12KV Indoor Medium Voltage Vacuum Circuit Breaker (VCB) – MV VCB

Description

The 12KV Indoor Medium Voltage Vacuum Circuit Breaker (VCB) is designed for indoor switchgear in 12KV power systems. It serves as a reliable protection and control unit for power grid equipment and industrial and mining enterprises. This circuit breaker is suitable for switching various loads of different natures, frequent operations, and multiple interruptions of short-circuit currents.

Key Features:

1. The VCB utilizes solid-sealed pole poles from international brands for its primary part, and the vacuum interrupter and main conductive circuit parts are solid-sealed into a whole, offering enhanced protection against impact, dust, and condensation.
2. The breaker demonstrates strong environmental adaptability, significantly reducing operation and maintenance costs.
3. The operating mechanism is integrated with the circuit breaker body and has been verified through type tests.
4. It boasts an E2 electrical life and M12 mechanical life, ensuring long-lasting performance and reliability.

Environmental Requirements:

1. Ambient temperature: Highest temperature +40°C, Lowest temperature -15°C.
2. Environmental humidity: Daily average relative humidity ≤ 95%, Monthly average relative humidity: ≤ 90%, Daily average vapor pressure ≤ 22×10^-3MPa, Monthly average vapor pressure ≤ 1.8×10^-3MPa.
3. Altitude: Not more than 1000m.
4. The earthquake intensity does not exceed 8 degrees.
5. The surrounding air should not be significantly polluted by dust, smoke, corrosive and/or flammable gas, steam, or salt spray.

Note: If the operating environment exceeds the specified conditions above, it is essential to consult with the manufacturer for appropriate arrangements.

	Item		Unit	Data
1	Rated voltage			12
2	Maximum working voltage		kv	12
3	Rated current		A	630  1250	630  1250
4	Rated short-circuit break current		kA	20/25	31.5
5	Rated short-circuit close current (peak value)		kA	50/63	80
6	Rated withstand current (peak value)		kA	50/63	80
7	4S Rated little withstand current		kA	20/25	31.5
8	Rated insulation level	Industrial frequency withstand voltage	kA	42/48
		Thunder impulse withstand voltage		75/85
9	Rated operation order			Off-0.3S on and off-180S-on and off
10	Mechanical life		times	10000
11	Rated short-circuit current break and close time		times	50
12	Speak and move organization amount assign the current of the floodgate(DC)		V	AC.DC.110,220
13	Speak and move organization amount equal to  the current of the floodgate(DC)		V	AC.DC 110,220
14	Switching distance of the contact		mm	>11
15	Ultra journey(touches the head spring and compress length)		mm	4+/-0.5
16	Three-phase breaking into  shut floodgate sex of the same period		ms	<2
17	Touch the head and shut a  floodgate of time of bouncing		ms	<2
18	Average speed of breaking brake		m/s	0.9~1.7
19	Average speed of closing brake		m/s	0.6~1.0
20	Time of breaking brake	Operate it under the voltage highest	s	<0.05
		Operate it under the voltage lowest		<0.08
21	Time of closing brake		s	<0.1
22	Each the resistance of main return circuit		u  Ω	<45
23	Allowance abrasion cumulated thickness of the moving and stationary contact		mm	3

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