Origin	China
Model Number	VMD5
Brand Name	MINGDE

General  Profile

The VMD5 series medium voltage circuit breaker is our independent developed new generation 40.5 kv vacuuum circuit breaker. Its main characters as follows: the conductance circuit is installed in an three-phase insulating sleeve , its mechanism and conductance circuit adopts front and rear layout. And the mechanism is our deveoped new design, with simple construction, reliable operation All the technical parameters of breaker completely satisfy the Standards Of GB1984 AC Highvoltage Breaker, GB/T 11022 -1999 Common Specifications For High-Voltage Switchgear And Controlgear Standards, China Power Sector Standards DL403. Also meet the requirements of IEC62271-100, IEC56 and other main industrialized country’s similar standards It is universally used in power plant , electric network , metallurgy industry petrochemical industry and infrastructures,such as airport , subway, building. VMD5 circuit breaker possesses perfect mechanical and electric interlock equipment , meanwhile ,its high reliable operating performance and mechanical life , coodinated with matched switchgear cabinet ,to ensure normal power distribution , operator and equipment’s safety.

Technical Parameter

NO	Item					Unit	Technical Date
1	Rated voltage					KV	40.5
2	Rated insulating level		Rated short time power frequency withstand voltage(1min)				95
			Raed lighting inpulse withstand voltage (peak value)				185
3	Rated Frequency					HZ	50/60
4	Rated current					A	630	630	1250
							1250	1250	1600
							　		2000
									2500
5	Rated short circuit breaking current					KA	20	25	31.5
6	Rated short time withstand current						20	25	31.5
7	Rated peak withstand current						50	63	80
8	4S rated short-time withstand current						20	25	31.5
9	Rated shock steady current						50	63	80
10	Rated short-circuit closing current (peak value)						50	63	80
11	Duration of rated short-circuit current					S	4
12	Mechanical life					Times	10000/30000/60000
13	Rated making surge current of capacitor bank					KA	12.5(The frequency is less than 1000Hz)
14	Rated breaking current of single/symmetrical capacitor bank					A	630/400
15	Breaking times at rated short-circuit current					Times	20
16	Power frequency withstand voltage of secondary circuit					V	2000
17	Rated operating voltage						AC110/220		DC110/220
18	Rated operating order					　	O-0.3s-CO-180s-CO
19	Energy storage times					S	≤15
20	Contactor space					mm	20± 2
21	Contacting travel						6 ± 1
22	Phase clearance						300
23	Bounce time of Contactor during making					ms	≤3
24	Different time of breaking / making of 3 phases						≤2
25	Average breaking speed					m/s	1.5-1.9
26	Average making speed						0.6-1.3
27	Making time					ms	30-80
28	Brealing time						20-45
29	Rebound amplitude of contact breaking					mm	≤3
30	Permitted abrasion thickness of moving and fixed contacts						3
31	Conductance circuit resistance					µΩ	Hndcart way		Rated current
							≤45		less than 1250A
							≤35		1600-2000A
							≤25		less than 2500A
											The average breaking speed refers to the average speed of contactor’s first 12mm, and the average making speed is that of contactor’s last 12mm.