Yfzn (ZN) -24-Small Size Light Weight Vacuum Circuit Breaker

Model NO.: YFZN(ZN)-24D/T630-25-G


Operation: Electric Type


Arc-extinguishing Medium: Vacuum


Poles Number: 3


Function: OVP(Overvoltage Protection)


Environment: Indoor


Trademark: YF




Breaking Capacity: High Voltage Circuit Breakers


Speed: High-Speed Circuit Breaker


Installation: Fixed


Type: Circuit Breaker


Certification: ISO9001-2000, CE


Test Equipment: IEC Standard


Origin: Jiangyin Yunfeng, China


Product Overview

YFZN(ZN)-24/T630-25 indoor AC HV Vacuum Circuit Breaker with disconnector(disconnector can be also removed and its appearance is similar to the traditional ZN 28 circuit breaker. It is used for the fixed HV cabinet such as KGN and XGN, ect) is applied in the AC 50 Hz network with the rated voltage 24kV. It is a vacuum circuit breaker with obvious isolating fracture in conformity to GB1984-2003. It can be also applied to the power system as an independent electrical unit for breaking load current, overload current and short-circuit current. The obvious isolating fracture can guarantee the safety of construction personnel working on the HV power grid. It is particularly applied at the site without oilation, free of maintenance and required for frequent operation.



Model Specification





Characteristics

a.small size

b.simple but reasonable structure

c.small operation force

d.reliable performance

e.convenient maintenance



Service Conditions

1.Altitude:2000m;

2.Ambient temperature-25ºC-+ 40ºC;

3.The daily average of relative humidity shall not be larger than 95% and the monthly average shall not be larger than 90%:

4.The ambient air shall not be subject to the obvious pollution such as corrosive or combustible gas and steam;

5.The site without fire hazards and explosion hazards;

6.The site that the seismic intensity does not exceed degree 8; the gradient shall not exceed 5°







Main Technical Parameters

Serial No.	Item	Unit	Vacuum Circuit Breaker with Disconnector
1	Rated voltage	kV	24
2	Rated frequency	Hz	50
3	Rated current	A	630
4	Rated short-circuit breaking current	kA	25
5	Rated short-circuit making current	kA	63
6	Rated peak withstand current(dynamic stability current)	kA	63
7	Rated short-time withstand current(dynamic stability current)/duration	kA/s	25/4
8	1min power-frequency withstand voltage(effective value) to earth, phase-to-phase,vacuum fracture/isloating fracture	kV/kV	65/79
9	Full-wave lightning impulse withstand voltage(peak)to earth,phase-to-phase,vacuum fracture/isolating fracture	kV/kV	125/145
10	Main loop resistance	μΩ	≤80
11	Rated breaking current of single capacitor bank	A	630
12	Rated back-to-back breaking current of capacitor bank	A	400
13	Mechanical life	Time	10000
14	Clearance between open contacts	mm	12±1
15	Overtravel of contact	mm	4±1
16	Average opening speed	m/s	1.1-1.7
17	Average closing speed	m/s	0.8-1.2
18	Rated contact pressure	N	2500±200
19	Contact closing bounce time	ms	≤2
20	Three-phase opening and closing asynchronization	ms	≤1
21	Inter-pole center distance	mm	275±2
22	Gross thickness of contact wear	mm	3
23	Distance between live parts and of phase to earth	mm	≥180
24	Closing operation torque of vacuum arc-extinguishing chamber	N.M	≤90
25	Opening operation force of vacuum arc-extinguishing chamber	N	≤10
26	Rated closing operation voltage	V	≌220/-110/~100
27	Rated opening operation voltage	V	≌220/-110/~100

Electrical Parameters of Spring Operation Mechanism Equipped with YFZN(ZN)-24D/T630-25-G Vacuum Circuit Breaker

Permant-magnet Single-phase DC Energy Closing Motor

Rated Voltage	Rated Output Power	Normal Operating Voltage Range
AC/DC 220V	≤70W	85%-110% of rated voltage

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Product Categories : 24kV Indoor HV Load Switch