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L&T (Larsen & Toubro) AUI00212500 Main Switch Disconnector

The L&T AUI00212500 is a high-capacity 125A 2-pole switch disconnector engineered for precise manual isolation in 415V electrical circuits. As a cornerstone of the AUI series, this isolator provides a safe physical break in the connection for both phase and neutral lines, featuring a robust thermoplastic housing and an AC-23A utilization category suitable for switching highly inductive loads in demanding residential and light commercial environments.

Quick Answer

This 125A isolator is specifically designed for single-phase plus neutral (1P+N) isolation in distribution boards. It is best used as a main incomer where manual disconnection is required, but it must be paired with an MCB or MCCB for overcurrent protection.

✓High-current 125A rating for heavy-duty electrical isolation requirements.
✓AC-23A utilization category allowing for frequent switching of motor loads.
✓2-Pole (1P+N) configuration ensuring simultaneous disconnection of phase and neutral.
✓Compact DIN Rail mounting compatibility for standard distribution board installation.
✓IP40 rated thermoplastic housing offering superior thermal stability and safety.

Choose the L&T AUI00212500 if you require a high-amperage, 2-pole isolation solution from India's leading switchgear manufacturer. It is the ideal choice for those prioritizing brand reliability, AC-23A switching performance, and space-efficient DIN rail mounting.

✓ Who Should Buy

  • •Electrical contractors installing main incomers for large residential units or commercial villas.
  • •Panel builders looking for a reliable 125A 2-pole isolator that meets Indian utility standards.
  • •Maintenance engineers requiring a high-current manual disconnect for HVAC or pump control panels.

✕ Who Should Avoid

  • •Users looking for automatic protection against short circuits or overloads (this model is an isolator only).
  • •Outdoor installations exposed to direct rain without an additional IP65-rated enclosure.
Product Overview
The Larsen & Toubro AUI00212500 serves as a critical safety component in modern electrical infrastructure. Designed for a 415V rated voltage, this manual toggle-operated switch disconnector provides a reliable 10kA breaking capacity within its functional scope. Its primary role is to ensure that downstream circuits are completely de-energized during maintenance, providing a visible and physical separation that complies with international safety standards for isolation.

BrandL&T (Larsen & Toubro)
Model NameAUI00212500
TypeMain Switch Disconnector
SeriesAUI Series
Housing MaterialThermoplastic
Country Of OriginIndia
Release Year2012

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Engineering Analysis
The internal switching mechanism of the AUI00212500 utilizes a rapid-break contact system to minimize arcing during manual operation. The AC-23A rating is significant, as it confirms the device's ability to handle the inrush currents of inductive loads like air conditioners or small pumps. Unlike basic switches, this unit is tested for endurance under load, ensuring that the manual toggle remains functional over thousands of switching cycles even at its peak 125A capacity.

Technical Support & FAQs