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L&T (Larsen & Toubro) AUI00210000

The L&T AUI00210000 is a high-performance 100A 2-pole Main Switch Disconnector from the prestigious AUI Series, engineered specifically for high-capacity electrical isolation in industrial and heavy-duty residential panels. Designed for 415V AC applications, this device excels in providing a safe, visible physical break in the circuit, catering to systems that require a robust 1-phase + Neutral configuration without the bulk of traditional heavy-duty switchgear.

Quick Answer

The L&T AUI00210000 is best used as a primary master isolator for single-phase distribution boards requiring 100A capacity and high-duty AC-23A switching performance.

✓100A High-Current Rated Capacity
✓AC-23A Utilization Category for Inductive Loads
✓2-Pole (1P+N) Configuration for Comprehensive Isolation
✓Compact DIN Rail Mounting Design
✓Durable IP40-Rated Thermoplastic Housing

The L&T AUI00210000 is the definitive choice for professionals who require a dedicated 100A isolation point that is space-efficient and compatible with standard DIN rail architecture. Its AC-23A rating makes it more durable than standard isolators for heavy-duty cycles.

✓ Who Should Buy

  • •Industrial electrical contractors installing main sub-panels.
  • •Residential owners with heavy loads (central AC, EV chargers) needing a master disconnect.
  • •Panel builders looking for a compact, high-ampere 2-pole DIN rail solution.

✕ Who Should Avoid

  • •Users requiring automatic short-circuit or overload protection (requires an MCB/MCCB instead).
  • •3-Phase industrial applications requiring 3-pole or 4-pole switching.
Product Overview
The L&T AUI00210000 stands as a cornerstone for safe electrical maintenance, offering a manual toggle operation that ensures positive contact indication. As part of the AUI series, it is housed in a high-grade thermoplastic material that offers excellent thermal stability and impact resistance. Its 10kA breaking capacity ensures it can handle the thermal and mechanical stresses of high-current environments effectively. Technically refined for the Indian market, this 100A disconnector is optimized for DIN rail environments, allowing for seamless integration into modern modular distribution boxes. While it functions purely as an isolator (lacking internal trip mechanisms for short circuits), its role is vital in ensuring that downstream maintenance can be performed with zero voltage risk, making it an essential component for both industrial sub-panels and large-scale residential mains.

BrandL&T (Larsen & Toubro)
Model NameAUI00210000
TypeMain Switch Disconnector
SeriesAUI Series
Housing MaterialThermoplastic
Country Of OriginIndia
Release Year2012

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Engineering Analysis
From a technical perspective, the AUI00210000 utilizes a silver-alloy contact system that reduces arcing and increases the mechanical lifespan of the manual toggle. The screw terminal design is widened to accept large cross-section copper or aluminum cables necessary for 100A throughput. The lack of overload protection is a deliberate design choice, allowing this unit to function as a 'point-of-entry' switch that remains resilient even when downstream breakers are pushed to their limits.

Technical Support & FAQs