The new generation ZN85-40.5 vacuum circuit breaker is an upgrade product based on the 35kV vacuum circuit breaker with the 3AV3 mechanism as the main body. It has been fully optimized and upgraded in terms of mechanical transmission, mechanism body, secondary circuit, and other aspects. This product is an indoor switchgear with a rated voltage of 40.5kV and AC 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
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	30～70
7	Opening Time	ms	20～50
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 vacuum circuit breaker has many advantages:

Performance of the circuit breaker

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.

High conductivity performance

It adopts optimized insulated cylinder structure and embedded pole with high performance flexible connections, reducing contact resistance to ensure reliable power supply.

Wide range of applications

Designed to withstand harsh environments, the product can endure temperatures as low as -25°C and meets usage requirements up to an altitude of 2000 meters.