KYN28A-12(GZS1-12Z) mid-set type metal-clad and metal-enclosed switchgear (hereinafter referred to as switchgear) is a new type product designed and developed by our company with domestic and international advanced technologies, it is an ideal upgrading product for replacing the old metal-enclosed switchgear such as KYN1-10, JYN2-10, GBC-10 and so on. Its advantages as follows: 
●  The cabinet shell is made of al-zinc-coated steel sheet, through CNC processing and multiple bending technique, then assembled with bolts. It is featured with high mechanical strength, neat and elegant appearance, powder coating treated door, good shock and corrosion resistance. Ingress protection level of the shell reaches IP4X. 
●  Main switch of switchgear can be configured with VD4 vacuum circuit breaker and C3 series fixed type load switch from ABB corporation, also can be configured with many homemade vacuum circuit breakers (such as VS1, VH1, VK, ZN28) instead of overseas similar products. 
●  No matter which circuit breaker selected, make sure that the air insulation distance of its bare conductor is larger than 125mm, and compound insulation is larger than 60mm. The breakers are featured with long service life, high parameters, less maintenance, small size, etc. 
This switchgear is applicable for three-phase power grid of AC 50Hz and class 3.6~12kV, used for electric energy receiving and distribution, it controls, protects and monitors the circuits, can be used in single bus and single-bus segment system or dual-bus systems. This switchgear complies with IEC298 Alternating-current metal-enclosed switchgear and controlgear for rated voltage above 1kV and up to and including 52kV , IEC694 Common specifications for high-voltage switchgear and controlgear, GB3906 Alternating-current metal-enclosed switchgear for rated voltage of 3~36kV, DL404 Indoor AC high voltage switchgear panel, DIN.VDE0670 Alternating-current switchgear for rated voltage above 1kV, etc. It enjoys perfect and reliable anti-misoperation function. 

● Ambient air temperature: -15℃~+40℃;
● Relative humidity: daily mean not over 95%, monthly mean not over 90%;
● Altitude: not exceed 4000m;
● Seismic intensity: not beyond Ms8;
● The installation site should be free of fire, explosive danger, serious pollution, chemical corrosion or severe vibration.
Special requirements beyond above conditions should be determined by both users and manufacturer through negotiation.

Technical parameters of switchgear

Item		Unit	Data
Rated voltage  Rated frequency   Rated current of circuit breaker  Rated current of switchgear  Rated peak withstand current (4s)  Rated peak withstand current (peak)  Rated short-circuit breaking current   Rated short-circuit making current (peak)		KV   Hz   A   A   KA   KA    KA   KA	3.6，7.2，12   50   630，1250，1600，2000，2500，3150，4000   630，1250，1600，2000，2500，3150，4000   16，20，25，31.5，40，50，63   40，50，63，80，100，125，160   16，20，25，31.5，40，50，63   40，50，63，80，100，125，160
Rated insulation level	1min power frequency withstand voltage Lightning impulse withstand voltage	KV   KV	24   40	32   60	42   75
Protection class		The shell is IP4X, and it is IP2X when the compartment door and circuit breaker chamber door are opened

Technical parameters of VD4 and VS1-12 vacuum circuit breaker 

Item		Unit	Data
Rated voltage  Rated frequency  Rated current of circuit breaker  Rated peak withstand current (4s)  Rated peak withstand current (peak)  Rated short-circuit breaking current  Rated short-circuit making current (peak)		KV   Hz   A   A   KA   KA    KA   KA	3.6，7.2，12   50   630，1250，1600，2000，2500，3150，4000   16，20，25，31.5，40，50，63   40，50，63，80，100，125，160   16，20，25，31.5，40，50，63   40，50，63，80，100，125，160
Rated insulation level	1min power frequency withstand	KV   KV	42 75
Rated operating sequence  Rated short-circuit current breaking times  Mechanical life		Times  Times			O-0.3s-CO-180s-CO   50   2000

Mechanical characteristics of VD4 and VS1-12 vacuum circuit breaker 
When the circuit breaker is used to control the motor of 3~10kV, must apply metal-oxide arrester if the starting current is smaller than 600A, details should be determined by both users and manufacturer through negotiation. When the circuit breaker is used to disconnect the capacitor bank, rated current of the capacitor bank should not exceed 80% of rated current of circuit breaker.

Item		Unit	Data
Clearance between open contacts  Overtravel  Phase-to-phase central distance  Closing contact bounce time  Three-phase opening asynchrony		mm   mm   mm   ms   ms	11±1   4±0.5    210±0.5，250±0.5，275±0.5    ≤2   ≤2
Breaking time at operating voltage of	Max   Rating   Min	ms   ms	≤50   ≤50   ≤60
Closing time  Average closing speed  Average closing speed  Conductive circuit resistance  Contact pressure		ms   m/s   m/s   μΩ   N			≤100   0.9-1.2   0.6-0.8   ≤40   3200±100

Technical parameters of operating mechanism 

Item		Unit	Value
Rated operating voltage	Closing coil	V	DC220,110
	Closing coil	V	DC220,110
Coil power	Closing coil	W	245
	Closing coil	W	245
Power of energy-storage motor  Rated voltage of energy-storage motor  Energy-storage time		W   V   S	50   DC220,110   ≤10

Main technical parameters of ZN□-12 (VHI) vacuum circuit breaker

Item	Unit	Parameter
Rated voltage  Rated frequency  Rated current  Rated short-circuit breaking current  Rated short-circuit making current  Rated peak withstand current  Rated short-time withstand current  Rated short-circuit duration  Rated breaking current of single capacitor bank  Rated breaking current of back-to-back capacitor bank  Power frequency withstand voltage  Lightning impulse withstand voltage  Rated short-circuit current breaking times  Mechanical life	KV   Hz   A   KA   KA   KA   KA   s   A   A   KV   KV   Times  Times	12   50   1250   31.5   80   80   31.5   4   630   400   42   75   50   1000
Rated operating sequence		O-0.3S-CO-180s-CO
Opening time  Closing time  Control voltage   Power of closing coil   Power of opening coil	ms   ms   V   VA   VA