ZN85-40.5K vacuum circuit breaker is an indoor switch equipment for rated voltage 40.5kV and AC frequency 50/60Hz. It adopts an integrated frame operating mechanism and is suitable for various industrial and mining enterprises, as well as power grid equipment, equipped with corresponding mechanical interlocking, and compatible with fixed cabinets such as XGN2.

Product Specifications

Specification Sheet

No.	Name	Unit	Data
1	Rated Voltage	kV	40.5
2	Rated Frequency	Hz	50
3	Rated Current	A	630/1250/1600/2000/2500/3150/4000
4	Rated PowerFrequency Withstand Voltage	kV	95
5	Rated Lightning Impulse Withstand Voltage	kV	185
6	Rated Short-Circuit Breaking Current	kA	25/31.5/40
7	RatedShort-Circuit Making Current (Peak)	kA	63/80/100
8	Rated Withstand Current (Peak)	kA	63/80/100
9	Rated Duration of Short-Circuit	s	4
10	Operating Cycles at Rated Short-Circuit Breaking Current	Cycles	E2
11	Mechanical Endurance	Times	10000
12	Standard Operating Sequence	-	O-0.3s-CO-180s-CO
13	Allowable Wear Thickness of Contact	mm	≤3

Mechanical characteristics

No.	Name	Unit	Data
1	Clearance between Moved and Fixed Contact	mm	19±2
2	Contact Overtravel	mm	4±1
3	Average Closing Speed	m/s	0.7±0.2
4	Average Opening Speed (Average Speed of First Opening at 12mm)	m/s	1.7±0.3
5	Rated Contact Pressure	N	3100±200N(25kA/31.5kA) 4800±300N(40kA)
6	Closing Time	ms	30～70
7	Opening Time	ms	20～50
8	Contact Bouncing Duration at Closing Operation	ms	≤3
9	No-Simultaneityof Closing/Opening Operations of 3-Phase	ms	≤2

Product Advantages

ZN85-40.5K vacuum circuit breaker has many advantages:

Performance of circuit breaker

E2-C2-M2

Stability and reliability

it adopts the most mature frame-integrated spring operating mechanism, with over 20 years of market usage experience, ensuring safety, reliability, and high market recognition.

Excellent insulation performance

the main conductive circuit adopts APG high-strength epoxy resin composite insulated cylinder, which exceeds the IEC standard in terms of insulation performance.

Wide range of applications

the product series has a wide application range, rated currents from 630A to 4000A, and rated breaking currents from 20kA to 40kA. It is suitable for all environments within an altitude of 2000 meters and operating temperatures from -40°C to 40°C.