VSM-12 indoor permanent magnetic vacuum circuit breaker is used for rated voltage 12kV, AC 50/60Hz indoor switchgear, adopting monostable permanent magnetic actuator, frame one-piece layout, suitable for all kinds of industrial and mining enterprises, power grid equipment, trolley unit and KYN28A-12 switchgear supporting the use of the unit, but also can be used as a fixed unit with the corresponding position interlocking, used in the XGN2 and other Fixed cabinet.

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
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
7	Rated Short-Circuit Making Current (Peak)	kA	63/80/100
8	Rated Withstand Current (Peak)	kA	63/80/100
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 O-180s-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	0.6±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)
6	Closing Time	ms	30～70
7	Opening Time	ms	15～50
8	Contact Bouncing Duration at Closing Operation	ms	≤3
9	No-Simultaneity of Closing/Opening Operations of 3-Phase	ms	≤2

Product Advantages

VSM-12 indoor permanent magnetic vacuum circuit breaker has many advantages:

Performance of circuit breaker：

E2-C2-M2

Stable and reliable:

the most monostable permanent magnetic actuator mechanism, the framework of the integrated layout, compared with the spring actuator mechanism to reduce about 60% of the parts of the mechanism, reducing the vast majority of mechanical failures, safe and reliable.

Good insulation performance:

the main conductive circuit adopts APG high-strength epoxy resin composite insulation type, with higher than the IEC standard insulation performance.

Wide range of use:

series products cover a wide range, from rated current 630A to rated current 4000A, from rated breaking current 20KA to 40kA comprehensive coverage; cover all environments within the altitude of 4500 metres.