Dongfa Intelligent, a 40.5kV Indoor High Voltage Vacuum Circuit Breaker manufacturer, supplies this breaker for indoor 40.5kV, 50Hz high-voltage distribution systems. It is used for circuit switching and short-circuit fault current interruption and is typically installed in a handcart-type configuration inside high-voltage switchgear, working with the cabinet, protection devices, and control circuits. Selection requires confirming rated current, short-circuit breaking current, insulation level, control voltage, and capacitor bank switching requirements.
Compared with 12kV products, the 40.5kV indoor VCB suits higher-voltage distribution systems. It offers 1250A, 1600A, and 2000A rated current options, with 25kA and 31.5kA short-circuit breaking capacities. Flexible selection matches different loads and fault levels.
Opening time directly affects protection speed. ≤80ms helps quickly isolate faults, reducing equipment damage and outage scope. With the O-0.3s-CO-180s-CO operating sequence, it meets most high-voltage distribution requirements.
Built-in capacitor bank switching capability: 630A for single capacitor bank, 400A for back-to-back capacitor bank. No additional dedicated switching device is required, simplifying switchgear design.
AC/DC 110V and 220V operating voltage options adapt to different switchgear control power supplies. For replacement projects, simply confirm the original control voltage to select the corresponding configuration.
Dongfa Intelligent factory direct, Yueqing high-voltage electrical supply chain, no trader markup. Same GB and IEC 62271 compliance, same type test reports, lower quote than European/US brands, more reliable than local assemblers.
Standard products: 7-15 working days. Custom products: 15-30 working days. Standard products support 1-unit trial order. Every unit must pass resistance test, mechanical operation test, withstand voltage test, and vacuum degree inspection before shipment.
The 40.5kV Indoor High Voltage Vacuum Circuit Breaker is widely used in substation medium-voltage sections, industrial and mining enterprise high-voltage distribution rooms, and high-voltage distribution in large commercial buildings. The handcart design simplifies maintenance and replacement, reducing downtime.
With 630A single capacitor bank and 400A back-to-back capacitor bank breaking capability, it suits substation reactive power compensation, filter branches, and frequent switching applications.
In renewable energy step-up stations, mining power supply, and industrial production lines, the 40.5kV indoor VCB handles circuit switching and fault protection. Products have been exported to Southeast Asia and parts of Europe, used in power utilities, power plants, and mining enterprises.
| Parameter | Specification |
| Product Type | Indoor High Voltage Vacuum Circuit |
| Rated Voltage | 40.5kV |
| Rated Frequency | 50Hz |
| Rated Current | 1250A / 1600A / 2000A |
| Rated Short-Circuit Breaking Current | 25kA / 31.5kA |
| Rated Short-Circuit Making Current (Peak) | 63kA / 80kA |
| Rated Short-Time Withstand Current, 4s | 25kA / 31.5kA |
| Rated Peak Withstand Current | 63kA / 80kA |
| Power-Frequency Withstand Voltage, 1 min | 95kV |
| Lightning Impulse Withstand Voltage (Peak) | 185kV |
| Rated Operating Sequence | O-0.3s-CO-180s-CO |
| Short-Circuit Breaking Operations | 20 |
| Mechanical Life | 10,000 operations |
| Opening Time | ≤80ms |
| Rated Single Capacitor Bank Breaking Current | 630A |
| Rated Back-to-Back Capacitor Bank Breaking Current | 400A |
| Rated Operating Voltage | AC/DC 110V, AC/DC 220V |
| Installation | Handcart type, for switchgear |
This 40.5kV Indoor High Voltage Vacuum Circuit Breaker supports capacitor bank switching: rated single capacitor bank breaking current 630A, rated back-to-back capacitor bank breaking current 400A. Suitable for substation reactive power compensation, filter branches, and frequent capacitor switching. Please provide capacitor bank configuration and switching requirements during selection.
To confirm compatibility, please provide: original breaker model, switchgear information, control voltage, mounting dimension drawings, main electrical parameters, and quantity. The Dongfa Intelligent technical team will review before production to avoid mismatch.
Dongfa Intelligent was founded in 2012 in Yueqing Economic Development Zone, Wenzhou, Zhejiang — China's high-voltage electrical industrial hub. 14 years focused on R&D and manufacturing. Own factory over 2,000m², 17 employees, 4 technical engineers, 2 production lines, 1 set of testing equipment. Monthly capacity: 600-700 units. Annual capacity: 7,000-8,000 units.
ISO 9001, ISO 14001, ISO 45001 certified. CNAS/AF recognized testing capability. Compliant with GB standards and IEC 62271. Core products come with type test reports. Factory audit supported.
Product range includes indoor high-voltage vacuum circuit breakers, outdoor high-voltage isolating vacuum load switches, indoor high-voltage load switches, indoor and outdoor high-voltage disconnectors, and various high- and low-voltage non-standard coils. Products exported to Southeast Asia and parts of Europe, used in power utilities, power plants, mining enterprises, etc.
A: Indoor products are installed inside switchgear, relying on the cabinet for protection and insulation distance. Outdoor products must withstand rain, dust, and temperature extremes, with dedicated outdoor design for insulation, sealing, mechanism protection, and mounting. Application scenarios and selection logic differ.
A: The handcart-type breaker can be racked in and out of the switchgear for maintenance, replacement, and testing. Compared with fixed installation, it reduces downtime. For replacement projects, simply confirm the switchgear model and handcart compatibility.
A: Yes. The 40.5kV Indoor High Voltage Vacuum Circuit Breaker offers 630A single capacitor bank breaking current and 400A back-to-back capacitor bank breaking current. Please provide capacitor bank configuration and switching requirements during selection.
A: AC/DC 110V and 220V operating voltage options are available. Select according to switchgear control power. For replacement projects, confirm the original control voltage.
A: Please provide original breaker model, switchgear information, control voltage, mounting dimension drawings, main electrical parameters, and quantity. We will review compatibility before production.
A: Opening time is the duration from receiving the opening signal to arc extinction. ≤80ms helps quickly isolate faults, reducing equipment damage and outage scope, meeting most high-voltage distribution protection requirements.
A: 10,000 operations suits most indoor high-voltage distribution scenarios. Based on daily operation frequency, e.g., 5 operations per day supports about 5.5 years; 2 operations per day supports about 13 years. Actual maintenance cycle depends on environment and frequency.
A: Dongfa Intelligent is a 2,000+ m² own factory in Yueqing, Zhejiang, founded in 2012, 14 years of manufacturing experience. Factory audits are supported. You are welcome to visit.
A: Standard products support MOQ 1 unit. Standard lead time: 7-15 working days. Custom products: 15-30 working days. Urgent orders can be prioritized.
A: Please provide rated current, short-circuit breaking current, control voltage, capacitor bank switching requirements, switchgear information, and quantity. Drawings recommended for replacement projects.
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Please provide: Rated Current + Short-Circuit Breaking Current + Control Voltage + Capacitor Bank Requirements + Switchgear Information + Quantity.
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No. 281, Wei 18th Road, Yueqing Economic Development Zone, Yueqing, Wenzhou, Zhejiang, China
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