. It features a motor-operated spring mechanism and supports electric tripping and closing.

• Reliable Operating Mechanism: Transmission and multi-stage trip system for reliable operation; excellent interruption performance, with the capability to interrupt a 20 kA short circuit current up to 30 times.

• Exceptional External Insulation: The unique silicone rubber bushing structure for incoming and outgoing terminals provides sufficient insulation distance between bushings, ensuring safe and reliable operation.

• Reliable Sealing Performance: Utilizes proven sealing technology to fully encapsulate the main circuit, secondary components, and operating mechanism in SF6 gas (at zero gauge pressure), ensuring exceptional long-term sealing reliability.

• Flexible Installation Options: The product supports both pole-mounted and pedestal-mounted installation methods, providing adaptable deployment solutions.

• Advanced Communication Capabilities: Featuring an aviation socket beneath the operating mechanism for integration with intelligent control systems, it enables full remote functionality, including telecontrol, teleindication, telemetering, and teleadjustment.

Item Name	Unit	Parameter
Rated Voltage	kV	12
Rated Frequency	Hz	50
Rated Current	A	630
Rated Short‑Time Withstand Current (4s)	kA	20
Rated Peak Withstand Current	kA	50
Rated Short‑Circuit Making Current (Peak)	kA	50
Rated Short‑Circuit Breaking Current	kA	20
Number of Rated Short‑Circuit Breaking Current Interruptions	Operations	30
Mechanical Life	Operations	10000
Power Frequency Withstand Voltage (1min)	kV	42/48 (Isolating Contact Gap)
Lightning Impulse Withstand Voltage	kV	75/85
Contact Gap	mm	9±1
Contact Over‑travel	mm	3
Average Opening Speed	m/s	1.2±0.2
Average Closing Speed	m/s	0.8‑1.2
Contact Closing Bounce Time	ms	≤2
3‑Phase Opening Synchronism	ms	≤2
Resistance of Each Conductive Circuit	μΩ	130 (≤200 with Isolator)
Closing Time	ms	20~60
Opening Time	ms	18~60
Rated Power of Energy‑Storage Motor	W	≤40
Phase‑to‑Phase Center Distance Inside Cabinet	mm	135±2
Phase‑to‑Phase Center Distance Outside Cabinet	mm	280±3
Max./Min. Closing Operating Voltage	V	AC/DC220/24
Max./Min. Opening Operating Voltage	V	AC/DC220/24
Max./Min. Motor Operating Voltage	V	AC/DC220/24
Weight	kg	180
Standard SF6	-	GB/T1984
Gas Gauge Pressure	Mpa	"0"