Outdoor High-Voltage Vacuum Circuit Breaker ZW7-40.5

Overview:

The ZW7-40.5 outdoor high-voltage vacuum circuit breaker is designed for three-phase power systems with an AC frequency of 50Hz and a rated voltage of 40.5kV. It is primarily used for breaking and closing load currents, overload currents, and short-circuit currents.

Environmental Conditions:

Air temperature: upper limit +40°C, lower limit -30°C;
Altitude: ≤2000 meters (if a higher altitude is required, the rated insulation level should be correspondingly increased);
Wind pressure: not exceeding 700Pa (equivalent to a wind speed of 34m/s);
Seismic intensity: 8 degrees;
Pollution level: Grade III;
Maximum daily temperature variation: not exceeding 25°C.

Main Features:

Utilizes vacuum for arc extinguishing, offering strong breaking capacity, long electrical lifespan, and a mechanical lifespan of 10,000 operations;
Simple structure, maintenance-free, with a long interval between overhauls;
Excellent insulation performance with strong pollution resistance;
Can be equipped with either spring or electromagnetic operating mechanisms, offering reliable mechanical performance and suitability for frequent operations;
No risk of fire or explosion;
Built-in current transformer with a calculation accuracy of 0.2, enabling three-phase interactive protection;
Equipped with a condensation controller, ensuring reliable operation of the circuit breaker under specific temperature and humidity conditions.

Item	Unit	Parameter
Rated Voltage	kV	40.5
Rated Insulation Level
Power Frequency Withstand Voltage
Dry	kV	95
Wet	kV	80
Lightning Impulse Withstand Voltage (Peak)	kV	185
Rated Current	A	1250, 1600, 2000
Rated Short-Circuit Breaking Current	kA	20, 25, 31.5
Rated Operating Sequence		Open-0.3s-Close Open-180s-Close Open
Rated Short-Circuit Current Breaking Times	Times	12
Rated Short-Circuit Closing Current (Peak)	kA	50, 63, 80
Rated Peak Withstand Current	kA	50, 63, 80
Rated Short-Time Withstand Current	kA	20, 25, 31.5
Rated Duration of Short-Circuit Current	s	4
Average Opening Speed	m/s	1.5 ± 0.2
Average Closing Speed	m/s	0.7 ± 0.2
Contact Closing Bounce Time	s	≤2
Three-Phase Synchronization Time Difference	s	≤2
Closing Time	s	≤150
Opening Time	s	≤60
Mechanical Lifespan	Times	10,000
Rated Operating Voltage and Auxiliary Circuit Voltage	V	DC 220, 110, 24
Rated Operating Voltage and Auxiliary Circuit Voltage	V	AC 220, 110, 24
DC Resistance of Each Phase Circuit (excluding transformers)	μΩ	≤100
Allowable Wear Thickness of Moving and Static Contacts	mm	3
Weight	kg	800