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VT19-40.5 High-Voltage Solid-Enclosed Pole Vacuum Circuit Breaker

The VT19-40.5EP indoor high-voltage vacuum circuit breaker is an indoor switching device designed for three-phase AC power systems with a frequency of 50 Hz and a rated voltage of 40.5 kV, serving as the control and protection unit for electrical installations in industrial and mining enterprises, power plants, and substations. Owing to the inherent advantages of vacuum circuit breakers, they are particularly well suited for applications requiring frequent operation at rated current or repeated interruption of short-circuit currents. This circuit breaker complies with the requirements of GB 1984 “High-Voltage AC Circuit Breakers” and JB 3855 “Indoor High-Voltage AC Vacuum Circuit Breakers,” as well as the relevant IEC standards. The circuit breaker features reliable interlocking functions and can be configured either as a handcart unit or as a fixed unit.

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Detailed Introduction Technical Specifications

The VT19-40.5 indoor AC high-voltage (solid-sealed) vacuum circuit breaker is an indoor switchgear used in three-phase AC 50Hz, 35kV power systems, serving as a control and protection unit for electrical facilities in industrial and mining enterprises, power plants, and substations. Due to the special advantages of vacuum circuit breakers, they are particularly suitable for applications requiring frequent operation at rated working current or multiple short-circuit current interruptions. This circuit breaker complies with domestic and international standards such as GB1984, GB/T11022, DL/T403, and IEC62271. The circuit breaker features reliable interlocking functionality and can be used as either a handcart unit or a fixed unit.

Service conditions:

Ambient air temperature
Humidity conditions
+40°C~-15°C
The average daily relative humidity and average daily water vapor pressure are both less than or equal to 95% and 2.2x10MPa respectively
The average monthly relative humidity is less than or equal to 90%
The average value of water vapor pressure is less than or equal to 1.8x10 MPa
Altitude: ≤1000m
Seismic intensity: <8 on the Richter scale

Ambient air requirements:
It is not visibly contaminated by dust, smoke, corrosive and flammable gases, vapors, or salt spray.

Main Technical Parameters of Circuit Breakers

Parameter	Specification
Rated Voltage	40.5 kV
Rated Frequency	50 Hz
Rated Lightning Impulse Withstand Voltage: Phase-to-Phase / Phase-to-Ground / Across the Breaking Gap	185 kV / 215 kV
Rated 1min Power Frequency Withstand Voltage: Phase-to-Phase / Phase-to-Ground / Across the Breaking Gap	95 kV / 110 kV
Rated Operating Sequence	O-0.3s-CO-180s-CO
Rated Current (A)	630, 1250; 1250, 1600, 2000, 2500
Rated Short-Circuit Breaking Current (rms, kA)	20 / 25; 31.5
Rated Short-Circuit Making Current (peak, kA)	50 / 63; 80
Rated Short-Time Withstand Current / Short-Circuit Duration (kA/s)	20, 25 / 4; 31.5 / 4
Rated Peak Withstand Current (kA)	50 / 63; 80
Rated Cumulative Short-Circuit Breaking Operations (times)	50
Mechanical Endurance (operations)	20000
Weight (kg) - Fixed Type	≤ 300
Weight (kg) - Draw-out (Truck) Type	≤ 350

Mechanical Characteristic Parameters of Circuit Breakers

Name	Unit	Data
Contact opening cabinet	mm	18 ± 1
Overtravel	mm	6 ± 1
Three-phase opening and closing failure period	milliseconds	≤ 2
Closing contact bounce time	milliseconds	≤ 3
Closing contact contact pressure	N	20 kA 25 kA 31.5 kA
Closing contact contact pressure	N	2000 ± 200 2700 ± 200 3100 ± 200
Average tripping speed	m/s	1.6 ± 0.2
Average closing speed	m/s	0.7 ± 0.2
Resistance of each phase circuit (excluding the contact arm)	microohm	≤ 40