LBS (Load Break Switch)
MOBY Load Break Switches (LBS) deliver a dependable, economical, and robust switching solution for HT distribution networks and secondary transformer protection. Built with snap-action spring mechanisms that operate independently of human speed, our LBS units feature integrated earth switches with interlocks and optional high-rupturing-capacity (HRC) striker fuses for instantaneous short-circuit protection.
Comprehensive Technical Specifications
Detailed parameter ratings, insulation limits, standards compliance, and fabrication tolerances engineered for LBS (Load Break Switch).
| Technical Parameter | Engineering Specification | Compliance Standard / Condition |
|---|---|---|
| 🔷 Electrical Characteristics | ||
| Rated Operational Voltage | 6.6 kV / 11 kV / 12 kV / 33 kV / 36 kV | IS 9920 / IEC 60265 |
| Rated Continuous Current | 400A / 630A / 800A | Standard Rating |
| Rated Frequency | 50 Hz | National Standard |
| Rated Active Load Breaking Capacity | Up to 630A at 0.7 power factor | Type Tested |
| Rated Closed Loop Breaking Capacity | 630A at 0.3 p.f. | IEC 60265-1 |
| Rated Short-Circuit Making Capacity | 50 kA peak (12kV) / 31.5 kA peak (36kV) | With Standalone Switch |
| Rated Short-Time Withstand Current | 20 kA / 25 kA for 1 Second / 3 Seconds | IS 9920 |
| Cable-Charging Breaking Current | 10A to 25A | IEC Standard |
| 🔷 Dielectric & Insulation Data | ||
| Power Frequency Withstand Voltage | 28 kV rms (to earth/between poles) / 32 kV across open gap | IS 9920 |
| Lightning Impulse Withstand (BIL) | 75 kVp (to earth) / 85 kVp (isolating distance) | IEC 60071 |
| Insulation Medium | Air insulated with porcelain / epoxy post insulators | High Creepage Class III |
| Clear Isolating Distance | Visible air gap ensuring positive disconnection verification | Safety Feature |
| 🔷 Mechanical & Operational Details | ||
| Operating Mechanism | Manual Handle / Motorized Spring Stored Energy | Snap Action |
| Fuse Base Configuration | Accommodates DIN standard striker pin HRC fuses | 3.3kV to 33kV Fuses |
| Tripping Mechanism | Three-pole simultaneous tripping via striker pin or shunt trip | Single-phasing prevention |
| Integrated Earthing Switch | Quick-make earth switch with mechanical safety interlock | Interlocked with Main Blade |
| Auxiliary Switch | 2NO + 2NC / 4NO + 4NC gold-flashed contacts | Remote Status Feedback |
| Mechanical Operations | Exceeds 1,000 mechanical open/close operations | Class M1 |
| 🔷 Enclosure & Fabrication | ||
| Mounting Style | Indoor Metal-Enclosed Cubicle / Outdoor Kiosk Pole-Mounted | Custom Config |
| Sheet Steel Gauge | 2.0 mm CRCA powder coated to RAL 7032 | Anti-Corrosive |
| Ingress Protection | IP4X (Indoor) / IP54 - IP55 (Outdoor Weatherproof) | IS/IEC 60529 |
Key Engineering & Operational Features
Why electrical consultants, industrial plants, and utility engineers specify MOBY LBS (Load Break Switch).
Quick-Make Quick-Break Operation
Spring-loaded snap mechanism ensures rapid contact closure and opening regardless of the speed or force applied by the operator, eliminating contact arcing.
Integral Earth Switch with Interlock
Built-in earthing switch is mechanically interlocked with the main switch: earth blades cannot close while main contacts are live, and main switch cannot close while earthed.
Striker Pin Automatic Tripping
Equipped with high-rupturing-capacity (HRC) fuses with striker pins. When any single fuse blows, the striker triggers immediate all-phase gang tripping, preventing destructive single-phasing.
Visible Disconnecting Air Break
Provides maintenance engineers with an immediate visual verification of isolated contact separation through viewing window before commencing line maintenance.
Heavy-Duty Weatherproof Option
Outdoor kiosk versions feature sloped roof canopies, stainless steel hardware, neoprene gaskets, and anti-condensation heaters rated for extreme monsoons.
Highly Cost-Effective Protection
Provides reliable HT transformer switching and fault clearance at a fraction of the capital investment of a full vacuum circuit breaker panel.
Certified Quality & Factory Testing Standards
Every LBS (Load Break Switch) 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 LBS (Load Break Switch).
What are the technical voltage and breaking ratings for MOBY LBS (Load Break Switch)? +
Primary Parameter Ratings: MOBY LBS (Load Break Switch) is engineered for rated voltage 6.6 kV / 12 kV / 36 kV and rated normal current 400A / 630A / 800A. 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 LBS (Load Break Switch) CPRI tested and certified? +
Certification & Type Testing: Yes, MOBY LBS (Load Break Switch) is IS 9920 / IEC 60265 Tested. 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 LBS (Load Break Switch)? +
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 LBS (Load Break Switch)
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.