VCB (Vacuum Circuit Breaker)
MOBY vacuum circuit breakers are engineered for heavy-duty primary distribution networks, industrial substations, and critical manufacturing continuous operations. Manufactured with high-dielectric vacuum interrupters, our VCB units provide arc-quenching within half a cycle, eliminating fire hazards and drastically reducing contact erosion for 30,000+ mechanical switching cycles.
Comprehensive Technical Specifications
Detailed parameter ratings, insulation limits, standards compliance, and fabrication tolerances engineered for VCB (Vacuum Circuit Breaker).
| Technical Parameter | Engineering Specification | Compliance Standard / Condition |
|---|---|---|
| 🔷 General Electrical Parameters | ||
| Rated Nominal System Voltage | 3.3 kV / 6.6 kV / 11 kV / 33 kV | IS / IEC 62271-100 |
| Highest System Voltage | 3.6 kV / 7.2 kV / 12 kV / 36 kV | IEC 62271-1 |
| Rated Continuous Current | 400A / 630A / 800A / 1250A / 1600A / 2000A | IS 13118 |
| Rated Frequency | 50 Hz ± 3% | National Grid Standard |
| Number of Phases / Poles | 3-Phase, 3-Pole Gang Operated | Standard Specification |
| Rated Symmetrical Breaking Current | 25 kA / 26.3 kA / 31.5 kA / 40 kA rms | CPRI Type Tested |
| Rated Making Current (Peak) | 62.5 kA / 66 kA / 78.75 kA / 100 kA peak | IEC 62271-100 |
| Short-Time Withstand Duration | 3 Seconds (Standard) | IS 13118 |
| Operating Sequence | O - 0.3s - CO - 3min - CO | Standard Auto-Reclose |
| 🔷 Dielectric Insulation Levels | ||
| Rated Lightning Impulse Withstand (BIL) | 75 kVp (12kV) / 170 kVp (36kV) | IEC 60071-1 |
| One-Minute Power Frequency Withstand | 28 kV rms (12kV) / 70 kV rms (36kV) | IS 13118 |
| Insulation Medium | Air insulated cubicle with Vacuum Interrupter bottle | Hermetically Sealed |
| Arc Quenching Medium | High-vacuum bottle (< 10⁻⁷ mbar) | Zero Gas Emission |
| 🔷 Mechanical & Operational Data | ||
| Operating Mechanism | Motorized Spring-Charged / Manual Spring Close & Trip | Stored Energy Type |
| Spring Charging Motor Voltage | 24V / 30V / 110V / 220V DC or 230V AC | Field Selectable |
| Shunt Trip / Closing Coil Voltage | 24V / 30V / 110V / 220V DC | Standard Tripping |
| Mechanical Endurance Class | M2 Class (> 10,000 Operations without maintenance) | IEC 62271-100 |
| Electrical Endurance Class | E2 Class (Extended electrical endurance without restrike) | IEC 62271-100 |
| Degree of Enclosure Protection | IP4X (Indoor Cubicle) / IP55 (Outdoor Kiosk) | IS / IEC 60529 |
| 🔷 Cubicle & Constructional Details | ||
| Enclosure Sheet Thickness | 2.0 mm CRCA Frame / 2.5 mm Load-Bearing Structure | IS 513 |
| Surface Treatment | 7-Tank Pretreatment & Electrostatic Pure Polyester Powder Coat | RAL 7032 / 7035 |
| Busbar Material | Electrolytic Grade E91E Aluminium or 99.9% ETP Copper | IS 5082 / IS 613 |
| Interlocks | Comprehensive Mechanical & Electrical Safety Interlocks | Fail-Safe Design |
| Cubicle Configurations | 1 Incomer + 2 Outgoing / Bus Coupler / Single Incomer | Tailored to Layout |
Key Engineering & Operational Features
Why electrical consultants, industrial plants, and utility engineers specify MOBY VCB (Vacuum Circuit Breaker).
Rapid Arc Extinction
Vacuum interrupter contacts separate and quench the arc inside half an electrical cycle with virtually zero contact erosion and no toxic SF6 greenhouse gases.
Fail-Safe Interlocking
Strict mechanical and electrical interlocks prevent racking in/out when breaker is closed, door opening when energized, and earthing under live line.
Effortless Cassette Drawout
Breaker truck features robust lead-screw rack-in mechanism with clear Test, Service, and Disconnected positions indicated both mechanically and via microswitches.
High Mechanical Endurance
Tested to M2 mechanical endurance standards exceeding 10,000 operating cycles without recalibration, providing 25+ years of dependable industrial service life.
Integrated Protection & Metering
Pre-wired for numerical overcurrent, earth fault, differential relays, and Class 0.2S multi-function digital meters with SCADA Modbus output.
Compact Indoor Footprint
High-density sheet steel fabrication allows multi-tier or ultra-compact cubicle arrangements, minimizing expensive substation civil engineering footprint.
Certified Quality & Factory Testing Standards
Every VCB (Vacuum Circuit Breaker) is manufactured under strict ISO 9001:2008 quality control protocols and subjected to comprehensive routine testing at our Kolkata facility before dispatch.
Target Industrial Sectors & Deployment Scenarios
Engineered and tested for severe continuous operational duty across diverse sectors:
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Frequently Asked Questions
Authoritative engineering answers regarding voltage ratings, CPRI testing, custom SLD fabrication, and warranty for VCB (Vacuum Circuit Breaker).
What are the technical voltage and breaking ratings for MOBY VCB (Vacuum Circuit Breaker)? +
Primary Parameter Ratings: MOBY VCB (Vacuum Circuit Breaker) is engineered for rated voltage 6.6 kV / 12 kV / 36 kV and rated normal current 400A / 630A / 800A / 1250A / 2000A. It is built to withstand prospective short-circuit breaking currents up to 40 kA for 3 seconds, fully adhering to national and international power engineering guidelines.
Is MOBY VCB (Vacuum Circuit Breaker) CPRI tested and certified? +
Certification & Type Testing: Yes, MOBY VCB (Vacuum Circuit Breaker) is CPRI Tested & Approved. All switchgears undergo comprehensive type-testing at the Central Power Research Institute (CPRI) and are routine tested (high-voltage dielectric withstand, contact resistance, and operational timing) at our ISO 9001:2008 certified Kolkata manufacturing facility prior to customer dispatch.
Can this equipment be customized according to our single-line diagram (SLD)? +
Custom Engineering Capabilities: Yes, Moby Electrotech specializes in custom-engineered electrical switchgear systems. Our Kolkata engineering team customizes incoming/outgoing feeder arrangements, CT/PT ratios, numerical protection relays, busbar ratings, enclosure dimensions, and ingress protection (IP42 to IP55) to match your exact site layout and SLD.
What is the standard warranty and quotation timeline for VCB (Vacuum Circuit Breaker)? +
Commercial Terms & Warranty: All MOBY equipment carries an engineering equipment warranty of 12 months from commissioning or 18 months from delivery. Technical commercial quotations are typically provided within 24 to 48 hours following single-line diagram (SLD) review.
Request Technical Quote for VCB (Vacuum Circuit Breaker)
Our senior electrical engineering team will review your single-line diagram (SLD), system voltage, and breaking requirements to provide a competitive quotation within 24 hours.