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L&T (Larsen & Toubro) FN-125 TPN

The L&T FN-125 TPN is a high-performance 125A Switch Disconnector from the legendary FN Series, engineered for robust industrial and commercial power management. Featuring a Four-Pole (TPN) configuration and a specialized AC-23A utilization category, this device is purpose-built for the safe isolation of 3-phase circuits and highly inductive motor loads, ensuring maximum operational safety during maintenance.

Quick Answer

The FN-125 TPN is best used as a manual main isolator in 3-phase industrial control panels and commercial distribution boards requiring 125A capacity and positive neutral isolation.

✓Heavy-duty 125A rated current for industrial-scale power distribution.
✓AC-23A Utilization Category specifically rated for switching inductive motor loads.
✓TPN (4-Pole) design ensures simultaneous isolation of all three phases and the neutral.
✓High breaking capacity of 10kA for enhanced system reliability under stress.
✓Durable thermoplastic housing with IP40 protection and DIN rail compatibility.

Choose the L&T FN-125 TPN if you need a reliable, India-specific 125A manual isolator that complies with AC-23A standards for switching motor loads in 3-phase systems.

✓ Who Should Buy

  • •Industrial electrical contractors building 3-phase motor control centers (MCC).
  • •Facility managers of commercial complexes requiring a 125A main line isolator.
  • •Panel builders looking for a space-efficient, DIN-rail mounted TPN switch.

✕ Who Should Avoid

  • •Users requiring automatic trip protection (this model requires external fuses/MCBs for protection).
  • •Residential users with low-current single-phase requirements where a 125A TPN is overkill.
Product Overview
The Larsen & Toubro FN-125 TPN stands as a benchmark in the Indian switchgear market, offering a specialized solution for manual circuit disconnection. As part of the FN Series launched in 2008, it has established a reputation for mechanical longevity and electrical stability. Designed for 415V systems, this switch disconnector provides a visible and secure break in the electrical supply, which is critical for the safety of downstream personnel and equipment. Constructed with high-grade thermoplastic, the FN-125 TPN is optimized for space-saving DIN rail mounting. While it does not provide internal overload or short-circuit protection, its high 10kA breaking capacity and isolation functionality make it the perfect companion for MCCBs or HRC fuses in a coordinated protection scheme.

BrandL&T (Larsen & Toubro)
Model NameFN-125 TPN
TypeMain Switch Disconnector
SeriesFN Series
Housing MaterialThermoplastic
Country Of OriginIndia
Release Year2008

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Engineering Analysis
The FN-125 TPN features a specialized four-pole architecture that addresses the risks of 'floating neutral' by ensuring the neutral line is disconnected in tandem with the phases. Its terminal design utilizes heavy-duty screw connectors capable of securing the large-gauge copper or aluminum cabling required for 125A loads. The IP40 rated thermoplastic enclosure provides sufficient protection against solid objects, making it ideal for integration within secondary distribution panels.

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