ZN85-40.5 miniaturized vacuum circuit breaker is a compact 40.5kV product designed and developed by our company, which perfectly replaces ABB's VD4-40.5 and HD4-40.5 series withdrawable type circuit breaker. This series includes permanent magnet and spring mechanisms two series and it is an indoor switchgear component for rated voltage 40.5kV and AC frequency 50Hz.

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 Power Frequency Withstand Voltage	kV	95
5	Rated Lightning Impulse Withstand Voltage	kV	185
6	Rated Short-Circuit Breaking Current	kA	25/31.5/40
7	Rated Short-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(Spring Mechanism) 30000(Permanent Magnet Mechanism)
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	0.8±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	30～100
7	Opening Time	ms	20～70
8	Contact Bouncing Duration at Closing Operation	ms	≤3
9	No-Simultaneity of Closing/Opening Operations of 3-Phase	ms	≤2

Product Advantages

ZN85-40.5 miniaturized vacuum circuit breaker has many advantages:

Breaker Performance

E2-C2-M2

Convenient maintenance

the modular mechanism design allows for easy replacement of the closing and opening coils without the need for dismantling other components. This eliminates the need for testing or adjustment after replacement, ensuring users to replace them independently, making subsequent maintenance more convenient. The permanent magnet mechanism has a lifespan of up to 30,000 operations, requiring minimal maintenance.

High Conductivity

The optimized insulated cylinder structure and high-performance flexible connection embedded pole reduce contact resistance, ensuring reliable power supply.

Wide Range of Use

The product is designed to withstand harsh environments, including temperatures as low as -25°C, and meets the operational requirements for altitudes up to 2000 meters.

Cost-Effective

Compared to the high-priced VD4-40.5 series products on the market, our ZN85G-40.5 offers a high cost-performance ratio, making it an economical choice.

Product Applications

ZN85-40.5 miniaturized vacuum circuit breaker

has many applications:

New energy fields (photovoltaic, wind power)

Industrial fields (chemical industry, steel, petroleum, coal, etc.)

Power grid systems

Power infrastructures

VD4-40.5 series cabinet retrofit projects