ZN85-40.5 Indoor medium Voltage Vacuum Circuit Breaker

The ZN85-40.5 solid-sealed trolley-type vacuum circuit breaker is suitable for three-phase AC power systems with a rated voltage of 40.5kV and a frequency of 50Hz. It is widely used in power plants, substations, petrochemical, metallurgy, manufacturing, airports, and residential areas for the protection and control of electrical facilities.

The zn85-40.5 solid-sealed trolley-type vacuum circuit breaker is suitable for three-phase AC power systems with a rated voltage of 40.5 kV and a frequency of 50 Hz. This advanced zn85 model is widely used in power plants, substations, petrochemical, metallurgy, manufacturing, airports, and residential areas for the protection and control of electrical facilities. It is particularly suitable for locations requiring frequent operation at rated current or multiple interruptions of short-circuit current. The breaker is fully interchangeable with VD4 and VEP circuit breakers and can be installed in removable or fixed air-insulated switchgear. For medium-voltage coordination, a 33 kv vcb breaker is often used upstream to provide layered protection.

The zn85 40.5 solid-sealed trolley-type vacuum circuit breaker adopts advanced APG (Automatic Pressure Gelation) technology, which directly encapsulates the vacuum interrupter and the main conductive circuit in an epoxy resin pole column, forming a solid-sealed insulation method. This represents the highest level of design and manufacturing for high-voltage vacuum circuit breakers in the world today. The durability and reliability of the zn85 design make it an ideal companion to systems that integrate a 33 kv vcb breaker for comprehensive grid safety.

195

No.
1			40.5
2			50
3			185
4	Rated Short-Time Power Frequency Withstand Voltage (1 minute)		95
5		A	630,1250,1600	1600,2000,2500
6	Rated Short-Circuit Breaking Current		25	31.5
7	Rated Short-Circuit Making Current (Peak)		63	80
8	Rated Short-Circuit Duration	S	4
6			O-0.3s-CO-180s-CO
10	Rated Breaking Current for Single/Back-to-Back Capacitor Bank	A	630/400
11	Rated Number of Short-Circuit Breaking Operations		30
12			<= 75
13			<= 65
14			10000
15		V	AC220/110 DC220/110
16			18±2
17	Contact Over-Travel		7.5±1.5
18		m/s	0.7±0.2
19		m/s	1.6±0.2
20			<= 3
21	Three-Phase Closing/Opening Asynchrony		<= 2
22		μΩ	<= 50(630A,1250A) <= 35(1600~2000A)<= 30(2500A)

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