The OCB2-12/630 type primary and secondary fusion complete set of column mounted circuit breakers is a standardized column mounted switchgear specially designed by DeJishen R&D Center for Chinas distribution network, which is a new generation product developed in line with the development of primary and secondary fusion technology of State Grid Corporation of China. This circuit breaker consists of a switch body, feeder terminals, electromagnetic voltage transformers, connecting cables, etc. It is a column mounted circuit breaker that uses vacuum as the arc extinguishing and insulation medium. It is equipped with high-precision current transformers and electronic voltage sensors to collect three-phase current, zero sequence current, and zero sequence voltage. It is suitable for power systems with a rated voltage of 12kV and a rated frequency of 50Hz. This circuit breaker can control the opening and closing of load current, overload current, and short-circuit current in the power system, and is matched with a primary and secondary fusion feeder terminal FTU to achieve segmentation, division, connection, control, and protection of 10kV distribution lines. It can establish a connection with the operation and maintenance master station through communication methods such as GPRS, Ethernet, and fiber optic, realizing intelligent operation and maintenance of the power grid, improving the quality and efficiency of distribution equipment operation and maintenance, and serving the construction and renovation plans of the distribution network.

Execution standards
GB/T 1984 High Voltage AC Circuit Breakers
GB/T 1985 High voltage AC isolating switches and grounding switches
GB/T 11022 Common Technical Requirements for High Voltage Switchgear and Control Equipment Standards
DL/T 402 Technical Conditions for Ordering High Voltage AC Circuit Breakers
DL/T 403 Technical Conditions for Ordering 12kV~40.5kV High Voltage Vacuum Circuit Breakers
DL/T 593 Common Technical Requirements for High Voltage Switchgear
DL/T 615 Guidelines for Parameter Selection of AC High Voltage Circuit Breakers

Usage conditions
Installation location: Outdoor
Environmental temperature: upper limit 70 ℃, lower limit -40 ℃, daily average temperature not exceeding+35 ℃;
Altitude: not exceeding 3000 meters
Wind pressure: not exceeding 700Pa (equivalent to a wind speed of 35m/s);
Air pollution level: Level IV;
Seismic intensity: not exceeding 8 degrees;
Installation location: A place without flammability, explosion hazard, chemical corrosion, or severe vibration.
Any special conditions beyond the above requirements can be negotiated and determined by the user with our company

Product Model and Definition

Main technical parameters

Serial Number	Parameter		Unit	Parameter values
1	rated voltage		kV	12
2	rated current		A	630
3	rated short circuit breaking current		kA	20
4	Temperature rise test current		-	1.1Ir
5	Rated power frequency for 1 minute Withstand voltage	Relative/phase to phase	kV	42
6		between open contacts	kV	48
7	Rated lightning impulse withstand voltage (1.2/50ms) peak value	Relative/phase to phase	kV	75
8		between open contacts	kV	85
9	Partial discharge (1.1Ur)		pC	≤20
10	Rated short-time withstand current and duration		kA/s	20/3
11	Rated peak withstand current		kA	50
12	Rated short circuit breaking current		kA	20
13	Rated short-circuit closing current		kA	50
14	Main circuit resistance		μΩ	≤80μΩ
15	mechanical stability		次	≥10000
16	Minimum creepage distance of external insulation		mm	372
17	Rated short-circuit breaking current breaking times		次	≥30次
18	clearance between open contacts		mm	8.0-10.0
19	Contact overtravel		mm	2-2.5
20	Contact closing bounce time		ms	≤2
21	Opening and closing at different stages		ms	≤2
22	opening speed		m/s	1.2±0.2
23	closing speed		m/s	0.8±0.2
24	Opening time		ms	18-40
25	close time		ms	25-60
26	Rated operating voltage		V	DC24V (DC48V,110V,220V;AC220V可選）
27	degrees of protection provided by enclosure		-	IP65