1. Products Description

ZN85B-40.5 miniaturized indoor vacuum circuit breaker is a miniaturized 40.5kV product designed and developed by our company. It can perfectly replace the VD4-40.5 and HD4-40.5 series floor trolleys produced by ABB. This series mainly includes two series: permanent magnet mechanism and spring mechanism. It is a rated voltage 40.5KV, AC 50HZ indoor switchgear component.

2. Main technical parameters

Table 1 Main Performance Parameters of Circuit Breakers

S.N	Item name			Unit	Parameter
1	Rated voltage			kV	40.5
2	Rated insulation level	Lightning Impact Withstand Voltage			185(Interphase, to ground) 215(fracture)
		Power frequency withstand voltage(1min)			95
3	Rated frequency			Hz	50
4	Rated current			A	630	1250
5	Rated short circuit breaking current			kA	31.5
6	Rated operating sequence				O-0.3s-CO-180s-CO
7	Rated short circuit making current(peak)			kA	80
8	Rated peak withstand current (rated dynamic stability current)				80
9	Rated short-time withstand current (rated thermal stability current)			kA	31.5
10	Rated short-circuit duration (rated thermal stabilisation time)			s	4
11	Opening and closing individual capacitor bank current			A	400
12	Rated out-of-step breaking current			kA	6.3
13	Cumulative number of openings at rated short-circuit breaking current			times	8
14	Cumulative number of openings at rated current			times	3000
15	mechanical life			times	10000
16	Rated pressure of sulphur hexafluoride gas (gauge pressure at 20°C)			MPa	0.65
17	Sulphur hexafluoride gas blocking pressure (gauge pressure at 20°C)				0.59
18	Annual air leakage rate			%/year	≤1
19	Sulphur hexafluoride gas moisture content (at 20°C)			ppm (V/V)	≤150
20	Rated operating voltage			V	AC/DC: 110/220
21	Weight		circuit breaker body	kg	130
			Sulphur hexafluoride gas		1.5

Table 2 Assembly adjustment parameters for circuit breakers

S.N	Item name	Unit	Data
1	Total travel of the conductive rod	mm	61±2
2	contact opening distance	mm	40±2
3	overstroke	mm	20±2
4	Closing time	ms	40≤t≤100
5	Opening time	ms	25≤t≤60
6	Closing bounce	ms	≤2
7	Opening bounce	mm	≤2
8	Rigid closing speed(18-0mm)	m/s	2.1±0.2
9	Rigid opening speed(0-18mm)	m/s	2.3±0.2
10	Three-phase switching and closing non-simultaneity	ms	≤2
11	Dimension of the upper end of the conductive rod from the upper end of the insulating cylinder in the electrically closed position A	mm	84±1.5
12	Minimum air insulation distance	mm	300
13	Conducting main circuit DC resistance per phase	μΩ	≤80

3.Scope of application

ZN85B-40.5 miniaturized indoor vacuum circuit breaker has many applications:

Installation method: floor-standing trolley

Applicable cabinet: Applicable to KYN61 switch cabinet with a width of 1200mm

Product compliance standards: GB/T1984-2014, GB/T11022-2011.

4.Product advantage

ZN85B-40.5 miniaturized indoor vacuum circuit breaker has many advantages:

1. Circuit breaker performance: E2-C2-M2

2. Simple and convenient maintenance: The spring mechanism adopts a modular mechanism. The replacement of the closing and opening coil does not require the removal of other components. The user can easily replace it, and no test and adjustment are required after replacement, making the later operation and maintenance more convenient. The life of the permanent magnet mechanism can reach 30,000 times, and it is basically maintenance-free.

3. High conductivity: The optimized insulation cylinder structure and high-performance soft connection sealed pole are adopted to reduce contact resistance and ensure power supply reliability.

4. Wide range of use: Adapt to harsh environments, the product can withstand low temperatures of minus 25℃. Meet the use requirements of 2000 meters above sea level.

5. Economical and affordable: Compared with the high-priced VD4-40.5 series products on the market, our company's ZN85G-40.5 is economical and cost-effective.